Wet-type purification and sterilization system and method for tail end of exhaust fan

Abstract

The invention relates to the technical field of sterilization systems, in particular to a wet-type purification and sterilization system and method for the tail end of an exhaust fan. According to the technical scheme, a chlorine-containing disinfectant is adopted as a sterilization disinfectant, and efficient sterilization, low-cost operation and simple and convenient maintenance are achieved through cooperation of an air system and a water system of the device. An air system of the device adopts an HDPE (High-Density Polyethylene) pipe, and sectional pressure reduction and atomization spraying are performed to ensure the sterilization effect; the disinfectant can be recycled, so that the operation cost is reduced. The air exhaust system has the advantages of high efficiency, safety, environmental protection and the like and is suitable for infectious disease hospitals.

Description

Technical Field

[0001] The present invention relates to the technical field of sterilization systems, and in particular to an exhaust fan terminal wet purification and sterilization system and method. Background Art

[0002] In order to continuously improve the medical service system, accelerate the construction of specialized hospitals for infectious diseases, and enhance the ability to respond to major epidemics, the negative pressure ward is the core treatment area of ​​specialized hospitals for infectious diseases. The sterilization effect of the ventilation system of the negative pressure ward, especially the sterilization and purification device at the end of the exhaust fan of the exhaust system, is directly related to the life, health and safety of people outside the treatment area.

[0003] Traditional air purification equipment mostly uses physical adsorption, electrostatic adsorption, ultraviolet irradiation and other means to sterilize. When using physical adsorption and electrostatic adsorption, the filter will absorb a large amount of dust, particulate matter and bacteria, and needs to be cleaned and replaced frequently; when using ultraviolet irradiation, it is necessary to frequently check whether the ultraviolet lamp is operating normally. On the one hand, the above methods will increase the operating and maintenance costs; on the other hand, manual cleaning and replacement of filters or ultraviolet lamps during the use of the equipment are risky and can easily cause human infection; at the same time, improper handling of waste filters will also cause secondary pollution. Summary of the invention

[0004] The purpose of the present invention is to address the problems existing in the background technology and to propose a wet purification and sterilization system and method for the end of an exhaust fan.

[0005] On the one hand, the present invention provides an exhaust fan terminal wet purification and sterilization system, comprising:

[0006] Water and wind systems;

[0007] The water system consists of disinfectant supply pipes, disinfectant return pipes, disinfectant storage tanks and pressurizing equipment;

[0008] The wind system consists of a horizontal section and a vertical section. A HDPE pressure reducing orifice is installed at the inlet of the horizontal section of the wind system to reduce the wind speed and pressure of the air at the inlet of the device.

[0009] HDPE pressure reducing orifice plates are installed in sections in the vertical section of the air system, and atomizing spray heads are set between each section of HDPE pressure reducing orifice plates. The disinfectant is sprayed into the pipeline through the disinfectant supply pipeline by the pressurizing equipment;

[0010] The air that has completed the sterilization treatment is discharged through the exhaust port at the end of the air system pipe, and the disinfectant flows back to the disinfectant storage tank through the disinfectant return pipe.

[0011] Optionally, a recovery device is installed at the end of the air system pipeline, and the mist disinfectant condenses into water droplets through the recovery device and flows back to the disinfectant storage tank.

[0012] Optionally, the air system is connected to an air intake pipe, the air intake pipe is connected to a diverter box, and the recovery device includes two sets of recovery mechanisms installed on the diverter box.

[0013] Optionally, the recovery mechanism includes a connecting pipe fixedly mounted on the diversion box, a first valve group fixedly mounted on the connecting pipe, a one-way valve fixedly mounted on the first valve group, a recovery box fixedly mounted on the one-way valve, the recovery box is provided with an air inlet connected to the one-way valve and an air outlet, a second valve group fixedly mounted on the air outlet, and an expansion component for compressing the internal space of the recovery box is installed in the recovery box.

[0014] Optionally, the expansion assembly includes an elastic sealing cover installed inside the recovery box, elastic sealing plates are fixedly installed at both ends of the sealing cover, multiple rotating shafts are rotatably installed in the sealing cover, connecting rods are rotatably installed on the rotating shafts, and a push plate is rotatably installed on the other end of the connecting rod, and the push plate is fixedly connected to the sealing cover and slidably connected to the recovery box.

[0015] Optionally, the recovery box is provided with a driving assembly for driving the rotating shaft to periodically rotate in forward and reverse directions.

