Double-temperature hair dryer and intelligent control system thereof

Abstract

The invention belongs to the technical field of intelligent control, and particularly relates to a double-temperature blower and an intelligent control system thereof, which comprise a high-speed motor assembly, a circuit control board assembly, a heating frame assembly, an air duct inner cylinder, an air duct outer cylinder, a shunting cover assembly and an air outlet net assembly, the high-speed motor assembly serves as a unique power source and is installed at the tail of the machine body, and an air outlet of the high-speed motor assembly faces the front end of the machine body. The flow dividing cover assembly is arranged on the downstream portion of an air outlet of the high-speed motor assembly, located on the upstream portion of the heating frame assembly and used for dividing the single high-speed airflow generated by the high-speed motor assembly into two independent airflow paths. Under the driving of a single high-speed motor, original airflow is precisely divided into two independent paths, namely a main air duct and an outer air duct, by utilizing the flow dividing cover assembly; main air duct airflow is output as working airflow after being heated by the heating frame assembly, and the temperature is accurately regulated and controlled by the circuit control board assembly according to a user instruction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of intelligent control, and particularly relates to a dual-temperature hair dryer and an intelligent control system thereof. BACKGROUND

[0002] In the field of beauty and hair care products, handheld hair dryers are an important tool for daily care, and their performance directly affects the user's experience and drying efficiency. There are many types of hair dryers on the market, including large models with DC motors, lightweight and compact high-speed motor hair dryers, straight or curved tube structure designs, and some high-end products that use a dual-motor dual-air duct solution. Although these products are constantly optimized in terms of air volume, noise, size, etc., there are still obvious deficiencies in the stability of hot air output. Existing hair dryers generally only have one main air duct, and the hot air flow is directly exposed to the ambient air after leaving the air outlet, which is easily affected by the ambient temperature. For example, in a low-temperature environment (such as 12℃), even if the hair dryer is set to output 90℃ hot air, the actual temperature acting on the hair will be significantly reduced due to the contact of the airflow with cold air during transmission and rapid heat dissipation, resulting in a decrease in drying efficiency. To compensate for this problem, some products are forced to increase the set temperature of the hot air, but this can cause overheating and discomfort in a high-temperature environment (such as 30℃), affecting the user experience. Therefore, the core defect of the prior art is that the single air duct structure cannot effectively isolate the hot air flow from the ambient air, resulting in significant interference of the hot air temperature by the external environment, making it difficult to maintain consistent drying efficiency and comfort in different use scenarios. Therefore, a dual-temperature hair dryer and an intelligent control system thereof are proposed to solve the above problems. SUMMARY

[0003] The purpose of the present application is to solve the problem that the main airflow of the existing hair dryer is directly exposed to the ambient air when using the hot air mode, resulting in a significant impact of the actual temperature acting on the hair by the ambient temperature (especially in a low-temperature environment), thereby reducing the drying efficiency and consistency of the user experience. Although some products in the prior art compensate by increasing the set temperature, this method can cause overheating and discomfort in a high-temperature environment, and the overall structure does not fundamentally solve the problem of heat exchange between the main airflow and the ambient air. Therefore, the present application proposes a dual-air duct structure solution based on single-motor driving, which reduces the interference of the environment on the main hot air flow through physical isolation means without adding additional power sources.

[0004] The application provides a double-temperature hair dryer, which comprises a high-speed motor assembly, a circuit control board assembly, a heating frame assembly, an air duct inner tube, an air duct outer tube, a flow splitting cover assembly and an air outlet net assembly; wherein the high-speed motor assembly is installed at the tail of the body as the only power source, and the air outlet thereof faces the front end of the body; the flow splitting cover assembly is arranged downstream of the air outlet of the high-speed motor assembly and upstream of the heating frame assembly, and is used for splitting the single high-speed airflow generated by the high-speed motor assembly into two independent airflow paths; one airflow enters the inside of the heating frame assembly through the central through hole of the flow splitting cover assembly, is heated and then conveyed forward along the main air duct formed by the air duct inner tube, thereby forming the main airflow; the other airflow bypasses the outer periphery of the heating frame assembly, is conveyed forward along the outer air duct formed by the annular gap between the air duct inner tube and the air duct outer tube, thereby forming the auxiliary airflow; the temperature of the main airflow is regulated by the circuit control board assembly according to the user operation instruction, and can be switched between the high-temperature range (90-100 DEG C), the medium-temperature range (70-80 DEG C) or the normal-temperature range; the auxiliary airflow is not actively heated, and only slightly heated due to flowing through the outer wall of the heating frame assembly, and the temperature thereof is always maintained at a level slightly higher than the ambient temperature, specifically: when the main airflow is in the high-temperature range, the temperature of the auxiliary airflow is 45-55 DEG C; when the main airflow is in the medium-temperature range, the temperature of the auxiliary airflow is 35-45 DEG C; when the main airflow is in the normal-temperature range, the temperature of the auxiliary airflow is consistent with the ambient temperature; at the air outlet, the auxiliary airflow surrounds the main airflow to form a continuous warm air protection layer, which blocks the direct contact and heat exchange of the ambient cold air with the main airflow, so that the effective temperature of the main airflow when reaching the user's hair position is maintained.

