Negative pressure sterilization and disinfection device and method for clean room

Abstract

The invention discloses a negative pressure sterilization and disinfection device and method for a clean room, the negative pressure sterilization and disinfection device comprises a sterilization and disinfection box and a filter box, the sterilization and disinfection box is communicated with the filter box through an air conveying pipe, the sterilization and disinfection box is provided with an air inlet, the filter box is provided with an air outlet, and the air outlet is provided with an induced draft fan; a humidifying mechanism and a plasma mechanism are installed in the disinfection and sterilization box, a dehumidifying mechanism and a filter element are installed in the filter box, and the humidifying mechanism, the plasma mechanism, the dehumidifying mechanism and the filter element are sequentially arranged in the air circulation direction. The sterilizing box and the filtering box are separated and connected through the air conveying pipe, activated species generated by ionization of the plasma mechanism in the sterilizing box are dissolved into water drops generated by the humidifying mechanism to form water mist with the sterilizing function, the air conveying pipe is sterilized and disinfected, the air conveying pipe is prevented from polluting the clean room, the sterilizing effect of the clean room is improved, and the service life of the clean room is prolonged. The sterilization period is prolonged, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment, and in particular to a negative pressure sterilization and disinfection device and method for a clean room. Background Art

[0002] A clean room is a confined space where parameters such as air cleanliness, temperature, humidity, pressure, noise, etc. are controlled. Whether it is an industrial clean room or a biological clean room, it is necessary to sterilize the clean room regularly to ensure that the clean room meets the cleanliness level requirements.

[0003] The sterilization of clean rooms mainly adopts ultraviolet sterilization, chemical reagent fumigation and disinfectant spraying. However, whether it is ultraviolet sterilization, chemical reagent fumigation or disinfectant spraying, they only sterilize the clean room, but ignore the sterilization of the clean room air supply system and air supply pipeline, so that when the clean room is put back into use, the bacteria in the air supply system will soon contaminate the clean room.

[0004] Based on the above technical problems, the present application proposes a clean room negative pressure sterilization and disinfection device and method. Summary of the invention

[0005] The purpose of the present invention is to provide a clean room negative pressure sterilization and disinfection device and method to solve the technical problems mentioned in the background technology. The purpose of the present invention is achieved through the following technical solutions: A clean room negative pressure sterilization and disinfection device comprises a disinfection box and a filter box, the disinfection box is connected with the filter box through an air duct, an air inlet is provided on the disinfection box, an air outlet is provided on the filter box, and an induced draft fan is installed at the air outlet; a humidification mechanism and a plasma mechanism are installed in the disinfection box, a dehumidification mechanism and a filter element are installed in the filter box, and the humidification mechanism, plasma mechanism, dehumidification mechanism and filter element are arranged in sequence along the air circulation direction.

[0006] Furthermore, the humidification mechanism includes a humidifier and a humidification pipe. The humidifier is installed below the disinfection box. The humidification pipe is vertically installed on the top of the humidifier. The upper end of the humidification pipe extends into the disinfection box. The upper end of the humidification pipe is lower than the plasma mechanism.

[0007] Furthermore, the plasma mechanism includes a mounting seat and a plasma generator. The mounting seat is a hollow shell, which is fixed in the disinfection box through a connecting pipe. The size of the mounting seat is smaller than the size of the disinfection box. A plurality of mounting holes are opened on the side of the mounting seat close to the air inlet, and a plurality of plasma generators are installed in the mounting holes, and the working surface of the plasma generator faces the air inlet.

[0008] Furthermore, the plasma generator is encapsulated in an insulating shell, and the plasma generator includes a cathode plate, a dielectric plate and an anode plate, which are arranged in a pyramid structure from top to bottom, and through holes are coaxially opened on the cathode plate, the dielectric plate and the anode plate, and the through holes penetrate the shell; a metal tube is fixed on the cathode plate, the metal tube is coaxially arranged with the through hole, and the metal tube is connected to a high-pressure gas source; a wire is installed on the anode plate, and the metal tube and the wire are electrically connected to the voltage regulator.

[0009] Furthermore, the thickness of the cathode plate is 1.5-3 mm, the thickness of the dielectric plate is 1-2 mm; the thickness of the anode plate is 1.5-3 mm; and the diameter of the through hole is 0.5-1.5 mm.

[0010] Furthermore, the size of the through hole on the cathode plate is equal to the size of the through hole on the anode plate, and the size of the through hole on the dielectric plate is greater than the size of the through hole on the cathode plate.

