A plasma sterilization device for a hospital exhaust system

Abstract

The present invention discloses a plasma sterilization device for a hospital exhaust system, which mainly includes a box body, a control system, an inlet exhaust fan, and an outlet exhaust fan; a partition is arranged inside the box body, a plasma generator is arranged on the left side of the partition, and a ultraviolet UV light source chamber is arranged on the other side; ventilation holes are arranged on both sides of the box body and are respectively connected to the inlet and outlet exhaust fans through inlet and outlet air pipes; a gas flow regulator is arranged on the inlet air pipe, and an alarm is arranged on the outlet air pipe; a control system is arranged on the outer wall of the box body. The exhaust fan sends the ambient air containing microorganisms such as bacteria and germs through a filter screen into the low-temperature ultra-high-pressure plasma generator, and under the action of active groups of plasma, high-speed particle breakdown, and ultraviolet light, etc., the microorganisms lose their activity. At the same time, conventional ultraviolet disinfection is assisted to further ensure the sterilization quality; the invention has the characteristics of simple structure, convenient operation, high safety, and good disinfection and sterilization effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of air purification and plasma sterilization, and specifically provides a plasma sterilization device for a hospital exhaust system. Background Art

[0002] Disinfection refers to killing or removing pathogenic microorganisms on a transmission medium to render it harmless. A sterilizer is an instrument that can kill or remove all microorganisms on a transmission medium, including viruses, bacterial spores, and non-pathogenic microorganisms. According to different working principles, exhaust disinfection and sterilization devices usually have four methods: exhaust disinfection devices based on the BH thermal killing technology principle, exhaust disinfection devices based on the BU ultraviolet killing technology principle, exhaust disinfection devices based on the BO ozone, plasma, and high-voltage electrostatic killing technology principle, and exhaust disinfection devices based on the BC chemical killing technology principle.

[0003] Plasma is generated by the ionization of gaseous substances under the action of a strong electric field, and its main components include electrons, ions, atoms, molecules, active free radicals, and ray substances. Plasma sources have better mobility, and the material processing process is easy to automate, with convenient operation and high efficiency. Cold plasma is consistent with the survival space parameters of living organisms in its parameter space, greatly expanding its applications in biomedical and other related fields (such as disinfection and sterilization).

[0004] The utility model patent with the publication number CN202032692U discloses an air purification and sterilizer for use with a combined air handling unit, including a combined air handling unit housing. The key structural points are as follows: an air inlet and a fresh air inlet are provided on one side of the combined air handling unit housing, and an air outlet is provided on the other side. Inside the combined air handling unit housing, a polypropylene injection electrostatic layer, a UV light source, a photocatalyst layer, a surface cooler, a heater, a humidifier, and a blower are sequentially arranged in the direction from the fresh air inlet to the air outlet. The utility model patent with the publication number CN210345726U discloses an air purification and sterilizer for a combined air handling unit, including a chassis with a sterilization mechanism inside. The structural features are as follows: the sterilization mechanism includes a first partition and a second partition. A filtration chamber is provided on one side of the first partition, and a sterilization chamber is provided on the other side of the first partition. The inner wall of the filtration chamber is fixedly provided with a first ultraviolet germicidal lamp, and a filtration box is provided inside the filtration chamber. Two chutes are provided on the inner wall of the filtration box, etc. However, in actual use, the above two utility models cannot disinfect and sterilize the air conveniently and effectively during use, cannot monitor the exhaust volume and sterilization quality at any time, have no alarm measures for sterilization failure, cannot ensure the safety of the exhaust, and have complex structures and are difficult to clean and maintain. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a plasma sterilization device for a hospital exhaust system, which has the characteristics of simple structure, safe and convenient operation, and good disinfection and sterilization effect.

[0006] In order to achieve the above object, a plasma sterilization device for a hospital exhaust system designed by the present invention mainly includes a box body, a control system, an inlet exhaust fan, and an outlet exhaust fan. A partition is arranged inside the box body and is fixedly and sealingly connected to the inner wall of the box body; a plasma generator is arranged on one side of the partition; a ultraviolet UV light source chamber is arranged on the other side of the partition, and the plasma generator communicates with the ultraviolet UV light source chamber; an ultraviolet disinfection lamp is installed in the ultraviolet UV light source chamber; the plasma generator communicates with the inlet exhaust fan through an air inlet pipe, and the ultraviolet UV light source chamber communicates with the outlet exhaust fan through an air outlet pipe; a gas flow regulator is arranged on the air inlet pipe; an alarm is arranged on the air outlet pipe; the control system is arranged on the outer wall of the box body, and the control system is electrically connected to the box body, the plasma generator, the ultraviolet disinfection lamp, the alarm, the flow regulator, the inlet exhaust fan, and the outlet exhaust fan.

[0007] The plasma generator includes a cathode, an anode, a jet orifice, an insulating plate, and a gas guide orifice; the cathode and the anode are oppositely installed on the insulating plate and are in a flared shape. The two ends of the cathode and the anode are respectively connected to the jet orifice and the gas guide orifice, and the jet orifice is located at the smaller end of the flare, and the gas guide orifice is located at the larger end of the flare. A discharge region is formed between the cathode and the anode. The jet orifice communicates with the air inlet pipe, and the gas guide orifice communicates with the ultraviolet UV light source chamber.

