CN112294990A - Plasma sterilization disinfection cabinet and disinfection method - Google Patents
Plasma sterilization disinfection cabinet and disinfection method Download PDFInfo
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- CN112294990A CN112294990A CN201910703952.2A CN201910703952A CN112294990A CN 112294990 A CN112294990 A CN 112294990A CN 201910703952 A CN201910703952 A CN 201910703952A CN 112294990 A CN112294990 A CN 112294990A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/02—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using physical phenomena
- A61L2/14—Plasma, i.e. ionised gases
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/26—Accessories or devices or components used for biocidal treatment
-
- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
- A61L2202/10—Apparatus features
- A61L2202/11—Apparatus for generating biocidal substances, e.g. vaporisers, UV lamps
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2202/00—Aspects relating to methods or apparatus for disinfecting or sterilising materials or objects
- A61L2202/10—Apparatus features
- A61L2202/13—Biocide decomposition means, e.g. catalysts, sorbents
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- Engineering & Computer Science (AREA)
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- Veterinary Medicine (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a plasma sterilization disinfection cabinet and a disinfection method, wherein the disinfection cabinet comprises a plasma generation module and a power supply module, the plasma generation module comprises an air chamber, a discharge assembly and a fan are arranged in the air chamber, an air inlet and an air outlet which can be opened and closed are arranged on the side wall of the air chamber, the air outlet is communicated with a sterilization space in a cabinet body, and the air outlet direction of the fan faces towards the air outlet. The power module provides a high voltage power supply to the discharge assembly. When the plasma generating module is in an initial discharge stage, the gas chamber is closed, the discharge assembly generates plasma, and after a period of time, the ozone concentration of the plasma in the gas chamber is reduced and stabilized; then entering a stable discharging stage, starting the fan, opening the air inlet and the air outlet, enabling the plasma with low ozone concentration in the air chamber to enter a sterilizing space for sterilization, and simultaneously enabling new air to enter the air chamber for discharging to generate new plasma. The disinfection cabinet can input plasma with low ozone concentration into a disinfection space to realize disinfection.
Description
Technical Field
The invention relates to the technical field of disinfection cabinets, in particular to a plasma sterilization disinfection cabinet and a disinfection method.
Background
At present, disinfection cabinets generally adopt ultraviolet rays, high temperature, ozone and other modes for sterilization and disinfection. The ultraviolet disinfection range is limited and the disinfection is not thorough. High-temperature disinfection energy consumption is high, and some plastic kitchen utensils which do not resist high temperature cannot be disinfected at high temperature. Although ozone has a remarkable sterilizing effect, ozone itself has a strong pungent smell and also has a certain toxicity. Excessive ozone can strongly stimulate the respiratory tract of a human body, cause symptoms such as sore throat, chest distress, cough and the like, and possibly cause bronchitis and emphysema; the long-term work in the high-concentration ozone environment can cause people to suffer from nerve poisoning, dizziness, headache, visual deterioration and memory deterioration.
Plasma sterilization has been applied in the fields of medical use and the like, and the modes for generating plasma mainly include dielectric barrier discharge and corona discharge, and discharge devices of the plasma include DBD, Glow, Spark, Propelleter Arc and the like. The plasma technology can realize excellent sterilization effect, and the principle comprises three parts: active particle radical oxidation, high-speed particle breakdown, and ultraviolet photons. The sterilization process does not need high temperature, and meanwhile, the active particles can be rapidly diffused to a sterilization space in a gaseous state, so that dead-angle-free sterilization is realized. However, the main reason for limiting the use of plasma technology is the associated generation of large amounts of ozone during plasma discharge. The irritating odor and toxicity of ozone limit the use of plasma technology in daily life.
To control the ozone concentration, three methods are mostly adopted at present: shortening the plasma discharge time, increasing the ambient temperature and adding a catalyst to promote ozone decomposition.
The ozone concentration is reduced by shortening the plasma discharge time, so that long-period intermittent work is often formed, for example, the mode of discharging for 1min and resting for 30min in a refrigerator is adopted, and the circulation mode is adopted. Although the mode can realize the sterilization effect, the long-time standby mode can bring the improvement of the power consumption, and the mode is not suitable for other electric appliances which are discontinuously supplied with power, such as washing machines, disinfection cabinets, water heaters, air conditioners and the like.
