CN210932886U

CN210932886U - Plasma sterilization and disinfection cabinet

Info

Publication number: CN210932886U
Application number: CN201921226871.XU
Authority: CN
Inventors: 李小娇; 董玮利; 李超; 李枫; 马少云; 王涛; 刘定新; 郗旺
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-07-07
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a plasma sterilization and disinfection cabinet, which comprises a plasma generation module, a power module, an airflow module and a catalyst module. The plasma generating module comprises a gas chamber, wherein a discharging assembly is arranged in the gas chamber, and the gas chamber is provided with a gas outlet and a gas inlet. The power module provides a high-voltage power supply for the discharge assembly, the airflow module conveys plasma in the air chamber into the sterilization space, and the catalyst module is arranged in the air chamber or on the airflow module and used for decomposing ozone. The plasma generation module comprises an initial discharge stage and a stable discharge stage, wherein in the initial discharge stage, the gas chamber is closed, and in the stable discharge stage, the gas chamber is opened. The catalyst module carries out catalytic decomposition on ozone existing in the plasma before the plasma enters the sterilization space, so that the ozone concentration is reduced, and the sterilization rate is improved. The disinfection cabinet can input plasma with low ozone concentration into a disinfection space to realize disinfection.

Description

Plasma sterilization and disinfection cabinet

Technical Field

The utility model relates to a sterilizer technical field especially relates to a plasma sterilization sterilizer.

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, two methods are mostly adopted at present: shortening the plasma discharge time and increasing the ambient temperature promotes 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 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 this, the utility model provides a plasma sterilization and disinfection cabinet, it is when realizing no dead angle, high-efficient sterilization through plasma, also can reduce ozone concentration.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

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 and a discharging assembly arranged in the gas chamber, wherein the side wall of the gas chamber is provided with a gas outlet and a gas inlet which can be opened and closed; the gas flow module is communicated with the gas outlet through a pipeline and is used for conveying the plasma in the gas chamber into the sterilization space; a power module providing a high voltage power to the discharge assembly; and the catalyst module is arranged in the air chamber or on the air flow module and is used for decomposing ozone.

In order to realize the stoving of the article of waiting to disinfect and further reduce ozone concentration, the sterilizer still includes: a main heating module for drying the articles to be sterilized in the sterilizing space and decomposing ozone in the sterilizing space.

As a preferred embodiment, the main heating module is operated simultaneously with the plasma generating module in order to improve the sterilization efficiency.

As a preferred embodiment, the air flow module includes an air outlet conduit and an air pump, the air pump is communicated with the air outlet through the pipeline, and the air outlet conduit is communicated with the sterilization space.

In order to further reduce the concentration of ozone, the flow rate of the gas output by the gas flow module is 0.8-5L/min.

In a preferred embodiment, the air inlet is communicated with an air inlet duct, and the air inlet duct is communicated with the sterilization space or the external atmosphere.

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.

As a preferred embodiment, the discharge assembly includes a high voltage electrode, a ground electrode, and a dielectric layer, and the dielectric layer is disposed between the high voltage electrode and the ground electrode; the discharge power density of the discharge assembly is more than 0.17W/cm²。

In a preferred embodiment, the high voltage electrode is connected to the power module, and the high voltage power supplied by the power module includes a sinusoidal high voltage power and a pulse high voltage power.

Compared with the prior art, the utility model discloses an advantage is with positive effect:

the utility model provides a plasma sterilization and disinfection cabinet, through the synergism of plasma production module, air current module and catalyst module, reduce ozone concentration, improve sterilization efficiency.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read 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 described 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 inventive labor.

FIG. 1 is a schematic view of an embodiment of the disinfection cabinet of the present invention;

FIG. 2 is a schematic structural view of an embodiment of the disinfection cabinet of the present invention;

fig. 3 is a schematic structural diagram of an embodiment of the plasma generation module of the present invention;

FIG. 4 is a schematic diagram showing the relationship between the discharge power and the ozone concentration of the embodiment of the disinfection cabinet of the present invention;

FIG. 5 is a schematic view showing the relationship between the flow rate of gas and the concentration of ozone in the embodiment of the disinfection cabinet of the present invention.

