Coaxial arrangement full air path purification and sterilization return type hand dryer

Abstract

The application discloses a kind of full airway purification sterilization of coaxial arrangement foldback hand dryer, it is related to hand dryer technical field, solve the secondary pollution of existing hand dryer, technical problems such as incomplete sterilization and purification, loud noise, structure is not compact.The core scheme is that air purification module, motor and impeller assembly, ultraviolet light catalyst air sterilization module are arranged coaxially in the shell inside along the axis, three modules are arranged at the both ends of motor assembly;Motor and impeller assembly divide the shell inner cavity into independent peripheral annular air inlet channel and central axial air outlet channel;Air inlet and air outlet are arranged at the end of shell close to air purification module, form full enclosed foldback airflow path.The application realizes 100% purification sterilization of full airway by coaxial arrangement and foldback air duct, completely eliminates secondary inhalation of germ aerosol, while greatly improves space utilization, reduces operating noise, optimizes motor heat dissipation, and is suitable for public toilet, commercial place and household scene.

Description

Technical Field

[0001] This invention relates to the field of hand dryer technology, and in particular to a high-speed hand dryer applicable to public restrooms, commercial venues and home settings. Background Technology

[0002] Hand dryers, as a contactless hand cleaning and drying device, are widely used in public restrooms, shopping malls, office buildings, hospitals and other places. Compared with traditional paper towels, they have the advantages of being energy-saving, environmentally friendly, contactless and convenient to use.

[0003] Existing hand dryers have the following main drawbacks:

[0004] 1. High risk of cross-contamination: Most existing hand dryers adopt an inlet and outlet design, or an inlet and outlet design with the same end but without a completely physical isolation structure of the airflow channel. When drying hands, the bacteria-laden water vapor and aerosol blown up by the high-speed airflow can be easily re-inhaled by the air inlet, forming a self-circulating pollution inside the machine. This can easily cause cross-infection, especially in densely populated places such as hospitals and shopping malls. Some hand dryers with HEPA filters have airflow bypass due to airflow channel design defects, which cannot achieve full airflow filtration and sterilization, and the purification effect is greatly reduced.

[0005] 2. Unreasonable duct structure, prominent contradiction between energy efficiency and noise: Existing hand dryers with straight-in and straight-out ducts require high-speed motors to achieve high-speed hand drying. During operation, the motor and wind noise are directly radiated outward, resulting in serious noise pollution. On the other hand, hand dryers with folding ducts often have problems with high wind resistance and severe airflow turbulence. They need to significantly increase the motor power to meet the wind speed requirements, resulting in low energy efficiency. At the same time, the motor heat dissipation effect is poor, and long-term high-load operation is prone to thermal decay, which shortens the service life of the whole machine.

[0006] 3. The layout of the sterilization module is unreasonable, resulting in low sterilization efficiency: The ultraviolet sterilization modules of existing hand dryers are mostly located at the air outlet, and the airflow residence time is extremely short, which cannot achieve an effective sterilization irradiation dose; at the same time, there is no pre-filter, and dust, hair and other impurities are easily attached to the surface of the ultraviolet lamp tube and photocatalyst carrier, which leads to a rapid decline in sterilization efficiency and makes maintenance and replacement extremely inconvenient.

[0007] 4. Poor structural compactness and weak installation adaptability: The purification module, sterilization module and motor components of existing hand dryers are mostly arranged in a staggered manner, resulting in low internal space utilization, large overall size, and large protrusion when wall-mounted, making it difficult to adapt to the small installation space of the bathroom. At the same time, the degree of modularity is low, making assembly and after-sales maintenance difficult. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing hand dryers, such as easy secondary pollution, incomplete sterilization and purification, high operating noise, low energy efficiency, and non-compact structure. It provides a coaxial, fully air-path purification and sterilization folding-back hand dryer. Through a coaxial, centrally located modular layout and a completely isolated folding-back air duct, it achieves closed-loop purification and sterilization of the entire air path, completely eliminating the secondary inhalation of bacteria-laden aerosols. At the same time, it also takes into account the compact structure, low-noise operation, efficient heat dissipation, and convenient maintenance.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A folding hand dryer with coaxial full-path purification and sterilization includes a housing. Inside the housing, an air purification module, a motor and impeller assembly, and an ultraviolet photocatalytic air sterilization module are arranged coaxially and centrally along its axis. The air purification module and the ultraviolet photocatalytic air sterilization module are respectively located at the front and rear ends of the motor and impeller assembly along its axis.

[0011] The motor and impeller assembly physically divides the inner cavity of the housing into an independent peripheral annular cavity and a central axial cavity with no crossflow gap. The peripheral annular cavity forms an annular air inlet channel extending along the axial direction, and the central axial cavity forms an air outlet channel that runs through the axial direction.