[0016] Optionally, the driving assembly includes a first half gear fixedly mounted on a rotating shaft, a second half gear and a third half gear rotatably mounted on a recycling box, the second half gear and the third half gear are both meshingly transmitted with the first half gear, a first gear is coaxially fixedly mounted on the second half gear, a second gear is fixedly mounted on the third half gear, the first gear and the second gear are meshingly transmitted, a motor is fixedly mounted on the recycling box, and the output shaft of the motor is coaxially fixedly connected to the first gear.

[0017] Optionally, a third valve group is fixedly installed at the bottom of the recovery box, and a U-shaped tube is fixedly installed at one end of the third valve group.

[0018] Optionally, a plurality of heat exchange tubes are fixedly installed in the recovery box, and the heat exchange tubes are connected to a water circulation system and a heat dissipation system.

[0019] On the other hand, the present invention provides a wet purification and sterilization method for the exhaust fan terminal, which is applied to the above-mentioned wet purification and sterilization system for the exhaust fan terminal, and the method comprises the following steps:

[0020] Step 1: spray the disinfectant into the pipeline through the disinfectant supply pipeline by means of a pressurized device;

[0021] Step 2: The air is decompressed and reduced in sections to form turbulence. Under the action of the atomized disinfectant, the air is sterilized and purified. The sterilized air is finally discharged through the end of the air system pipe.

[0022] Step 3: The recovery device converts the mist disinfectant entering the recovery box into water droplets and returns the disinfectant to the disinfectant storage tank.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] The present invention adopts chlorine-containing disinfectant and utilizes the strong oxidizing property of hypochlorous acid to effectively kill microorganisms and viruses in the air and prevent their spread;

[0025] Low-cost operation: The disinfectant can be recycled and only needs to be refilled or replaced regularly, which reduces the operating cost;

[0026] Easy installation and maintenance: The device has a simple structure, is easy to install, has low maintenance costs, and reduces the risk of manual cleaning and filter replacement;

[0027] Environmentally friendly and safe: It avoids the risks of secondary pollution and human infection caused by traditional physical adsorption and ultraviolet sterilization methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of a wet purification and sterilization system;

[0029] Figure 2 It is a schematic diagram of the structure of the recovery device;

[0030] Figure 3 It is a schematic diagram of the structure inside the connecting pipe;

[0031] Figure 4 is a schematic diagram of the structure of the expansion component;

[0032] Figure 5 A schematic diagram of the structure of the drive component.

[0033] Figure numerals: 1. disinfectant storage tank; 101. disinfectant supply pipeline; 102. HDPE pressure reducing orifice; 103. end of air system pipeline; 104. disinfectant return pipeline; 2. air inlet pipe; 201. diverter box; 3. connecting pipe; 301. first valve group; 302. one-way valve; 303. recovery box; 304. air inlet; 305. air outlet; 306. second valve group; 4. expansion assembly; 401. sealing cover; 402. sealing plate; 403. rotating shaft; 404. connecting rod; 405. push plate; 406. first half gear; 407. second half gear; 408. third half gear; 409. first gear; 410. second gear; 411. motor; 412. heat exchange tube; 5. third valve group; 501. U-shaped tube. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] like Figure 1 As shown, an exhaust fan terminal wet purification and sterilization system proposed by the present invention includes a water system and an air system.

[0036] Furthermore, the water system is composed of a disinfectant supply pipe 101, a disinfectant return pipe 104, a disinfectant storage tank 1 and a pressurizing device. The water system pipes are made of HDPE pipes and fittings, flanged, and the gaskets between the flanges are made of PVC gaskets. Chlorine-containing disinfectants are used as bactericidal disinfectants, and the strong oxidizing property of hypochlorous acid in the solution is utilized to make the microorganisms and viruses contained in the air discharged from the end of the negative pressure exhaust fan lose their functions and cannot reproduce or infect. Chlorine-containing disinfectants (such as 84 disinfectant) are used as bactericidal disinfectants. The disinfectants are low in cost and good in effect. Moreover, the water system of the device can be recycled and only needs to be regularly filled and replaced, which further reduces the operating cost.

[0037] Furthermore, the wind system includes a horizontal section and a vertical section. The wind system of the device adopts circular HDPE pipes and fittings. The cross-sectional area of ​​the wind system pipe is the same as the cross-sectional area of ​​the main pipe of the negative pressure ventilation system. The pipe is connected by flanges, and the gasket between the flanges adopts PVC gaskets. An HDPE pressure reducing orifice plate 102 is added at the entrance of the horizontal section of the wind system of the device to reduce the wind speed and wind pressure of the air at the entrance of the device and prevent the air containing disinfectant in the device from flowing back into the fan. An HDPE tee pipe is used at the connection between the horizontal section and the vertical section of the wind system of the device. A blind plate is added to the bottom of the tee pipe. The center opening of the blind plate is connected to the disinfectant return pipe, and the pipe adopts HDPE pipe.