[0008] The jet orifice adopts a Laval nozzle structure.

[0009] The insulating plate is of a hollow structure, and a plurality of air outlet holes are arranged on the upper surface. The air outlet holes communicate the discharge region with the hollow of the insulating plate (35).

[0010] Both ends of the ultraviolet disinfection lamp are fixedly connected to the inner wall of the box body, and the number is set to be multiple.

[0011] A core killing condition detection device is installed at the lower end of the alarm and is placed in the air outlet pipe.

[0012] Filter nets are arranged inside both the inlet exhaust fan and the outlet exhaust fan.

[0013] The advantages of the present invention compared with the prior art are as follows:

[0014] 1) The present invention adopts a new type of atmospheric pressure low-temperature plasma discharge sterilization technology. The plasma discharge has a large size, good stability, and high energy efficiency. At the same time, it is assisted by a UV light source for secondary disinfection to further ensure the sterilization effect and high safety. The device has a simple structure and is convenient for installation and maintenance.

[0015] 2) By setting an air flow regulator in the intake pipe, the treatment gas volume and pressure can be monitored and adjusted at any time to meet the exhaust sterilization requirements in different environments. By setting a core killing condition alarm at the outlet, the failure of the device to kill microorganisms can be prevented, ensuring the safety of the discharged gas and no secondary pollution is generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of a plasma sterilization device for a hospital exhaust system according to the present invention;

[0018] Figure 2 For Figure 1 the schematic structural diagram of the plasma generator;

[0019] Figure 3 For Figure 1 the sectional structure of the plasma generator and the internal gas flow diagram.

[0020] The meanings of the reference numerals in the drawings are as follows: 1. Box body; 2. Control system; 3. Plasma generator; 4. Partition board; 5. UV light source chamber; 6. Ultraviolet disinfection lamp; 7. Alarm; 8. Outlet pipe; 9. Intake pipe; 10. Flow regulator; 11. Inlet exhaust fan; 12. Outlet exhaust fan; 31. Cathode; 32. Anode; 33. Air outlet hole; 34. Jet orifice; 35. Insulating board; 36. Air guiding port; 71. Core killing condition detection device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the following described embodiments are only a part of the embodiments of the present invention, rather than all. Based on the embodiments described in the present invention, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the present invention. Detailed implementation manner:

[0023] Such as Figure 1As shown in the figure, this embodiment illustrates a plasma sterilization device for a hospital exhaust system, which mainly includes a box body 1, a control system 2, an inlet exhaust fan 11, and an outlet exhaust fan 12. A partition 4 is arranged inside the box body 1 and is fixedly and sealingly connected to the inner wall of the box body 1. On one side of the partition 4, there is a plasma generator 3. On the other side of the partition 4, there is a UV light source chamber 5. The plasma generator 3 communicates with the UV light source chamber 5. In the UV light source chamber 5, there is a UV disinfection lamp 6 installed. The plasma generator 3 communicates with the inlet exhaust fan 11 through an inlet pipe 9, and the UV light source chamber 5 communicates with the outlet exhaust fan 12 through an outlet pipe 8. A gas flow regulator 10 is arranged on the inlet pipe 9 to monitor the gas flow rate and pressure about to enter the plasma generator in real time and has an adjustment function. An alarm 7 is arranged on the outlet pipe 8. At the lower end of the alarm 7, there is a core killing condition detection device 71 placed inside the outlet pipe 8 to monitor the disinfection and sterilization effect of the sterilization device in real time and alarm when the core killing condition fails. The control system 2 is arranged on the outer wall of the box body 1. The control system 2 is electrically connected to the box body 1, the plasma generator 3, the UV disinfection lamp 6, the alarm 7, the flow regulator 10, the inlet exhaust fan 11, and the outlet exhaust fan 12. Control is achieved through the control system.

[0024] As Figure 2 and Figure 3 shown, in actual production, a plasma generator with the following structure can be adopted, including a cathode 31, an anode 32, a jet nozzle 34, an insulating plate 35, and a gas guide port 36. The cathode 31 and the anode 32 are oppositely installed on the insulating plate 35 and are in a flared shape. The two ends of the cathode 31 and the anode 32 are respectively connected to the jet nozzle 34 and the gas guide port 36. And the jet nozzle 34 is located at the smaller end of the flare, and the gas guide port 36 is located at the larger end of the flare. A discharge region is formed between the cathode 31 and the anode 32. The jet nozzle 34 communicates with the inlet pipe 9, and the gas guide port 36 communicates with the UV light source chamber 5.

[0025] The jet nozzle 34 adopts a Laval nozzle structure to increase the gas flow rate at the jet nozzle. The insulating plate 35 is of a hollow structure, and a plurality of air outlet holes 33 are arranged on the upper surface. The air outlet holes 33 communicate the discharge region with the hollow of the insulating plate 35. The gas ejected from the jet nozzle 33 passes through the hollow structure and is ejected from all the air outlet holes 33 to fully contact the discharge plasma.