The ozone concentration is reduced by adopting a mode of improving the environmental temperature, so that on one hand, the power consumption is improved, and on the other hand, the period is prolonged and the working efficiency is reduced due to slow ozone decomposition. And is also not suitable for household appliances working at low temperature or normal temperature, such as refrigerators, washing machines and the like.
The mode of adding the catalyst is adopted to promote the ozone decomposition, so that the phenomena of low efficiency, easy inactivation of the catalyst and the like exist, and the concentration of ozone is unstable and is easy to exceed the standard.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present invention provides a plasma sterilization and disinfection cabinet, which can achieve efficient sterilization without dead angle by using plasma and can reduce ozone concentration.
In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:
a plasma sterilization and disinfection cabinet comprises a cabinet body, wherein a sterilization space is formed inside the cabinet body, and the plasma sterilization and disinfection cabinet further comprises: the plasma generating module comprises a gas chamber, a discharging assembly and a fan, wherein the discharging assembly and the fan are arranged in the gas chamber, an air inlet and an air outlet which can be opened and closed are formed in the side wall of the gas chamber, the air outlet is communicated with the sterilizing space, and the air outlet direction of the fan faces to the air outlet; a power module providing a high voltage power to the discharge assembly.
In order to realize the drying of the articles to be sterilized and further reduce the concentration of ozone, the sterilizing cabinet also comprises a main heating module which is used for drying the articles to be sterilized in the sterilizing space and decomposing the ozone in the sterilizing space.
As a preferred embodiment, the heating temperature of the main heating module is 30-80 ℃.
As a preferred embodiment, the main heating module is operated simultaneously with the plasma generating module in order to improve the sterilization efficiency.
In order to further reduce the concentration of ozone, an auxiliary heating module is arranged in the gas chamber and used for decomposing the ozone in the gas chamber.
In order to realize the opening and closing of the air inlet and the air outlet, a first blocking piece capable of opening and closing is arranged on the air inlet, and a second blocking piece capable of opening and closing is arranged on the air outlet.
In order to generate uniform plasma and reduce the concentration of ozone, the discharge assembly comprises a high-voltage electrode, a ground electrode and a dielectric layer, wherein the dielectric layer is arranged between the high-voltage electrode and the ground electrode; the discharge power density of the discharge assembly is more than 0.17W/cm2。
Also in order to generate uniform plasma and reduce the concentration of ozone, the high-voltage electrode is connected with the power supply module, and the high-voltage power supply provided by the power supply module comprises a sinusoidal high-voltage power supply and a pulse high-voltage power supply.
In order to further reduce the concentration of ozone, the air flow speed blown out by the fan is 0.8L/min-5L/min.
The invention also provides a disinfection method of the plasma disinfection cabinet, wherein the plasma generation module comprises an initial discharge stage and a stable discharge stage; when the plasma generating module is in the initial discharge stage, the fan is closed, the air inlet and the air outlet are closed, and the discharge assembly discharges to generate plasma; when the plasma generation module is in the stable discharge stage, the fan is started, the air inlet and the air outlet are opened, the plasma in the air chamber enters the sterilization space through the air outlet, and the outside air enters the air chamber through the air inlet.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention provides a plasma sterilization and disinfection cabinet and a sterilization method. The plasma generating module comprises an air chamber, a discharging assembly and a fan are arranged in the air chamber, an air inlet and an air outlet which can be opened and closed are formed in the side wall of the air chamber, the air outlet is communicated with the sterilization space in the cabinet body, and the air outlet direction of the fan faces towards the air outlet. The power supply module provides a high-voltage power supply for the discharge assembly, so that the discharge assembly generates plasma. The plasma generating module comprises an initial discharge stage and a stable discharge stage, wherein in the initial discharge stage, the gas chamber is closed, the discharge assembly generates plasma under the action of the power supply module, and after the initial discharge stage works for a period of time, the ozone concentration of the plasma in the gas chamber is reduced and stabilized; and then entering a stable discharging stage, wherein the fan is started, the air inlet and the air outlet are opened, the plasma with low ozone concentration in the air chamber enters the sterilizing space for sterilization, and simultaneously new air enters the air chamber for discharging to generate new plasma. The disinfection cabinet realizes sterilization by inputting plasma with low ozone concentration into the sterilization space, and can avoid adverse effects caused by ozone.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of the sterilizer of the present invention;
FIG. 2 is a schematic diagram of the structure of an embodiment of the disinfection cabinet of the present invention;
FIG. 3 is a first schematic structural diagram of a plasma generation module according to an embodiment of the present invention;
FIG. 4 is a second schematic structural diagram of a plasma generation module according to an embodiment of the present invention;
FIG. 5 is a graph showing the ozone concentration of the embodiment of the disinfection cabinet of the present invention in a first mode of operation;
FIG. 6 is a graph showing the ozone concentration in a second mode of operation of the disinfection cabinet according to the embodiment of the present invention;
FIG. 7 is a graph showing the relationship between the discharge power and the ozone concentration in the disinfection cabinet according to the embodiment of the present invention;
FIG. 8 is a schematic diagram showing the relationship between the gas flow rate and the ozone concentration in the disinfection cabinet according to the embodiment of the present invention.