The plasma sterilization device comprises a plasma generation module 100, a discharge assembly 110, a high-voltage electrode 111, a dielectric layer 112, a ground electrode 113, an air chamber 120, an air inlet 121, an air outlet 122, an air inlet guide pipe 130, an upper pressing plate 140, an upper through hole 141, a lower pressing plate 150, a lower through hole 151, a stopper 160, a power supply module 200, a cabinet 300, a sterilization space 310, a main heating module 400, an air flow module 500, an air pump 510, an air pump 520, an air outlet guide pipe 600 and a catalyst module.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 utility model discloses a plasma sterilization and disinfection cabinet, refer to fig. 1 to 3, fig. 1 is the schematic diagram of the principle of disinfection cabinet, fig. 2 is the schematic diagram of the structure of disinfection cabinet, fig. 3 is the schematic diagram of the structure of plasma generation module. 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 plasma sterilization and disinfection cabinet comprises a plasma generation module 100, a power supply module 200, an airflow module 500 and a catalyst module 600. The plasma generating module 100 includes a gas chamber 120, a discharge assembly 110 is disposed in the gas chamber 120, and an air outlet 122 and an openable and closable air inlet 121 are disposed on a sidewall of the gas chamber 120. The power module 200 provides high voltage power to the discharge assembly 110, so that the discharge assembly 110 generates plasma. The gas flow module 500 is communicated with the gas outlet 122 through a pipeline for conveying the plasma in the gas chamber 120 into the sterilization space 310. The catalyst module 600 is provided in the gas chamber 120 or on the airflow module 500 for decomposing ozone.

The plasma generating module 100 comprises an initial discharge stage and a stable discharge stage, wherein in the initial discharge stage, the airflow module 500 is closed, the air outlet 122 is closed, the air chamber 120 is closed, the discharge assembly 110 generates plasma under the action of the power 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 generating module 100 enters a stable discharging stage, at this time, the airflow module 500 is turned on, the air inlet 121 is opened, the plasma with low ozone concentration in the air chamber 120 enters the sterilizing space 310 for sterilization, and meanwhile, new air enters the air chamber 120 for discharging to generate new plasma. The plasma passes through the catalyst module 600 before entering the sterilization space 310, and a small amount of ozone still existing in the plasma is decomposed under the action of the catalyst module 600 and then enters the sterilization space.

The catalyst module 600 is preferably a manganese oxide compound.

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 the plasma containing certain ozone and active molecule produced in the initial stage and react in the closed gas chamber 120 for a period of time, ozone and other active molecules will react each other in the gas chamber 120 and reduce the ozone concentration, then, will enter the plasma with low ozone concentration into the sterilization space 310 and 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, 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. 4 is a graph showing the relationship between the discharge power and the concentration of ozone, and it can be seen from the graph that the larger the discharge power density is, the lower the concentration of ozone 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.

In a preferred embodiment, the airflow module 500 includes an air outlet duct 520 and an air pump 510, the air pump 510 is connected to the air outlet 122 via a pipeline, and the end of the air outlet duct 520 is connected to the sterilization space 310. 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 duct 520 under the action of the air pump 510.

Further, the flow rate of the gas output by the gas flow module 500 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. 5 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. 5 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 air pump 510, the flow rate of the air blown out by the air pump can not only input the plasma into the sterilization space 310, but also help to reduce the ozone concentration.

In other embodiments, the airflow module 500 may also be a fan disposed at the air outlet 122, the air outlet is communicated with the sterilization space 310, and the plasma in the plenum 120 enters the sterilization space 310 under the blowing action of the fan.

In this embodiment, the catalyst module 600 is disposed on the outlet duct 520.