[0011] Furthermore, the dehumidification mechanism includes a cooling pipe and a foam metal mesh, the foam metal mesh is installed in the filter box, the cooling pipe is connected to the circulating cooler, and the cooling pipe is wound around the outside of the foam metal mesh.

[0012] Furthermore, the filter element is a cylindrical structure, the filter element is coaxially installed at the exhaust port, and a cover plate is installed at one end of the filter element away from the exhaust port.

[0013] Furthermore, an ultraviolet sterilization lamp is installed in the filter element.

[0014] A sterilization method for any of the above-mentioned clean room negative pressure sterilization and disinfection devices, comprising the following steps: Step S1, turning on the induced draft fan and the plasma mechanism, the plasma mechanism disinfects the clean room air drawn in from the air inlet; Step S2, turning on the humidification mechanism and the dehumidification mechanism, and simultaneously disinfecting the air delivery pipe; Step S3, turning off the humidification mechanism and the dehumidification mechanism, and only disinfecting the clean room air drawn in from the air inlet; Step S4, repeat the cycle of step S2-step S3 to achieve intermittent disinfection of the air duct.

[0015] The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages: By separating the disinfection box from the filter box and connecting them through the air duct, the activated species produced by ionization of the plasma mechanism in the disinfection box are dissolved in the water droplets produced by the humidification mechanism to form a water mist with disinfection effect, thereby achieving sterilization and disinfection of the air duct, avoiding contamination of the clean room by the air duct, improving the disinfection effect of the clean room, extending the disinfection cycle, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the disinfection box in the embodiment of the present application; Figure 3 This is a schematic diagram of the plasma mechanism structure of an embodiment of the present application; Figure 4 This is a schematic diagram of the appearance of a plasma generator according to an embodiment of the present application; Figure 5 This is a schematic diagram of the structure of a plasma generator according to an embodiment of the present application; Figure 6 This is a schematic diagram of the filter box structure of an embodiment of the present application.

[0018] Markings in the attached drawing: 1. disinfection box; 11. air inlet; 2. air duct; 3. filter box; 31. exhaust outlet; 4. induced draft fan; 5. humidification duct; 6. plasma mechanism; 61. mounting base; 62. plasma generator; 621. housing; 622. cathode plate; 623. dielectric plate; 624. anode plate; 625. through hole; 626. copper tube; 627. wire; 63. connecting pipe; 7. foam metal mesh; 8. filter element; 81. cover plate. DETAILED DESCRIPTION

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the drawings and specific implementation methods of the specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0020] like Figure 1-Figure 6A negative pressure sterilization and disinfection device for a clean room shown in the figure includes a disinfection box 1, an air duct 2 and a filter box 3. The disinfection box 1 and the filter box 3 are both cylindrical shells. The air duct 2 is connected between the disinfection box 1 and the filter box 3, so that the disinfection box 1 is connected to the filter box 3. An air inlet 11 is provided at the left end of the disinfection box 1, and the air inlet 11 is located at the top of the clean room. An exhaust port 31 is provided at the right end of the filter box 3, and the exhaust port 31 is installed at the lower part of the side of the clean room. An induced draft fan 4 is installed at the exhaust port 31. Driven by the induced draft fan 4, the air in the clean room passes through the disinfection box 1, the air duct 2 and the filter box 3 in turn and then flows back to the clean room, thereby achieving sterilization and disinfection and filtering and impurity removal of the air in the clean room. Preferably, the filter box 3 can also be connected to the fresh air system for inputting fresh air into the clean room.

[0021] like Figure 2 As shown, a humidifying mechanism and a plasma mechanism 6 are sequentially installed in the disinfection box 1 from left to right. The humidifying mechanism includes a humidifier (not shown) and a humidifying pipe 5. The humidifier is installed below the disinfection box 1. The humidifying pipe 5 is vertically installed on the top of the humidifier. The upper end of the humidifying pipe 5 extends into the disinfection box 1. The extension line of the humidifying pipe 5 is located on the central axis of the disinfection box 1, and the upper end of the humidifying pipe 5 is lower than the plasma mechanism 6. When in use, the humidifier transports water mist into the disinfection box 1 through the humidifying pipe 5. A certain distance is left between the humidifying pipe 5 and the plasma mechanism 6 to ensure that the water mist is evenly mixed in the air before passing through the plasma mechanism 6.

