Disinfection device and disinfection method for hospital top-stretching breather pipe

Abstract

The invention discloses a disinfection device for a hospital top-extending breather pipe and a disinfection method of the disinfection device, and relates to the field of damping drainage systems, the technical scheme is that the disinfection device is arranged on the top-extending breather pipe and located on the pipe section above each H pipe, and the disinfection device comprises a sleeve arranged on the breather pipe in a sleeving mode; two ends of the sleeve are respectively connected with the top-extending breather pipe to form a closed reaction cavity; two lamp brackets are fixedly arranged in the sleeve, and ultraviolet lamp tubes are mounted on the two lamp brackets; an annular branch pipe is arranged at the lower part of the sleeve in a surrounding manner and is provided with a plurality of spray heads, and the spray heads are used for spraying sodium hypochlorite atomized liquid drops into the top-extending vent pipe, so that the sodium hypochlorite atomized liquid drops and aerosol containing pathogens in the pipe are subjected to a synergistic oxidation reaction under the irradiation of the vacuum ultraviolet lamp tube to realize disinfection. The method has the beneficial effects that the 185 nm vacuum ultraviolet lamp and the atomized sodium hypochlorite are adopted for synergism, and rapid inactivation of pathogen aerosol such as viruses and bacteria is achieved.

Description

Technical Field

[0001] This invention relates to the field of building drainage systems, and in particular to a disinfection device and method for a hospital roof vent pipe. Background Technology

[0002] In modern hospital buildings, drainage systems not only discharge sewage but also connect to the atmosphere via roof vents to balance air pressure within the drainage risers and prevent water seal disruption. However, this ventilation path also constitutes a potential transmission route for pathogens. Clinical studies have shown that flushing wards can generate large quantities of micron-sized aerosols containing bacteria and viruses (such as influenza virus, norovirus, and SARS-CoV-2). These aerosols enter the ventilation ducts with the drainage disturbance and migrate upwards along the roof vents, eventually being released into the outdoor environment. In high-density medical areas or during infectious disease outbreaks, these aerosols may spread through roof vents or even flow back to nearby windows or fresh air inlets due to building wind pressure, posing a risk of cross-infection within the hospital.

[0003] Currently, there is no mature and compliant end-point disinfection solution to address this issue. Conventional air disinfection technologies such as high-efficiency particulate air (HEPA) filtration, ultraviolet (UVC, 254 nm) irradiation, or chemical spraying are mostly suitable for enclosed ducts or indoor spaces, and are difficult to apply directly to building drainage and ventilation systems. On the one hand, the airflow in roof-mounted vents is characterized by its transient, low-speed, and unsteady-state nature—it only generates a brief airflow pulse during drainage and is almost static under normal conditions, resulting in extremely low efficiency for traditional disinfection devices that rely on continuous airflow. On the other hand, according to relevant standards such as the "Standard for Design of Building Water Supply and Drainage" (GB 50015), vents must be kept unobstructed throughout their entire length and must not have reduced diameters, valves, filters, or other components that increase resistance to ensure the normal operation of the drainage system and maintain the effectiveness of the water seal. Therefore, any equipment that intrudes into the pipe cavity, alters the flow path, or requires frequent maintenance is unlikely to meet the requirements of the project implementation. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a disinfection device and method for a hospital overhead ventilation tube.

[0005] The technical solution is as follows: the roof-mounted vent pipe is an exhaust pipe in the building drainage system that is parallel to the drainage riser, extends upward along the building, and opens to the atmosphere. The roof-mounted vent pipe is connected to the drainage riser through multiple H-pipes. A disinfection device is provided on the vent pipe above each H-pipe. The disinfection device includes a sleeve fitted on the vent pipe, and the two ends of the sleeve are respectively connected to the vent pipe to form a closed reaction chamber. Two lamp holders are fixedly installed inside the sleeve, and ultraviolet lamps are installed on the two lamp holders. The ultraviolet lamps are arranged along the axial direction of the sleeve, with their two ends respectively installed on the two lamp holders. A quartz tube is sleeved on the outside of the ultraviolet lamps. The sleeve is also provided with a cleaning mechanism for removing the deposits on the outer surface of the quartz tube, and a driving mechanism located outside the sleeve for driving the cleaning mechanism to work. The lower part of the sleeve is surrounded by an annular branch pipe, which is connected to the water supply pipe and has multiple nozzles on the side facing the inner cavity of the vent pipe. The nozzles are used to spray sodium hypochlorite atomized droplets into the vent pipe to achieve disinfection by synergistic oxidation reaction with the aerosol containing pathogens in the pipe under the irradiation of the vacuum ultraviolet lamp.

