Dryer and control system thereof

Abstract

A hand dryer includes a fan, a duct, at least one air knife driven by the fan, the air knife configured to direct air to dry one or more hands and to push water from the one or more hands into the duct, and at least one cyclonic device providing at least a partially annular path for the air and water from the hands.

Description

[0001] This application claims priority and benefit to U.S. Provisional Patent Application No. 63 / 278,372, filed November 11, 2021, and U.S. National Patent Application No. 17 / 975,077, filed October 27, 2022, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application generally relates to hand dryers. Background Technology

[0003] Hot air hand dryers have been around for over half a century. The major advancements in recent decades have been high-speed air jets, which can essentially dry hands in 10 to 15 seconds, even without added heat. This is achieved by the force of air stripping water from the skin, primarily mechanically rather than through evaporation. The energy, cost, and cleanliness of jet dryers compared to paper towels have been investigated, debated, and published in various articles. Both have unique advantages, and thus, both jet dryers and paper towels exist based on preference or bias. For example, some studies have shown that jet dryers are significantly less energy and less expensive than paper towels. In other cases, the initial cost of a jet dryer may be a barrier. Specific hygiene issues in hospitals or waste management issues in venues or small institutions may influence the decision to use a jet dryer or paper towels.

[0004] Recently, concerns about airborne microorganisms have intensified. The hygiene of jet dryers is debated because it's believed that high-speed air jets can separate microorganisms from surfaces and significantly increase bacterial circulation within a room. Research and publications differ on how to substantiate these concerns, but the possibility is real.

[0005] Most conventional devices deliver air jets vertically towards the hands, causing water and air to splash in all directions, including onto walls and the user. It's conceivable that this splashing could trigger biofilm formation and promote its growth on surfaces, while the air jets, deflected by the hands, could remove the biofilm. Furthermore, most air jets are delivered into the not-so-substantially-enclosed space of the washroom, thus increasing concerns about the spread of bacteria. Summary of the Invention

[0006] According to one aspect of the invention, an apparatus is provided comprising: a fan; a duct; at least one air knife configured to guide air from the fan and configured to dry one or more hands and push moisture from the one or more hands into the duct; and at least one cyclone device providing at least a partially detour path for the air and the moisture from the one or more hands.

[0007] According to another aspect of the present invention, a control system for operating a hand dryer is provided, the control system comprising: a sensor configured to generate sensor data for an object near the hand dryer; a timer configured to measure an elapsed time period; and a controller configured to operate a fan to move air through the hand dryer in response to the sensor data or the elapsed time period.

[0008] According to another aspect of the present invention, a hand dryer is provided, comprising: a left tubular cavity; a right tubular cavity; at least one first air knife angled toward the left tubular cavity; at least one second air knife angled toward the right tubular cavity; and an extension cavity connected to the left and right tubular cavities and configured to slow down airflow from the at least one first air knife and the at least one second air knife, wherein the extension cavity is configured to collect water droplets or particles suspended in the airflow. Attached Figure Description

[0009] Exemplary embodiments are described herein with reference to the following accompanying drawings.

[0010] Figure 1 An exemplary hand dryer is shown.

[0011] Figure 2A It shows the use of Figure 1 An example of a cyclone dryer.

[0012] Figure 2B It shows Figure 1 A top view of a hand dryer.

[0013] Figure 3A It shows the use of Figure 1 An example air knife for a hand dryer.

[0014] Figure 3B It shows the use of Figure 1 An example air knife for a hand dryer.

[0015] Figure 4A The position of the air knife relative to the hand dryer's tubing is shown.

[0016] Figure 4B and Figure 4C The position of the air knife relative to the horizontal plane is shown.

[0017] Figure 5A and Figure 5B Another embodiment of the hand dryer is shown.

[0018] Figure 6A and Figure 6B Another embodiment of the hand dryer is shown.

[0019] Figure 7 It shows Figure 6A and Figure 6B The cross-section of the hand dryer.

[0020] Figure 8A and Figure 8B Another embodiment of a hand dryer including an extended chamber is shown.

[0021] Figure 9 Another arrangement of the air knife for a hand dryer is shown.

[0022] Figure 10 Another arrangement of the air knife for a hand dryer is shown.

[0023] Figure 11A and Figure 11B Another arrangement of the air knife for a hand dryer is shown.

[0024] Figure 12A and Figure 12B An annular air duct with a vacuum source is shown for use in a hand dryer.

[0025] Figure 13A and Figure 13B Another embodiment of the hand dryer is shown.

[0026] Figure 14A and Figure 14B Another embodiment of the hand dryer is shown.

[0027] Figure 15A and Figure 15B Another embodiment of the hand dryer is shown.

[0028] Figure 16 An example of a hand dryer combined with a sink according to any embodiment of this document is shown.

[0029] Figure 17 It shows Figure 16 Example of a cross-sectional view.

[0030] Figure 18 Several hand dryers integrated with sinks according to any embodiment of this document are illustrated.

[0031] Figure 19 The integration of various hand dryers with sinks and cabinets according to any embodiment of this document is illustrated.

[0032] Figure 20 It shows the use of Figures 1 to 19 An exemplary controller for any dryer system in the example.

[0033] Figure 21 It shows Figure 20 An exemplary flowchart of the controller. Detailed Implementation

[0034] The following embodiments include a hand dryer (e.g., a hand dryer) comprising a tubular cavity and at least one air knife angled to enter the tubular cavity. The angle and orientation of the tubular cavity and the at least one air knife are arranged to apply one or more streams of air to a user's single hand. The at least one air knife may be provided vertically to apply air to the user's single hand in a "handshake" position. In this way, air is provided to both sides of the hand simultaneously. Some examples include a cyclone device in which air within the tubular cavity is swirled to remove water droplets, aerosols, or other particles. Particles may be pushed against the walls of the cyclone device, where they can be easily removed, disinfected, sterilized, or otherwise cleaned. The cyclone may be connected to an exhaust path to deliver air, water, aerosols, and other particles to another space (i.e., away from the user in the washroom). Other examples include an expansion chamber to slow airflow within the tubular cavity. These components are arranged in such a way that they operate with low power requirements to dry a user's single hand. Compared to similar hand dryers, this air dryer can use a smaller motor and fan. Furthermore, the vertical arrangement (the "handshake" position) allows for versatility in both the height of the air dryer (installation location) and the user's height.