The plasma generator comprises a plasma generating module 100, a discharge assembly 110, a high-voltage electrode 111, a dielectric layer 112, a ground electrode 113, a gas chamber 120, an air inlet 121, an air outlet 122, a first baffle plate 123, a second baffle plate 124, a fan 130, an upper pressing plate 140, an upper through hole 141, a lower pressing plate 150, a lower through hole 151, a power supply module 200, a cabinet 300, a sterilizing space 310 and a main heating module 400.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention discloses a plasma sterilization and disinfection cabinet, which is shown in figures 1 to 4, wherein figure 1 is a schematic diagram of the disinfection cabinet, figure 2 is a schematic diagram of the disinfection cabinet, figure 3 is a schematic diagram of the structure of a gas chamber of a plasma generation module in a closed state, and figure 4 is a schematic diagram of the structure of the gas chamber of the plasma generation module in an open state. The sterilizing cabinet comprises a cabinet body 300, a sterilizing space 310 is formed inside the cabinet body 300, and articles to be sterilized are placed in the sterilizing space 310 for sterilization. The disinfection cabinet further comprises a plasma generation module 100 and a power supply module 200, the plasma generation module 100 comprises a gas chamber 120, a hollow cavity is formed in the gas chamber 120, a discharge assembly 110 and a fan 130 are arranged in the hollow cavity, an openable gas inlet 121 and an openable gas outlet 122 are arranged on the side wall of the gas chamber 120, the gas outlet 122 is communicated with the sterilization space 310, and the air outlet direction of the fan 130 faces the gas outlet 122. The power module 200 provides high voltage power to the discharge assembly 110, so that the discharge assembly 110 generates plasma.
The plasma generating module 100 comprises an initial discharge stage and a stable discharge stage, wherein in the initial discharge stage, the electric fan 130 is turned off, the air inlet 121 and the air outlet 122 are turned off, the air chamber 120 is closed, the discharge assembly 110 generates plasma under the action of the power supply module 200, and after the initial discharge stage works for a period of time, the ozone concentration of the plasma in the air chamber 120 is reduced and stabilized; then, the plasma generation module 110 enters a stable discharge stage, at this time, the fan 130 is turned on, the air inlet 121 and the air outlet 122 are opened, the plasma with low ozone concentration in the air chamber 120 enters the sterilization space 310 through the air outlet 122 for sterilization, and meanwhile, new outside air enters the air chamber 120 through the air inlet 121 for discharge to generate new plasma; and circulating in such a way, and finally finishing the disinfection target.
The plasma generated by the plasma generating module 100 is not directly input into the sterilization space 310, but is input into the sterilization space 310 for sterilization after the plasma inside the gas chamber 120 is stabilized after reacting for a period of time, such as 1-5min, inside the closed gas chamber 120. The reason for this is that ozone and other active molecules are present in the plasma generated by the discharge unit 110 during the initial stage of discharge, and if the plasma containing ozone is directly inputted into the sterilization space 310 for sterilization, the odor and toxicity of ozone may adversely affect the user. And these ozone and active molecule are extremely unstable in the initial stage of discharging, ozone and other active molecules will react, then, will discharge plasma containing certain ozone and active molecule produced in the initial stage and react in the closed air chamber 120 for a period of time, ozone and other active molecules will react each other in the air chamber to reduce the ozone concentration, then, will enter the plasma with low ozone concentration into the sterilization space 310 to sterilize, realize the sterilization of all-round, no dead angle, and avoided the bad influence that the ozone brings. The plasma generating module 100 utilizes the unstable characteristic of the plasma generated by the discharge assembly 110 in the initial stage of discharge, provides a reaction space for the unstable plasma by using the closed gas chamber 120, and inputs the plasma into the sterilization space 310 for sterilization after the ozone concentration is reduced after the reaction.