[0006] Preferably, the cleaning mechanism includes an annular inner drive ring located inside the sleeve, and a cleaning component is installed in the middle of the inner drive ring; Multiple first permanent magnets are fixedly disposed on the outer wall of the inner drive ring for magnetic coupling with the drive mechanism to transmit driving force.

[0007] Preferably, the cleaning assembly includes an annular upper plate and a lower plate, the upper plate being fixedly connected to the inner drive ring via a connecting plate, and a plurality of intermediate plates being disposed between the upper plate and the lower plate, one end of the intermediate plate being rotatably connected to the upper plate, and the other end being provided with a scraper facing the outer wall of the quartz tube; An arc-shaped groove is formed on the middle plate, and a guide post is fixedly installed on the lower plate. The guide post slides in the groove so that when the upper plate and the lower plate rotate relative to each other, the middle plate is driven to swing around the hinge point between the middle plate and the upper plate, thereby causing the scraper to move radially closer to or away from the outer wall of the quartz tube.

[0008] Preferably, the lower plate is connected to the connecting plate via two circumferentially arranged limiters. Each limiter includes a slidably fitted mandrel and a guide cylinder. One end of the mandrel is rotatably connected to the lower plate, and one end of the guide cylinder is rotatably connected to the adapter frame. A return spring is sleeved on the outer periphery of the guide cylinder, and one end of the return spring abuts against one end of the guide cylinder and one end of the mandrel.

[0009] Preferably, two stop arms are fixedly installed on the plate body of the lower plate, and a spring pin is provided at each end of each stop arm. The movable end of the spring pin is provided with an angle, and the angles of the two opposing spring pins are in opposite directions.

[0010] Preferably, the driving mechanism includes a rack that is vertically fixed to the building wall or drainage riser; The outer circumference of the sleeve is fitted with an axially sliding sleeve, and a drive motor is mounted on the sliding sleeve. The output shaft of the drive motor is connected to a drive gear to drive a drive component rotatably mounted on the sliding sleeve to rotate.

[0011] Preferably, the upper end face of the driving member is provided with end face teeth, and the end face teeth mesh with the driving gear; The outer periphery of the active component is provided with a spiral guide, which meshes with the rack. When the active component rotates, it can move up and down along the rack, thereby driving the sliding sleeve and the internal cleaning assembly to move axially synchronously.

[0012] Preferably, the inner wall of the active component has a plurality of second permanent magnets distributed circumferentially, and the first permanent magnets and the second permanent magnets are aligned with opposite poles along the circumferential direction to form a non-contact magnetic coupling, so as to transmit the rotational motion of the active component to the cleaning assembly.

[0013] A method for disinfecting a hospital overhead ventilator includes the following steps: S1. Monitor whether a drainage event occurs in the drainage branch pipe connected to the vent pipe. S2. When a drainage event is detected, the ultraviolet lamp is activated and sodium hypochlorite solution droplets are sprayed into the vent pipe. S3. Sodium hypochlorite droplets and pathogen-containing aerosols in the tube undergo a synergistic oxidation reaction under vacuum ultraviolet light irradiation to disinfect the exhaust gas; S4. After completing a single disinfection operation, turn off the vacuum ultraviolet lamp and sodium hypochlorite solution supply, and the system returns to standby mode. S5. After the vacuum ultraviolet lamp tube has accumulated a preset cycle of operation, the cleaning mechanism is started to clean the outer surface of the quartz tube. After cleaning is completed, the tube is reset and put into standby mode.