[0026] Both ends of the UV disinfection lamp 6 are fixedly connected to the inner wall of the box body 1, and the number is set to be multiple.

[0027] Both the inlet exhaust fan 11 and the outlet exhaust fan 12 are internally provided with filters to perform primary filtration on large particle dust in the ambient air and prevent large particle dust in the air from entering the device.

[0028] The working principle of the present invention is as follows:

[0029] The plasma sterilization device of the present invention is installed in the hospital exhaust system. The exhaust pneumatic system sends the ambient air containing microorganisms through the filter of the inlet exhaust fan 11 at a wind speed of 100 - 2000 cubic meters per hour, and feeds it into the plasma generator through the intake pipe 9 and the jet orifice 34. The output end of the constant-current high-frequency high-voltage pulse power supply is connected to the two electrode plates of the cathode 31 and the anode 32 for power supply. The high-speed air flow is fed in from the jet orifice 34 along the symmetry axis direction of the two electrodes, providing the medium for generating plasma. The insulating plate 35 discharges air from the air outlet holes 33, giving a side impact to the plasma in the discharge area, improving the fluidity of the plasma, and ensuring sufficient contact between the discharged gas and the plasma. Then, the microorganisms and the plasma in the gas enter the ultraviolet UV light source chamber 5 through the air guide port 36. Under the action of the active groups of the plasma, high-speed particle breakdown, and ultraviolet light, etc., the microorganisms in the gas completely lose their activity, achieving the purpose of disinfection and sterilization. At the same time, it assists in conventional ultraviolet disinfection to further ensure the sterilization quality. Finally, the treated gas is discharged into the outside through the outlet pipe 8 and the outlet exhaust fan 12 to ensure the safety of the gas discharged into the outside.

[0030] This device is particularly suitable for highly efficient disinfection and even sterilization of the exhaust of the suction system in medical centers, meeting the actual needs of preventing and controlling the COVID-19 epidemic.

Claims

1. A plasma sterilization device for a hospital exhaust system, mainly comprising a box body (1), a control system (2), an inlet exhaust fan (11), and an outlet exhaust fan (12), characterized in that: Inside the box body (1), a partition board (4) is arranged, which is fixedly and sealingly connected to the inner wall of the box body (1); on one side of the partition board (4), a plasma generator (3) is provided; on the other side of the partition board (4), there is an ultraviolet UV light source chamber (5), and the plasma generator (3) communicates with the ultraviolet UV light source chamber (5); an ultraviolet disinfection lamp (6) is installed in the ultraviolet UV light source chamber (5); the plasma generator (3) communicates with an inlet exhaust fan (11) through an air inlet pipe (9), and the ultraviolet UV light source chamber (5) communicates with an outlet exhaust fan (12) through an air outlet pipe (8); a gas flow regulator (10) is arranged on the air inlet pipe (9); an alarm (7) is arranged on the air outlet pipe (8); the control system (2) is arranged on the outer wall of the box body (1), and the control system (2) is electrically connected to the box body (1), the plasma generator (3), the ultraviolet disinfection lamp (6), the alarm (7), the flow regulator (10), the inlet exhaust fan (11) and the outlet exhaust fan (12). The plasma generator (3) includes a cathode (31), an anode (32), a jet orifice (34), an insulating plate (35) and a gas guiding orifice (36); the cathode (31) and the anode (32) are oppositely installed on the insulating plate (35) and are in a flared shape. The two ends of the cathode (31) and the anode (32) are respectively connected to the jet orifice (34) and the gas guiding orifice (36), and the jet orifice (34) is located at the smaller end of the flare, and the gas guiding orifice (36) is located at the larger end of the flare. A discharge area is formed between the cathode (31) and the anode (32). The jet orifice (34) communicates with the air inlet pipe (9), and the gas guiding orifice (36) communicates with the ultraviolet UV light source chamber (5).

2. The plasma sterilization device for a hospital exhaust system according to claim 1, characterized in that: The jet orifice (34) adopts a Laval nozzle structure.

3. The plasma sterilization device for a hospital exhaust system according to claim 2, characterized in that: The insulating plate (35) is of a hollow structure, and a plurality of air outlet holes (33) are arranged on the upper surface. The air outlet holes (33) communicate the discharge area with the hollow of the insulating plate (35).

4. The plasma sterilization device for a hospital exhaust system according to claim 1, characterized in that: Both ends of the ultraviolet disinfection lamp (6) are fixedly connected to the inner wall of the box body (1), and the number is set to be multiple.

5. The plasma sterilization device for a hospital exhaust system according to claim 1, characterized in that: A core killing condition detection device (71) is installed at the lower end of the alarm (7) and is placed in the air outlet pipe (8).

6. The plasma sterilization device for a hospital exhaust system according to claim 1, characterized in that: Filter meshes are arranged inside both the inlet exhaust fan (11) and the outlet exhaust fan (12).

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