CN211434272U - Plasma sterilization and disinfection cabinet - Google Patents

Abstract

The utility model discloses a plasma disinfection cabinet that sterilizes, including plasma production module and power module, plasma production module includes the air chamber, is equipped with discharge assembly and fan in the air chamber, is equipped with air inlet and the gas outlet that can open and shut on the lateral wall of air chamber, and the air outlet communicates with the internal sterilization space of cabinet, and the air-out direction of fan is towards the gas 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

A plasma sterilization cabinet

technical field

The utility model relates to the technical field of disinfection cabinets, in particular to a plasma sterilization and disinfection cabinet.

Background technique

At present, disinfection cabinets generally use ultraviolet, high temperature, ozone and other methods for sterilization and disinfection. The scope of UV disinfection is limited and the disinfection is not thorough. High temperature sterilization consumes a lot of energy, and some plastic kitchenware that is not resistant to high temperature cannot be sterilized at high temperature. Although ozone has a significant sterilization effect, it has a strong irritating odor and a certain degree of toxicity. Excessive ozone will strongly stimulate the human respiratory tract, causing sore throat, chest tightness and coughing and other symptoms, and may cause bronchitis and emphysema; long-term work in a high-concentration ozone environment will cause neurotoxicity, dizziness, headache, vision loss, etc. Memory decline.

Plasma sterilization has been used in medical and other fields. There are two main methods of generating plasma: dielectric barrier discharge and corona discharge. The discharge devices include dielectric barrier discharge (DBD), glow plasma discharge (Glow), and firelight Plasma discharge (Spark), spiral arc discharge (Propeller Arc), etc. Plasma technology can achieve excellent sterilization effect, and its principle includes three parts: active particle group oxidation, high-speed particle breakdown and ultraviolet photons. The sterilization process does not require high temperature, and the active particles can quickly diffuse into the sterilization space in a gaseous manner to achieve sterilization without dead ends. However, the main reason for limiting the use of plasma technology is that a large amount of ozone will be produced during the plasma discharge process. The irritating odor and toxicity of ozone itself limit the use of plasma technology in daily life.

In order to control the ozone concentration, three methods are currently used: shortening the plasma discharge time, increasing the ambient temperature and adding catalysts to promote ozone decomposition.

The ozone concentration is reduced by shortening the plasma discharge time, which often results in long-term intermittent work. For example, in the refrigerator, discharge for 1min and rest for 30min, such a cycle method. Although this method can achieve the effect of sterilization, long-time standby will bring about an increase in power consumption, and this method is not suitable for other electrical appliances with discontinuous power supply, such as washing machines, disinfection cabinets, water heaters, air conditioners, etc.

Using the method of increasing the ambient temperature to reduce the ozone concentration, on the one hand, leads to an increase in power consumption, on the other hand, due to the slow decomposition of ozone, the cycle is prolonged and the work efficiency is reduced. At the same time, it is not suitable for household appliances that work at low or normal temperature, such as refrigerators and washing machines.

The method of adding catalyst to promote ozone decomposition has the phenomenon of low efficiency and easy deactivation of the catalyst, resulting in unstable ozone concentration and easy to exceed the standard.

The above information disclosed in this Background is only for enhancement of understanding of the background of the application and therefore it may contain that it does not form the prior art that is already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

In view of this, the present utility model proposes a plasma sterilization and disinfection cabinet, which can reduce the ozone concentration while realizing no dead angle and high-efficiency sterilization through plasma.

For realizing above-mentioned utility model purpose, the utility model adopts following technical scheme to realize:

A plasma sterilization and disinfection cabinet includes a cabinet body, and a sterilization space is formed inside the cabinet body, and further includes: a plasma generation module, which includes an air chamber, a discharge component and a fan arranged in the air chamber, and the The side wall of the air chamber is provided with an air inlet and an air outlet that can be opened and closed, the air outlet is communicated with the sterilization space, and the air outlet direction of the fan faces the air outlet; The discharge assembly provides high voltage power.