[0022] like Figure 2-Figure 5 As shown, the plasma mechanism 6 includes a mounting seat 61, a plasma generator 62 and a connecting pipe 63. The mounting seat 61 is a disc-shaped hollow shell. The mounting seat 61 is fixed in the disinfection box 1 through two connecting pipes 63. The size of the mounting seat 61 is smaller than the size of the disinfection box 1, so as to leave a passage for air to pass between the mounting seat 61 and the inner wall of the disinfection box 1. A plurality of mounting holes are provided on the side of the mounting seat 61 close to the air inlet 11. The plurality of mounting holes are evenly distributed in an array or a circle. A plasma generator 62 is installed in each mounting hole, and the working surface of the plasma generator 62 faces the air inlet 11. When the plasma mechanism 6 is turned on, the plasma mechanism 6 emits a plasma jet in the direction of the air inlet 11 to disinfect bacteria and viruses in the air. At the same time, it can also decompose some organic pollutants in the air to improve the air quality.

[0023] like Figure 4 , Figure 5As shown, the plasma generator 62 includes a shell 621, a cathode plate 622, a dielectric plate 623 and an anode plate 624. The shell 621 is a polytetrafluoroethylene cylindrical hollow shell with a thickness of 1.5 mm. The cathode plate 622, the dielectric plate 623 and the anode plate 624 are all encapsulated in the shell 621 to avoid electric shock accidents. The cathode plate 622 is a disc-shaped aluminum plate with a thickness of 2 mm and a radius of 10 mm. The dielectric plate 623 is a mica plate with a thickness of 1.5 mm and a radius of 15 mm. The anode plate 624 is a disc-shaped aluminum plate with a thickness of 2 mm and a radius of 25. The cathode plate 622, the dielectric plate 623 and the anode plate 64 are fixed from top to bottom in a pyramid structure. A through hole 625 is coaxially opened in the center of the cathode plate 622, the dielectric plate 623 and the anode plate 624. The through hole 625 penetrates the shell 621 and has a diameter of 1 mm. A copper tube 626 is fixed on the cathode plate 622. The copper tube 626 is coaxially arranged with the through hole 625. The upper end of the copper tube 626 is connected to a high-pressure gas source through a plastic hose for blowing air into the through hole 625. A copper wire 627 is fixed on the anode plate 624. The copper tube 626 and the wire 627 are electrically connected to the voltage regulator.

[0024] When in use, high-pressure air is blown into the through hole 615 through the copper tube 626, and an AC voltage of 500V is applied between the two electrodes through the copper tube 626 and the wire 627, which will cause discharge in the gap between the electrodes and eject a 23mm plasma jet.

[0025] Preferably, the size of the through hole 625 on the cathode plate 622 is equal to the size of the through hole 625 on the anode plate 624, while the size of the through hole 625 on the dielectric plate 623 is larger than the size of the through hole 625 on the cathode plate 622, so as to increase the facing area between the cathode plate 622 and the anode plate 623, which is beneficial to the ionization of the air in the through hole 625.

[0026] like Figure 6 As shown, a dehumidification mechanism and a filter element 8 are sequentially installed from left to right in the filter box 3. The dehumidification mechanism includes a cooling pipe (not shown) and a foam metal mesh 7, the foam metal mesh 7 is vertically installed in the filter box 3, the cooling pipe is wound around the edge of the foam metal mesh 7, and the cooling pipe is connected to the circulating cooler to cool the foam metal mesh 7 to dehumidify the air in the air supply pipe 2.

[0027] The filter element 8 is a cylindrical structure, and the filter element 8 is coaxially installed at the exhaust port 31. A cover plate 81 is installed at the left end of the filter element 8, so that air flows out from the filter surface of the filter element 8. Preferably, an ultraviolet sterilization lamp (not shown) is installed in the filter element 8 to sterilize and disinfect the inner wall of the filter element 8 to prevent bacteria and viruses from being enriched on the filter element 8. Example

[0028] A sterilization method using the clean room negative pressure sterilization and disinfection device in Example 1, comprising the following steps: Step S1, turn on the induced draft fan and plasma mechanism, the air in the clean room enters the disinfection box from the air inlet, the plasma mechanism ionizes to generate electrons, the nitrogen and oxygen in the air collide with the electrons, and react to generate nitrogen oxides and ozone, which disinfect the clean room air drawn in from the air inlet.

[0029] Step S2: After the induced draft fan has been running for a period of time, the humidification mechanism and the dehumidification mechanism are turned on. The nitrogen oxides and ozone generated by ionization of the plasma mechanism react with water to generate nitrite ions, nitrate ions and hydrogen peroxide, which are then transmitted along the air duct along with the water mist to achieve disinfection of the air duct.