[0038] like Figure 1 As shown, in this embodiment, HDPE pressure reducing orifice plates 102 are installed in vertical sections of the wind system, and atomizing spray heads are arranged between each section of the HDPE pressure reducing orifice plates 102. The disinfectant is atomized and sprayed in the pipeline through the disinfectant supply pipeline 101 by the pressurizing device. The air that has completed the sterilization treatment is discharged through the exhaust port 103 at the end of the wind system pipeline, and the disinfectant returns to the disinfectant storage tank 1 through the disinfectant return pipeline 104. The air in the pipeline of the wind system of the device is decompressed and reduced in sections to form turbulence. Under the action of the atomized disinfectant, the sterilization and purification effect is achieved. The air that has completed the sterilization treatment is finally discharged through the exhaust port at the end of the pipeline of the wind system of the device.

[0039] The outer wall of the device wind system pipe is insulated with 50mm thick B1 grade rubber-plastic insulation board, and the outer aluminum sheet is used to prevent direct sunlight from causing aging of the insulation layer. A rainproof wind cap is installed at the end of the device wind system outlet, and the height of the wind cap is required to be 1m higher than the roof parapet or the top elevation of the machine room.

[0040] like Figures 2 to 4As shown, this embodiment also includes a recovery device installed at the end 103 of the air system pipeline, and the mist disinfectant condenses into water droplets through the recovery device and flows back to the disinfectant storage tank 1. The air system is connected to an air inlet pipe 2, and the air inlet pipe 2 is connected to a diverter box 201. The recovery device includes two sets of recovery mechanisms installed on the diverter box 201. Through the alternating operation of the two sets of recovery mechanisms, the gas at the end 103 of the air system pipeline can be continuously extracted and discharged.

[0041] Furthermore, the recovery mechanism includes a connecting pipe 3 fixedly installed on the diversion box 201, a first valve group 301 is fixedly installed on the connecting pipe 3, a one-way valve 302 is fixedly installed on the first valve group 301, a recovery box 303 is fixedly installed on the one-way valve 302, the recovery box 303 is provided with an air inlet 304 connected to the one-way valve 302 and an air outlet 305, a second valve group 306 is fixedly installed on the air outlet 305, and an expansion component 4 is installed in the recovery box 303 for squeezing the internal space of the recovery box 303. When the expansion component squeezes the space inside the recovery box 303, the air pressure inside the recovery box 303 will increase, and the one-way valve 302 can prevent the gas inside the recovery box 303 from flowing back to the end 103 of the air system pipe. At this time, closing the second valve group 306 can increase the pressure of the gas inside the recovery box 303. According to the ideal gas law, under constant temperature, increasing the pressure will lead to an increase in the density of gas molecules, thereby increasing the chances of collision and aggregation between molecules and promoting the formation of droplets.

[0042] Since the temperature of the gas will rise when the pressure is increased, a plurality of heat exchange tubes 412 are fixedly installed in the recovery box 303, and a water circulation system and a heat dissipation system are connected to the heat exchange tubes 412. The water circulation system and the heat dissipation system can make water circulate inside the heat exchange tubes 412 and keep the water temperature at a low state, so that the mist disinfectant can be effectively recovered through the expansion assembly 4 to prevent the disinfectant from escaping with the gas, which can effectively increase the recovery rate of the disinfectant.

[0043] Furthermore, the expansion assembly 4 includes an elastic sealing cover 401 installed inside the recovery box 303, and elastic sealing plates 402 are fixedly installed at both ends of the sealing cover 401. Multiple rotating shafts 403 are rotatably installed in the sealing cover 401, and connecting rods 404 are rotatably installed on the rotating shafts 403. A push plate 405 is rotatably installed on the other end of the connecting rod 404, and the push plate 405 is fixedly connected to the sealing cover 401 and slidably connected to the recovery box 303. The rotating shafts 403 can drive the multiple connecting rods 404 to rotate, and the rotating connecting rods 404 can push the push plate 405 to diffuse or shrink, thereby increasing or decreasing the volume of the sealing cover 401, and then the gas inside the recovery box 303 can be squeezed through the sealing cover 401.