[0014] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: The present invention uses a 185 nm vacuum ultraviolet lamp and atomized sodium hypochlorite in synergy to excite oxygen, water vapor and sodium hypochlorite with high-energy photons, generating strong oxidizing substances such as hydroxyl radicals (·OH), ozone and active chlorine radicals in situ, thereby achieving rapid, broad-spectrum and non-direct-view inactivation of pathogenic aerosols such as viruses and bacteria; it can complete efficient disinfection within seconds after a drainage event is triggered, and is energy-saving and precise; at the same time, the device does not invade the inner cavity of the vent pipe, fully complies with building drainage specifications, and integrates an automatic cleaning mechanism that does not require disassembly, ensuring long-term stable operation, and combining high efficiency, compliance and engineering practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the usage state of an embodiment of the present invention.

[0016] Figure 2This is a cross-sectional view of the overall structure of an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the driving mechanism and cleaning mechanism according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the cleaning mechanism according to an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the cleaning assembly according to an embodiment of the present invention. Figure 1 .

[0020] Figure 6 This is a schematic diagram of the cleaning assembly according to an embodiment of the present invention. Figure 2 .

[0021] The attached figures are labeled as follows: 1. Expansion vent pipe; 2. Drainage riser; 3. Sleeve; 4. Lamp holder; 5. Ultraviolet lamp tube; 6. Cleaning mechanism; 7. Drive mechanism; 8. Annular branch pipe; 9. Water supply pipe; 10. Inner drive ring; 11. Cleaning assembly; 12. First permanent magnet; 13. Upper plate; 14. Lower plate; 15. Intermediate plate; 16. Scraper; 17. Slide groove; 18. Limiter; 19. Stop arm; 20. Spring pin; 21. Rack; 22. Sliding sleeve; 23. Drive motor; 24. Drive gear; 25. Drive component; 26. End face teeth; 27. Spiral guide; 28. Second permanent magnet. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1 See Figures 1 to 6 This invention provides a disinfection device and method for a hospital roof vent pipe. The roof vent pipe 1 is an exhaust pipe in the building drainage system that is parallel to the drainage riser 2 and extends upward along the building to the atmosphere. The roof vent pipe 1 and the drainage riser 2 are connected by multiple H pipes. The drainage riser 2 and the roof vent pipe 1 achieve air pressure balance through several H pipes. The H pipes are set on some floors according to the building layout and drainage needs, and are not set on every floor. A disinfection device is installed on the top ventilation pipe 1 and on the pipe section above each H pipe. The disinfection device includes a sleeve 3 sleeved on the ventilation pipe. The two ends of the sleeve 3 are respectively connected to the top ventilation pipe 1 to form a closed reaction chamber. Furthermore, the installation density of this disinfection device can be configured differently according to the risk level of the building's functional areas. In hospital ward floors, especially in high-risk areas such as infectious disease isolation wards, ICUs, and respiratory departments, a disinfection device can be installed on the vent pipe of each floor, preferably at the section of the pipe above the H-pipe on that floor, so as to achieve immediate interception and inactivation of pathogenic aerosols generated by the drainage of this floor.

[0027] In general ward floors or low-risk areas such as administrative office areas and general clinic floors, considering the low sewage pollution load, a multi-story arrangement of one disinfection device can be adopted, for example, one device can be set up every 3 to 5 floors, installed above the top H pipe, in order to balance disinfection effect and construction cost.

[0028] This design ensures that the disinfection process takes place in a closed environment, preventing the leakage of harmful byproducts, while not affecting the original exhaust function of the ventilator. Since flushing the ward will disturb the liquid seal in the drainage pipe, tiny aerosols carrying viruses or bacteria may enter the ventilation pipe with the airflow and migrate upwards; therefore, the disinfection device of the present invention is installed on the top ventilation pipe 1 section above each H pipe to intercept and inactivate the aerosols on the spot before they spread to higher areas. Furthermore, the inner diameter of the cylindrical sleeve is slightly larger than the outer diameter of the overhead vent pipe, allowing the sleeve to accommodate internal components such as lamp holders, cleaning mechanisms, and quartz tubes, while ensuring that the original inner cavity of the overhead vent pipe remains completely unobstructed, without any necking or airflow obstruction.

