A shower-type hair dryer and an intelligent mode recognition system thereof

Abstract

The application belongs to the technical field of hair dryers, and particularly relates to a shower type hair dryer and an intelligent mode recognition system thereof, which comprises a body shell, a blowing motor and a heating body arranged in the body shell, a shower type air outlet assembly, a mechanical air duct switching mechanism and an open-loop constant temperature control module without a sensor are installed in the body shell, the shower type air outlet assembly is fixedly installed at an air outlet end of a front end of the body shell, the overall appearance is consistent with that of a shower structure for bathing, is circular and annular, the assembly is divided into two groups of completely independent air supply channels which are not communicated with each other by an annular sealing partition plate which is integrally injection molded, a central region is an inner ring main air outlet which corresponds to a central air supply air duct, by adopting double independent shower air outlets and a gear switching mechanism, strong wind and soft wind modes can be switched by one key, the open-loop temperature control scheme without a sensor is carried, a temperature measuring element is saved, cost is reduced, temperature control response is fast, precision is high, anti-interference performance is strong, and quick drying and hair care are considered.

Description

Technical Field

[0001] This invention belongs to the field of hair dryer technology, specifically a shower-type hair dryer and its intelligent pattern recognition system. Background Technology

[0002] Hair dryers are common personal care appliances used in daily life. They mainly use hot air combined with airflow to quickly dry and style hair. The stability of the hot air temperature and the uniformity of the airflow directly affect the drying efficiency and the health of the scalp and hair.

[0003] Most conventional hair dryers on the market currently use a single air outlet direct blowing structure, which results in concentrated airflow and a small airflow coverage area. During the drying process, the machine body needs to be moved repeatedly, which is inconvenient to use. At the same time, direct blowing of hot air can easily cause localized excessively high temperatures, which can damage the hair cuticles with long-term use, leading to dry and split ends, and a hot and uncomfortable scalp.

[0004] However, in the existing technology, the mainstream hair dryers on the market do not adopt the shower-style ring-shaped appearance structure. The products are mainly designed with a single air outlet and only have a single fixed air outlet mode. A few hair dryers with dual air outlets have interconnected internal air ducts, and the two sets of air outlets cannot be independently isolated to deliver air, nor can they switch between different air fields. If users want to change the blowing effect, they can only frequently disassemble and assemble external accessories, which is cumbersome and has a poor user experience. Therefore, this invention provides a shower-style hair dryer and its intelligent mode recognition system. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: A shower-type hair dryer of the present invention includes a body shell, a blower motor and a heating element disposed inside the body shell, characterized in that: a shower-type air outlet assembly, a mechanical air duct switching mechanism and a sensorless open-loop constant temperature control module are installed inside the body shell, the shower-type air outlet assembly is disposed at the air outlet end of the body shell, and the whole is arranged in a ring-shaped shower layout, having an inner ring main air outlet and an outer ring secondary air outlet that are independent of each other and whose air ducts are not connected to each other, the inner ring main air outlet corresponds to the central air duct, and the outer ring secondary air outlet corresponds to the surrounding ring air duct; The mechanical air duct switching mechanism is located on the air inlet side of the air duct inside the housing, and includes a lever, rack, main gear, driven gear, secondary gear one, secondary gear two, air guide plate one, and air guide plate two. The lever is fixedly linked with the rack, the rack meshes with the main gear, the main gear meshes with secondary gear one and driven gear respectively, the driven gear meshes with secondary gear two, and air guide plate one and air guide plate two are coaxially linked with secondary gear one and secondary gear two respectively. As the gear set rotates, it selectively blocks the air inlet end of the central air supply duct or the annular air supply duct, so that the two sets of air ducts are in a mutually exclusive conduction state, realizing the switching between the inner ring strong wind mode and the outer ring gentle wind mode. The sensorless open-loop constant temperature control module includes a main control MCU chip, a power drive unit, a voltage acquisition unit, and a gear input unit. The main control MCU chip has a built-in storage unit containing a three-dimensional power mapping data table. The data table maps the target heating power values ​​corresponding to the fan speed level, the air temperature mode, and the input voltage. The main control MCU chip obtains the real-time input voltage through the voltage acquisition unit and the current fan speed and air temperature level through the gear input unit. After matching the corresponding target heating power by looking up the table, it outputs a control signal to the power drive unit to adjust the output power of the heating element, thereby maintaining a constant outlet air temperature in a sensorless open-loop control mode.

[0007] Preferably, the first and second air guide plates swing synchronously in opposite directions under the transmission of the gear set, and the lever moves in a straight line in a single direction to complete the switching of the two sets of air ducts.

[0008] Preferably, the rack, main gear, driven gear and secondary gear one and secondary gear two have the same gear module. When the linear push stroke of the rack is 4mm, the gear set can drive the air guide plate one and air guide plate two to complete an 80° rotation opening and closing angle, so as to realize the complete switching of the two sets of air ducts.

[0009] Preferably, the inner ring strong wind mode outputs a concentrated high-pressure airflow for rapid hair drying, while the outer ring soft wind mode outputs a diffused multi-hole soft wind, significantly increasing the wind field coverage area for hair smoothing, styling, and hair care.

[0010] Preferably, the outer ring of the secondary air outlet of the shower-type air outlet component is provided with an infrared therapy lamp group, and the hair dryer also includes an adaptive water ion generating module. The water ion generating module is located at the center of the air outlet, and the water ion airflow it outputs does not pass through the heating element.

[0011] A smart pattern recognition system for a shower-type hair dryer, applied to any of the above-mentioned shower-type hair dryers, wherein the system is an open-loop temperature control system without a temperature sensor: This includes the main control MCU chip, power drive unit, voltage acquisition unit, and gear input unit; The main control MCU chip has a built-in storage unit, which contains a three-dimensional power mapping data table. The data table maps the target heating power value corresponding to the wind speed setting, wind temperature mode, and input voltage. The voltage acquisition unit is used to acquire the real-time voltage value of the mains power input and transmit it to the main control MCU chip; The gear input unit is used to receive the wind speed gear and wind temperature mode signals set by the user and transmit them to the main control MCU chip. The main control MCU chip matches the corresponding target heating power from the three-dimensional power mapping data table based on the real-time input voltage, current wind speed setting, and wind temperature mode, and outputs a control signal to the power drive unit. The power drive unit adjusts the output power of the hair dryer's heating element to maintain a constant air outlet temperature in an open-loop control manner.