[0012] The outer casing has an air inlet and an air outlet at one end near the air purification module. The air inlet is directly opposite the air inlet side of the air purification module, and the air outlet is sealed and connected to the air outlet end of the air outlet channel.

[0013] The air inlet, air purification module, air inlet channel, ultraviolet photocatalytic air sterilization module, air outlet channel, and air outlet are sequentially connected to form a fully enclosed, reversible airflow path. This allows outside air to enter through the air inlet, be filtered by the air purification module, and then flow axially along the air inlet channel to the end of the outer shell near the ultraviolet photocatalytic air sterilization module. After being sterilized by the ultraviolet photocatalytic air sterilization module, the air enters the air outlet channel and finally flows axially back along the air outlet channel to be discharged through the air outlet.

[0014] Furthermore, the motor and impeller assembly includes a central sleeve, a high-speed brushless motor fixed inside the central sleeve, and an impeller drivenly connected to the output shaft of the high-speed brushless motor. The internal cavity of the central sleeve forms the air outlet channel, and the annular cavity between the outer wall of the central sleeve and the inner wall of the outer shell forms the air inlet channel. The air inlet side of the impeller faces the ultraviolet photocatalytic air sterilization module, and the air outlet side of the impeller faces the air outlet. The central sleeve achieves complete physical isolation between the air inlet and outlet channels, completely eliminating internal crossflow, while the coaxial arrangement ensures optimal dynamic balance of the motor and impeller, reducing vibration and noise.

[0015] Furthermore, the outer wall of the central sleeve, corresponding to the area of ​​the air inlet channel, is provided with an axially extending guide arc surface, and multiple sets of the guide arc surfaces are evenly and symmetrically distributed along the circumference of the central sleeve. The guide arc surfaces regulate the airflow within the air inlet channel, reducing airflow turbulence and wind resistance, improving fan efficiency, and reducing wind noise.

[0016] Furthermore, the outer casing includes a base and a protective cover that are interlocked and fixed together. The air inlet and the air outlet are both located on the bottom front wall of the protective cover. The air purification module, the motor and impeller assembly, and the ultraviolet photocatalytic air sterilization module are all fixedly installed on the base. The air purification module is detachably installed on the inner wall of the protective cover via a snap-fit ​​structure and is located downstream of the air inlet along the airflow direction, so that all the outside air entering the outer casing through the air inlet flows through the air purification module. The ultraviolet photocatalytic air sterilization module is fixedly installed at the air inlet end of the motor and impeller assembly and is located upstream of the air inlet along the airflow direction and downstream of the air purification module along the airflow direction, so that all the air filtered by the air purification module flows through the ultraviolet photocatalytic air sterilization module before entering the air outlet channel.

[0017] Furthermore, the ultraviolet photocatalytic air sterilization module includes an annular LED light panel assembly, a photocatalytic honeycomb plate, and a cover. The cover is a cylindrical structure with two through ends, and its internal cavity forms a straight sterilization airflow channel. One end of the cover is sealed and covered on the outer periphery of the air inlet end of the motor and impeller assembly. The photocatalytic honeycomb plate is fixedly installed at the opening at the other end of the cover. The annular LED light panel assembly is fixedly installed on the end face of the air inlet end of the motor and impeller assembly and extends annularly along the contour of the air inlet end. The annular LED light panel assembly is located at the rear end of the sterilization airflow channel along the airflow direction, and the photocatalytic honeycomb plate is located at the front end of the sterilization airflow channel along the airflow direction. The emitting surface of the annular LED light panel assembly faces the light-incident side of the photocatalytic honeycomb plate, and the emitting surface is parallel to the plate surface of the photocatalytic honeycomb plate and the two end faces of the cover. The geometric center of the annular LED light panel assembly, the geometric center of the photocatalytic honeycomb plate, and the geometric center of the cover are all coaxially aligned with the axial direction of the outer shell.

[0018] Furthermore, the assembly gap between the outer periphery of the photocatalytic honeycomb panel and the inner wall of the cover is filled with a sealing buffer layer, which not only achieves a complete seal of the sterilization airflow channel, avoids airflow bypass, and ensures that all air flows through the photocatalytic honeycomb panel, but also plays a buffering and shock-absorbing role, reducing the vibration and noise of the whole machine; the cover can be detachably and fixedly installed on the outer periphery of the air inlet end of the motor and impeller assembly by means of snap-fit ​​connection or threaded connection, which facilitates later maintenance and replacement.