[0029] Two lamp holders 4 are fixedly installed inside the sleeve 3. Ultraviolet lamp tubes 5 are installed on the two lamp holders 4. The ultraviolet lamp tubes 5 are arranged along the axial direction of the sleeve 3, and their two ends are respectively installed on the two lamp holders 4. A quartz tube is sleeved on the outside of the ultraviolet lamp tube 5. This vacuum ultraviolet lamp emits ultraviolet light with a wavelength of 185 nm when in operation. The choice of this wavelength is based on its unique photochemical properties: 185 nm ultraviolet light has high photon energy, which can be effectively absorbed by oxygen and water vapor molecules in the air, thereby generating highly reactive oxidizing substances such as atomic oxygen, ozone (O3), and hydroxyl radicals (·OH) in situ within the reaction chamber. These active ingredients can non-selectively oxidize and attack pathogens such as viruses and bacteria in aerosols, destroying their protein coats, lipid membranes, and genetic material, achieving highly efficient inactivation. When 185 nm ultraviolet light simultaneously irradiates atomized sodium hypochlorite droplets, it excites hypochlorite ions to undergo photolysis, generating reactive chlorine species such as chlorine radicals (Cl·) and hypochlorite radicals (ClO·). These substances synergistically interact with the aforementioned hydroxyl radicals and ozone to form a multi-pathway oxidation network, significantly enhancing the inactivation ability against highly resistant pathogens (such as non-enveloped viruses and bacterial spores). Experiments show that this synergistic system can achieve 4 log inactivation of typical aerosol model microorganisms within seconds to tens of seconds. 10 The above inactivation rate is far superior to conventional methods that use 254 nm UV lamps or chemical sprays alone.

[0030] To protect the lamp tube from moisture and contaminants, its outer sealing sleeve is equipped with a high-purity quartz tube, which has high transmittance to 185 nm ultraviolet light. The sleeve 3 is also provided with a cleaning mechanism 6 for removing the deposits on the outer surface of the quartz tube, and a drive mechanism 7 located outside the sleeve 3 for driving the cleaning mechanism 6 to work. Considering that the outer surface of the quartz tube may become dirty due to water vapor condensation or particle deposition after long-term operation, affecting the ultraviolet light transmission efficiency, this device is also equipped with a cleaning mechanism 6. The cleaning mechanism 6 is located inside the sleeve 3 and is arranged around the quartz tube. It can clean the outer wall of the quartz tube without disassembling the equipment. The cleaning mechanism 6 is driven by an external drive mechanism 7 through non-contact magnetic coupling, avoiding the need to open holes in the sleeve 3 and maintaining the airtightness of the reaction chamber.

[0031] The lower part of the sleeve 3 is surrounded by an annular branch pipe 8, which is connected to the water supply pipe 9 and has multiple nozzles on the side facing the inner cavity of the top ventilation pipe 1. The nozzles are used to spray sodium hypochlorite atomized droplets into the top ventilation pipe 1 so as to achieve disinfection by synergistic oxidation reaction with the aerosol containing pathogens in the pipe under the irradiation of the vacuum ultraviolet lamp.

[0032] Furthermore, to ensure that the sodium hypochlorite solution can be stably and uniformly atomized and sprayed, a water pump is integrated on each annular branch pipe 8. The water pump is connected to the water supply pipe 9 and is turned on synchronously by the control system when disinfection is started, so as to pressurize and deliver the sodium hypochlorite solution to the annular branch pipe 8, and then form fine droplets through multiple nozzles. When aerosols containing pathogens enter the reaction chamber with the airflow, 185 nm ultraviolet light irradiates the atomized sodium hypochlorite droplets and surrounding water vapor, generating in situ hydroxyl radicals ·OH, active chlorine radicals ClO·, and ozone, among other strong oxidizing substances. These active ingredients undergo rapid synergistic oxidation reactions with viruses and bacteria in the aerosols, achieving highly efficient inactivation and significantly reducing the biological risks of the emitted gases.