[0012] Preferably, the three-dimensional power mapping data table covers all combinations of dual input voltage, two fan speeds, and two air temperatures. The dual input voltages are 100V and 240V, the two fan speeds are low speed and high speed, and the two air temperatures are warm air and hot air, forming a total of four sets of fan speed and air temperature combinations.

[0013] Preferably, the main control MCU chip uses PWM zero-crossing power adjustment to output control signals to the power drive unit, the temperature control response speed during gear switching is ≤100ms, and the steady-state temperature control accuracy of the blower outlet is ±5℃.

[0014] Preferably, the main control MCU chip has built-in over-temperature, over-current, and over-voltage software protection logic. When an abnormal operating condition is detected, the power output of the heating element is immediately cut off through the power drive unit. The power drive unit uses bidirectional thyristors or MOSFETs as power switching devices. The main control MCU chip is an 8-bit or 32-bit low-power MCU with built-in ADC and PWM modules.

[0015] Preferably, the main control MCU chip is used to electrically connect with the water ion generating module of the hair dryer. When the water ion generating module is turned on, the main control MCU chip automatically locks the target air outlet temperature within the water ion activity range of 45℃-65℃, and dynamically adjusts the output power of the water ion generating module according to the real-time working conditions to maintain the stability of water ion concentration and activity.

[0016] The beneficial effects of this invention are as follows: 1. The shower-type hair dryer and its intelligent mode recognition system described in this invention, by adopting dual independent shower outlets and gear switching mechanism, can switch between strong wind and gentle wind modes with one button. It is equipped with a sensorless open-loop temperature control scheme, which eliminates the need for temperature measuring elements, reduces costs, and has fast temperature control response, high accuracy, and strong anti-interference, while taking into account both quick drying and hair care.

[0017] 2. The shower-type hair dryer and its intelligent pattern recognition system described in this invention drive two air guide plates to swing synchronously in opposite directions through a gear set. The air duct switching can be completed by simply moving the lever 14 in a single direction. The operation is simple, the air duct switching is thorough and there is no cross-flow, the air field pattern is crisp and there is no mixed airflow, and it supports one-handed blind operation. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the fuselage housing in this invention; Figure 2 This is a schematic diagram of the lever structure in this invention; Figure 3 This is a schematic diagram of the front cover structure in this invention; Figure 4 This is a schematic diagram of the structure of the back cover in this invention; Figure 5 This is a schematic diagram of the structure of the secondary gear one in this invention; Figure 6 This is a schematic diagram of the structure of the second air guide plate in this invention; Figure 7 This is a flowchart illustrating the intelligent temperature control system of this invention.