Further, the discharge assembly 110 adopts a dielectric barrier discharge form in the prior art, referring to fig. 3 and 4, the discharge assembly 110 includes a high voltage electrode 111, a ground electrode 113 and a dielectric layer 112, and the dielectric layer 112 is disposed between the high voltage electrode 111 and the ground electrode 113; the discharge power density of the discharge assembly 110 is greater than 0.17W/cm2. The discharge power density is increased by increasing the discharge power of the discharge assembly 110 and reducing the discharge area. The increase of the discharge power density contributes to the reduction of the ozone concentration. FIG. 7 is a graph showing the relationship between discharge power and ozone concentration, and it can be seen from the graph that the larger the discharge power density is, the lower the ozone concentration is.
Further, the high voltage electrode 111 and the ground electrode 113 are connected to the power module 200, and the high voltage power supplied by the power module 200 includes a sinusoidal high voltage power and a pulse high voltage power. Specifically, in this embodiment, the frequency of the sinusoidal high voltage power supply is 50Hz to 100MHz, the voltage amplitude is 1kV to 20kV, and the frequency of the pulsed high voltage power supply is lower than 100 kHz. The high voltage power supply thus provided helps to produce a uniform, low ozone concentration plasma.
When the plasma generating module 100 is in the stable discharging stage, the plasma in the gas chamber 120 enters the sterilizing space 310 through the air outlet 122 under the blowing action of the fan 130. The air flow speed blown by the fan 130 is preferably 0.8L/min to 5L/min. The reason for this is that the active component in the plasma changes with the change in the gas flow rate, and it is found through a large number of experiments that the ozone concentration decreases with the decrease in the gas flow rate in this example. Fig. 8 shows the relationship between the gas flow rate and the ozone concentration measured in three different time periods, and it can be seen from fig. 8 that the ozone concentration increases as the gas flow rate increases and decreases as the gas flow rate decreases, so that in order to decrease the ozone concentration, the gas flow rate needs to be controlled within a lower range interval. By reasonably controlling the rotation speed of the fan 130, the flow rate of the gas blown out by the fan can not only input the plasma into the sterilization space 310, but also help to reduce the ozone concentration.
Further, an auxiliary heating module (not shown) for decomposing ozone in the gas chamber 120 to further reduce the concentration of ozone is provided in the gas chamber 120. The invention is not limited in particular by the specific structural form of the auxiliary heating module, such as PTC hot air, heating sheet and the like. The heating temperature of the auxiliary heating module is preferably not lower than 60 ℃ so as to ensure that the ozone can be effectively decomposed and the ozone concentration can be reduced.
The cabinet also comprises a main heating module 400 which serves the purpose of drying the goods to be sterilised in the sterilisation space 310 on the one hand and of decomposing the small amount of ozone present in the sterilisation space on the other hand. Wherein, the drying function is mainly, and the ozone decomposition function is auxiliary. The specific structural form of the main heating module 400 is not particularly limited in the present invention, and for example, PTC hot air, a heating sheet, etc. are used.
The heating temperature of the main heating module 400 is 30 to 80 deg.c, preferably 60 deg.c. The main heating module 400 within the temperature range can dry the articles to be sterilized and decompose ozone.
The main heating module 400 operates simultaneously with the plasma generating module 100, that is, the main heating module 400 simultaneously dries and decomposes ozone, contributing to shortening the sterilization time and providing sterilization efficiency. In the existing disinfection cabinet, for example, an ozone disinfection cabinet, two processes of drying and decomposing ozone by heating are separately operated, a large amount of ozone enters the sterilization space 310 and then is sterilized by ozone, after the sterilization is completed, the heating module 400 is started again to decompose the ozone, and after the ozone decomposition is completed, the heating module 400 is heated again to realize drying. The processes of sterilization, ozone decomposition and drying are completed independently, so that the sterilization time of the disinfection cabinet is greatly prolonged, and the efficiency is lower. In the embodiment, before the plasma enters the sterilization space 310, the concentration of ozone contained in the plasma generated by the plasma generation module 100 is already low, so that the plasma entering the sterilization space 310 can meet the use requirement even without ozone decomposition operation. The main heating module 400 can decompose a small amount of ozone which is still stored when drying operation is carried out, so that the ozone concentration is further reduced, and the use performance of the disinfection cabinet is improved.