[0019] Furthermore, the annular LED light panel assembly includes an annular aluminum substrate and UVC ultraviolet LED beads arrayed and welded to the side of the annular aluminum substrate facing the photocatalytic honeycomb plate. The peak wavelength of the UVC ultraviolet LED beads is 260nm-280nm, which is the deep ultraviolet band with the highest sterilization efficiency and can directly destroy the DNA and RNA structure of microorganisms. Multiple UVC ultraviolet LED beads are evenly arrayed along the circumference of the annular aluminum substrate to ensure no dead angle of irradiation. The annular aluminum substrate is fixed to the air inlet end face of the motor and impeller assembly by bolts, and efficient heat dissipation is achieved by utilizing the motor housing to extend the service life of the LED beads. The photocatalytic honeycomb plate includes an aluminum honeycomb substrate and a nano-titanium dioxide photocatalytic coating uniformly loaded on the entire surface of the aluminum honeycomb substrate. The honeycomb hole axis of the aluminum honeycomb substrate is parallel to the airflow direction of the sterilization airflow channel inside the cover, which reduces wind resistance and maximizes the contact area between air and the photocatalytic coating, thereby improving the photocatalytic sterilization efficiency.

[0020] Furthermore, an air collector nozzle is provided on the outer side of the air outlet end of the motor and impeller assembly. One end of the air collector nozzle is a circular interface that connects with the air outlet channel, and the other end is a flat air outlet. The circular interface end of the air collector nozzle is sealed and installed at the air outlet end of the motor and impeller assembly and is sealed and connected with the air outlet channel. The flat air outlet end of the air collector nozzle is sealed and inserted into the air outlet of the housing. The air collector nozzle gathers the airflow from the central air outlet channel into a high-speed flat jet, improving hand-drying efficiency, while simultaneously achieving a sealed connection between the air outlet channel and the air outlet to prevent airflow leakage.

[0021] Furthermore, a heating module is provided in the internal cavity of the air collector nozzle. The heating module is fixedly installed on the inner wall of the air collector nozzle, which can realize the function of hot air drying, adapting to the needs of low temperature environment use. At the same time, the heating module is set close to the air outlet, which greatly reduces heat loss and improves thermal efficiency.

[0022] Furthermore, a negative ion generator is also provided inside the outer casing. The negative ion release port of the negative ion generator is located near the air inlet and within the negative pressure suction range formed at the air inlet when the motor and impeller assembly are running. This allows the negative ions generated by the negative ion generator to be drawn into the air inlet channel by the negative pressure airflow at the air inlet, and then discharged from the air outlet after being processed sequentially by the airflow. This achieves the effect of air freshening and odor removal, further enhancing the user experience.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. Completely eliminate secondary pollution and achieve closed-loop purification and sterilization of the entire air path: This invention forms a triple protection mechanism by completely physically isolated air inlet and outlet channels, combined with the reverse flow field design at the same end of the air inlet and outlet, which completely eliminates the secondary intake of bacteria-laden water vapor and aerosol blown up when drying hands.

[0025] The aforementioned triple core mechanism completely eliminates secondary inhalation. This is achieved through a three-pronged synergistic mechanism: internal hard isolation to prevent cross-flow, external reverse flow field aerodynamic isolation, and aerosol inertial avoidance. This fundamentally blocks the secondary inhalation pathways of bacteria-laden water vapor and aerosols. Specifically:

[0026] 1. First layer: Complete physical isolation of the flow channels, eliminating internal crossflow and short-circuit circulation at the source.

[0027] This is the prerequisite for all effects; without complete physical isolation, co-location layout will only exacerbate contamination.

[0028] Structural implementation: The central sleeve of the motor assembly completely and physically divides the inner cavity of the outer shell into two closed flow channels that are not connected to each other: the outer annular cavity is an independent air inlet channel, and the central axial cavity is an independent air outlet channel. There is no connection gap between the two and no possibility of crossflow.

[0029] Core function:

[0030] Completely eliminate internal airflow short circuit: The exhaust airflow is completely enclosed in the central exhaust channel and can only be sprayed out from the exhaust port. It will never mix into the intake channel inside the body, thus structurally eliminating the possibility of "exhaust air being directly sucked back by intake air".

[0031] The inlet and outlet pressure fields are completely independent: the negative pressure of the inlet channel only acts on the inlet, and the positive pressure of the outlet channel only acts on the outlet. The two do not interfere with each other, and there will be no situation where the negative pressure zone draws the positive pressure air out, ensuring the absolute stability of the internal and external flow fields.

[0032] 2. Second layer: The reverse flow field design at the same end of the air inlet and outlet forms an aerodynamic isolation barrier, completely blocking the aerosol intake path.

[0033] This is the core innovation of the structure and the most fundamental difference from conventional solutions. It fully utilizes fluid dynamics to achieve spatial isolation between the contaminated zone and the intake zone.

[0034] Structural implementation: Both the air inlet and the air outlet are located on the bottom wall of the front of the unit (the downward wall facing the hand); the air inlet draws air vertically upward toward the inside of the unit, and the air outlet blows air vertically downward toward the user's hand, with the airflow directions of the two being completely opposite 180°.