[0020] In the diagram: 1. Body casing; 11. Outer ring secondary air outlet; 12. Inner ring main air outlet; 13. Infrared therapy lamp assembly; 14. Lever; 15. Front cover; 16. Clamping plate; 17. Rear cover; 18. Main gear; 19. Secondary gear one; 110. Driven gear; 111. Secondary gear two; 112. Rack; 113. Air guide plate one; 114. Air guide plate two. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figure 1-6 As shown in the figure, a shower-type hair dryer and its intelligent pattern recognition system according to an embodiment of the present invention include a body housing 1, a blower motor and a heating element disposed inside the body housing 1. The body housing 1 is equipped with a shower-type air outlet assembly, a mechanical air duct switching mechanism and a sensorless open-loop constant temperature control module. The shower-type air outlet assembly is disposed at the air outlet end of the body housing 1 and is arranged in a ring-shaped shower layout. It has an inner ring main air outlet 12 and an outer ring secondary air outlet 11 that are independent of each other and whose air ducts are not connected. The inner ring main air outlet 12 corresponds to the central air duct, and the outer ring secondary air outlet 11 corresponds to the surrounding ring air duct. The mechanical air duct switching mechanism is located on the air inlet side of the air duct inside the housing 1, and includes a lever 1414, a rack 112112, a main gear 1818, a driven gear 110110, a secondary gear 19, a secondary gear 111, a guide plate 113, and a guide plate 114. The lever 14 is fixedly linked with the rack 112, the rack 112 meshes with the main gear 18, the main gear 18 meshes with the secondary gear 19 and the driven gear 110, the driven gear 110 meshes with the secondary gear 111, and the guide plate 113 and the guide plate 114 are coaxially linked with the secondary gear 19 and the secondary gear 111, respectively. As the gear set rotates, it selectively blocks the air inlet of the central air supply duct or the annular air supply duct, so that the two sets of air ducts are in a mutually exclusive conduction state, realizing the switching between the inner ring strong wind mode and the outer ring gentle wind mode. The sensorless open-loop constant temperature control module includes a main control MCU chip, a power drive unit, a voltage acquisition unit, and a gear input unit. The main control MCU chip has a built-in storage unit, which stores a three-dimensional power mapping data table. The data table maps the target heating power value corresponding to the fan speed gear, the fan temperature mode, and the input voltage. The main control MCU chip obtains the real-time input voltage through the voltage acquisition unit and the current fan speed and fan temperature gear through the gear input unit. After matching the corresponding target heating power by looking up the table, it outputs a control signal to the power drive unit to adjust the output power of the heating element, thereby maintaining a constant outlet air temperature in a sensorless open-loop control mode. During use, the shower-style air outlet component is fixedly installed at the air outlet end of the front of the housing 1. The overall appearance is consistent with the structure of the shower head, with a circular layout. The inside of the component is divided into two completely independent air supply channels with no connection between them by an integrally injection-molded annular sealing partition. The central area is the inner ring main air outlet 12, corresponding to the central air supply channel. The cross-section of the channel is a circular hollow structure. After the airflow is concentrated and gathered, it is blown out to form a high-pressure strong wind zone. The annular area surrounding the outer side of the inner ring is the outer ring secondary air outlet 11, corresponding to the surrounding annular air supply channel. 36 circular air outlet holes are evenly distributed on the end face of the channel. After the airflow is diffused through the holes, it is blown out to form a large area of ​​soft wind zone. The two sets of air ducts are completely physically isolated by a sealed partition, with no airflow passage, allowing for independent conduction and preventing cross-flow. Unlike the traditional through-type dual air duct structure of hair dryers, the mechanical air duct switching mechanism is installed on the air inlet side of the air duct at the air outlet of the unit, located between the heating element and the inlet of the two independent air ducts. This mechanism acts as the actuator for opening and closing the air ducts. The complete transmission assembly includes a lever 14, rack 112, main gear 18, driven gear 110, secondary gear 19, secondary gear 111, air guide plate 113, and air guide plate 114. All gears and racks are fixed to the air duct housing via a rotating shaft. On the plastic bracket, the exposed actuating end of the lever 14 is located on the side of the machine head for easy one-handed operation. The inner side of the lever is injection molded integrally with the rack 112. The lever drives the rack to perform linear reciprocating motion along the machine body axis. The tooth surface of the rack 112 meshes with the external teeth of the main gear 18 for transmission. The main gear 18 simultaneously meshes with the secondary gear 19 and the driven gear 110. The other side of the driven gear 110 meshes with the secondary gear 111, forming a two-stage gear transmission chain. The air guide plate 113 and the air guide plate 114 are arc-shaped damper structures, coaxially fixedly connected to the secondary gear 19 and the secondary gear 111, respectively. The gears rotate synchronously. During operation, the user moves the lever, causing the rack to move horizontally. Through the gear set, the two air guide plates swing synchronously in opposite directions, selectively blocking the air inlet ports of the central or annular air supply duct. This keeps the two ducts in a mutually exclusive state of alternating open and closed flow, ultimately achieving one-button switching between the inner ring strong wind mode and the outer ring gentle wind mode. The hardware carrier of the sensorless open-loop constant temperature control module is the main control PCB board inside the handle. The core units include the main control MCU chip, power drive unit, voltage acquisition unit, and gear input unit. The main control MCU chip has built-in Flash storage. The unit comes pre-loaded with a three-dimensional power mapping data table before leaving the factory. This data table uses fan speed setting, temperature mode, and real-time input voltage as index dimensions, storing the optimal heating power calibration value for each operating condition. The voltage acquisition unit uses a resistor divider circuit connected in parallel to the AC input port to step down the high-voltage AC signal before sending it to the MCU's built-in ADC sampling channel to acquire the input voltage value in real time. The setting input unit is connected to the mode buttons on the handle surface to acquire the user-set fan speed and temperature settings. The power drive unit uses a bidirectional thyristor or MOSFET connected in series in the power supply circuit of the heating element.The MCU receives control signals and adjusts the duty cycle, completely eliminating temperature sensing elements such as NTC thermistors and infrared temperature probes. It does not rely on temperature feedback to form a closed loop, but instead achieves constant temperature through open-loop logic of operating condition acquisition, table lookup matching, and power output. The MCU acquires three types of parameters in real time: input voltage, fan speed, and fan temperature mode. It retrieves a three-dimensional data table to match the target heating power and outputs a PWM control signal to the power drive unit to precisely adjust the output power of the heating element. Relying on a calibrated power-temperature relationship, it stabilizes the outlet temperature. The entire unit supports 1 Globally compatible with 0V / 240V dual voltage, it features two fan speed settings (low / high) and two temperature settings (warm / hot), forming four basic operating levels: low-speed warm air, low-speed hot air, high-speed warm air, and high-speed hot air. The power parameters for all levels are pre-written into a data table and centrally controlled by the MCU. During operation, a dual independent showerhead outlet and gear switching mechanism allow for one-button switching between strong and gentle wind modes. Equipped with a sensorless open-loop temperature control solution, it eliminates the need for temperature sensing elements, reducing costs. The system offers fast temperature response, high accuracy, and strong anti-interference capabilities, balancing quick drying with hair care.

[0023] like Figure 1-6 As shown, the first air guide plate 113 and the second air guide plate 114 swing synchronously in opposite directions under the transmission of the gear set. The lever 14 can switch the opening and closing of the two sets of air ducts by moving linearly in one direction. In use, the first air guide plate 113 and the second air guide plate 114 strictly perform synchronous reverse swinging under the transmission of the gear set. The two sets of air ducts can be switched synchronously by simply pushing and pulling the lever 14 in one direction. When the user pushes the lever 14 upward, the rack 112 moves upward and drives the main gear 18 to rotate clockwise. The main gear 18 directly drives the secondary gear 19 to rotate counterclockwise. The first air guide plate 113 swings counterclockwise synchronously, closing the inlet of the inner ring air duct. At the same time, the main gear 18 drives the driven gear 110 to rotate counterclockwise. The driven gear 110 then drives the secondary gear 111 to rotate clockwise. The second air guide plate 114 swings counterclockwise. The synchronous clockwise swing opens the outer ring air duct inlet, switching the entire unit to outer ring soft wind mode. Conversely, when the lever 14 is pushed down, the first air guide plate 113 swings clockwise to open the inner ring air duct, and the second air guide plate 114 swings counterclockwise to close the outer ring air duct, switching to inner ring strong wind mode. The swing angles of the two air guide plates are completely synchronized and opposite in direction, with no intermediate semi-conducting state. There is no mixed airflow when the air duct is switched, and the air field pattern is switched cleanly and thoroughly. Compared with the traditional multi-directional linkage damper structure, the single linear toss operation logic is more in line with user habits. It can be operated blindly with one hand. During this process, the two air guide plates are driven to swing synchronously in opposite directions through the gear set. The air duct mutual exclusion switch can be completed by linearly tossing the lever 14 in one direction. The operation is simple, the air duct switch is thorough and there is no cross-flow, the air field pattern is clean and there is no mixed airflow, and it supports one-handed blind operation.