[0044] The recycling box 303 is provided with a driving assembly for driving the rotating shaft 403 to rotate alternately in forward and reverse directions periodically. The driving assembly includes a first half gear 406 fixedly mounted on the rotating shaft 403, a second half gear 407 and a third half gear 408 rotatably mounted on the recycling box 303, the second half gear 407 and the third half gear 408 are both meshed with the first half gear 406 for transmission, a first gear 409 is coaxially fixedly mounted on the second half gear 407, a second gear 410 is fixedly mounted on the third half gear 408, the first gear 409 and the second gear 410 are meshed for transmission, a motor 411 is fixedly mounted on the recycling box 303, and the output shaft of the motor 411 is coaxially fixedly connected with the first gear 409. By driving the first gear 409 to rotate through the motor 411, the first gear 409 and the second gear 410 can be rotated in the opposite direction synchronously, and then the second half gear 407 and the third half gear 408 can be driven to rotate in the opposite direction synchronously. When the second half gear 407 is engaged with the first half gear 406, the first half gear 406 can drive the rotating shaft 403 to rotate forwardly. When the third half gear 408 is engaged with the first half gear 406, the first half gear 406 will drive the rotating shaft 403 to rotate in the opposite direction, thereby making the rotating shaft rotate forward and reverse periodically, thereby making the sealing cover 401 contract and expand periodically.

[0045] It is worth noting that the third valve group 5 is fixedly installed at the bottom of the recovery box 303, and a U-shaped tube 501 is fixedly installed at one end of the third valve group 5. When the gas inside the recovery box 303 is squeezed, the third valve group 5 is in a closed state, and when the sealing cover 401 is contracted, the third valve group 5 is opened, and the liquefied disinfectant will flow into the U-shaped tube 501, and the disinfectant inside the U-shaped tube 501 can seal the gas, thereby preventing gas leakage.

[0046] It should be noted that when using chlorine-containing disinfectants, chlorine-containing disinfectants may react with stainless steel. The main components of stainless steel are metals such as iron, chromium, and nickel, which can react with chlorine under certain conditions. The active chlorine component in chlorine-containing disinfectants (such as sodium hypochlorite) can react with the chromium element on the surface of stainless steel to generate chromium chloride, which may destroy the passivation film on the surface of stainless steel and cause corrosion. Therefore, the materials of the recycling agency should avoid using stainless steel and choose materials that will not react with chlorine-containing disinfectants, such as plastics, glass, etc.

[0047] The present invention proposes a wet purification and sterilization method for exhaust fan terminal, which is applied to the above exhaust fan terminal wet purification and sterilization system. The method comprises the following steps:

[0048] Step 1: spray the disinfectant into the pipeline through the disinfectant supply pipeline 101 by a pressurizing device;

[0049] Step 2: The air is decompressed and reduced in sections to form turbulence. Under the action of the atomized disinfectant, the air is sterilized and purified. The sterilized air is finally discharged through the end 103 of the air system duct.

[0050] Step 3: The recovery device converts the mist disinfectant entering the recovery box 303 into water droplets, and returns the disinfectant to the disinfectant storage tank 1.

[0051] The disinfectant is atomized and sprayed in the pipeline through the disinfectant supply pipeline 101 by a pressurizing device, and the sterilized air is discharged through the exhaust port 103 at the end of the air system pipeline, and the disinfectant is returned to the disinfectant storage tank 1 through the disinfectant return pipeline 104. It is only necessary to replace or increase the disinfectant regularly;

[0052] The motor 411 drives the first gear 409 to rotate, which can drive the second half gear 407 and the third half gear 408 to rotate in opposite directions synchronously, thereby causing the shaft to rotate forward and reverse periodically, thereby causing the sealing cover 401 to contract and expand periodically.

[0053] According to the ideal gas law, under constant temperature, increasing pressure will increase the density of gas molecules, thereby increasing the chances of mutual collision and polymerization between molecules and promoting the formation of droplets. Since the temperature of the gas will rise when the pressure is increased, a plurality of heat exchange tubes 412 are fixedly installed in the recovery box 303, and the heat exchange tubes 412 are connected to a water circulation system and a heat dissipation system. The water circulation system and the heat dissipation system can make water circulate inside the heat exchange tubes 412 and keep the water temperature at a low state, so that the mist disinfectant can be effectively recovered through the expansion assembly 4 to prevent the disinfectant from escaping with the gas, which can effectively increase the recovery rate of the disinfectant.