[0035] Core flow field effect:

[0036] High-speed jets form an aerodynamic barrier: The air velocity at the air outlet of a hand dryer is typically ≥100m / s, creating a stable, high-speed, columnar jet. Based on the fluid dynamics ejection effect, the jet pulls the surrounding air downwards in sync, forming a continuous downward-facing annular airflow layer around the jet. This acts as an invisible "air wall," firmly confining the bacteria-laden aerosol to the hands / sink area below the jet, preventing it from spreading upwards.

[0037] The inhalation and splash directions are completely opposite, eliminating any possibility of inhalation: Under the impact of the high-speed jet, the bacteria-laden aerosol gains extremely strong downward momentum, fixing its movement direction downward and outward; while the inhalation direction at the air inlet is upward, making the two completely opposite. The negative pressure suction at the air inlet is simply unable to overcome the downward inertia of the aerosol, causing it to move 180° in the opposite direction and enter the air inlet.

[0038] The intake zone and the contaminated zone are completely spatially separated: the air inlet draws in uncontaminated indoor air from the upper part of the unit below; while bacteria-laden aerosols are confined to the lower hand / washbasin area by the high-speed jet. The two are completely spatially separated and do not overlap, thus avoiding the inhalation of bacteria-laden air at the source.

[0039] 3. Third layer: Inertial avoidance of aerosol motion characteristics further enhances the protective effect.

[0040] The bacteria-laden water vapor and aerosols generated when drying hands have particle sizes mostly concentrated in the range of 0.5-10μm and a mass much larger than that of air molecules. Under the impact of a high-speed jet of more than 100m / s, they will gain a great deal of downward inertial momentum, causing them to diffuse and settle directly downwards. They will be completely unable to enter the suction range of the air inlet, and their trajectory is highly directional, making it difficult for them to deflect 180° in the opposite direction.

[0041] Meanwhile, the fully enclosed reversible airflow path forces all intake air to pass 100% sequentially through the air purification module and the ultraviolet photocatalytic air sterilization module, without any airflow bypass, achieving full-path purification and sterilization, eliminating the risk of cross-contamination from the source, and is especially suitable for places with extremely high hygiene requirements such as hospitals and food factories.

[0042] 2. Maximizing space utilization with a highly compact overall structure: The three core functional components are arranged coaxially in the center, while the annular gap between the motor assembly and the outer casing serves as the air intake channel, and the central cavity serves as the air outlet channel, converting every inch of space inside the casing into an effective airflow path with no unused cavities; the folding flow channel achieves a design where the air intake and exhaust are at the same end, significantly reducing the axial installation size. When wall-mounted, it can significantly reduce the protrusion of the body, perfectly adapting to the small installation space of the bathroom, while also making the appearance simpler and more neat.

[0043] 3. Multiple noise reduction designs significantly reduce operating noise: The core noise source, the high-speed motor impeller, is completely enclosed in the center of the machine, surrounded by a ring-shaped air intake channel, functional modules at both ends, and the outer shell, forming a natural impedance composite sound-absorbing structure that greatly reduces noise radiation. The air purification module at the air intake is itself made of porous sound-absorbing material, which can directly attenuate the noise of the incoming air turbulence. The long-distance ring-shaped air intake channel can further eliminate wind noise through friction damping, while regulating airflow and reducing regenerated noise caused by fan intake turbulence. The coaxial and central arrangement ensures optimal dynamic balance of the motor impeller, minimizing vibration during high-speed rotation and avoiding resonance noise from the outer shell caused by eccentric arrangement.

[0044] 4. Significantly optimized motor heat dissipation and moisture protection performance, suitable for high humidity and high load scenarios: The annular air intake channel fully wraps around the central sleeve of the motor, and the dry and cold indoor air drawn in can provide 360° annular full-area cooling for the motor stator and housing, perfectly solving the pain point of high heat generation in high-speed brushless motors, greatly reducing motor thermal decay and extending the service life of the whole machine; at the same time, the dry airflow from the outer perimeter can continuously remove condensation from the inner wall of the housing, and the core electrical components are all wrapped in the central area, forming a dry air isolation layer on the outside, which significantly reduces the risk of electrical short circuits and component corrosion in high humidity environments.

[0045] 5. Modular design for easy assembly and maintenance: The three core components are coaxially integrated on the central frame, enabling modular pre-assembly. The entire assembly can be completed simply by inserting it into the outer shell, greatly improving production efficiency. The air purification module adopts a snap-on quick-release design, allowing users to disassemble and replace consumables themselves. The ultraviolet photocatalytic air sterilization module adopts a detachable cover structure, eliminating the need to completely disassemble the entire unit for after-sales maintenance, significantly reducing maintenance difficulty.