[0024] like Figure 1-6As shown, the rack 112, main gear 18, driven gear 110, secondary gear 19, and secondary gear 211 have the same gear module. When the linear driving stroke of the rack 112 is 4mm, it can drive the air guide plate 113 and air guide plate 214 to complete an 80° rotational opening and closing angle through the gear set, realizing the complete switching of the two sets of air ducts. In use, the rack 112, main gear 18, driven gear 110, secondary gear 19, and secondary gear 211 all adopt a standard gear design with a uniform module, module m=0.5, which conforms to the GB / T1357 cylindrical gear module standard. All gear teeth have the same meshing clearance, multi-stage transmission has no power loss, rotation is completely synchronized, and the operating noise is less than 35dB. Through the optimized design of the gear transmission ratio, a small stroke and large angle switching effect is achieved. The rack 112 only needs a 4mm linear driving stroke to drive the entire set. The gears rotate synchronously by two tooth pitches, ultimately driving the air guide plate 113 and air guide plate 214 to complete an 80° rotation opening and closing angle. This angle is sufficient for the air guide plate to completely cover the air inlet port of the corresponding air duct, achieving a complete sealing switch of the air duct with an air leakage rate of less than 5%. Compared with the traditional linkage damper mechanism that requires more than 15mm of toggle stroke, this multi-stage gear amplification mechanism shortens the switching stroke by more than 70%. The axial thickness of the entire mechanism is only 8mm, which can reduce the internal space occupied by the blower by 60%. The space saved is used to optimize the curvature of the air duct. In this process, the air leakage effect can be greatly reduced by the sealing switch of the air duct, increasing the utilization rate of air volume, while reducing air supply resistance and wind noise. Since the entire set of gears, air guide plate 113, air guide plate 214, and lever 14 are pre-assembled modular components, the production line can directly snap them together for installation, greatly reducing manual assembly time and error rate.

[0025] like Figure 1-6As shown, the inner ring strong wind mode outputs concentrated high-pressure airflow for rapid hair drying, while the outer ring soft wind mode outputs diffused multi-hole soft wind, significantly increasing the airflow coverage area for hair smoothing, styling, and hair care. In use, the two airflow modes are designed for different hair care needs, with distinct differences in airflow characteristics and applicable scenarios. In the inner ring strong wind mode, the main air outlet outputs concentrated high-pressure columnar airflow; at high speed, the center wind speed at the outlet can reach 12m / s. The concentrated air pressure and strong penetration allow it to reach directly to the hair roots, quickly evaporating deep moisture from the hair strands, improving drying efficiency by 3% compared to traditional single-outlet airflow. With a dryness rate of over 0%, it is suitable for quickly drying thick, dense hair after washing, solving the problem of uneven drying caused by traditional hair dryers where the surface is dry while the roots are wet. Secondly, the outer ring soft wind mode features a ring-shaped multi-hole shower-style air outlet with 36 air outlets arranged at a 15° diffusion angle. The airflow is gentle and dispersed, and the overall air field coverage diameter is 80% larger than that of traditional single air outlets, allowing for large-area coverage of the entire hair strand. During this process, after drying the wet hair to half-dry, a large area of ​​soft wind is used to evenly blow on the hair strands, reducing the damage to the hair cuticle caused by local high-temperature direct blowing. It can smooth frizz, set the style, and lock in moisture, making it suitable for fine, damaged hair and the need for refined styling of bangs and ends.

[0026] like Figure 1-6 As shown, the outer ring of the shower-type air outlet 11 is equipped with an infrared therapy lamp group 13; the hair dryer also includes an adaptive water ion generating module, which is located at the center of the air outlet end, and the water ion airflow it outputs does not pass through the heating element; during use, the infrared therapy lamp group 13 has 8 far-infrared LED beads evenly arranged in a ring around the outer ring of the outer ring of the outer ring of the secondary air outlet 11, with a wavelength of 630nm, which light up synchronously with the whole machine during the blowing process, and the infrared light synchronously irradiates the scalp area with the airflow. The main body of the adaptive water ion generating module is installed at the center of the air outlet end, and adopts a condensation high-pressure atomization structure, including a semiconductor cooling condenser, a high-pressure discharge needle and an independent air supply channel. During operation, the semiconductor cooling condenser... The cooling plate condenses water vapor in the air to form condensate, which is then ionized and broken down by a high voltage of over 1000V to generate nano-sized water ions with a particle size of 50~200nm. The water ions are sent out through a central independent air duct, and the airflow does not pass through the heating area of ​​the heating element. The outlet temperature is 10~15℃ lower than the main air temperature, which reduces the damage to the ion structure caused by high-temperature evaporation. The water ion activity retention rate can reach over 90%, and it can penetrate deep into the hair cuticle with the airflow to achieve a moisturizing and hair care effect. During this process, the irradiation of the infrared therapy lamp group 13 can promote blood circulation in the scalp and hair follicles, improve hair follicle activity, and also have a scalp care and therapy effect. The adaptive water ion generation module can achieve a moisturizing and hair care effect by improving the activity of water ions and reducing the damage to ions caused by high-temperature evaporation.

