A clean room negative pressure sterilization and disinfection device and method

Abstract

The present invention discloses a negative pressure sterilization and disinfection device and method for a clean room. The negative pressure sterilization and disinfection device includes a disinfection box and a filtration box. The disinfection box is communicated with the filtration box through an air delivery pipe. An air inlet is provided on the disinfection box, and an air outlet is provided on the filtration box. An induced draft fan is installed at the air outlet. A humidification mechanism and a plasma mechanism are installed in the disinfection box, and a dehumidification mechanism and a filter element are installed in the filtration box. The humidification mechanism, the plasma mechanism, the dehumidification mechanism, and the filter element are arranged in sequence along the air flow direction. By separating the disinfection box from the filtration box and connecting them through an air delivery pipe, the activated species ionized by the plasma mechanism in the disinfection box are dissolved into the water droplets generated by the humidification mechanism to form a water mist with a disinfection effect, so as to realize the sterilization and disinfection of the air delivery pipe, avoid the contamination of the clean room by the air delivery pipe, improve the disinfection effect of the clean room, extend the disinfection cycle, and improve the production efficiency.

Description

Technical Field

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

[0002] A clean room refers to an enclosed space in which parameters such as air cleanliness, temperature, humidity, pressure, and noise are controlled. Whether it is an industrial clean room or a biological clean room, it is necessary to regularly sterilize the clean room to meet the clean grade requirements.

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

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

[0005] The purpose of the present invention is to provide a negative pressure sterilization and disinfection device and method for a clean room to solve the technical problems mentioned in the background art. The purpose of the present invention is achieved through the following technical solutions:

[0006] A negative pressure sterilization and disinfection device for a clean room includes a disinfection box and a filtration box. The disinfection box is communicated with the filtration box through an air delivery pipe. An air inlet is opened on the disinfection box, and an air outlet is opened on the filtration box. An induced draft fan is installed at the air outlet; a humidification mechanism and a plasma mechanism are installed in the disinfection box, and a dehumidification mechanism and a filter element are installed in the filtration box. The humidification mechanism, the plasma mechanism, the dehumidification mechanism, and the filter element are arranged in sequence along the air flow direction.

[0007] Further, the humidification mechanism includes a humidifier and a humidification pipeline. The humidifier is installed below the disinfection box, the humidification pipeline is vertically installed on the top of the humidifier, the upper end of the humidification pipeline extends into the disinfection box, and the upper end of the humidification pipeline is lower than the plasma mechanism.

[0008] Further, 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 through a connecting pipe, and the size of the mounting seat is smaller than that of the disinfection box; a plurality of mounting holes are opened on one 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.

[0009] Further, the plasma generator is encapsulated in an insulating housing. The plasma generator includes 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. Through holes are coaxially formed in the cathode plate, the dielectric plate, and the anode plate, and the through holes penetrate the housing. A metal tube is fixed on the cathode plate, and the metal tube is coaxially arranged with the through hole and 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 a voltage regulator.

[0010] Further, 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; the diameter of the through hole is 0.5 - 1.5 mm.

[0011] Further, 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 larger than the size of the through hole on the cathode plate.

[0012] Further, 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 a circulating cooler, and the cooling pipe is wound around the outside of the foam metal mesh.

[0013] Further, the filter element is of 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.

[0014] Further, an ultraviolet sterilization lamp is installed inside the filter element.

[0015] A sterilization method for any one of the above-mentioned clean room negative pressure sterilization and disinfection devices includes the following steps:

[0016] Step S1: Turn on the induced draft fan and the plasma mechanism, and the plasma mechanism disinfects the clean room air drawn in from the air inlet.

[0017] Step S2: Turn on the humidification mechanism and the dehumidification mechanism, and simultaneously disinfect the air delivery pipe.

[0018] Step S3: Turn off the humidification mechanism and the dehumidification mechanism, and only disinfect the clean room air drawn in from the air inlet.

[0019] Step S4: Repeat steps S2 - S3 in a cycle to achieve intermittent disinfection of the air delivery pipe.