[0046] 6. Strong airflow isolation and high fan energy efficiency: The motor and impeller assembly naturally divide the cavity into two completely independent spaces for air intake and exhaust, completely eliminating cross-flow of air and hot air recirculation, avoiding ineffective internal consumption of fan pressure, and maximizing fan energy efficiency; at the same time, it adopts the scientific logic of filtering before sterilization, first intercepting large particulate pollutants through the air purification module, preventing impurities from blocking the ultraviolet lamp beads and contaminating the photocatalyst coating, greatly improving sterilization efficiency, and extending the service life of the sterilization module. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the axonal structure of a folding hand dryer;

[0048] Figure 2 This is a schematic diagram of the front structure of a folding hand dryer;

[0049] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure at point aa in the middle;

[0050] Figure 4 yes Figure 3 A magnified schematic diagram of the local structure at point A;

[0051] Figure 5 yes Figure 2 A schematic diagram of the cross-sectional structure at point bb;

[0052] Figure 6 This is a schematic diagram of the axial structure of a folding hand dryer (with the protective cover removed).

[0053] In the diagram: 1-Outer shell, 101-Base, 102-Shield, 103-Air inlet, 104-Air outlet, 2-Air purification module, 3-Motor and impeller assembly, 301-Central sleeve, 302-High-speed brushless motor, 303-Impeller, 304-Guide arc surface, 4-UV photocatalytic air sterilization module, 401-Casing, 402-Photocatalytic honeycomb panel, 403-Annular LED light panel assembly, 404-Sealing buffer layer, 405-Annular aluminum substrate, 406-UVC ultraviolet LED beads, 5-Air inlet channel, 6-Air outlet channel, 7-Air collector nozzle, 8-Heating module, 9-Negative ion generator. Detailed Implementation

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] This embodiment discloses a coaxially arranged, full-path purification and sterilization folding hand dryer, the overall structure of which is as follows: Figure 1-6 As shown, the core includes an outer shell 1, which consists of a base 101 and a protective cover 102 that are interlocked and fixed together. The overall structure is a square cavity, which is convenient for wall-mounted installation and suitable for small bathroom spaces.

[0056] Inside the outer casing 1, an air purification module 2, a motor and impeller assembly 3, and an ultraviolet photocatalytic air sterilization module 4 are arranged coaxially and centrally along its axis. The air purification module 2 is located at the front end of the outer casing 1 (the end closer to the hand during use), and the ultraviolet photocatalytic air sterilization module 4 is located at the rear end of the outer casing 1 (the end further away from the hand during use). The two are respectively located at the front and rear ends of the motor and impeller assembly 3 along its axis, and the geometric centers of the three are all coincident with the axial centerline of the outer casing 1 to ensure the overall motor balance.

[0057] The specific structure of the motor and impeller assembly 3 is as follows: Figure 3 , Figure 5 and Figure 6As shown, it includes a central sleeve 301, a high-speed brushless motor 302 fixed inside the central sleeve 301, and an impeller 303 that is drivenly connected to the output shaft of the high-speed brushless motor 302. The central sleeve 301 is a square-shaped cylindrical body with two through ends. A uniform annular gap is formed between its outer wall and the inner wall of the outer shell 1, thereby physically separating the inner cavity of the outer shell 1 into an independent peripheral annular cavity and a central axial cavity without crossflow gap. The peripheral annular cavity forms an annular air inlet channel 5 extending along the axial direction, and the internal cavity of the central sleeve 301 forms an air outlet channel 6 that extends along the axial direction.

[0058] Impeller 303 is a centrifugal impeller with its air inlet side facing the ultraviolet photocatalytic air sterilization module 4 (rear end of housing 1) and its air outlet side facing the air outlet 104 (front end of housing 1). When the high-speed brushless motor 302 drives the impeller 303 to rotate, a negative pressure is formed on the air inlet side of the impeller 303 and a positive pressure is formed on the air outlet side, providing power for airflow circulation.

[0059] The outer wall of the central sleeve 301 is provided with multiple sets of axially extending guide arc surfaces 304 in the area corresponding to the air inlet channel 5. The multiple sets of guide arc surfaces 304 are evenly and symmetrically distributed around the circumference of the central sleeve 301. The arc contour of the guide arc surface 304 is consistent with the airflow direction, which can effectively regulate the airflow in the air inlet channel 5, reduce airflow turbulence and wind resistance along the way, reduce wind noise, and improve the fan efficiency.

[0060] The bottom front wall of the protective cover 102 of the outer shell 1 is provided with an air inlet 103 and an air outlet 104. The air inlet 103 is a ring-shaped grille structure, which is arranged parallel to the air outlet 104. The air inlet 103 is directly opposite to the air inlet side of the air purification module 2. The air outlet 104 is sealed and connected to the air outlet end of the air outlet channel 6.