[0027] like Figure 7As shown, a smart pattern recognition system for a shower-type hair dryer is applied to any of the shower-type hair dryers described above. This system is an open-loop temperature control system without a temperature sensor. This includes the main control MCU chip, power drive unit, voltage acquisition unit, and gear input unit; The main control MCU chip has a built-in storage unit, which contains a three-dimensional power mapping data table. The data table maps the target heating power value corresponding to the wind speed setting, wind temperature mode, and input voltage. The voltage acquisition unit is used to acquire the real-time voltage value of the mains power input and transmit it to the main control MCU chip; The gear input unit is used to receive the wind speed gear and wind temperature mode signals set by the user and transmit them to the main control MCU chip. The main control MCU chip matches the target heating power by looking up the table in the three-dimensional power mapping data table according to the real-time input voltage, current wind speed level and wind temperature mode, and outputs a control signal to the power drive unit. The power drive unit adjusts the output power of the hair dryer heating element to maintain a constant air outlet temperature of the hair dryer in an open-loop control manner. Main control MCU chip: As the core control unit of the system, it has a built-in Flash storage unit. The unit has a three-dimensional power mapping data table that has been calibrated before leaving the factory. The data table establishes the mapping relationship between three types of input parameters, namely wind speed, wind temperature mode, and input voltage, and the target heating power. It is the core basis for open-loop temperature control. Voltage acquisition unit: Composed of a precision resistor voltage divider circuit and the MCU built-in ADC sampling channel, it is connected in parallel to the front end of the mains power input to acquire the real-time voltage value of the mains power input, convert the analog voltage signal into a digital signal and transmit it to the main control MCU to compensate for the impact of voltage fluctuations on heating power; Gear input unit: Connects to the fan speed button, air temperature button and mode button on the surface of the unit. It uses a matrix scanning method to collect user operation signals with a scanning cycle of 10ms. After software debouncing, the current fan speed gear and air temperature mode signal are transmitted to the main control MCU. Power drive unit: connected in series in the AC power supply circuit of the heating element, receives control signals from the MCU to adjust the conduction state, thereby changing the actual output power of the heating element; The core control logic of the system is open-loop lookup table temperature control: the main control MCU simultaneously acquires three types of parameters: real-time input voltage, current fan speed level, and fan temperature mode. These parameters are used as an index to retrieve the three-dimensional power mapping data table, match the target heating power value under the corresponding operating condition, and then output a PWM control signal to the power drive unit. By adjusting the duty cycle of the power devices, the output power of the heating element is stabilized at the target value. The outlet temperature is kept constant by relying on the pre-calibrated power-temperature correspondence, eliminating the need for temperature sensor feedback correction and fundamentally eliminating the temperature measurement link. In the power supply chain of the whole machine, the mains input first passes through the power rectification and step-down module and is divided into two outputs. One is a high-voltage circuit, which powers the heating element and the fan motor through the power drive unit; the other is a low-voltage circuit, which powers the MCU, buttons, and water ion module control circuit. The voltage acquisition point is set at the front end of the mains input rectification to ensure the real-time and accuracy of voltage sampling.

[0028] like Figure 7 As shown, the three-dimensional power mapping data table covers all combinations of dual input voltage, two fan speeds and two air temperatures. The dual input voltages are 100V and 240V, the two fan speeds are low speed and high speed, and the two air temperatures are warm air and hot air, forming a total of four sets of fan speed and air temperature combinations. The three-dimensional power mapping data table was generated through extensive calibration tests in a constant temperature and humidity laboratory environment (25℃, standard atmospheric pressure), fully covering all rated operating conditions of the hair dryer. Voltage dimension: Covers two standard input voltages, 100V low voltage and 240V mains power, and also includes compensation power values ​​for voltage fluctuation range of ±15%; Wind speed dimension: Includes two wind speeds, low speed and high speed, corresponding to different motor speeds; Temperature control includes a warm air setting with a target constant temperature of 65℃ and a hot air setting with a target constant temperature of 85℃. It also reserves dedicated temperature settings for scalp and moisture-locking modes. These three types of parameters are combined to form four basic operating settings: low-speed warm air, low-speed hot air, high-speed warm air, and high-speed hot air, as well as two special modes: scalp and moisture-locking. During calibration, each operating condition is tested 20 times repeatedly, recording the steady-state temperature of the air outlet at different power levels. The optimal heating power corresponding to the target temperature is then fitted. Simultaneously, the power compensation coefficient for voltage fluctuations is collected. All data is processed and solidified into the MCU's built-in Flash. The data table uses a piecewise linear interpolation algorithm. When the input voltage is between two calibration points, the MCU can calculate the real-time target power through interpolation, achieving smooth power adjustment under continuous voltage and further improving wide voltage adaptability. After the device leaves the factory, the data table parameters can be updated via a dedicated programming interface to flexibly adapt to different power models and different regional usage environments.

[0029] like Figure 7As shown, the main control MCU chip uses PWM zero-crossing power adjustment to output control signals to the power drive unit. The temperature control response speed during gear switching is ≤100ms, and the steady-state temperature control accuracy of the blower outlet is ±5℃. The main control MCU uses PWM thyristor zero-crossing power regulation to output control signals: the thyristor is triggered to conduct at the zero-crossing point of each AC voltage cycle, and the average output power is adjusted by controlling the proportion of conduction time within half a cycle. This method can significantly reduce electromagnetic interference. The system temperature control response speed and control accuracy parameters are as follows: Gear response speed: The button scanning cycle is 10ms, the MCU table lookup calculation time is less than 1ms, the power drive unit conduction response is less than 50ms, and when the user switches the fan speed, air temperature and air duct mode, the total system response time is ≤100ms. The power adjustment can be completed instantly. There is no temperature detection buffer delay in traditional NTC closed-loop temperature control, and the outlet air temperature does not fluctuate significantly when the gear is switched. Temperature control accuracy: Under rated input voltage and ambient temperature of 25℃, the steady-state temperature deviation between the center point of the air outlet and the target temperature is ≤±3℃, and the temperature deviation of the edge area of ​​the air outlet is ≤±5℃. Even if the input voltage fluctuates by ±15%, the system can still control the temperature deviation within ±5℃ by real-time power compensation through voltage acquisition. The temperature control accuracy is better than that of traditional NTC thermistor temperature control solutions.