[0020] The technical solution provided by the embodiments of the present application has at least the following technical effects or advantages:

[0021] By separating the disinfection box from the filtration box and connecting them through an air duct, the active species ionized by the plasma mechanism in the disinfection box are dissolved into the water droplets generated by the humidification mechanism to form water mist with disinfection effect, so as to realize the sterilization and disinfection of the air duct, avoid the pollution of the clean room by the air duct, improve the disinfection effect of the clean room, extend the disinfection cycle, and improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0023] Figure 1 Schematic structural diagram of an embodiment of the present application;

[0024] Figure 2 Schematic structural diagram of the disinfection box of the embodiment of the present application;

[0025] Figure 3 Schematic structural diagram of the plasma mechanism of the embodiment of the present application;

[0026] Figure 4 Schematic appearance diagram of the plasma generator of the embodiment of the present application;

[0027] Figure 5 Schematic structural diagram of the plasma generator of the embodiment of the present application;

[0028] Figure 6 Schematic structural diagram of the filtration box of the embodiment of the present application.

[0029] Reference numerals in the drawings: 1, disinfection box; 11, air inlet; 2, air duct; 3, filtration box; 31, air outlet; 4, induced draft fan; 5, humidifying pipeline; 6, plasma mechanism; 61, mounting seat; 62, plasma generator; 621, housing; 622, cathode plate; 623, dielectric plate; 624, anode plate; 625, through hole; 626, copper pipe; 627, wire; 63, connecting pipe; 7, foam metal mesh; 8, filter element; 81, cover plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and the specific embodiments. Obviously, the described embodiments are only a 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 in no way constitutes a limitation to the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] As Figures 1-6 shown, a negative pressure sterilization and disinfection device for a clean room includes a disinfection box 1, an air delivery pipe 2, and a filtration box 3. Both the disinfection box 1 and the filtration box 3 are cylindrical shells. The air delivery pipe 2 is connected between the disinfection box 1 and the filtration box 3 to connect the disinfection box 1 and the filtration 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 air outlet 31 is provided at the right end of the filtration box 3. The air outlet 31 is installed at the lower part of the side of the clean room, and an induced draft fan 4 is installed at the air outlet 31. Driven by the induced draft fan 4, the air in the clean room passes through the disinfection box 1, the air delivery pipe 2, and the filtration box 3 in sequence and then returns to the clean room, realizing the sterilization, disinfection, and filtration of impurities of the air in the clean room. Preferably, the filtration box 3 can also be connected to a fresh air system for inputting fresh air into the clean room.

[0033] As Figure 2 shown, a humidifying mechanism and a plasma mechanism 6 are installed in the disinfection box 1 from left to right in sequence. 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. During use, the humidifier conveys water mist into the disinfection box 1 through the humidifying pipe 5, and 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 and then passes through the plasma mechanism 6.

[0034] As Figures 2-5 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 that of the disinfection box 1 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 one side of the mounting seat 61 close to the air inlet 11. The plurality of mounting holes are arranged in an array or evenly distributed in 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 towards the air inlet 11 direction to disinfect bacteria and viruses in the air, and at the same time, some organic pollutants in the air can also be decomposed to improve the air quality.

[0035] As Figure 4 、 Figure 5As shown in the figure, the plasma generator 62 includes a housing 621, a cathode plate 622, a dielectric plate 623 and an anode plate 624. The housing 621 is a cylindrical Teflon 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 housing 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 624 are fixed in a pyramid structure from top to bottom. Through holes 625 are coaxially formed in the centers of the cathode plate 622, the dielectric plate 623 and the anode plate 624. The through holes 625 penetrate the housing 621, and the diameter of the through holes 625 is 1 mm. A copper pipe 626 is fixed on the cathode plate 622. The copper pipe 626 is coaxially arranged with the through hole 625. The upper end of the copper pipe 626 is connected to a high-pressure air 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 pipe 626 and the wire 627 are electrically connected to a voltage regulator.

[0036] During use, high-pressure air is blown into the through hole 615 through the copper pipe 626, and an alternating voltage of 500 v is applied between the two electrodes through the copper pipe 626 and the wire 627. Discharge will occur in the gap between the electrodes, and a plasma jet of 23 mm will be ejected.

[0037] 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 to increase the facing area between the cathode plate 622 and the anode plate 624, which is beneficial to the ionization of the air in the through hole 625.

[0038] As Figure 6 shown in the figure, a dehumidifying mechanism and a filter element 8 are sequentially installed in the filter box 3 from left to right. The dehumidifying 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. The cooling pipe is connected to a circulating cooler for cooling the foam metal mesh 7 to dehumidify the air in the air duct 2.

[0039] The filter element 8 is of a cylindrical structure. The filter element 8 is coaxially installed at the air outlet 31. A cover plate 81 is installed at the left end of the filter element 8 so that air flows out from the filtering surface of the filter element 8. Preferably, an ultraviolet sterilization lamp (not shown) is installed inside the filter element 8 to sterilize the inner wall of the filter element 8 to avoid the enrichment of bacteria and viruses on the filter element 8.