[0030] Step S3: After the humidifying mechanism and the dehumidifying mechanism have been running for a period of time, the humidifying mechanism and the dehumidifying mechanism are turned off, and only the clean room air drawn in from the air inlet is disinfected to avoid excessive humidity affecting the humidity in the clean room.

[0031] Step S4, repeat the cycle of step S2-step S3 to achieve intermittent disinfection of the air duct, wherein, before the negative pressure sterilization and disinfection device is shut down, the humidification mechanism and the dehumidification mechanism must be closed for at least 30 minutes to avoid water mist remaining in the air duct and causing corrosion of the air duct.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A clean room negative pressure sterilization and disinfection device, characterized in that: It includes a disinfection box and a filter box, the disinfection box is connected with the filter box through an air duct, the disinfection box is provided with an air inlet, the filter box is provided with an air outlet, and a draft fan is installed at the air outlet; a humidifying mechanism and a plasma mechanism are installed in the disinfection box, a dehumidifying mechanism and a filter element are installed in the filter box, and the humidifying mechanism, the plasma mechanism, the dehumidifying mechanism and the filter element are arranged in sequence along the air circulation direction; the plasma mechanism includes a mounting seat and a plasma generator, the mounting seat is a hollow shell, the mounting seat is fixed in the disinfection box by a connecting pipe, and the size of the mounting seat is smaller than the size of the disinfection box; a side of the mounting seat close to the air inlet is provided with a A plurality of mounting holes, a plurality of plasma generators are mounted in the mounting holes, and the working surface of the plasma generator faces the air inlet; the plasma generator is encapsulated in an insulating shell, the plasma generator comprises a cathode plate, a dielectric plate and an anode plate, the cathode plate, the dielectric plate and the anode plate are arranged in a pyramid structure from top to bottom, the cathode plate, the dielectric plate and the anode plate are coaxially provided with through holes, and the through holes penetrate the shell; a metal tube is fixed on the cathode plate, the metal tube is coaxially arranged with the through hole, and the metal tube is connected with high-pressure air; a wire is installed on the anode plate, and the metal tube and the wire are electrically connected with the voltage regulator.

2. A clean room negative pressure sterilization and disinfection device according to claim 1, characterized in that: The humidification mechanism includes a humidifier and a humidification pipe. The humidifier is installed below the disinfection box. The humidification pipe is vertically installed on the top of the humidifier. The upper end of the humidification pipe extends into the disinfection box. The upper end of the humidification pipe is lower than the plasma mechanism.

3. A clean room negative pressure sterilization and disinfection device according to claim 1, characterized in that: The thickness of the cathode plate is 1.5-3 mm, the thickness of the dielectric plate is 1-2 mm; the thickness of the anode plate is 1.5-3 mm; and the diameter of the through hole is 0.5-1.5 mm.

4. A clean room negative pressure sterilization and disinfection device according to claim 1, characterized in that: The size of the through hole on the cathode plate is equal to the size of the through hole on the anode plate, and the size of the through hole on the dielectric plate is greater than the size of the through hole on the cathode plate.

5. A clean room negative pressure sterilization and disinfection device according to claim 1, characterized in that: The dehumidification mechanism comprises a cooling pipe and a foam metal mesh, wherein the foam metal mesh is installed in the filter box, the cooling pipe is communicated with a circulating cooling machine, and the cooling pipe is arranged around the outside of the foam metal mesh.

6. A clean room negative pressure sterilization and disinfection device according to claim 1, characterized in that: The filter element is a cylindrical structure and is coaxially installed at the air outlet. A cover plate is installed at one end of the filter element away from the air outlet.

7. A clean room negative pressure sterilization and disinfection device according to claim 1, characterized in that: An ultraviolet sterilization lamp is installed in the filter element.

8. A sterilization method for the clean room negative pressure sterilization and disinfection device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, turning on the induced draft fan and the plasma mechanism, the plasma mechanism disinfects the clean room air drawn in from the air inlet; Step S2, turning on the humidification mechanism and the dehumidification mechanism, and simultaneously disinfecting the air delivery pipe; Step S3, turning off the humidification mechanism and the dehumidification mechanism, and only disinfecting the clean room air drawn in from the air inlet; Step S4, repeat the cycle of step S2-step S3 to achieve intermittent disinfection of the air duct.

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