[0035] Figure 1 An exemplary hand dryer or air dryer system 100 is shown, comprising at least one air knife 101 and a tubular cavity. The air knife 101 may include orifices 103 and a fan 110. Airflow generated by the fan 110 passes through a hollow portion of the air knife 101 that gradually tapers towards the orifices 103, increasing the airflow velocity. The fan 110 may produce a predetermined flow rate, such as 25 cubic feet per minute or greater. Alternatively, a series of orifices may be used instead of the orifices 103. The fan 110 may be separated from the air knife 101 by a hose or a sealed channel.

[0036] As an example of the operating principle of an air knife, when used in a manufacturing environment, an air knife can be mounted along a conveyor belt on which products or other objects are transported. The air knife emits a high-intensity, uniform, sheet-like laminar airflow to dry the object (i.e., mechanically peel or remove water from the object). In the accompanying embodiment, the air knife guides this uniform sheet (if it is a laminar airflow) onto an object (such as a user's hand held in the airflow). The hand can move in a specific pattern or direction (e.g., into the dryer, in a vertical plane, in a vertical plane and away from the user, in a vertical plane and into the dryer, in a direction perpendicular to the airflow, or other directions). Markings on the exterior of the hand dryer can indicate the user's specific pattern or direction.

[0037] The tubular cavity may include at least one cyclone device 102 or a cyclone device and a swirling air intake path between the air knives 101. Each side of the air intake path may be defined by a side wall 107 and a top wall 106. Thus, the air intake path may be defined on three sides, including two side walls 107 and a top wall 106. There may be open spaces or gaps between the lower portions of the air knives 101. It should be noted that in some embodiments, a bottom wall is not included. Figure 1 As shown, only one sidewall 107 on the left is shown, but a symmetrical sidewall 107 may also exist on the right. The sidewalls can be of different shapes and inclined in any direction. The cyclone device 102 or its associated housing can be secured to a wall or other structure by a bracket 108 using screws, bolts, or other fasteners. The space between the air blades 101 can be open at the bottom (i.e., not the bottom wall). This is because water is essentially prevented from dripping due to the orientation of the air blades. Any actual dripping water is allowed to fall freely, thus minimizing the possibility of any water accumulation or buildup. The cyclone device 102 may include drain outlets 115 (e.g., nozzles and / or plates) for collecting and / or draining water from the cyclone device 102. Additional, different, or fewer components may be included.

[0038] The tubular cavity may also be defined by an inlet plate 105 connecting the cyclone device 102 and the sidewall 107. The inlet plate 105 may be attached to the cyclone device 102 by fasteners or adhesives. One or more baffles 109 in the cyclone device (e.g., Figure 4A As shown, a cyclone inlet 104 can be formed. Air from the air knife 101 flows into the cyclone device 102 through the cyclone inlet 104.

[0039] Between the side walls 107 is a drying space where an object is placed between air blades 101 for drying. The object can be one or more of a user's hands. The hands can be positioned at a predetermined angle, guided by the shape and orientation of the drying space. The air blades 101 can be mounted at predetermined angles (e.g., predetermined angles in up to three directions or predetermined angles measured from any combination of three axes) that optimize or maximize the drying of the object. Driven by a fan 110, the air blades 101 direct air to dry one or more hands and push water from one or more hands into the tubular cavity.

[0040] The hand dryer 100 can be configured to dry only one hand at a time. The space between the air blades 101 can be narrow and sized for single-handed use. The air blades 101 simultaneously provide air jets to both sides of the single hand. In some examples, one hand is placed in the hand dryer 100 for a period of time, and then the other hand is placed in the hand dryer 100 for a period of time. In some embodiments, the system includes two hand dryers 100 with a comfortable distance between them so that the right hand is placed in the right-hand hand dryer while the left hand is placed in the left-hand hand dryer.

[0041] The shape and orientation of the hand dryer 100 are configured such that the exhaust gas emitted by the hand dryer 100 is captured by the cyclone separator 102 to separate water and slow the airflow away from the user. The orientation of the air blade 101 and the drying chamber allows the user's hand to be substantially extended, using ergonomic principles similar to a handshake. The orientation of the air blade 101 prevents water from splashing outside the hand dryer 100, as described by the disclosed embodiments.

[0042] The controller 10 can send commands, provide power to the fan 110, or otherwise operate the fan 110 to drive the air knife 101. The controller 10 can be coupled to a sensor 12. The sensor 12 is configured to generate sensor data of objects near the hand dryer. The sensor 12 can be a proximity sensor for detecting objects, such as a user's hand approaching the hand dryer. For example, the sensor 12 can detect a user's hand within a predetermined distance of the air knife 101 or within the drying space. The sensor 12 can detect another object or a gesture made by the user. In some examples, the sensor can include any type of sensor configured to detect certain actions. A proximity sensor can be used to detect the presence of an object within a detection area without requiring physical contact between the object and the sensor. Potential sensors, capacitive sensors, projected capacitive sensors, light detection and ranging (LiDAR), and infrared sensors (e.g., projected infrared sensors, passive infrared sensors) are non-limiting examples of proximity sensors that can be used in the systems of this application. Motion sensors can be used to detect motion (e.g., changes in the position of an object relative to its surroundings). Potential sensors, optical sensors, radio frequency (RF) sensors, sound sensors, magnetic sensors (such as magnetometers), vibration sensors, and infrared sensors (such as projected infrared sensors and passive infrared sensors) are non-limiting examples of motion sensors that can be used in the system of this application. In another example, the sensor may include a time-of-flight (ToF) sensor or a lidar sensor as a proximity sensor. Controller 10 receives and analyzes the sensor data to determine when a user approaches or has approached the hand dryer. In response to the analysis of the sensor data, controller 10 activates the air knife 101 and / or the fan 110. Mechanical buttons, switches, or sensors may be used instead of non-contact sensors.

[0043] Controller 10 may implement a timer or be coupled to timer 11. The timer may count the elapsed time period. This time period may be the amount of time before controller 10 indicates the fan to turn off, after the user's hand or other object has ceased to be detected by sensor 12. In one example, controller 10 may also turn off the fan if timer 11 reaches its maximum time limit since fan 110 was turned on.

[0044] In some examples, controller 10 activates the air knife 101 and / or fan 110 in response to sensor 12 detecting a user's hand, and deactivates the air knife and / or fan 110 in response to time elapsed after the user's hand is no longer detected. Therefore, controller 10 is configured to operate fan 110 to move air through the hand dryer in response to sensor data or an elapsed time period. Controller 10 can activate the fan in response to sensor data and deactivate the fan in response to an elapsed time period.