[0054] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A wet purification and sterilization system at the end of an exhaust fan, characterized in that: Water and wind systems; The water system is composed of a disinfectant supply pipeline (101), a disinfectant return pipeline (104), a disinfectant storage tank (1) and a pressurizing device; The wind system comprises a horizontal section and a vertical section. A HDPE pressure reducing orifice plate (102) is installed at the inlet of the horizontal section of the wind system to reduce the wind speed and wind pressure of the air at the inlet of the device. The vertical sections of the air system are segmented with HDPE pressure reducing orifice plates (102), and an atomizing spray head is arranged between each section of the HDPE pressure reducing orifice plates (102), and the disinfectant is atomized and sprayed into the pipeline through the disinfectant supply pipeline (101) by a pressurizing device; The air that has completed the sterilization treatment is discharged through the exhaust port at the end (103) of the air system pipe, and the disinfectant flows back to the disinfectant storage tank (1) through the disinfectant return pipe (104).

2. The exhaust fan terminal wet purification and sterilization system according to claim 1, characterized in that: A recovery device is installed at the end (103) of the air system pipeline, and the mist disinfectant condenses into water droplets through the recovery device and flows back to the disinfectant storage tank (1).

3. The exhaust fan terminal wet purification and sterilization system according to claim 2, characterized in that: The air system is connected to an air intake pipe (2), the air intake pipe (2) is connected to a diverter box (201), and the recovery device comprises two sets of recovery mechanisms installed on the diverter box (201).

4. The exhaust fan terminal wet purification and sterilization system according to claim 3, characterized in that: The recovery mechanism comprises a connecting pipe (3) fixedly mounted on the diverter box (201), a first valve group (301) fixedly mounted on the connecting pipe (3), a one-way valve (302) fixedly mounted on the first valve group (301), a recovery box (303) fixedly mounted on the one-way valve (302), an air inlet (304) connected to the one-way valve (302) and an air outlet (305) provided on the recovery box (303), a second valve group (306) fixedly mounted on the air outlet (305), and an expansion component (4) for compressing the internal space of the recovery box (303) installed in the recovery box (303).

5. The exhaust fan terminal wet purification and sterilization system according to claim 4, characterized in that: The expansion assembly (4) comprises an elastic sealing cover (401) installed inside the recovery box (303), elastic sealing plates (402) are fixedly installed at both ends of the sealing cover (401), multiple rotating shafts (403) are rotatably installed in the sealing cover (401), a connecting rod (404) is rotatably installed on the rotating shaft (403), and a push plate (405) is rotatably installed on the other end of the connecting rod (404), and the push plate (405) is fixedly connected to the sealing cover (401) and slidably connected to the recovery box (303).

6. The exhaust fan terminal wet purification and sterilization system according to claim 5, characterized in that: The recovery box (303) is provided with a driving assembly for driving the rotating shaft (403) to periodically rotate in a forward and reverse direction.

7. The exhaust fan terminal wet purification and sterilization system according to claim 6, characterized in that: The driving assembly comprises a first half gear (406) fixedly mounted on a rotating shaft (403), a second half gear (407) and a third half gear (408) rotatably mounted on a recovery box (303); the second half gear (407) and the third half gear (408) are both meshed with the first half gear (406) for transmission; a first gear (409) is coaxially fixedly mounted on the second half gear (407); a second gear (410) is fixedly mounted on the third half gear (408); the first gear (409) and the second gear (410) are meshed with each other for transmission; a motor (411) is fixedly mounted on the recovery box (303); an output shaft of the motor (411) is coaxially fixedly connected to the first gear (409).

8. The exhaust fan terminal wet purification and sterilization system according to claim 7, characterized in that: A third valve group (5) is fixedly mounted on the bottom of the recovery box (303), and a U-shaped tube (501) is fixedly mounted on one end of the third valve group (5).

9. The exhaust fan terminal wet purification and sterilization system according to claim 8, characterized in that: A plurality of heat exchange tubes (412) are fixedly installed in the recovery box (303), and the heat exchange tubes (412) are connected to a water circulation system and a heat dissipation system.

10. A method for wet purification and sterilization at the end of an exhaust fan, applied to the wet purification and sterilization system at the end of an exhaust fan as claimed in claim 9, the method comprising the following steps: Step 1: spraying the disinfectant into the pipeline through the disinfectant supply pipeline (101) by a pressurizing device; Step 2: The air is decompressed and reduced in sections to form turbulence. Under the action of the atomized disinfectant, the air is sterilized and purified. The sterilized air is finally discharged through the end of the air system duct (103). Step 3: The recovery device converts the mist disinfectant entering the recovery box (303) into water droplets, and returns the disinfectant to the disinfectant storage tank (1).

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