[0030] like Figure 7 As shown, the main control MCU chip has built-in over-temperature, over-current, and over-voltage software protection logic. When an abnormal operating condition is detected, the power output of the heating element is immediately cut off through the power drive unit. The power drive unit uses bidirectional thyristors or MOSFETs as power switching devices. The main control MCU chip is an 8-bit or 32-bit low-power MCU with built-in ADC and PWM modules. The system has built-in multiple hardware and software protection mechanisms, and also has flexible hardware selection and adaptation capabilities: Software protection logic: The main control MCU integrates triple software protection programs for over-temperature, over-current, and over-voltage. It monitors the overall bus voltage, heating circuit current, and cumulative heating time in real time. The trigger conditions are as follows: over-voltage protection is triggered when the input voltage exceeds 264V; over-current protection is triggered when the heating circuit current exceeds 1.2 times the rated value; and over-temperature protection is triggered when continuous high-temperature heating exceeds the set time and the heating element is estimated to be over-temperature. After any protection is triggered, the MCU immediately cuts off the power drive unit output and stops the heating element from heating, avoiding dry burning and short circuit faults, and improving the overall reliability of the machine. Power drive unit selection: Components can be flexibly selected according to the model positioning. For small and medium power home models, bidirectional thyristors are used as power switching devices, which have a simple circuit structure and low cost; for high power professional models, MOSFET solutions are used, which have faster switching speed and higher adjustment accuracy. Main control MCU selection: The standard configuration is a low-power MCU with a built-in 12-bit ADC and multiple PWM outputs. Entry-level home models use an 8-bit MCU, such as the STM8S series, which meets basic temperature control requirements and has a low BOM cost. High-end professional models use a 32-bit MCU, such as the STM32G0 series, which has stronger computing power and can support more hair care modes and complex algorithms. Both types of chips have built-in sampling and PWM modules, eliminating the need for external independent function chips, simplifying PCB design and further reducing hardware costs.

[0031] like Figure 7 As shown, the main control MCU chip is used to electrically connect with the water ion generating module of the hair dryer. When the water ion generating module is turned on, the main control MCU chip automatically locks the target air outlet temperature in the water ion activity range of 45℃-65℃, and dynamically adjusts the output power of the water ion generating module according to the real-time working conditions to maintain the stability of water ion concentration and activity. The temperature control system is electrically connected to the water ion generator module of the hair dryer, achieving deep coupling and synergy between temperature control and hair care functions. The specific linkage logic is as follows: Automatic temperature range locking: After the user presses the water ion function button, the MCU automatically recognizes the hair care mode and locks the target air outlet temperature in the optimal activity range of water ions, which is 45℃~65℃. The default optimal value is 55℃. This temperature range ensures basic hair drying efficiency while reducing high-temperature evaporation that could damage the nano water ion structure, thus ensuring the hair care effect from a temperature perspective. Power Adaptive Allocation: The MCU dynamically allocates heating power and water ion module power according to the current operating conditions. Under the premise of constant total power, when the water ion module is working, the MCU fine-tunes the heating power to ensure that the total power does not exceed the limit. When the user switches the air duct mode, the air volume of the outer ring soft wind mode increases and the air temperature decreases slightly. The MCU automatically looks up the table to increase the heating power to compensate, and at the same time increases the high voltage discharge frequency of the water ion generator to increase the amount of water ions generated, offsetting the dilution effect of the air volume and maintaining a stable water ion concentration in the unit volume airflow. Through the triple design of constant temperature range locking, independent low temperature air duct, and concentration adaptive adjustment, the activity and concentration of water ions are maximized. Nano water ions can fully penetrate the hair cuticle, effectively eliminating static electricity, smoothing frizz, and reducing split ends. Long-term use can improve the moisture content and shine of the hair, achieving simultaneous drying and conditioning.