In order to dry the items to be sterilized and further reduce the ozone concentration, the disinfection cabinet further includes a main heating module, which is used to dry the items to be sterilized in the sterilization space and decompose the ozone in the sterilization space.

As a preferred embodiment, the heating temperature of the main heating module is 30-80°C.

As a preferred embodiment, in order to improve the sterilization efficiency, the main heating module and the plasma generation module work simultaneously.

In order to further reduce the ozone concentration, the gas chamber is provided with an auxiliary heating module, which is used for decomposing the ozone in the gas chamber.

In order to realize that the air inlet and the air outlet can be opened and closed, the air inlet is provided with a first block that can be opened and closed, and the air outlet is provided with a second block that can be opened and closed.

In order to generate uniform plasma and reduce ozone concentration, the discharge assembly includes a high-voltage electrode, a ground electrode and a dielectric layer, and the dielectric layer is provided between the high-voltage electrode and the ground electrode; the discharge of the discharge assembly The power density is greater than 0.17W/cm ² .

Also in order to generate uniform plasma and reduce ozone concentration, the high-voltage electrode is connected to the power module, and the high-voltage power provided by the power module includes sinusoidal high-voltage and pulsed high-voltage power.

In order to further reduce the ozone concentration, the airflow speed blown by the fan is 0.8L/min~5L/min.

Compared with the prior art, the advantages and positive effects of the present utility model are:

The utility model provides a plasma sterilization and disinfection cabinet. The plasma sterilization and disinfection cabinet comprises a plasma generation module and a power supply module. The plasma generation module includes an air chamber, a discharge assembly and a fan are arranged in the air chamber, and an air inlet and an air outlet that can be opened and closed are arranged on the side wall of the air chamber, and the air outlet is communicated with the sterilization space in the cabinet, and the air outlet of the fan direction towards the air outlet. The power module provides high-voltage power to the discharge assembly, so that the discharge assembly generates plasma. The plasma generation module includes an initial discharge stage and a stable discharge stage. During the initial discharge stage, the gas chamber is closed, and the discharge component generates plasma under the action of the power module. After the initial discharge stage works for a period of time, the ozone concentration of the plasma in the gas chamber decreases. Then enter the stable discharge stage, at this time the fan is turned on, the air inlet and outlet are opened, the plasma with low ozone concentration in the air chamber enters the sterilization space for sterilization, and at the same time, new air enters the air chamber for discharge Generate new plasma. The sterilization cabinet can achieve sterilization by inputting plasma with low ozone concentration into the sterilization space, and at the same time, it can avoid the adverse effects brought by ozone.

Other features and advantages of the present invention will become more apparent after reading the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

Fig. 1 is the principle schematic diagram of the utility model disinfection cabinet embodiment;

Fig. 2 is the structural representation of the embodiment of the sterilization cabinet of the present utility model;

FIG. 3 is a schematic structural diagram 1 of an embodiment of the plasma generation module of the present invention;

FIG. 4 is a second structural schematic diagram of an embodiment of a plasma generating module of the present invention;

Fig. 5 is the ozone concentration curve of the embodiment of the disinfection cabinet of the utility model under the first working mode;

Fig. 6 is the ozone concentration curve of the embodiment of the disinfection cabinet of the utility model under the second working mode;

7 is a schematic diagram of the relationship between discharge power and ozone concentration in the embodiment of the disinfection cabinet of the present invention;

8 is a schematic diagram of the relationship between the gas flow rate and the ozone concentration in the embodiment of the disinfection cabinet of the present invention.

Among them, 100-plasma generation module, 110-discharge assembly, 111-high voltage electrode, 112-dielectric layer, 113-ground electrode, 120-air chamber, 121-air inlet, 122-air outlet, 123-first block Sheet, 124-Second Baffle, 130-Fan, 140-Upper Platen, 141-Upper Through Hole, 150-Lower Platen, 151-Lower Through Hole, 200-Power Module, 300-Cabinet, 310-Sterilization Space , 400-main heating module.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that, in the description of the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate directions or The terminology of the positional relationship is based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