The plasma generation module 100 is described in detail below.
The discharge assembly 110 is sandwiched between the upper platen 140 and the lower platen 150, and the upper platen 140, the high voltage electrode 111, the dielectric layer 112, the ground electrode 113 and the lower platen 150 are sequentially attached from top to bottom. The upper pressing sheet 140 is provided with an upper through hole 141 for dissipating heat of the high voltage electrode 111. The lower platen 150 is provided with a lower through hole 151, the lower through hole 151 is communicated with the inside of the gas chamber 120, and the plasma generated by the discharge assembly 110 enters the inside of the gas chamber 120 through the lower through hole 151. The high voltage electrode 111 may be selected from the metals aluminum, copper, iron, platinum or alloys thereof, preferably copper, stainless steel. The ground electrode may be selected from a sheet, a wire, a mesh, a spiral, or a hybrid type, and preferably is a mesh. Dielectric layer 112 may be an insulating layer of glass, ceramic, plastic, or rubber, preferably ceramic. The air chamber 120 is sealed with the lower pressing plate 150, the material of the air chamber 120 may be selected from glass, ceramic, plastic and other insulators, and for the convenience of observation, the air chamber 120 is preferably transparent, and the shape of the air chamber 120 may be designed as required.
The air inlet 121 is provided with a first stopper 123 capable of opening and closing, and the air outlet 122 is provided with a second stopper 124 capable of opening and closing. After the fan 130 is turned on, the airflow blown by the fan 130 blows the second shutter 124, so that the second shutter 124 is opened to open the air outlet 122, the plasma inside the gas chamber 120 flows out through the air outlet 122, the pressure inside the gas chamber 120 changes, and the first shutter 123 is also opened to open the air inlet 121. In the present embodiment, the first stopper 123 and the second stopper 124 are preferably self-hanging louvers or films, fibers, sheets, or the like having self-hanging properties.
The air introduced into the inside of the plenum 120 through the air inlet 121 may be air from outside the sterilizing cabinet or air from inside the sterilizing space 310 depending on the installation position of the plasma generating module 100. When the plasma generation module 100 is installed outside the cabinet 300, the air inlet 121 communicates with the outside air of the sterilizing cabinet, the outside air is introduced, and the air outlet 122 communicates with the sterilizing space 310. When the plasma generating module 100 is installed inside the sterilizing space 310, the air inlet 121 communicates with the air inside the sterilizing space 310, the inside air is introduced, and the air outlet 122 communicates with the sterilizing space 310.
The disinfection cabinet has two working modes, wherein the first mode is intermittent discharge, and the second mode is continuous discharge.
When the first intermittent discharge is adopted, the specific working mode adopted by the embodiment is to work for 10min and stop for 5min, and two cycles are performed to complete one disinfection task of the disinfection cabinet, that is, the total disinfection time of the disinfection cabinet is 30 min. After the disinfection cabinet starts a disinfection task, the power supply module 200 starts to supply power to the plasma generation module 100, the plasma generation module 100 firstly enters an initial discharge stage, works for 1-5min, preferably 2min, the plasma generation module 100 enters a stable discharge stage, the plasma in the air chamber 120 enters the sterilization space 310 for sterilization, new air enters the air chamber 120 for discharging to generate new plasma, and when the total discharge of the plasma generation module 100 reaches 10min, the power supply module 200 stops supplying power to the discharge assembly 110, so that the discharge assembly 110 is prevented from continuously discharging to damage components, and the discharge of the first period is completed. After the discharging assembly 110 stops for 5min, the power module 200 supplies power to the discharging assembly 110 again, and the work flow of the first period is repeated. When the discharge of two cycles is completed, the disinfection of the disinfection cabinet is completed. The main heating module 400 and the auxiliary heating module are in operation during the entire sterilization process. FIG. 5 is a graph showing the ozone concentration measured in the first mode of operation of the disinfection cabinet according to the embodiment of the present invention.