[0033] When a flushing event is detected in the ward drainage branch pipe, the system automatically activates the vacuum ultraviolet lamp and starts the sodium hypochlorite atomization spray for a period of time to complete one efficient disinfection cycle. After disinfection, the system automatically shuts down and enters standby mode. In addition, the cumulative running time or disinfection frequency threshold can be set. When the preset cycle is reached, the cleaning program is automatically started to maintain the quartz tube, ensuring long-term operational stability and disinfection efficiency.

[0034] The cleaning mechanism 6 includes an annular inner drive ring 10 located inside the sleeve 3, and a cleaning assembly 11 is installed in the middle of the inner drive ring 10. Multiple first permanent magnets 12 are fixedly arranged on the outer wall of the inner drive ring 10 for magnetic coupling with the drive mechanism 7 to transmit driving force.

[0035] The cleaning mechanism 6 is located inside the cylindrical sleeve 3 and is used to periodically clean the outer surface of the quartz tube in order to maintain the irradiation efficiency of the vacuum ultraviolet lamp tube. On the outer peripheral wall of the inner driving ring 10, a plurality of first permanent magnets 12 are uniformly fixed along the circumferential direction. When the external driving mechanism 7 works, the rotational or axial motion power of the driving mechanism 7 is transmitted to the moving parts inside the cleaning mechanism 6 through magnetic coupling, without the need to open a transmission hole or install a mechanical seal on the sleeve 3, thereby effectively ensuring the airtightness and structural integrity of the reaction chamber. Under the driving force transmitted by magnetic coupling, the cleaning component 11 can move or rotate along the axial direction of the quartz tube, causing the flexible scraping element on it to adhere to the outer wall of the quartz tube for cleaning. After cleaning, the cleaning component 11 automatically returns to the initial position to avoid blocking the ultraviolet light path during the normal disinfection process.

[0036] The cleaning assembly 11 includes an annular upper plate 13 and a lower plate 14. The upper plate 13 is fixedly connected to the inner drive ring 10 through a connecting plate, and a plurality of intermediate plates 15 are provided between the upper plate 13 and the lower plate 14. One end of the intermediate plate 15 is rotatably connected to the upper plate 13, and the other end is provided with a scraper 16 facing the outer wall of the quartz tube. An arc-shaped groove 17 is provided on the plate body of the intermediate plate 15, and a guide post is fixedly provided on the lower plate 14. The guide post slides in the groove 17 so that when the upper plate 13 and the lower plate 14 rotate relative to each other, the intermediate plate 15 is driven to swing around the hinge point between it and the upper plate 13, thereby causing the scraper 16 to move radially closer to or away from the outer wall of the quartz tube.

[0037] Furthermore, a guide groove is opened on the plate body of the lower plate 14, and the rotation axis of the middle plate 15 slides in the guide groove to constrain the movement trajectory of the lower plate 14 and ensure smooth and synchronous movement. In the initial state, the cleaning assembly 11 is located at the upper end of the quartz tube, the intermediate plate 15 is closed, and the scraper 16 is in contact with the outer wall of the quartz tube. When the cleaning program is started, the external drive mechanism 7 drives the cleaning assembly 11 to move downward along the quartz tube axis through magnetic coupling. During the downward movement, the scraper 16 continuously wipes the surface of the quartz tube to remove the attached deposits. When the cleaning assembly 11 moves to the lower end of the quartz tube, the scraper 16 automatically disengages from the surface of the quartz tube. This design ensures that the scraper 16 no longer contacts the quartz tube after cleaning, making it easy for the assembly to reset or enter standby mode. Subsequently, the drive mechanism 7 reverses its action or lifts the cleaning component 11 back to its initial upper position, preparing for the next cleaning cycle.

[0038] The lower plate 14 is connected to the connecting plate via two circumferentially arranged limiters 18. Each limiter 18 includes a slidingly fitted spindle and a guide cylinder. One end of the spindle is rotatably connected to the lower plate 14, and one end of the guide cylinder is rotatably connected to the adapter frame. A return spring is fitted around the outer periphery of the guide cylinder, with one end of the return spring abutting against one end of both the guide cylinder and the mandrel.