[0032] During operation, the shower-style air outlet component is fixedly installed at the air outlet end of the front of the housing 1. The overall appearance is consistent with the structure of the shower head, with a circular layout. The inside of the component is divided into two completely independent air supply channels with no connection between them by an integrally injection-molded annular sealing partition. The central area is the inner ring main air outlet 12, corresponding to the central air supply channel. The cross-section of the channel is a circular hollow structure. After the airflow is concentrated and gathered, it is blown out to form a high-pressure strong wind zone. The annular area surrounding the outer side of the inner ring is the outer ring secondary air outlet 11, corresponding to the surrounding annular air supply channel. 36 circular air outlet holes are evenly distributed on the end face of the channel. After the airflow is diffused through the holes, it is blown out to form a large area of ​​soft wind zone. The two sets of air ducts are completely physically isolated by a sealed partition, with no airflow passage, allowing for independent conduction and preventing cross-flow. Unlike the traditional through-type dual air duct structure of hair dryers, the mechanical air duct switching mechanism is installed on the air inlet side of the air duct at the air outlet of the unit, located between the heating element and the inlet of the two independent air ducts. This mechanism acts as the actuator for opening and closing the air ducts. The complete transmission assembly includes a lever 14, rack 112, main gear 18, driven gear 110, secondary gear 19, secondary gear 111, air guide plate 113, and air guide plate 114. All gears and racks are fixed to the air duct housing via a rotating shaft. On the plastic bracket, the exposed actuating end of the lever 14 is located on the side of the machine head for easy one-handed operation. The inner side of the lever is injection molded integrally with the rack 112. The lever drives the rack to perform linear reciprocating motion along the machine body axis. The tooth surface of the rack 112 meshes with the external teeth of the main gear 18 for transmission. The main gear 18 simultaneously meshes with the secondary gear 19 and the driven gear 110. The other side of the driven gear 110 meshes with the secondary gear 111, forming a two-stage gear transmission chain. The air guide plate 113 and the air guide plate 114 are arc-shaped damper structures, coaxially fixedly connected to the secondary gear 19 and the secondary gear 111, respectively. The gears rotate synchronously. During operation, the user moves the lever, causing the rack to move horizontally. Through the gear set, the two air guide plates swing synchronously in opposite directions, selectively blocking the air inlet ports of the central or annular air supply duct. This keeps the two ducts in a mutually exclusive state of alternating open and closed flow, ultimately achieving one-button switching between the inner ring strong wind mode and the outer ring gentle wind mode. The hardware carrier of the sensorless open-loop constant temperature control module is the main control PCB board inside the handle. The core units include the main control MCU chip, power drive unit, voltage acquisition unit, and gear input unit. The main control MCU chip has built-in Flash storage. The unit comes pre-loaded with a three-dimensional power mapping data table before leaving the factory. This data table uses fan speed setting, temperature mode, and real-time input voltage as index dimensions, storing the optimal heating power calibration value for each operating condition. The voltage acquisition unit uses a resistor divider circuit connected in parallel to the AC input port to step down the high-voltage AC signal before sending it to the MCU's built-in ADC sampling channel to acquire the input voltage value in real time. The setting input unit is connected to the mode buttons on the handle surface to acquire the user-set fan speed and temperature settings. The power drive unit uses a bidirectional thyristor or MOSFET connected in series in the power supply circuit of the heating element.The MCU receives control signals and adjusts the duty cycle, completely eliminating temperature sensing elements such as NTC thermistors and infrared temperature probes. Instead of relying on temperature feedback to form a closed loop, it achieves constant temperature through open-loop logic of operating condition acquisition, table lookup matching, and power output. The MCU acquires three parameters in real time: input voltage, fan speed, and fan temperature mode. It retrieves a three-dimensional data table to match the target heating power and outputs a PWM control signal to the power drive unit to precisely adjust the output power of the heating element. The outlet temperature is stabilized based on a calibrated power-temperature relationship. The unit supports 100V / 240V dual voltage for global compatibility and offers two fan speed settings (low / high) and two fan temperature settings (warm / hot), forming four combinations: low-speed warm air, low-speed hot air, high-speed warm air, and high-speed hot air. The basic operating settings and power parameters for all settings are pre-written into a data table and uniformly controlled by the MCU. During operation, the air guide vanes 113 and 114 operate in synchronized reverse oscillations under the transmission of the gear set. Simply pushing or pulling the lever 14 in a single direction is sufficient to simultaneously switch the two sets of air ducts on and off. When the user pushes the lever 14 upwards, the rack 112 moves upwards, driving the main gear 18 to rotate clockwise. The main gear 18 directly drives the secondary gear 19 to rotate counterclockwise, causing the air guide vane 113 to oscillate counterclockwise, closing the inner ring air duct inlet. Simultaneously, the main gear 18 drives the driven gear 110 to rotate counterclockwise, which in turn drives the secondary gear 111 to rotate clockwise, causing the air guide vane 114 to oscillate clockwise, opening... When the outer ring air duct inlet is opened, the entire unit switches to the outer ring gentle wind mode. Conversely, when the lever 14 is pushed down, the air guide plate 113 swings clockwise to open the inner ring air duct, and the air guide plate 114 swings counterclockwise to close the outer ring air duct, switching to the inner ring strong wind mode. The swing angles of the two air guide plates are completely synchronized and opposite in direction, with no intermediate semi-conducting state. There is no mixed airflow when the air duct switches, and the air field pattern changes cleanly and thoroughly. Compared with the traditional multi-directional linkage damper structure, the single linear toggle operation logic is more in line with user habits, allowing for blind operation with one hand. During use, the rack 112, main gear 18, driven gear 110, secondary gear 19, and secondary gear 111 all adopt a standard gear design with a unified module, m=0.5, conforming to GB / T1. The 357 cylindrical gear module standard ensures consistent meshing clearance for all teeth, resulting in lossless multi-stage transmission, perfectly synchronized rotation, and operating noise below 35dB. Optimized gear ratio design achieves a small stroke and large angle switching effect. The rack 112 requires only a 4mm linear drive stroke to rotate the entire gear set synchronously by two tooth pitches, ultimately driving the first air guide plate 113 and the second air guide plate 114 to complete an 80° rotational opening and closing angle. This angle is sufficient to completely cover the air inlet of the corresponding air duct, achieving a completely sealed switching of the air duct with a leakage rate of less than 5%. Compared to traditional linkage damper mechanisms requiring more than 15mm of actuation stroke, this multi-stage gear amplification mechanism reduces the switching stroke by more than 70%, and the axial thickness of the entire mechanism is only 8mm.This allows for a 60% reduction in the internal space occupied by the hair dryer, freeing up space for optimizing the airflow curvature. During use, two airflow modes are designed for different hair care needs, with distinct differences in airflow characteristics and applicable scenarios. The first is the inner ring strong wind mode, where the main inner ring outlet outputs a concentrated, high-pressure columnar airflow. At high speed, the center wind speed at the outlet can reach 12m / s, resulting in concentrated air pressure and strong penetration, reaching directly to the hair roots to quickly evaporate deep-seated moisture. Drying efficiency is more than 30% higher than traditional single-outlet modes, suitable for quickly drying thick, dense hair after washing, solving the uneven drying problem of traditional hair dryers where the surface is dry while the roots are wet. The second is the outer ring soft wind mode, where the outer ring secondary outlet uses a ring-shaped multi-hole showerhead-style airflow. 36 air outlets are arranged at a 15° diffusion angle, resulting in a gentle and dispersed airflow. The overall airflow coverage diameter is 80% larger than traditional single-outlet modes, allowing for large-area coverage of the entire hair strand. During use, the red... The external therapeutic lamp assembly 13 features eight far-infrared LED beads with a wavelength of 630nm evenly arranged in a ring around the outer ring of the secondary air outlet 11. These LEDs illuminate synchronously with the entire unit during airflow, and the infrared light irradiates the scalp area in sync with the airflow. The adaptive water ion generator module is centrally located at the air outlet and employs a condensation-type high-pressure atomization structure, including a semiconductor cooling condenser, a high-pressure discharge needle, and an independent air delivery channel. During operation, the semiconductor cooling condenses water vapor in the air, forming condensate. This condensate is then ionized and broken down by a high voltage of over 1000V, generating nano-sized water ions with a particle size of 50-200nm. These water ions are delivered through the central independent air duct, ensuring the airflow does not pass through the heating area of ​​the heating element. The outlet temperature is 10-15℃ lower than the main air temperature, reducing the risk of high-temperature evaporation damaging the ion structure. The water ion retention rate can reach over 90%, allowing it to penetrate deep into the hair cuticle with the airflow for a moisturizing and hair-care effect.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A shower-type hair dryer, comprising a body housing (1), a blower motor and a heating element disposed inside the body housing (1), characterized in that: The body housing (1) is equipped with a shower-type air outlet assembly, a mechanical air duct switching mechanism and a sensorless open-loop constant temperature control module. The shower-type air outlet assembly is located at the air outlet end of the body housing (1) and is arranged in a ring-shaped shower layout. It has an inner ring main air outlet (12) and an outer ring secondary air outlet (11) that are independent of each other and whose air supply ducts are not connected. The inner ring main air outlet (12) corresponds to the central air supply duct, and the outer ring secondary air outlet (11) corresponds to the surrounding ring air supply duct. The mechanical air duct switching mechanism is located on the air inlet side of the air duct inside the housing (1), and includes a lever (14), a rack (112), a main gear (18), a driven gear (110), a first secondary gear (19), a second secondary gear (111), a first air guide plate (113), and a second air guide plate (114); the lever (14) is fixedly linked with the rack (112), the rack (112) meshes with the main gear (18), and the main gear (18)... They mesh with secondary gear one (19) and driven gear (110) respectively. The driven gear (110) meshes with secondary gear two (111). The air guide plate one (113) and air guide plate two (114) are coaxially linked with secondary gear one (19) and secondary gear two (111) respectively. As the gear set rotates, they selectively block the air inlet of the central air supply duct or the ring air supply duct, so that the two sets of air ducts are in a mutually exclusive conduction state, realizing the switching between the inner ring strong wind mode and the outer ring gentle wind mode. The sensorless open-loop constant temperature control module includes a main control MCU chip, a power drive unit, a voltage acquisition unit, and a gear input unit. The main control MCU chip has a built-in storage unit containing a three-dimensional power mapping data table. The data table maps the target heating power values ​​corresponding to the fan speed level, the air temperature mode, and the input voltage. The main control MCU chip obtains the real-time input voltage through the voltage acquisition unit and the current fan speed and air temperature level through the gear input unit. After matching the corresponding target heating power by looking up the table, it outputs a control signal to the power drive unit to adjust the output power of the heating element, thereby maintaining a constant outlet air temperature in a sensorless open-loop control mode.