[0061] The air purification module 2 is a HEPA high-efficiency filter element with a ring structure that matches the shape of the air inlet 103. It can be detachably installed on the inner wall of the cover 102 through a snap-fit ​​structure and is located downstream of the air inlet 103 along the airflow direction. All the outside air entering the outer shell 1 through the air inlet 103 flows through the air purification module 2 without any bypass, ensuring that all intake air is filtered and intercepts pollutants such as dust, hair, and aerosols.

[0062] The specific structure of the ultraviolet photocatalytic air sterilization module 4 is as follows: Figure 4As shown, it includes an annular LED light panel assembly 403, a photocatalytic honeycomb plate 402, and a cover 401; the cover 401 is a cylindrical structure with both ends through, and its internal cavity forms a straight sterilization airflow channel; the front end of the cover 401 is detachably sealed to the outer periphery of the air inlet end of the motor and impeller assembly 3 through a snap-fit ​​structure, the photocatalytic honeycomb plate 402 is fixedly installed at the rear opening of the cover 401, and the annular LED light panel assembly 403 is fixedly installed on the end face of the air inlet end of the motor and impeller assembly 3 by bolts, and extends annularly along the contour of the air inlet end.

[0063] The annular LED light panel assembly 403 is located at the rear end of the sterilization airflow channel along the airflow direction, and the photocatalytic honeycomb plate 402 is located at the front end of the sterilization airflow channel along the airflow direction. The light-emitting surface of the annular LED light panel assembly 403 faces the light-incident side of the photocatalytic honeycomb plate 402, and the light-emitting surface is parallel to the plate surface of the photocatalytic honeycomb plate 402 and the two end faces of the cover 401. The geometric center of the annular LED light panel assembly 403, the geometric center of the photocatalytic honeycomb plate 402 and the geometric center of the cover 401 are all coaxially aligned with the axial direction of the outer shell 1 to ensure that there are no dead angles in ultraviolet irradiation and that the photocatalytic coating is uniformly illuminated.

[0064] The assembly gap between the outer periphery of the photocatalytic honeycomb panel 402 and the inner wall of the cover 401 is filled with a sealing buffer cotton layer 404, which not only achieves a complete seal of the sterilization airflow channel, preventing airflow from leaking from the assembly gap and ensuring that all air flows through the photocatalytic honeycomb panel 402, but also plays a buffering and shock-absorbing role, reducing the vibration and noise of the whole machine.

[0065] The annular LED light panel assembly 403 includes an annular aluminum substrate 405 and UVC ultraviolet LED beads 406 arrayed and welded to the side of the annular aluminum substrate 405 facing the photocatalytic honeycomb panel 402. The peak wavelength of the UVC ultraviolet LED beads 406 is 275nm, which is the deep ultraviolet band with the highest sterilization efficiency. Multiple UVC ultraviolet LED beads 406 are evenly arrayed around the annular aluminum substrate 405 to ensure uniform irradiation without dead angles. The annular aluminum substrate 405 is fixed to the air inlet end face of the motor and impeller assembly 3 by bolts. The motor housing can be used to achieve efficient heat dissipation, reduce the light decay of the LED beads, and extend their service life.

[0066] The photocatalytic honeycomb panel 402 includes an aluminum honeycomb substrate and a nano-titanium dioxide photocatalytic coating uniformly loaded on the entire surface of the aluminum honeycomb substrate. The honeycomb hole axis of the aluminum honeycomb substrate is parallel to the airflow direction of the bactericidal airflow channel inside the cover 401. While reducing wind resistance, it maximizes the contact area between air and the photocatalytic coating. When UVC ultraviolet light irradiates the photocatalytic coating, it generates highly oxidizing hydroxyl radicals, which can efficiently decompose organic pollutants in the air and kill bacteria and viruses, achieving a dual sterilization effect.

[0067] An air collector 7 is provided on the outside of the air outlet end of the motor and impeller assembly 3. One end of the air collector 7 is a circular interface that connects with the air outlet channel 6, and the other end is a flat air outlet. The circular interface end of the air collector 7 is sealed and installed at the air outlet end of the motor and impeller assembly 3 by a sealing rubber ring and is sealed and connected with the air outlet channel 6. The flat air outlet end of the air collector 7 is sealed and inserted into the air outlet 104 of the outer shell 1. It can gather the airflow of the central air outlet channel 6 into a high-speed flat jet with a wind speed of ≥100m / s, which greatly improves the hand drying efficiency and the hand drying time can be controlled within 10 seconds.

[0068] The internal cavity of the air collector nozzle 7 is equipped with an electric heating wire heating module 8. The heating module 8 is fixedly installed on the inner wall of the air collector nozzle 7 by a snap-fit, which can realize the function of hot air drying hands and adapt to the needs of use in low temperature environment in winter. At the same time, the heating module 8 is set close to the air outlet 104, which greatly reduces heat loss and improves thermal efficiency.