[0045] Controller 10 can operate in a low-flow mode to clean the air in a room. For example, even when there are no user's hands or objects in the dryer space, controller 10 can operate fan 110 to circulate air from the room into the hand dryer for any of the disinfection, sterilization, or cleaning techniques described herein. Controller 10 can initiate the low-flow mode at a predetermined time determined by timer 11 (e.g., at 2:00 AM or other overnight periods, or on weekends). Controller 10 can load a schedule or calendar for the low-flow mode. External buttons (e.g., user input device 355) are also available. Figure 20 This can trigger a low flow rate mode. In some examples, sensor 12 includes an air quality sensor, and controller 10 triggers a low flow rate mode in response to data from the air quality sensor.

[0046] Figure 2A It shows Figure 1 An exemplary cyclone 102 for a hand dryer. Air and water are driven through a tubular cavity and around the cyclone 102, which exerts force on the water, including aerosols or other particles, causing them to adhere to the outside of the cyclone 102. As discussed in detail below, these particles adhere to the radial surface of the cyclone 102.

[0047] In some examples, the cyclone 102 is covered or otherwise closed at the top, and air is exhausted through the bottom of the cyclone 102 (e.g., Figure 2A (As shown). In other examples, the bottom of the cyclone 102 is covered or otherwise sealed, and air is exhausted from the top of the cyclone 102. In other examples, both the top and bottom of the cyclone 102 can be ventilated, so that air can be exhausted from both the bottom. Additionally, or alternatively, the sides of the cyclone may include vents. These vents can direct air to another room, a wall, or a ventilation system.

[0048] Cyclone 102 may include two concentric channels, namely an inner channel 112 and an outer channel 113. Cyclone 102 may be formed of two cylinders such that the inner channel 112 passes through the interior of the inner cylinder, and the outer channel 113 passes between the inner and outer cylinders. Air enters the tubular cavity from an air knife 101 and passes through a partition 109 into the outer channel 113, as indicated by arrow A. One or more holes or windows 114 connect the outer channel 113 to the inner channel 112. As indicated by arrow B, air flows from the outer channel 113 through the window 114 into the inner channel 112. A gap G defines the height of the window 114 or the distance between the edge of the inner channel 112 and the end plate of the cyclone 102. The gap G can be varied to adjust the amount of air (e.g., flow rate or velocity) flowing from the outer channel 113 to the inner channel 112. As described below, the gap G and the associated flow rate can be selected based on sterilization techniques or other treatments applied to the air in the inner channel 112. As shown by arrow C, air flows through the inner channel 112 to the vent.

[0049] The inner cylinder forms a baffle, forcing airflow to at least partially circumnavigate the inner cylinder, causing air and water from the user's hands to flow in at least a partially annular path. The term annular can describe the cross-section of the inner and / or outer cylinder. The term annular can also describe an up-and-down or serpentine path through the inner and outer channels.

[0050] The inner cylinder forms a baffle, forcing airflow to at least partially surround the inner cylinder, causing air and water from the user to flow in at least a partially detour path. The term "detour" describes the change in direction from the inner cylinder to the outer cylinder. Other shapes besides cylindrical can also be used. That is, the cross-sections of the inner and outer cylinders can be rectangular, square, elliptical, or other shapes.

[0051] In addition, or as an alternative, other baffles, such as baffles in the radial or longitudinal direction relative to the inner cylinder, may be used. Other flaps, channels, labyrinths, or pathways may be included to ensure that the air path is long enough for water droplets and aerosols to be removed by centrifugal force. Particles expelled from the air and water adhere to the cyclone 102. In some examples, the inner surface of the cyclone 102 may be textured to promote adhesion. In some examples, moisture accumulating on the inner surface of the cyclone 102 facilitates adhesion.

[0052] Other structural examples for the cyclone 102 are possible, and may include additional concentric channels. Three channels, four channels, or more may be utilized. In some examples, these channels have different heights. That is, one channel may be a proportionate (e.g., half) the height of one or more other channels.

[0053] In one example, air flows from a duct into a first outer channel. Air enters the tubular cavity from air knife 101 and passes through baffle 109 into the outer channel as indicated by arrow A. From the outer channel, air enters a first inner channel through one or more windows or orifices. From the first inner channel, air enters a second inner channel through one or more windows or orifices. Any number of channels can be used. Channels can have various heights. Channels can have various relative diameters or widths. For example, the diameter of the first inner channel can be a predetermined proportion or percentage (e.g., 80%) of the outer channel, and the diameter of the second inner channel can be a predetermined proportion or percentage (e.g., 80%) of the first inner channel.

[0054] In some examples, the airflow from the duct first flows upward through the outer channel 113 into the inner channel 112 and then downward through the inner channel 112. In other examples, the airflow from the duct flows downward through the outer channel 113 into the inner channel 112 and then upward through the inner channel 112. In the case of three channels, the airflow can essentially proceed upward through the outer channel, downward through the first inner channel, and upward through the second inner channel. Alternatively, the airflow can proceed downward through the outer channel, upward through the first inner channel, and downward through the second inner channel.

[0055] Once aerosols or other particles adhere to the inner surface of the cyclone 102, one or more bactericides or bactericidal technologies are applied to the particles within the cyclone 102.

[0056] In one example, a light source, such as an ultraviolet (UV) light source, is installed in or adjacent to the cyclone device 102 via a window. UV light irradiates the inner wall. The UV light can have a predetermined frequency or wavelength, which may be a range of wavelengths or frequencies emitted by the light source. Sterilization irradiation can be optimized within a wavelength band of 200 to 280 nanometers (nm), and other examples may include 200 to 222 nm, 230 to 250 nm, 240 to 315 nm, or other ranges. One example wavelength could be 254 nm. The controller 10 can send commands to the light source to turn it on or off. The controller 10 can also send commands to the light source to set the wavelength of the light. The UV light sterilizes particles. The UV light can kill or eliminate living organisms (e.g., bacteria) and / or viruses adhering to the inner surface of the cyclone device 102 or otherwise contained within the cyclone device 102 (e.g., in a water mist). The UV light source can operate for at least 30 seconds after the user has finished using the hand dryer. Under heavy use, the ultraviolet light source can operate continuously. This option can be set by the building operator or by machine learning or other artificial intelligence (AI).