[0039] To ensure that the cleaning assembly 11 operates stably and is accurately positioned during operation, the lower plate 14 is connected to the connecting plate through two circumferentially symmetrically arranged limiters 18. When the lower plate 14 rotates under the action of external driving force, the spindle slides relative to the guide cylinder, compressing the return spring. When the external force is removed, the elastic force of the return spring pushes the spindle back to its original position, causing the lower plate 14 to rotate to the preset reference position. The core function of the limiter 18 is to maintain the stability of the lower plate 14 during the cleaning stroke. For example, before the cleaning begins, the limiter 18 can keep the middle plate 15 in a closed state and the scraper 16 close to the quartz tube. When the lower end is reached, the lower plate 14 is rotated by external force, and the limiter 18 can keep the middle plate 15 in an open state and the scraper 16 away from the quartz tube.

[0040] Two stop arms 19 are fixedly installed on the plate body located on the lower plate 14. Each stop arm 19 has a spring pin 20 at each end. The movable end of the spring pin 20 is set with an angle, and the angles of the two opposing spring pins 20 are in opposite directions.

[0041] To achieve automatic opening and closing control of the cleaning assembly 11 during axial movement, two symmetrically arranged stop arms 19 are fixedly installed on the outer periphery of the lower plate 14. Each stop arm 19 has a spring pin 20 installed at both ends. The spring pin 20 is supported by an elastic element, and its movable end extends towards the lamp holder 4, with a guide angle. The two spring pins 20 on the same stop arm 19 are arranged opposite each other, with their respective angles tilting in opposite directions, forming a pair of mechanical trigger structures with direction recognition capabilities.

[0042] When the cleaning assembly 11 continues to descend to the lower end of the quartz tube, the spring pin 20 on the stop arm 19 contacts the lower lamp holder 4. At this time, under the continuous action of the drive mechanism 7, the lower plate 14 is forced to rotate in the opposite direction relative to the upper plate 13, so that the scraper 16 automatically opens and detaches from the surface of the quartz tube, completing the cleaning process.

[0043] After cleaning, the drive mechanism 7 reverses, the cleaning assembly 11 moves upward to reset, and the spring pin 20 on the baffle arm 19 contacts the upper lamp holder 4. Under the continuous action of the drive mechanism 7, the lower plate 14 rotates in the opposite direction relative to the upper plate 13, so that the scraper 16 automatically closes and adheres tightly to the surface of the quartz tube, preparing for the next cleaning cycle.

[0044] The drive mechanism 7 includes a rack 21 that is vertically fixed to the building wall or the drainage riser 2; The outer periphery of the sleeve 3 is fitted with an axially sliding sleeve 22, and a drive motor 23 is mounted on the sleeve 22. The output shaft of the drive motor 23 is connected to a drive gear 24 to drive a drive member 25 rotatably mounted on the sleeve 22 to rotate.

[0045] The drive mechanism 7 adopts an external electromechanical transmission structure, which avoids opening holes in the sealed reaction chamber and ensures reliable execution of the cleaning action. The drive mechanism 7 includes a rack 21 that is fixed vertically to the wall, pipe well support, or outer wall of the drainage riser 2 along the building. The rack 21 is firmly installed by clamps or brackets, and its length covers the vertical travel range of the area where the disinfection device is located, serving as a guide and transmission reference for the axial movement of the cleaning component 11.

[0046] A sliding sleeve 22 that can slide freely along its axial direction is fitted around the outer periphery of the cylindrical sleeve 3; a drive motor 23 is fixedly installed on the sliding sleeve 22. The drive motor 23 is a small waterproof DC or stepper motor, and its output shaft is fixedly connected to the drive gear 24.

[0047] The upper end face of the driving component 25 is provided with end face teeth 26, which mesh with the driving gear 24; The outer periphery of the active component 25 is provided with a spiral guide 27, which meshes with the rack 21. When the active component 25 rotates, it can move up and down along the rack 21, thereby driving the sliding sleeve 22 and the internal cleaning assembly 11 to move axially synchronously.