[0040] Example 2

[0041] A sterilization method using the cleanroom negative pressure sterilization and disinfection device in Embodiment 1, comprising the following steps:

[0042] Step S1: Turn on the induced draft fan and the plasma mechanism. The air in the cleanroom enters the disinfection chamber from the air inlet. The plasma mechanism ionizes to generate electrons, and nitrogen and oxygen in the air collide with the electrons, reacting to generate nitrogen oxides and ozone to disinfect the cleanroom air drawn in from the air inlet.

[0043] Step S2: After the induced draft fan operates for a period of time, turn on the humidification mechanism and the dehumidification mechanism. The nitrogen oxides and ozone generated by the ionization of the plasma mechanism react with water to generate nitrite ions, nitrate ions, and hydrogen peroxide, and are transmitted along the air duct with the water mist to achieve the disinfection of the air duct.

[0044] Step S3: After the humidification mechanism and the dehumidification mechanism operate for a period of time, turn off the humidification mechanism and the dehumidification mechanism, and only disinfect the cleanroom air drawn in from the air inlet to avoid excessive humidity affecting the humidity in the cleanroom.

[0045] Step S4: Repeat steps S2 - S3 in a cycle to achieve intermittent disinfection of the air duct. Among them, before the negative pressure sterilization and disinfection device is shut down, the humidification mechanism and the dehumidification mechanism need to be turned off for at least 30 minutes to avoid water mist remaining in the air duct and causing corrosion of the air duct.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0047] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. 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 negative pressure sterilization and disinfection device for a clean room, characterized in that, It includes a disinfection box and a filtration box. The disinfection box is communicated with the filtration box through an air delivery pipe. An air inlet is opened on the disinfection box, and an air outlet is opened on the filtration box. An induced draft fan is installed at the air outlet. A humidifying mechanism and a plasma mechanism are installed in the disinfection box, and a dehumidifying mechanism and a filter element are installed in the filtration box. The humidifying mechanism, the plasma mechanism, the dehumidifying mechanism, and the filter element are arranged in sequence along the air flow direction. The plasma mechanism includes a mounting seat and a plasma generator. The mounting seat is a hollow shell, and the mounting seat is fixed in the disinfection box through a connecting pipe. The size of the mounting seat is smaller than that of the disinfection box. A plurality of mounting holes are opened on one 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 surfaces of the plasma generators face the air inlet. The plasma generator is encapsulated in an insulating outer shell. The plasma generator includes 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. Through holes are coaxially opened on the cathode plate, the dielectric plate, and the anode plate, and the through holes penetrate through the outer shell. A metal tube is fixed on the cathode plate, and the metal tube is coaxially arranged with the through hole and is communicated with high-pressure air. A wire is installed on the anode plate, and the metal tube and the wire are electrically connected to a voltage regulator. 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 larger than the size of the through hole on the cathode plate.

2. The negative-pressure sterilization and disinfection device for a clean room according to claim 1, wherein, The humidifying mechanism includes a humidifier and a humidifying pipe. The humidifier is installed below the disinfection box, the humidifying pipe is vertically installed on the top of the humidifier, the upper end of the humidifying pipe extends into the disinfection box, and the upper end of the humidifying pipe is lower than the plasma mechanism.

3. The negative pressure sterilization and disinfection device for clean room 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; the diameter of the through hole is 0.5 - 1.5 mm.

4. A negative pressure sterilization and disinfection device for a clean room according to claim 1, wherein, The dehumidifying mechanism includes a cooling pipe and a foam metal mesh. The foam metal mesh is installed in the filtration box, the cooling pipe is communicated with a circulating cooler, and the cooling pipe is wound around the outside of the foam metal mesh.

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

6. The negative pressure sterilization and disinfection device for a clean room according to claim 1, wherein, An ultraviolet sterilization lamp is installed in the filter element.

7. A sterilization method for the cleanroom negative pressure sterilization and disinfection device according to any one of claims 1-6, characterized in that, It includes the following steps: Step S1: Turn on the induced draft fan and the plasma mechanism, and the plasma mechanism disinfects the clean room air drawn in from the air inlet. Step S2: Turn on the humidifying mechanism and the dehumidifying mechanism to simultaneously disinfect the air delivery pipe. Step S3: Turn off the humidifying mechanism and the dehumidifying mechanism, and only disinfect the clean room air drawn in from the air inlet. Step S4: Repeat steps S2 - S3 in a cycle to achieve intermittent disinfection of the air delivery pipe.

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