[0057] In one example, a liquid or suspended disinfectant can be sprayed or dispersed into the cyclone device 102. The disinfectant can be hydrogen peroxide (H₂O₂), chlorine, citric acid, electrolyzed water, or ozone (O₃). Hydrogen peroxide can be stored in a canister and refilled by the user or technical service personnel. Ozone can be generated by a corona charger that uses a high voltage to ionize the air inside or around the cyclone device 102, causing the air to decompose and become conductive. Corona discharge occurs when the potential gradient of the electric field around the charger is greater than the dielectric strength of the air. When using ozone, an ultraviolet (UV) decomposition stage can be optionally added after ozone treatment. A brief UV irradiation stage will decompose the ozone and reduce the amount of ozone escaping from the hand dryer.

[0058] The gap G between the outer channel 113 and the inner channel 112 can be set according to the type of processing. In one example, processing from ultraviolet light may be associated with a lower flow rate (larger gap G), while processing from spray or atomization may be associated with a higher flow rate (smaller gap G).

[0059] The controller 10 can operate a disinfectant dispenser configured to supply disinfectant to the cyclone unit 102. The dispenser may include nozzles or sprayers electronically driven by the controller 10. The controller 10 can also operate a charger to generate ozone within or near the cyclone unit 102.

[0060] The controller 10 can operate an ultrasonic transmitter to provide ultrasonic waves to the cyclone separator 102. The ultrasonic transmitter may include an ultrasonic atomizer or transducer that converts high-frequency sound waves into mechanical energy, which is transferred to the standing wave of the disinfectant liquid, thereby emitting a water mist or smoke.

[0061] The controller 10 can operate in a disinfection mode to release disinfectant into the hand dryer. The disinfection mode can occur after the drying mode. For example, the disinfection mode may be initiated by the controller 10 after a predetermined time has elapsed since the start of drying. During the disinfection mode, any of these technologies (e.g., ultraviolet light, ozone generation, disinfectant dispensing, ultrasonic generation) can be executed under the command of the controller 10. The disinfection mode can be executed periodically, or at predetermined times of day or on several days of week. The disinfection mode can be executed in response to sensor data (i.e., after the drying mode) and / or in response to an elapsed time period (i.e., a certain time after the start or end of the drying mode).

[0062] Figure 2B It shows Figure 1 A top view of a hand dryer. Figure 2B Cyclone 102 is shown behind air knife 101 and top wall 106. Cyclone 102 and air knife 101 can be fixed or adhered (e.g., glued) to top wall 106.

[0063] A predetermined distance, or dryer width W, defines the distance between the sidewalls 107 or between the centers of the air knives 101. This width W can be the width of the tubular cavity. This width defines the proximity of the air knives 101 and the corresponding air jets to one or more hands. The distance between the air knives 101 and one or more hands affects the speed and effectiveness of air removal of water from one or more hands. It is advantageous to allow the user to place one or more hands as close as possible to the air knives 101, while also providing sufficient space for relatively large hands and enough space for the user to easily avoid touching the sides of the tubular cavity. In several embodiments, a width is chosen for a single hand such that it is close to both air knives 101, but with sufficient distance for the user to maintain a comfortable distance between the air knives 101. The width W ranges from 2 inches to 4 inches or from 2.750 inches to 3.125 inches. An example of a selected width W could be 3 inches.

[0064] In any of the examples described herein, one or more filters may be included upstream of, within, and / or downstream of the hand dryer. Filters may be provided in addition to, or as an alternative to, the disinfection and sterilization technologies described herein. An upstream air filter may be coupled to a fan so that all air passing through the fan is filtered. A filter within the hand dryer may be upstream of the air knife 101, within a tubular cavity, or within the cyclone separator 102. A downstream filter may be located at the exhaust vent of the hand dryer. Any of these filters within the range of room air circulation may be a room filter configured to filter air near the device.

[0065] Any of these filters is configured to remove airborne particles. The filter can be a pleated mechanical air filter, such as a HEPA (High-Efficiency Particulate Air) filter. The filter can be a particle size-based separation filter. The filter may include activated carbon.

[0066] The filter can be an electrostatic separator. For example, an electrostatic aerosol collector provides static charge through voltage bias. This voltage can be low to avoid the risk of electric shock. In some embodiments, the electrostatic aerosol collector is charged by the physical properties of the material. In some embodiments, the electrostatic aerosol collector is charged by rubbing two parts together. To retain the static charge on the plastic sheet, insulation can be provided on the sides, edges, or corners. Insulation may include a non-conductive material between the plastic sheet and a wall or other device.

[0067] In any of these examples, the hand sanitizer dispenser 90 may be included alongside or connected to the hand dryer. The hand sanitizer dispenser 90 may be automatically (e.g., via electronic controls or proximity sensors from the hand dryer controller) or manually (e.g., via a button or gesture) to dispense sanitizer onto the user's hands. When automatically controlled, the hand sanitizer dispenser 90 may be actuated before, during, or after the fan 110 is actuated.

[0068] In the first example, controller 10 may receive sensor data indicating that a user is approaching or has approached the hand dryer, and controller 10 turns on the hand sanitizer dispenser 90 before turning on the air blade 101 and / or fan 110. In the second example, controller 10 may receive sensor data indicating that a user is approaching or has approached the hand dryer, and controller 10 turns on the hand sanitizer dispenser 90 simultaneously with turning on the air blade 101 and / or fan 110 (or simultaneously with approach within a predetermined time period). In the third example, controller 10 may receive sensor data indicating that a user is approaching or has approached the hand dryer, and controller 10 turns on the hand sanitizer dispenser 90 after turning on the air blade 101 and / or fan 110, after turning off the air blade 101 and / or fan 110, or after a predetermined time delay.

[0069] Figure 3A It shows the use of Figure 1 An example of an air knife 101 in a hand dryer, the air knife having a curved or angled orifice 103. The orifice 103 may have a predetermined width or air knife gap K. Examples of gap K may range from 0.01 to 0.05 inches. An example gap K is 0.03 inches. The size of the gap K affects the speed and force of the air. A smaller gap allows the air knife to have greater force, quickly stripping water from the hands. However, if the gap K is too small, the corresponding force is too high, and the air knife may feel too strong to the user.

[0070] Figure 3B It shows the use of Figure 1 An example of an air knife 101 for a hand dryer, the air knife 101 having a straight or linear orifice 103. The linear orifice 103 may also have a selectable or variable orifice 103 with a gap K. The gap K can be changed by adjusting a screw that brings one plate of the air knife 101 closer together or further apart from a second plate of the air knife 101.