Further, an auxiliary heating module (not shown) for decomposing ozone in the gas chamber to further reduce the concentration of ozone is provided in the gas chamber 120. The utility model discloses do not do specific restriction to the concrete structural style of auxiliary heating module, if adopt forms such as PTC is hot-blast, heating plate. 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 on the one hand and of decomposing a small amount of ozone present in the sterilisation space 310 on the other hand. Wherein, the drying function is mainly, and the ozone decomposition function is auxiliary. The specific structure form of the main heating module 400 is not limited in the present invention, and the PTC heater is hot air or heating plate.

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. And among the current sterilizer, for example ozone sterilizer, two processes of drying and decomposing ozone through the heating are the separate operation, and a large amount of ozone gets into in the sterilization space 310 back, utilizes ozone to disinfect earlier, and after the completion of disinfecting, restart heating module decomposes ozone, treat that ozone decomposes the completion back, and heating module continues to heat up again and realizes 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 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 communicated with an air inlet conduit 130, and the air inlet conduit 130 is communicated with the sterilization space 310 or the external atmosphere. The gas inlet 121 is further provided with an openable stopper 160, after the gas flow module 500 is opened, the plasma inside the gas chamber 120 flows out through the gas outlet 122, at this time, the pressure inside the gas chamber 120 changes, the stopper 160 is also opened to open the gas inlet 121, and the air in the sterilization space 310 or the external atmosphere enters the gas chamber 120 through the gas inlet conduit 130. The stopper 160 is preferably a self-hanging louver or self-hanging film, fabric, sheet, or the like.

The air introduced into the interior of the air chamber 120 through the air inlet 121 may be either air from outside the sterilizing cabinet or air from within the sterilizing space, depending on the installation position of the air intake duct 130. When the end of the air intake duct 130 is installed outside the cabinet 300, the air intake duct 130 communicates with the outside air of the sterilizing cabinet, and introduces the outside air. When the end of the air introduction duct 130 is installed inside the sterilizing space 310, the air introduction duct 130 communicates with the air inside the sterilizing space 310, and introduces the inside air.

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.

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 110 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 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 discharge assembly 110 is stopped for 10min, the purpose of this stage is mainly to decompose the ozone still existing in the sterilization space, further reduce the ozone concentration, and complete the sterilization task of the sterilization cabinet. The main heating module 400 and the auxiliary heating module are in operation during the entire sterilization process.

The ozone content in the produced plasma of this embodiment sterilizer is very low to ozone concentration will further reduce under the effect of air current module 500 and catalyst module 600, when realizing that plasma is all-round, no dead angle is disinfected, not only can avoid the adverse effect that ozone brought, also can shorten the disinfection time of sterilizer, improve disinfection efficiency.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

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 and a discharging assembly arranged in the gas chamber, wherein the side wall of the gas chamber is provided with a gas outlet and a gas inlet which can be opened and closed;

the gas flow module is communicated with the gas outlet through a pipeline and is used for conveying the plasma in the gas chamber into the sterilization space;

a power module providing a high voltage power to the discharge assembly;

and the catalyst module is arranged in the air chamber or on the air flow module and is used for decomposing ozone.

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 main heating module and the plasma generating module work simultaneously.

4. A plasma sterilisation and disinfection cabinet according to claim 1,

the air flow module comprises an air outlet guide pipe and an air pump, the air pump is communicated with the air outlet through the pipeline, and the air outlet guide pipe is communicated with the sterilization space.

5. A plasma sterilisation and disinfection cabinet according to claim 4,

the flow rate of the gas output by the gas flow module is 0.8-5L/min.

6. A plasma sterilisation and disinfection cabinet according to claim 1,

the air inlet is communicated with an air inlet conduit which is communicated with the sterilization space or the external atmosphere.

7. 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.

8. 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。

9. A plasma sterilisation and disinfection cabinet according to claim 8,

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.