2. A shower-type hair dryer according to claim 1, characterized in that: The first air guide plate (113) and the second air guide plate (114) swing synchronously in opposite directions under the transmission of the gear set, and the lever (14) can switch the two sets of air ducts on and off by moving in a straight line in a single direction.

3. A shower-type hair dryer according to claim 2, characterized in that: The rack (112), main gear (18), driven gear (110) and secondary gear one (19) and secondary gear two (111) have the same gear module. When the linear push stroke of the rack (112) is 4mm, it can drive the air guide plate one (113) and air guide plate two (114) to complete an 80° rotation opening and closing angle through the gear set, so as to realize the complete switching of the two sets of air ducts.

4. A shower-type hair dryer according to claim 3, characterized in that: The inner ring strong wind mode outputs concentrated high-pressure airflow for quick hair drying, while the outer ring soft wind mode outputs diffused multi-hole soft wind, significantly increasing the wind field coverage area for hair smoothing, styling, and hair care.

5. A shower-type hair dryer according to claim 4, characterized in that: The outer ring of the shower-type air outlet (11) is equipped with an infrared therapy lamp group (13). The hair dryer also includes an adaptive water ion generating module, which is located at the center of the air outlet and the water ion airflow it outputs does not pass through the heating element.

6. A smart pattern recognition system for a shower-type hair dryer, applied to a shower-type hair dryer as described in any one of claims 1-5, characterized in that, This system is a sensorless open-loop temperature control system: This includes the main control MCU chip, power drive unit, voltage acquisition unit, and gear input unit; The main control MCU chip has a built-in storage unit, which contains a three-dimensional power mapping data table. The data table maps the target heating power value corresponding to the wind speed setting, wind temperature mode, and input voltage. The voltage acquisition unit is used to acquire the real-time voltage value of the mains power input and transmit it to the main control MCU chip; The gear input unit is used to receive the wind speed gear and wind temperature mode signals set by the user and transmit them to the main control MCU chip. The main control MCU chip matches the corresponding target heating power from the three-dimensional power mapping data table based on the real-time input voltage, current wind speed setting, and wind temperature mode, and outputs a control signal to the power drive unit. The power drive unit adjusts the output power of the hair dryer's heating element to maintain a constant air outlet temperature in an open-loop control manner.

7. The intelligent pattern recognition system for a showerhead-type hair dryer according to claim 6, characterized in that: The three-dimensional power mapping data table covers all combinations of operating conditions with dual input voltage, two fan speeds, and two air temperatures. The dual input voltages are 100V and 240V, the two fan speeds are low speed and high speed, and the two air temperatures are warm air and hot air, forming a total of four sets of fan speed and air temperature combinations.

8. The intelligent pattern recognition system for a showerhead-type hair dryer according to claim 7, characterized in that: The main control MCU chip uses PWM zero-crossing power adjustment to output control signals to the power drive unit. The temperature control response speed during gear switching is ≤100ms, and the steady-state temperature control accuracy of the blower outlet is ±5℃.

9. The intelligent pattern recognition system for a showerhead-type hair dryer according to claim 8, characterized in that: The main control MCU chip has built-in over-temperature, over-current, and over-voltage software protection logic. When an abnormal operating condition is detected, the power output of the heating element is immediately cut off through the power drive unit. The power drive unit uses bidirectional thyristor or MOSFET as power switching devices. The main control MCU chip is an 8-bit or 32-bit low-power MCU with built-in ADC and PWM modules.

10. The intelligent pattern recognition system for a showerhead-type hair dryer according to claim 9, characterized in that: The main control MCU chip is used to electrically connect with the water ion generating module of the hair dryer. When the water ion generating module is turned on, the main control MCU chip automatically locks the target air outlet temperature within the water ion activity range of 45℃-65℃, and dynamically adjusts the output power of the water ion generating module according to the real-time working conditions to maintain the stability of water ion concentration and activity.

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