[0071] Figure 4A A top view of the hand dryer is shown, including the position of the air knife 101 relative to the hand dryer's piping. For example, Figure 4AThe angle α1 of the air cutter orifice 103 is shown to be an acute angle relative to the sidewall 107, which may be aligned with the horizontal plane H. In one example, the angle α1 between the cutter orifice 103 and the horizontal plane can be in the range of 45 to 60 degrees. A specific example angle α1 could be 55 degrees. The angle α1 can be selected to maximize the amount of air directed into the hand dryer duct. When the angle α1 is too low, the convergence point of the airflow from the cutter orifice 103 is too far within the duct to effectively strip moisture from the same object (the user's hand). When the angle α1 is too high, the air may be deflected from the wrist of the hand. Higher angles may also cause resonance and vibration.

[0072] As the predetermined angle increases, the air knife 101 points more towards the tubular cavity to push air and water into the dryer, but exerts less direct drying force on the user's hand. The angle can be selected to maximize drying speed and effectiveness, as well as to force air and water into the dryer.

[0073] A predetermined angle (e.g., 55 degrees) serves to center the user's hand within the hand dryer. The airflow from the air blade 101 applies a generally balanced force to the user's hand. A shorter angle may result in a larger vertical force on the user's hand, tending to push the user's hand towards the side wall 107.

[0074] Figure 4B and Figure 4C The position of the air blade 101 relative to the horizontal plane is shown. The tilt angle of the air blade 101, or its angle relative to the horizontal plane, may affect the angle at which water is pushed away from the user's hand. When the angle relative to the horizontal plane is a first angle α2 (which can be substantially perpendicular, such as 90 degrees), the drying capacity may be maximized when the user moves their hand at a certain angle. When the angle relative to the horizontal plane is a second angle α3 (which can be an acute angle, such as 70 degrees), the drying capacity may be maximized when the user moves their hands up and down.

[0075] Figure 5A and Figure 5B Another embodiment of the hand dryer is shown. In this example, the air knife 101 is angled towards the front of the hand dryer 100, and the orifice 103 points inward to push air and water into the cyclone 102. In this example, a single structure (e.g., a molded or deformable material) is shaped into an integrated cyclone 102 and air duct, including at least one cyclone inlet 104 and at least one cyclone outlet 116. The cyclone outlet 116 may open to a space below the hand dryer 100. The cyclone outlet 116 may be connected to a pipe or duct to direct exhaust gas to a predetermined location. The cyclone outlet 116 may be vented to another room or into a heating or ventilation system.

[0076] Figure 5A and Figure 5B The vertical arrangement of the air blades 101 is further illustrated, allowing for a "handshake" orientation of one hand in the vertical plane, so that the two air blades 101 provide air jets to the hand. The air blades 101 are angled downwards, away from the user, and pointing inwards, so that water stripped from the hand is immediately pushed towards the cyclone separator 202. Because the air blades 101 are on either side of the hand, water does not "roll" from one side to the other. Instead, the water is pushed forward into the cyclone separator 102. Due to the vertical space for inserting one hand into the hand dryer 100, users of different heights, and even those who may need to reach overhead to reach the hand dryer 100, can comfortably place their hands in the vertical plane between the air blades 101. For similar reasons, the hand dryer 100 can be installed at different heights to accommodate all users.

[0077] Figure 6A , Figure 6B and Figure 7 Another embodiment of the hand dryer 100 is shown. Figure 7 It shows Figure 6A and Figure 6B The cross-section of the hand dryer. The hand dryer 100 of this embodiment may include any components of other embodiments described herein. The hand dryer may include a vertical space to operably dry one or both hands simultaneously. The hand dryer includes a housing 120 that includes one or more air jets 201, whose respective pressure chambers 203 are connected to a fan chamber 204. Air from the air jets 201 enters the drying chamber to dry the user's hands and then enters the cyclone separator 202. Additional, different, or fewer components may be used.

[0078] Reference Figure 6A The air jet 201 is angled to sweep across the hand as it enters and exits the drying chamber horizontally or vertically. Furthermore, the air jet 201 is directed towards the interior of the duct, away from the user. (See reference...) Figure 6B The air jet 201 is supplied by a regular fan that supplies pressure chamber 203. As the air jet is deflected from the hand, it is directed toward the inner wall, which divides the flow into two passages. Each passage is an inlet to cyclone separator 202.

[0079] Window 211 provides an optical path between fan chamber 204 and cyclone separator 202. Ultraviolet light source 210 can be installed near window 211. Ultraviolet light source 210 transmits ultraviolet light to cyclone separator 202 to sterilize air and water passing through the cyclone separator and received from the drying duct.

[0080] Reference Figure 7Airflow enters through a slot in cyclone component 202, and after swirling several times, exits through an opening facing the ground. Cyclone component 202 separates air and water, slowing the exhaust velocity. Cyclone component 202 has an upward-curved air outlet to capture water, which can be directed to a drain or collected in a container.

[0081] For example, a hand dryer can quickly dry objects using a high-speed air jet, but the motor can be smaller, resulting in less noise. Furthermore, the lower volumetric flow rate requirement reduces the movement of microorganisms. Additionally, the entire device can be smaller and less expensive.

[0082] Figure 8A and Figure 8B Another embodiment is shown, in which the hand dryer has a ducted design for simultaneously drying both hands. The hand dryer includes multiple air blades 131 arranged in multiple drying chambers 135 or ducts (e.g., a first chamber 135 for the left hand and a second chamber 135 for the right hand). The air blades 131 can be tilted inward (e.g., 55 degrees) into the chambers 135. The hand dryer includes a fan section 133 comprising a fan and a pressure chamber 132 pressurized by the fan to provide airflow to the air blades 131. Exiting from the drying chambers 135, air and any suspended water, aerosols, or other particles are supplied to an expansion chamber 137, the volume of which increases, slowing the flow.

[0083] for Figure 8A and Figure 8B The hand dryer is designed so that the hand is held vertically with the arm extended at a slight bend at the elbow. These ergonomic features accommodate users of all heights. The tubing is sized to accommodate hands larger than 99% of men. Each tubing delivers a high-speed jet of air to both sides of the hand. The air jets enter the tubing at an angle, ensuring sufficient pressure to impact the hand, removing water and further deflecting it into the tubing. This action eliminates water splashing back onto the user. The direction of the air jets or air blades 131 is controlled by nozzles in a pressure chamber 132, supplied by a conventional fan. After passing through the tubing, the air enters a much larger enclosed chamber (e.g., expansion chamber 137) to slow the flow. A diffuser 134 can be configured to diffuse the flow, separating air and water and further slowing the flow. The final outlet is directed downwards toward the floor, away from the user. The separated water can be collected and directed to a drain or container.