The utility model discloses a plasma sterilization and disinfection cabinet. Referring to FIGS. 1 to 4 , FIG. 1 is a schematic diagram of the principle of the disinfection cabinet, FIG. 2 is a schematic structural diagram of the disinfection cabinet, and FIG. 3 is that the air chamber of the plasma generation module is closed. Figure 4 is a schematic structural diagram of the plasma generation module when the gas chamber is in an open state. The sterilization cabinet includes a cabinet body 300, and a sterilization space 310 is formed inside the cabinet body 300, and the articles to be sterilized are placed in the sterilization space 310 for sterilization. The sterilization cabinet further includes a plasma generating module 100 and a power supply module 200. The plasma generating module 100 includes an air chamber 120, a hollow cavity is formed in the air chamber 120, and a discharge assembly 110 and a fan 130 are arranged in the hollow cavity. The wall is provided with an openable air inlet 121 and an air outlet 122 , the air outlet 122 communicates with the sterilization space 310 , and the air outlet direction of the fan 130 faces the air 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 generation module 100 includes an initial discharge stage and a stable discharge stage. During 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, and the discharge assembly 110 generates plasma under the action of the power module 200 . After the initial discharge stage works for a period of time, the ozone concentration of the plasma in the gas chamber 120 decreases and stabilizes; then, the plasma generation module 110 enters the stable discharge stage, at which time the fan 130 is turned on, and 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 at the same time, the new outside air enters the air chamber 120 through the air inlet 121 for discharge to generate new plasma; this cycle , and finally complete the disinfection goal.

The plasma generated by the plasma generation module 100 is not directly input into the sterilization space 310 , but reacts in the closed air chamber 120 for a period of time, such as 1-5 minutes, until the plasma inside the air chamber 120 After stabilization, it is input into the sterilization space 310 for sterilization. The reason for this operation is that ozone and other active molecules will exist in the plasma generated by the discharge assembly 110 in the initial stage of discharge. If the ozone-containing plasma is directly input into the sterilization space 310 for sterilization, the odor of ozone will and toxicity will adversely affect the user. These ozone and active molecules are extremely unstable in the initial stage of discharge, and there will be reactions between ozone and other active molecules. Then, the plasma containing a certain amount of ozone and active molecules generated in the early stage of discharge is placed in the closed gas chamber 120. After the internal reaction for a period of time, ozone and other active molecules react with each other in the gas chamber to reduce the ozone concentration, and then, the plasma with low ozone concentration is input into the sterilization space 310 for sterilization, so as to achieve all-round, no dead angle sterilization, and Avoid the adverse effects of ozone. The plasma generation module 100 takes full advantage of the unstable plasma generated by the discharge assembly 110 at the initial stage of discharge, and uses the closed gas chamber 120 to provide a reaction space for the unstable plasma. Plasma is input into the sterilization space 310 for sterilization.

Further, the discharge assembly 110 adopts the form of dielectric barrier discharge in the prior art. Referring to FIG. 3 and FIG. 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 provided between the high voltage electrode 111 and the ground. Between the electrodes 113; the discharge power density of the discharge assembly 110 is greater than 0.17W/cm ² . The discharge power density is increased by increasing the discharge power of the discharge assembly 110 and reducing the discharge area. Increasing the discharge power density helps to reduce the ozone concentration. Figure 7 shows a schematic diagram of the relationship between discharge power and ozone concentration. It can be seen from the figure that the greater the discharge power density, the lower the ozone concentration.

Further, the high-voltage electrode 111 and the ground electrode 113 are connected to the power supply module 200, and the high-voltage power supply provided by the power supply module 200 includes a sinusoidal high-voltage power supply and a pulsed high-voltage power supply. Specifically, in this embodiment, the frequency of the sinusoidal high-voltage power supply is 50Hz-100MHz, the voltage amplitude is between 1kV-20kV, and the frequency of the pulsed high-voltage power supply is lower than 100kHz. The high voltage power supply so arranged helps to generate a uniform, low ozone concentration plasma.