[0069] The inner side of the protective cover 102 of the outer shell 1 is also equipped with a negative oxygen ion generator 9. The negative oxygen ion release port of the negative oxygen ion generator 9 is located near the air inlet 103 and is located within the negative pressure suction range formed at the air inlet 103 when the motor and impeller assembly 3 are running. When the motor is running, the negative pressure airflow at the air inlet 103 can draw the negative oxygen ions generated by the negative oxygen ion generator 9 into the air inlet channel 5. After passing through filtration and sterilization treatment in sequence with the airflow, they are finally discharged from the air outlet 104, achieving the effect of fresh air and removing bathroom odors, further improving the user experience.

[0070] The working principle of this embodiment:

[0071] When the high-speed brushless motor 302 drives the impeller 303 to rotate, a negative pressure is formed on the air inlet side of the impeller 303. Under the action of the negative pressure, the outside air enters the outer casing 1 from the air inlet 103 at the front end of the cover 102.

[0072] The air first passes through the air purification module 2, which is directly opposite the air inlet 103. The HEPA filter intercepts large particulate pollutants such as dust, hair, and aerosols in the air, completing the first step of purification.

[0073] The filtered clean air enters the outer ring air inlet channel 5 and flows axially from the front end to the rear end of the outer shell 1, completely enveloping the central sleeve 301 and providing 360° ring cooling for the internal high-speed brushless motor 302.

[0074] After the airflow reaches the rear end of the outer shell 1, it enters the sterilization airflow channel of the ultraviolet photocatalytic air sterilization module 4. It first flows through the photocatalytic honeycomb plate 402, and then through the UVC ultraviolet irradiation area of ​​the ring LED light panel assembly 403. The UVC ultraviolet light directly kills bacteria and viruses in the air, and at the same time excites the photocatalytic coating to produce a photocatalytic reaction, further decomposing organic pollutants and killing microorganisms, thus completing the sterilization treatment of the entire air path.

[0075] The sterilized clean air is drawn into the air outlet channel 6 inside the central sleeve 301 by the negative pressure of the impeller 303, flows back from the rear end to the front end of the outer shell 1 along the axis, and finally converges into a high-speed jet through the air collector 7, and is sprayed out at high speed from the air outlet 104 to dry the hands.

[0076] In this embodiment, the air inlet channel 5 and the air outlet channel 6 are completely physically isolated by the central sleeve 301, with no crossflow gaps. Both the inlet and outlet are located at the front end of the outer shell 1. The air inlet 103 draws air upward, and the air outlet 104 draws air downward. The airflow directions of the two are completely opposite. The high-speed air jet forms an aerodynamic isolation wall, which firmly confines the bacteria-carrying aerosol to the hand area, completely avoiding the risk of secondary inhalation. At the same time, the closed-loop design of the entire air path ensures that all air is filtered and sterilized, resulting in excellent hygiene performance.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A folding hand dryer with coaxial arrangement, full airflow purification and sterilization, comprising a shell, characterized in that, Inside the outer casing, an air purification module, a motor and impeller assembly, and an ultraviolet photocatalytic air sterilization module are arranged coaxially and centrally along its axis. The air purification module and the ultraviolet photocatalytic air sterilization module are respectively located at the front and rear ends of the motor and impeller assembly along its axis. The motor and impeller assembly physically divides the inner cavity of the housing into an independent peripheral annular cavity and a central axial cavity with no crossflow gap. The peripheral annular cavity forms an annular air inlet channel extending along the axial direction, and the central axial cavity forms an air outlet channel that runs through the axial direction. The outer casing has an air inlet and an air outlet at one end near the air purification module. The air inlet is directly opposite the air inlet side of the air purification module, and the air outlet is sealed and connected to the air outlet end of the air outlet channel. The air inlet, air purification module, air inlet channel, ultraviolet photocatalytic air sterilization module, air outlet channel, and air outlet are sequentially connected to form a fully enclosed, reversible airflow path. This allows outside air to enter through the air inlet, be filtered by the air purification module, and then flow axially along the air inlet channel to the end of the outer shell near the ultraviolet photocatalytic air sterilization module. After being sterilized by the ultraviolet photocatalytic air sterilization module, the air enters the air outlet channel and finally flows axially back along the air outlet channel to be discharged through the air outlet.

2. The folding hand dryer according to claim 1, characterized in that, The motor and impeller assembly includes a central sleeve, a high-speed brushless motor fixed inside the central sleeve, and an impeller that is drivenly connected to the output shaft of the high-speed brushless motor; the internal cavity of the central sleeve forms the air outlet channel, and the annular cavity between the outer wall of the central sleeve and the inner wall of the outer shell forms the air inlet channel; the air inlet side of the impeller faces the ultraviolet photocatalytic air sterilization module, and the air outlet side of the impeller faces the air outlet.