[0084] Figure 9Another arrangement of the air blades 101 for a hand dryer is shown. In this example, two air blades 101 can be arranged in parallel, one behind the other. A vacuum source 141 can draw air from the air blades 101 through the drying space into a tubular cavity. Hand dryers with two or more air blades 101 can dry faster, have greater drying power, utilize lower air velocities, generate less noise, and produce more suction treatment to protect the user. With individually controllable air blades, different speeds can be selected (e.g., low-speed air, high-speed air). The higher speed of the outer blade helps remove moisture from the skin, while the higher flow rate of the inner blade carries water droplets to the collection system.

[0085] Figure 10 Another arrangement of the air blades 101 for a hand dryer is shown. In this example, multiple (e.g., five) air blades 101 may be arranged at different angles and generally facing an interior point of the vacuum source 141.

[0086] Figure 11A and Figure 11B Another arrangement of the air blade 101 for a hand dryer is shown. The curved air blade 101 can be angled so that all parts of the air blade 101 point towards the vacuum source 141. The air blade can have a compound angle in the arc (approximately 30 degrees to the horizontal plane), and the air blade speed is 100 to 200 meters per second. The vacuum source 141 can include a flow rate of approximately 50 cubic feet per minute (CFM) and can reach or exceed the total flow rate of the air blade.

[0087] Figure 12A and Figure 12B An annular air duct 150 with a vacuum source 141 for a hand dryer is shown. One or more air blades 101 are installed at the inlet of the annular air duct 150. One or both hands of the user are placed at the inlet of the annular air duct 150. The annular air duct 150 provides an annular path for air, water, and suspended particles. Water can be collected in a collection device 142 at the bottom of the annular air duct 150. A drain outlet is provided to empty the collection device 142.

[0088] Figure 13A and Figure 13B Another embodiment of a hand dryer with a drying air source 160, an air curtain 162, and a wall 161 is shown. The air curtain 162 is a thin jet of air (e.g., provided by an air knife) that provides an air wall within the hand dryer. Figure 13A The air curtain 162 is shown positioned behind the user's hands and configured to flush bacteria, water, and other particles away from the user and towards the wall 161. The inner wall 171 can guide the air curtain 162.

[0089] Figure 13BThe air curtain 162 provides a vertical barrier between the user's hand and the wall 161. This prevents any water, bacteria, or other particles from being deflected when blown towards the wall 161. The air curtain 162 prevents bacteria from being blown away from the wall of the hand dryer.

[0090] Figure 14A and Figure 14B Another embodiment of a hand dryer coupled to a vacuum source 170 is shown. The vacuum source 170 can be positioned behind the hand (e.g., upstream of the opening 177), at a level substantially similar to that of the hand (e.g., at...). Figure 14A (as shown), and / or in any lower position in the hand-drying chamber (e.g., in the...) Figure 14B (As shown). In Figure 14A In this configuration, a vacuum source 170 is placed within wall 161 to draw air, water, bacteria, or other particles from the hand dryer and direct them into wall 161. These exhaust gases can then be vented outside the building, to another room, into a passageway within the wall, a ventilation system, or a designated chamber. Figure 14B In the middle, a vacuum source 170 downstream pulls air, water, bacteria, or other particles away from the user's hand and into the wall 161. The vacuum source 170 is configured to remove aerosols generated during hand drying. Additionally, or alternatively, a blower or fan may be located upstream of the chamber. Additional, different, or fewer components may be included.

[0091] Figure 15A and Figure 15B Another embodiment of the hand dryer 172 with various vacuum source positions is shown. Figures 15A-15B The embodiment includes dual conduits 173. Each conduit 173 corresponds to a different hand. The user's hand is inserted into the conduit via an air knife (i.e., deeper into the conduit 173 than the air knife). An exhaust conduit 174 provides a path for air, water, and aerosol blown away from the user's hand, allowing them to escape through the bottom of the hand dryer 172. The exhaust conduit 174 can vent into a space beneath the floor. The exhaust conduit 174 can be connected to a ventilation system. In some examples, each conduit 173 is connected to a separate exhaust path. In some examples, the conduits 173 are combined (connected) into a single exhaust path.

[0092] Figure 16 The hand dryer 100, according to any example herein, is shown mounted in conjunction with a sink 180 including one or more faucets 181 and drain outlets 188 and / or with a mirror 182. The hand dryer 100 may be mounted above the sink 180, but still provides open space 183 (e.g., for mopping, for the user's feet, wheelchairs, etc.). Additional, different, or fewer components may be included.

[0093] In this example, the operation of hand dryer 100 is associated with faucet 181. For example, faucet 181 can be actuated (e.g., turned on) by a proximity or motion sensor. Hand dryer 100 can be turned on after a predetermined time (e.g., 10 seconds, 20 seconds, 30 seconds). The predetermined time can be selected to encourage handwashing within that predetermined time.

[0094] Water dispensed by faucet 181 is drained through drain outlet 188. The drain of the hand dryer (e.g., drain outlet 115) can be fluidly coupled to drain outlet 188. Therefore, sink 180 and hand dryer 100 can be connected behind or below sink 180 by a T-structure or other connecting device.

[0095] Furthermore, the hand dryer 100 can be connected to an air venting device that passes through the wall behind the sink 180. Therefore, the hand dryer 100 includes a water discharge device and an air venting device that may be at least partially located in the sink 180 and / or the supporting wall.

[0096] Figure 17 It shows Figure 16 A cross-sectional view of an exemplary hand dryer 100. Figure 17 A cyclone separator 102 and / or housing 189 are shown mounted between faucets 181 in a sink 180. An air knife 101 may be mounted with housing 189 so that only an opening is visible. This opening may be tilted downwards and inwards to access the hand-drying duct of housing 189.

[0097] Figure 18 The integration of multiple hand dryers 100 with a sink 180 according to any embodiment of this document is illustrated. In this example, a single housing may support or be coupled to the sink 180 and the hand dryer 100. The housing may also support a faucet 181 and a soap dispenser 184. Legs or brackets 185 may provide ground support for the hand dryer 100 and the sink 180. A mounting member 186 may support the housing including the sink 180 and the hand dryer by being coupled to a wall. The mounting member 186 may be located between the wall and the housing supporting the sink 180. Multiple sinks 180 may be installed adjacent to each other. In some examples, each sink 180 is associated with a single-hand hand dryer 100 on each side. In some examples, a single-hand hand dryer 100 is shared between adjacent sinks 180. Additional, different, or fewer components may be included.