[0048] A drive member 25 is rotatably connected to the lower end of the sliding sleeve 22. The drive member 25 can rotate around its own axis. The upper end face of the drive member 25 is provided with end face teeth 26, which mesh with the drive gear 24, thereby receiving rotational power from the drive motor 23. When the drive motor 23 starts, the drive gear 24 drives the drive member 25 to rotate; at the same time, the outer periphery of the drive member 25 is provided with a spiral guide 27, which meshes with the externally fixed vertical rack 21; since the rack 21 is stationary, the drive member 25 is forced to move along the axial direction of the rack 21 while rotating, thereby driving the entire sliding sleeve 22 and its internal related components to move up and down synchronously.

[0049] Multiple second permanent magnets 28 are distributed circumferentially on the inner wall of the active component 25. The first permanent magnet 12 and the second permanent magnet 28 are aligned with opposite poles along the circumferential direction to form a non-contact magnetic coupling, so as to transmit the rotational motion of the active component 25 to the cleaning assembly 11.

[0050] When the active component 25 rotates under the drive of the drive motor 23, the second permanent magnet 28 on its inner wall rotates accordingly. Since the first permanent magnet 12 and the second permanent magnet 28 are aligned with opposite poles in the circumferential direction, that is, the N pole of one magnet is facing the S pole of the other, a continuous magnetic attraction is generated between them, thereby realizing torque transmission without physical connection through the PVC pipe wall of the cylindrical sleeve 3.

[0051] Example 2 This embodiment provides a method for disinfecting a hospital ventilator, including the following steps: S1. Monitor whether a drainage event occurs in the drainage branch pipe connected to the vent pipe. S2. When a drainage event is detected, the ultraviolet lamp is activated and sodium hypochlorite solution droplets are sprayed into the vent pipe. S3. Sodium hypochlorite droplets and pathogen-containing aerosols in the tube undergo a synergistic oxidation reaction under vacuum ultraviolet light irradiation to disinfect the exhaust gas; S4. After completing a single disinfection operation, turn off the vacuum ultraviolet lamp and sodium hypochlorite solution supply, and the system returns to standby mode. S5. After the vacuum ultraviolet lamp has accumulated enough operation to reach the preset cycle, start the cleaning mechanism to clean the outer surface of the quartz tube. After cleaning is completed, reset and standby.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A disinfection device for a hospital roof-mounted vent pipe, wherein the roof-mounted vent pipe (1) is an exhaust pipe in a building drainage system that is parallel to the drainage riser (2) and extends upward along the building to the atmosphere, and the roof-mounted vent pipe (1) is connected to the drainage riser (2) through multiple H-pipes, characterized in that, A disinfection device is provided on the top ventilation pipe (1) and on the pipe section above each H pipe. The disinfection device includes a sleeve (3) sleeved on the ventilation pipe. The two ends of the sleeve (3) are respectively connected to the top ventilation pipe (1) to form a closed reaction chamber. Two lamp holders (4) are fixedly installed inside the sleeve (3). Ultraviolet lamp tubes (5) are installed on the two lamp holders (4). The ultraviolet lamp tubes (5) are arranged along the axial direction of the sleeve (3), and their two ends are respectively installed on the two lamp holders (4). A quartz tube is sleeved on the outside of the ultraviolet lamp tubes (5). The sleeve (3) is also provided with a cleaning mechanism (6) for removing the deposits on the outer surface of the quartz tube, and a drive mechanism (7) located outside the sleeve (3) for driving the cleaning mechanism (6) to work. The lower part of the sleeve (3) is surrounded by an annular branch pipe (8), which is connected to the water supply pipe (9) and has multiple nozzles on one side facing the inner cavity of the top ventilation pipe (1). The nozzles are used to spray sodium hypochlorite atomized droplets into the top ventilation pipe (1) to achieve disinfection by synergistic oxidation reaction with the aerosol containing pathogens in the pipe under the irradiation of the vacuum ultraviolet lamp.

2. The disinfection device for a hospital roof ventilation pipe according to claim 1, characterized in that, The cleaning mechanism (6) includes an annular inner drive ring (10) located inside the sleeve (3), and a cleaning component (11) is installed in the middle of the inner drive ring (10). Multiple first permanent magnets (12) are fixedly arranged on the outer wall of the inner drive ring (10) for magnetic coupling with the drive mechanism (7) to transmit driving force.