3. The folding hand dryer according to claim 2, characterized in that, The outer wall of the central sleeve is provided with an axially extending guide arc surface in the area corresponding to the air inlet channel, and multiple sets of the guide arc surfaces are evenly and symmetrically distributed along the circumference of the central sleeve.

4. The reversible hand dryer according to claim 1, characterized in that, The outer casing includes a base and a cover that are interlocked and fixed together. The air inlet and the air outlet are both located on the bottom front wall of the cover. The air purification module, the motor and impeller assembly, and the ultraviolet photocatalytic air sterilization module are all fixedly installed on the base. The air purification module is detachably installed on the inner wall of the cover via a snap-fit ​​structure and is located downstream of the air inlet along the airflow direction, so that all the outside air entering the shell through the air inlet flows through the air purification module. The ultraviolet photocatalytic air sterilization module is fixedly installed at the air inlet end of the motor and impeller assembly, and is located upstream of the air inlet end along the airflow direction and downstream of the air purification module along the airflow direction, so that all the air filtered by the air purification module flows through the ultraviolet photocatalytic air sterilization module before entering the air outlet channel.

5. The folding hand dryer according to claim 2, characterized in that, The ultraviolet photocatalytic air sterilization module includes an annular LED light panel assembly, a photocatalytic honeycomb panel, and a cover. The cover is a cylindrical structure with two through ends, and its internal cavity forms a straight sterilization airflow channel. One end of the cover is sealed and covered on the outer periphery of the air inlet end of the motor and impeller assembly. The photocatalytic honeycomb panel is fixedly installed at the opening at the other end of the cover. The annular LED light panel assembly is fixedly installed on the end face of the air inlet end of the motor and impeller assembly and extends annularly along the contour of the air inlet end. The annular LED light panel assembly is located at the rear end of the sterilization airflow channel along the airflow direction, and the photocatalytic honeycomb plate is located at the front end of the sterilization airflow channel along the airflow direction. The light-emitting surface of the annular LED light panel assembly faces the light-incident side of the photocatalytic honeycomb plate, and the light-emitting surface is parallel to the plate surface of the photocatalytic honeycomb plate and the two end faces of the cover. The geometric center of the annular LED light panel assembly, the geometric center of the photocatalytic honeycomb plate, and the geometric center of the cover are all coaxially aligned with the axial direction of the outer shell.

6. The folding hand dryer according to claim 5, characterized in that, The assembly gap between the outer periphery of the photocatalytic honeycomb panel and the inner wall of the cover is filled with a sealing buffer layer; the cover can be detachably and fixedly installed on the outer periphery of the air inlet end of the motor and impeller assembly by means of snap-fit ​​connection or threaded connection.

7. The folding hand dryer according to claim 5, characterized in that, The annular LED light panel assembly includes an annular aluminum substrate and UVC ultraviolet LED beads arrayed and welded to the side of the annular aluminum substrate facing the photocatalytic honeycomb panel; the peak wavelength of the UVC ultraviolet LED beads is 260nm-280nm, and multiple UVC ultraviolet LED beads are evenly arrayed along the circumference of the annular aluminum substrate; the annular aluminum substrate is fixed to the air inlet end face of the motor and impeller assembly by bolts. The photocatalytic honeycomb panel includes an aluminum honeycomb substrate and a nano-titanium dioxide photocatalytic coating uniformly loaded on the entire surface of the aluminum honeycomb substrate; the honeycomb hole axis of the aluminum honeycomb substrate is parallel to the airflow direction of the bactericidal airflow channel inside the cover.

8. The folding hand dryer according to claim 2, characterized in that, An air collector nozzle is provided on the outside of the air outlet end of the motor and impeller assembly. One end of the air collector nozzle is a circular interface that connects with the air outlet channel, and the other end is a flat air outlet. The circular interface end of the air collector nozzle is sealed and installed on the air outlet end of the motor and impeller assembly and is sealed and connected with the air outlet channel. The flat air outlet end of the air collector nozzle is sealed and inserted into the air outlet of the housing.

9. The folding hand dryer according to claim 8, characterized in that, The air collector nozzle has a heating module inside its internal cavity, and the heating module is fixedly installed on the inner wall of the air collector nozzle.

10. The folding hand dryer according to claim 1, characterized in that, The housing is also equipped with a negative ion generator. The negative ion release port of the negative ion generator is located near the air inlet and within the negative pressure suction range formed at the air inlet when the motor and impeller assembly are running. This allows the negative ions generated by the negative ion generator to be drawn into the air inlet channel by the negative pressure airflow at the air inlet, and then discharged from the air outlet after being processed sequentially by the airflow.

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