When the plasma generating module 100 is in the stable discharge stage, the plasma in the air chamber 120 enters the sterilization space 310 through the air outlet 122 under the blowing action of the fan 130 . It is preferable that the air flow rate blown out by the fan 130 is 0.8 L/min to 5 L/min. The reason is that the active components in the plasma change with the change of the gas flow rate. In this embodiment, it is known through a large number of experiments that the ozone concentration decreases with the decrease of the gas flow rate. Figure 8 shows the relationship between the gas flow rate and ozone concentration measured in three different time periods. It can be seen from Figure 8 that the ozone concentration increases with the increase of the gas flow rate, and the ozone concentration increases with the decrease of the gas flow rate. Therefore, in order to reduce the ozone concentration, it is necessary to control the gas flow rate within a lower range. By reasonably controlling the rotational speed of the fan 130, the flow rate of the gas blown out 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) is arranged in the air chamber 120, which is used for decomposing the ozone in the air chamber 120 and further reducing the ozone concentration. The specific structural form of the auxiliary heating module is not specifically limited in the present invention, such as the use of PTC hot air, heating sheets and the like. The heating temperature of the auxiliary heating module is preferably not lower than 60° C. to ensure that ozone can be effectively decomposed and ozone concentration can be reduced.

The disinfection cabinet also includes a main heating module 400, which has two functions: on the one hand, it is used to dry the items to be sterilized in the sterilization space 310, and on the other hand, it is used to decompose a small amount of ozone existing in the sterilization space. Among them, the drying effect is the main function, and the decomposing ozone effect is supplemented. The specific structural form of the main heating module 400 is not specifically limited in the present invention, such as the use of PTC hot air, heating sheets and the like.

The heating temperature of the main heating module 400 is 30-80°C, preferably 60°C. The main heating module 400 within this temperature range can not only dry the items to be sterilized, but also decompose ozone.

The main heating module 400 works simultaneously with the plasma generating module 100 , that is, the main heating module 400 performs drying and decomposing ozone at the same time, which helps to shorten the sterilization time and improve the sterilization efficiency. In the existing disinfection cabinet, such as the ozone disinfection cabinet, the two processes of drying and decomposing ozone by heating are operated separately. After a large amount of ozone enters the sterilization space 310, the ozone is first used for sterilization, and the sterilization is completed. Afterwards, the heating module 400 is activated again to decompose the ozone, and after the ozone decomposition is completed, the heating module 400 continues to heat up to achieve drying. The processes of sterilization, decomposing ozone and drying are completed independently of each other, which greatly prolongs the disinfection time of the disinfection cabinet, and the efficiency is low. However, in this 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 very low, so the plasma entering the sterilization space 310 does not decompose ozone even if operation, can also meet the requirements of use. The main heating module 400 can decompose the remaining small amount of ozone while performing the drying operation, thereby further reducing the ozone concentration and improving the usability of the disinfection cabinet.

The plasma generation module 100 is described in detail below.

The discharge assembly 110 is sandwiched between the upper pressure plate 140 and the lower pressure plate 150 , and the upper pressure plate 140 , the high voltage electrode 111 , the dielectric layer 112 , the ground electrode 113 and the lower pressure plate 150 are in close contact from top to bottom. The upper pressing sheet 140 is provided with upper through holes 141 for heat dissipation of the high voltage electrode 111 . The lower pressing plate 150 is provided with a lower through hole 151 , the lower through hole 151 communicates 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 can be selected from metal aluminum, copper, iron, platinum or alloys thereof, preferably copper or stainless steel. The ground electrode can be optionally in sheet shape, wire shape, mesh shape, spiral shape or mixed type, preferably mesh shape. The dielectric layer 112 may be an insulating layer such as glass, ceramic, plastic or rubber, preferably ceramic. The air chamber 120 and the lower pressing sheet 150 are sealed together. The material of the air chamber 120 can be selected from insulating materials such as glass, ceramics, and plastics. For the convenience of observation, it is preferably transparent. The shape of the air chamber 120 can be designed as required.