[0098] Figure 19Integration of multiple hand dryers 100 with a sink 180 and a cabinet 190 according to any embodiment herein is illustrated. Air exhaust devices from the hand dryers 100 may pass through the cabinet 190 to provide access for maintenance. Similarly, water exhaust devices from the sink 180 and hand dryers 100 may pass through the cabinet 190 to provide access for maintenance. Electrical connections may be provided within the cabinet 190. These electrical connections may supply power to the automatic valve of the faucet 181 and / or the fan of the hand dryer 100.

[0099] Figure 20 It shows the use of Figures 1 to 19 An exemplary control system 301 for any dryer system. Control system 400 may implement controller 10 in other examples. Control system 400 may include processor 300, memory 352, and communication interface 353 for interfacing with a device or with the Internet and / or other networks 346. In addition to communication interface 353, sensor interface may be configured to receive data from sensors described herein or from any source described herein. Components of control system 400 may communicate using bus 348. Control system 400 may be connected to a workstation or another external device (e.g., control panel) and / or database to receive user input, system characteristics, and any numerical values ​​described herein.

[0100] The control system 400 may include a sensor 12 and / or a timer 11, the sensor 12 being configured to generate sensor data for objects in the vicinity of the sensor, and the timer 11 being configured to measure the elapsed time period. The processor 300 is configured to generate instructions to operate the hand dryer (e.g., turn on a fan) to pass air through at least one cyclone in response to the sensor data or the elapsed time period.

[0101] Optionally, the control system 400 may include an input device 355 and / or sensing circuitry that communicates with any sensor. The sensing circuitry, as described above, receives sensor measurements from sensor 12. The input device 355 may include a switch (e.g., an actuator), a touchscreen coupled to or integrated therewith, a keyboard, a remote control, a microphone for voice input, a camera for gesture input, and / or other mechanical products.

[0102] Optionally, the control system 400 may include a drive unit 340 for receiving and reading a non-transitory computer medium 341 having instructions 342. Additional, different, or fewer components may be included. The processor 300 is configured to execute instructions 342 stored in memory 352 for performing the algorithms described herein. The display 350 may be supported by any of the components described herein. The display 350 may be combined with a user input device 355.

[0103] Figure 21It shows Figure 19 The flowchart illustrates the actions of the control system 400. The actions in the flowchart can be performed by any combination of the control system 400, network devices, or servers. Additional, different, or fewer actions may be included.

[0104] In action S101, the processor 300 can receive sensor data from the sensor 12. This sensor data indicates the presence of an object near the hand dryer 100. The sensor 12 can detect the presence of one or more hands inside the drying duct of the hand dryer 100. The sensor data can indicate that the faucet has been used. The sensor data can indicate the presence of a user near the hand dryer 100.

[0105] In action S103, processor 300 generates a fan command in response to sensor data. This fan command instructs the fan to operate or turn on (i.e., drive air) to the air knife. The air knife can provide a narrow path for the air, increase its speed, and expel the air through at least one opening. In action S105, the airflow from the air knife, with its increased speed, is directed toward the user's hand, and water (e.g., including particles or aerosols) is mechanically stripped from the hand into a tubular cavity, flowing toward at least one cyclone chamber.

[0106] In action S107, the airflow is then directed into at least one cyclone chamber, where it follows at least a partially annular or meandering path, projecting particles onto the surface of the cyclone chamber. Some air exits the cyclone chamber through an exhaust path. At least some water exits the cyclone chamber through a drain outlet. In some examples, some water and air may be discharged together through the exhaust path.

[0107] In action S109, processor 300 generates a disinfection command in response to sensor data to perform disinfection, sterilization, or other cleaning actions on the projected particles. The disinfection command may cause ultraviolet light to irradiate at least one cyclone chamber (e.g., particles or aerosols adhering to the inner surface of at least one cyclone chamber). The disinfection command may cause a spray generator to produce a mist comprising a chemical product (e.g., hydrogen peroxide) in at least one cyclone chamber. The disinfection command may cause an ozone generator to release ozone in at least one cyclone chamber. Any combination of these sterilization technologies may be used.

[0108] Processor 300 may be a general-purpose or special-purpose processor, an application-specific integrated circuit (ASIC), one or more programmable logic controllers (PLCs), one or more field-programmable gate arrays (FPGAs), a set of processing components, or other suitable processing components. Processor 300 is configured to execute computer code or instructions stored in memory 352 or received from other computer-readable media (e.g., embedded flash memory, local hard disk storage, local ROM, network storage, remote server, etc.). Processor 300 may be a single device or a combination of devices, such as devices associated with networking, distributed processing, or cloud computing.

[0109] Memory 352 may include one or more means (e.g., memory cells, memory devices, storage devices, etc.) for storing data and / or computer code to perform and / or facilitate the various processes described in this disclosure. Memory 352 may include random access memory (RAM), read-only memory (ROM), hard disk drive memory, temporary memory, non-volatile memory, flash memory, optical memory, or any other suitable memory for storing software objects and / or computer instructions. Memory 352 may include database components, object code components, script components, or any other type of information structure to support the various activities and information structures described in this disclosure. Memory 352 may be communicatively connected to processor 300 via processing circuitry and may include computer code for performing (e.g., by processor 300) one or more processes described herein. For example, memory 298 may include graphics, web pages, HTML files, XML files, script code, configuration files, or other resources for generating graphical user interfaces for display and / or for interpreting user interface input to make command, control, or communication decisions.

[0110] In addition to ingress and egress ports, communication interface 353 may include any operable connection. An operable connection may be one in which signals, physical communications, and / or logical communications can be sent and / or received. Operable connections may include physical interfaces, electrical interfaces, and / or data interfaces. Communication interface 353 may be connected to a network. This network may include a wired network (e.g., Ethernet), a wireless network, or a combination thereof. A wireless network may be a cellular telephone network, an 802.11, 802.16, 802.20, or a WiMax network, Bluetooth pairing of devices, or a Bluetooth mesh network. Furthermore, the network may be a public network, such as the Internet, a private network, such as an intranet, or a combination thereof, and may utilize various currently available or future-developed network protocols, including but not limited to TCP / IP based on the Internet Protocol.

[0111] Although a computer-readable medium (e.g., memory 352) is shown as a single medium, the term "computer-readable medium" includes single or multiple media, such as centralized or distributed databases, and / or associated caches and servers that store one or more sets of instructions. The term "computer-readable medium" should also include any medium capable of storing, encoding, or carrying a set of instructions for processor execution, or causing a computer system to perform any one or more methods or operations disclosed herein.