When the second continuous discharging mode is adopted, the specific working mode adopted in the embodiment is to work for 10min and stop for 10min, and the disinfection task of the disinfection cabinet can be completed by discharging in one cycle, that is, the total disinfection time of the disinfection cabinet is 20 min. After the disinfection cabinet starts a disinfection task, the power supply module 200 starts to supply power to the discharge assembly 110, the plasma generation module 100 firstly enters an initial discharge stage, works for 1-5min, preferably 2min, the plasma generation module 100 enters a stable discharge stage, the plasma in the air chamber 120 enters the sterilization space 310 for sterilization, meanwhile, new air enters the air chamber 120 for discharging to generate new plasma, and when the total discharge of the plasma generation module 100 reaches 10min, the power supply module 200 stops supplying power to the discharge assembly 110, so that the discharge assembly 110 is prevented from continuously discharging to damage components. Then, after the discharging assembly 110 is stopped for 10min, the purpose of this stage is mainly to decompose the ozone still existing in the sterilizing space 310, further reduce the ozone concentration, and complete the sterilizing task of the sterilizing cabinet. The main heating module 400 and the auxiliary heating module are in operation during the entire sterilization process. FIG. 6 shows the measured ozone concentration curve of the disinfection cabinet of the above embodiment in the second operation mode.
As can be seen from the figures 5 and 6, the ozone content in the plasma generated by the disinfection cabinet is very low, so that the plasma can be sterilized in all directions without dead angles, the adverse effect caused by ozone can be avoided, the disinfection time of the disinfection cabinet can be shortened, and the disinfection efficiency is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a plasma sterilizer, includes the cabinet body, the internal portion of cabinet forms the sterilization space, its characterized in that still includes:
the plasma generating module comprises a gas chamber, a discharging assembly and a fan, wherein the discharging assembly and the fan are arranged in the gas chamber, an air inlet and an air outlet which can be opened and closed are formed in the side wall of the gas chamber, the air outlet is communicated with the sterilizing space, and the air outlet direction of the fan faces to the air outlet;
a power module providing a high voltage power to the discharge assembly.
2. A plasma sterilisation and disinfection cabinet according to claim 1, further comprising:
a main heating module for drying the articles to be sterilized in the sterilizing space and decomposing ozone in the sterilizing space.
3. A plasma sterilisation and disinfection cabinet according to claim 2,
the heating temperature of the main heating module is 30-80 ℃.
4. A plasma sterilisation and disinfection cabinet according to claim 2,
the main heating module and the plasma generating module work simultaneously.
5. A plasma sterilisation and disinfection cabinet according to claim 1,
an auxiliary heating module is arranged in the gas chamber and used for decomposing ozone in the gas chamber.
6. A plasma sterilisation and disinfection cabinet according to claim 1,
the air inlet is provided with a first blocking piece capable of being opened and closed, and the air outlet is provided with a second blocking piece capable of being opened and closed.
7. A plasma sterilisation and disinfection cabinet according to claim 1,
the discharge assembly comprises a high-voltage electrode, a ground electrode and a dielectric layer, and the dielectric layer is arranged between the high-voltage electrode and the ground electrode;
the discharge power density of the discharge assembly is more than 0.17W/cm2。
8. A plasma sterilisation and disinfection cabinet according to claim 7,
the high-voltage electrode is connected with the power supply module, and the high-voltage power supply provided by the power supply module comprises a sine high-voltage power supply and a pulse high-voltage power supply.
9. A plasma sterilisation and disinfection cabinet according to any of the claims 1-8,
the air flow speed blown out by the fan is 0.8-5L/min.
10. A method of sterilising a plasma sterilisation cabinet according to any of the claims 1-9,
the plasma generation module comprises an initial discharge stage and a stable discharge stage;
when the plasma generating module is in the initial discharge stage, the fan is closed, the air inlet and the air outlet are closed, and the discharge assembly discharges to generate plasma;
when the plasma generation module is in the stable discharge stage, the fan is started, the air inlet and the air outlet are opened, the plasma in the air chamber enters the sterilization space through the air outlet, and the outside air enters the air chamber through the air inlet.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114688686A (en) * | 2021-11-26 | 2022-07-01 | 海信（山东）空调有限公司 | Method and device for controlling ultraviolet sterilization of air conditioner, air conditioner and storage medium |
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Application publication date: 20210202 |