3. The disinfection device for a hospital roof ventilation pipe according to claim 2, characterized in that, The cleaning assembly (11) includes an annular upper plate (13) and a lower plate (14). The upper plate (13) is fixedly connected to the inner drive ring (10) via a connecting plate. A plurality of intermediate plates (15) are provided between the upper plate (13) and the lower plate (14). One end of the intermediate plate (15) is rotatably connected to the upper plate (13), and the other end is provided with a scraper (16) facing the outer wall of the quartz tube. An arc-shaped groove (17) is provided on the plate body of the intermediate plate (15). A guide post is fixedly provided on the lower plate (14). The guide post slides in the groove (17) so that when the upper plate (13) and the lower plate (14) rotate relative to each other, the intermediate plate (15) is driven to swing around the hinge point between itself and the upper plate (13), thereby causing the scraper (16) to move radially closer to or away from the outer wall of the quartz tube.

4. The disinfection device for a hospital roof ventilation pipe according to claim 3, characterized in that, The lower plate (14) is connected to the connecting plate through two circumferentially arranged limiters (18). The limiters (18) include a slidingly fitted mandrel and a guide cylinder. One end of the mandrel is rotatably connected to the lower plate (14), and one end of the guide cylinder is rotatably connected to the adapter frame. A return spring is sleeved on the outer periphery of the guide cylinder, and one end of the return spring abuts against one end of the guide cylinder and one end of the mandrel.

5. The disinfection device for a hospital roof ventilation pipe according to claim 4, characterized in that, Two stop arms (19) are fixedly installed on the plate body of the lower plate (14). Each stop arm (19) has a spring pin (20) at each end. The movable end of the spring pin (20) is provided with an angle, and the angles of the two opposing spring pins (20) are opposite.

6. The disinfection device for a hospital roof ventilation pipe according to claim 2, characterized in that, The drive mechanism (7) includes a rack (21) that is fixed vertically to the building wall or drainage riser (2). The outer periphery of the sleeve (3) is fitted with a sliding sleeve (22) that can slide axially. A drive motor (23) is installed on the sliding sleeve (22). The output shaft of the drive motor (23) is connected to a drive gear (24) to drive a drive member (25) that is rotatably set on the sliding sleeve (22) to rotate.

7. The disinfection device for a hospital roof ventilation pipe according to claim 6, characterized in that, The upper end face of the driving component (25) is provided with end face teeth (26), and the end face teeth (26) mesh with the driving gear (24); The outer periphery of the active component (25) is provided with a spiral guide (27), which meshes with the rack (21). When the active component (25) rotates, it can move up and down along the rack (21), thereby driving the sliding sleeve (22) and the internal cleaning assembly (11) to move axially synchronously.

8. The disinfection device for a hospital roof ventilation pipe according to claim 7, characterized in that, The inner wall of the active component (25) is circumferentially distributed with a plurality of second permanent magnets (28). The first permanent magnet (12) and the second permanent magnets (28) are aligned with opposite poles along the circumferential direction to form a non-contact magnetic coupling so as to transmit the rotational motion of the active component (25) to the cleaning assembly (11).

9. A method for disinfecting a hospital overhead ventilation tube according to claims 1-8, comprising the following steps: S1. Monitor whether a drainage event occurs in the drainage branch pipe connected to the vent pipe. S2. When a drainage event is detected, the ultraviolet lamp is activated and sodium hypochlorite solution droplets are sprayed into the vent pipe. S3. Sodium hypochlorite droplets and pathogen-containing aerosols in the tube undergo a synergistic oxidation reaction under vacuum ultraviolet light irradiation to disinfect the exhaust gas; S4. After completing a single disinfection operation, turn off the vacuum ultraviolet lamp and sodium hypochlorite solution supply, and the system returns to standby mode. S5. After the vacuum ultraviolet lamp tube has accumulated a preset cycle of operation, the cleaning mechanism is started to clean the outer surface of the quartz tube. After cleaning is completed, the tube is reset and put into standby mode.

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