[0112] In certain non-limiting exemplary embodiments, a computer-readable medium may include solid-state memory, such as a memory card or other package housing one or more non-volatile read-only memories. Furthermore, a computer-readable medium may be random access memory or other volatile rewritable memory. Additionally, a computer-readable medium may include magneto-optical or optical media, such as disks or magnetic tapes or other storage devices, to capture carrier signals, such as signals used in communications via transmission media. Digital file attachments such as emails or other self-contained information archives or sets of archives can be considered distributed media, which are tangible storage media. Therefore, this disclosure is considered to include any one or more of computer-readable media or distributed media and other equivalents and follow-up media in which data or instructions may be stored. A computer-readable medium may be non-transitory, which includes all tangible computer-readable media.

[0113] In another embodiment, a dedicated hardware implementation, such as an application-specific integrated circuit (ASIC), a programmable logic array (PLA), and other hardware devices, can be constructed to implement one or more methods described herein. Applications that may include the devices and systems of the various embodiments can broadly encompass a wide range of electronic and computer systems. One or more embodiments described herein may use two or more specific, interconnected hardware modules or devices that have associated control and data signals, can communicate between and through modules, or serve as part of an ASIC. Therefore, this system covers the integration of software, firmware, and hardware.

[0114] The illustrations of the embodiments described herein are intended to provide a general understanding of the structure of various embodiments. These illustrations are not intended as a complete description of all elements and features of devices and systems utilizing the structures or methods described herein. Many other embodiments may become apparent to those skilled in the art upon review of this disclosure. Other embodiments may be utilized and derived from this disclosure, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure. Furthermore, the illustrations are merely representative and may not be drawn to scale. Some scales in the illustrations may be exaggerated, while others may be minimized. Therefore, this disclosure and the accompanying drawings should be considered illustrative rather than restrictive.

[0115] While this specification contains numerous specific details, these details should not be construed as limiting the scope of the invention or the scope that may be claimed, but rather as descriptions of specific features of particular embodiments of the invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments. Furthermore, although the foregoing features may be described as functioning in certain combinations, or even initially claimed in this way, in some cases one or more features from the claimed combination may be removed from the claimed combination, and the claimed combination may be for sub-combinations or variations thereof.

[0116] One or more embodiments of this disclosure may be referred to herein individually and / or collectively by the term "invention," merely for convenience and not intended to voluntarily limit the scope of this application to any particular invention or inventive concept. Furthermore, although specific embodiments have been illustrated and described herein, it should be understood that any subsequent arrangements intended to achieve the same or similar purpose may replace the specific embodiments shown. This statement is intended to cover any and all subsequent modifications or variations of the various embodiments. Combinations of the above embodiments, as well as other embodiments not specifically described herein, will be apparent to those skilled in the art upon reading the description.

[0117] The above detailed description is intended to be illustrative rather than restrictive, and it should be understood that the following claims, including all equivalents, are intended to define the scope of the invention. The claims should not be construed as limiting to the order or elements described unless so stated. Therefore, all embodiments within the scope and spirit of the following claims and their equivalents are claimed as part of the invention.

Claims

1. A hand dryer, comprising: fan; pipeline; At least one air knife, the at least one air knife being configured to direct air from the fan and being configured to dry one or more hands and push moisture from the one or more hands into the duct; and At least one cyclone device provides at least a partially detour path for the air and the moisture from the one or more hands, wherein the at least one cyclone device includes an inner channel and an outer channel.

2. The hand dryer according to claim 1, wherein particles discharged from the air and the water adhere to the at least one cyclone device.

3. The hand dryer of claim 1, wherein the at least one air knife comprises a first air knife and a second air knife, each air knife being configured to direct air from the fan to dry a single hand and push water from the single hand to the conduit.

4. The hand dryer according to claim 1, further comprising: A drainage path communicating with the at least one cyclone device is provided for discharging the water from the at least one cyclone device.

5. The hand dryer according to claim 1, further comprising: A light source configured to sterilize the air and water in the at least one cyclone device.

6. The hand dryer according to claim 1, further comprising: A filter configured to remove particles from the air.

7. The hand dryer of claim 6, wherein the filter is located upstream of the air knife or coupled to the conduit.

8. The hand dryer of claim 6, wherein the filter is a room filter configured to filter the air near the hand dryer.

9. The hand dryer according to claim 1, further comprising: An exhaust path connected to the at least one cyclone device, the exhaust path being configured to remove the air from the hand dryer.

10. The hand dryer according to claim 1, further comprising: A disinfectant dispenser configured to supply disinfectant to the at least one cyclone device.

11. The hand dryer according to claim 1, further comprising: A sensor configured to generate sensor data for a region in the vicinity of the sensor; A timer configured to measure an elapsed time period; and A controller configured to operate the fan in response to the sensor data or the elapsed time period, causing air to move through the at least one cyclone device.

12. The hand dryer of claim 11, wherein the disinfectant is provided to the at least one cyclone device in response to the sensor data or the elapsed time period.

13. A hand dryer, comprising: A left tubular cavity, the left tubular cavity being used to receive one of the user's hands; A right tubular cavity for receiving the user's other hand; At least one first air knife, the at least one first air knife being angled toward the left tubular cavity; At least one second air knife, the at least one second air knife being angled toward the right tubular cavity; and An extended cavity is connected to the left and right tubular cavities, and the volume of the extended cavity is greater than the volumes of the left and right tubular cavities to slow down the airflow from the at least one first air knife and the at least one second air knife, wherein the extended cavity is configured to collect water droplets or particles suspended in the airflow.

14. The hand dryer of claim 13, further comprising: Pressure chamber; as well as A fan coupled to the pressure chamber, wherein the pressure chamber supplies the airflow from the fan to the at least one first air knife and the at least one second air knife.

15. The hand dryer according to claim 13, further comprising: A disinfection device configured to disinfect, sterilize, or clean the water droplets or particles collected from the airflow.

16. A control system for operating a hand dryer as claimed in any one of claims 1 to 10 and 13 to 15, the control system comprising: A sensor configured to generate sensor data for objects near the hand dryer; A timer configured to measure the time elapsed after the object is no longer detected by the sensor; and A controller configured to operate a fan to move air through the hand dryer in response to the sensor data or the elapsed time period, the controller being configured to operate the fan in response to the sensor data and to stop the fan in response to the elapsed time period.

17. The control system of claim 16, wherein the controller operates in a low-flow mode to purify the air in the room including the hand dryer.

18. The control system of claim 16, wherein the controller operates in a disinfection mode to release disinfectant to the hand dryer.

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