The air inlet 121 is provided with a first block 123 that can be opened and closed, and the air outlet 122 is provided with a second block 124 that can be opened and closed. After the fan 130 is turned on, the airflow blown by the fan 130 blows the second blocking member 124 to open the second blocking member 124 to open the air outlet 122, and the plasma inside the air chamber 120 flows out through the air outlet 122. At this time, the air chamber 120 The internal pressure will change, and the first stopper 123 will be opened accordingly to open the air inlet 121 . In this embodiment, the first blocking member 123 and the second blocking member 124 are preferably self-hanging louvers or self-hanging films, fibers, sheets, and the like.

The air entering the air chamber 120 through the air inlet 121 may be the air from outside the sterilization cabinet or the air from the sterilization space 310 , depending on the installation position of the plasma generating module 100 . When the plasma generating module 100 is installed outside the cabinet 300 , the air inlet 121 communicates with the outside air of the sterilization cabinet to introduce outside air, and the air outlet 122 communicates with the sterilization space 310 . When the plasma generating module 100 is installed inside the sterilization space 310 , the air inlet 121 communicates with the air in the sterilization space 310 to introduce internal air, and the air outlet 122 communicates with the sterilization space 310 .

The disinfection cabinet in this embodiment has two working modes, the first is intermittent discharge, and the second is continuous discharge.

When the first intermittent discharge is used, the specific working mode adopted in this embodiment is to work for 10 minutes, stop for 5 minutes, and complete a disinfection task of the disinfection cabinet in two cycles, that is, the total disinfection time of the disinfection cabinet is 30 minutes. After the disinfection cabinet starts the disinfection task, the power module 200 starts to supply power to the plasma generation module 100, and the plasma generation module 100 first enters the initial discharge stage. After working for 1-5 minutes, preferably 2 minutes, the plasma generation module 100 enters the stable discharge stage, and the gas The plasma in the chamber 120 enters the sterilization space 310 for sterilization, and at the same time, new air enters the air chamber 120 for discharge to generate new plasma. When the total discharge of the plasma generation module 100 reaches 10 minutes, the power module 200 stops the power supply. The discharge component 110 supplies power to prevent the discharge component 110 from continuing to discharge and damage the components, and completes the first cycle of discharge. After the discharge assembly 110 stops for 5 minutes, the power module 200 supplies power to the discharge assembly 110 again, and the work flow of the first cycle is repeated. When two cycles of discharge are completed, the disinfection of the disinfection cabinet is completed. The main heating module 400 and the auxiliary heating module are in working state during the whole sterilization process. FIG. 5 shows the ozone concentration curve measured when the disinfection cabinet of the above embodiment adopts the first working mode.

When the second type of continuous discharge is adopted, the specific working mode adopted in this embodiment is to work for 10 minutes and stop for 10 minutes, and one cycle of discharge can complete the disinfection task of the disinfection cabinet, that is, the total disinfection time of the disinfection cabinet is 20 minutes. After the disinfection cabinet starts the disinfection task, the power supply module 200 starts to supply power to the discharge assembly 110, and the plasma generation module 100 first enters the initial discharge stage. The plasma inside enters the sterilization space 310 for sterilization, and at the same time, new air enters the air chamber 120 for discharge to generate new plasma. When the total discharge of the plasma generation module 100 reaches 10 minutes, the power module 200 stops the discharge component. 110 supplies power to prevent the discharge component 110 from continuing to discharge and damage the components. Then, after the discharge assembly 110 stops for 10 minutes, the purpose of this stage is mainly to decompose the remaining ozone in the sterilization space 310, further reduce the ozone concentration, and the sterilization task of the sterilization cabinet is completed. The main heating module 400 and the auxiliary heating module are in working state during the whole sterilization process. FIG. 6 shows the ozone concentration curve measured when the disinfection cabinet of the above embodiment adopts the second working mode.

It can be seen from FIG. 5 and FIG. 6 that the ozone content in the plasma generated by the disinfection cabinet in this embodiment is very low. While achieving all-round and dead-end sterilization of the plasma, it can not only avoid the ozone-induced sterilization It can also shorten the disinfection time of the disinfection cabinet and improve the disinfection efficiency.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit of the technical solutions of the embodiments of the present invention and range.

Claims (9)

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.

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