[0005] Further, the flow splitting cover assembly comprises an upper flow splitting cover and a lower flow splitting cover, which are fixed by buckling or screw cooperation and clamp the circuit control board assembly therebetween; the inner sides of the upper flow splitting cover and the lower flow splitting cover jointly enclose the central through hole and the annular flow guide cavity; the central through hole is aligned with the air inlet end of the heating frame assembly, and constitutes the air inlet path of the main air duct; the annular flow guide cavity is arranged around the central through hole, and a gap is left between the outer edge thereof and the outer wall of the air duct inner tube, thereby constituting the air inlet path of the outer air duct; after the high-speed airflow flows out of the air outlet of the high-speed motor assembly, the airflow in the central region thereof first impacts the inner surface of the flow splitting cover assembly, and the airflow in the peripheral region thereof enters the annular gap between the air duct inner tube and the air duct outer tube along the annular flow guide cavity.

[0006] Further, the heating frame assembly is a cylindrical resistance wire heating structure, the outer periphery of which is covered with a mica cylinder, the two ends of which abut with the shunt cover assembly and the rear end of the air duct inner cylinder respectively, realizing axial positioning and electrical insulation; the air duct inner cylinder is a hollow cylindrical structure, the inner diameter of which matches the outer diameter of the heating frame assembly, the front end of which is connected with the inner ring of the air outlet net assembly, and the rear end of which is limited and sealed through the center through hole of the shunt cover assembly; the air duct outer cylinder is a concentric cylindrical structure which is sleeved outside the air duct inner cylinder, the inner diameter of which is larger than the outer diameter of the air duct inner cylinder, and the annular channel with a width of 2-5mm is formed between the two, which constitutes the main part of the outer air duct; the rear end of the air duct outer cylinder is supported and fixed by the upper motor support and the lower motor support, and the front end is matched with the outer ring of the air outlet net assembly and is limited by the clamping groove or screw thread structure, ensuring that the air duct inner cylinder and the air duct outer cylinder remain coaxial and the gap is constant in the whole machine assembly state.

[0007] Further, the air outlet net assembly includes an inner net cover and an outer net cover, the inner net cover corresponding to the main air duct outlet is provided with dense small holes to homogenize the main airflow, and the outer net cover corresponding to the outer air duct outlet is provided with annularly distributed strip-shaped air outlet holes, so that the auxiliary airflow is wrapped in the form of a ring and is discharged; the inner net cover and the outer net cover are integrally formed or assembled separately and are embedded in the step structure formed by the front ends of the air duct inner cylinder and the air duct outer cylinder, realizing physical separation and airflow guiding of the double air duct outlets.

[0008] Further, the hair dryer further includes an air inlet filtering system which is arranged at the air inlet of the tail of the machine body and is composed of a hardware filter screen and a nylon filter screen which are stacked; the hardware filter screen is located on the outside and is used for intercepting large particles of dust and hair; the nylon filter screen is located on the inside and is used for filtering small dust; the two together cover the air inlet area of the high-speed motor assembly, preventing foreign matters from entering the inside of the high-speed motor assembly to cause abrasion or short circuit.

[0009] Further, the hair dryer is provided with a key assembly, including a power key and a wind temperature switching key, both electrically connected to the circuit control board assembly; the circuit control board assembly has a built-in control program, which performs the following operations according to the key signal: S1, detecting whether the power key is pressed for more than 1 second, if yes, starting the high-speed motor assembly and entering the high-temperature mode by default, at this time the heating frame assembly is powered to heat to 90-100℃, the main airflow temperature is set to high-temperature mode, and the auxiliary airflow is heated to 45-55℃ due to flowing through the outer wall of the heating frame assembly; S2, detecting whether the wind temperature switching key is pressed, if yes, switching to the medium-temperature mode, the power of the heating frame assembly is reduced, the main airflow temperature is adjusted to 70-80℃, and the auxiliary airflow temperature is correspondingly reduced to 35-45℃; S3, detecting again whether the wind temperature switching key is pressed, if yes, switching to the normal-temperature mode, the heating frame assembly is powered off, neither the main airflow nor the auxiliary airflow is heated, and the temperature is equal to the ambient temperature; S4, in the high-temperature mode and the medium-temperature mode, the control program continuously monitors the temperature of the heating frame assembly and adjusts the power supply through the PWM signal to make the main airflow temperature stable within the set range, while ensuring that the auxiliary airflow temperature is always 5-15℃ higher than the ambient temperature to maintain its environmental isolation function.

[0010] In particular, the airflow distribution ratio of the main air duct and the outer air duct is determined by the geometry of the shunt cover assembly; the cross-sectional area of the central through hole accounts for 60%-70% of the total cross-sectional area of the air outlet of the high-speed motor assembly, and the flow-through cross-sectional area of the annular flow guide cavity accounts for 30%-40%; this ratio design makes the main airflow have sufficient flow to achieve efficient drying, while the auxiliary airflow has sufficient volume flow to form a continuous and stable annular protective layer; under the working condition that the rotating speed of the high-speed motor assembly is 100-120 thousand rpm, the wind speed of the main airflow is 5-25 m / s, and the wind speed of the auxiliary airflow is 5-20 m / s, both are synchronously ejected at the air outlet, and the auxiliary airflow forms a dynamic heat shield at the periphery.

[0011] Further, the inner cylinder of the air duct and the outer cylinder of the air duct are both made of heat-resistant engineering plastic, the material is polyphenylene sulfide (PPS) or liquid crystal polymer (LCP) or PA66 and PA66 plus percentage glass fiber (GF), and the heat distortion temperature is not less than 260℃; the inner wall of the inner cylinder of the air duct is smooth, with a surface roughness Ra≤0.8μm, to reduce the flow resistance of the main airflow; the inner wall of the outer cylinder of the air duct is provided with a plurality of axial reinforcing ribs, which not only enhance the structural rigidity, but also guide the stable flow of the auxiliary airflow along the axial direction to avoid vortex.

[0012] Further, the mica cylinder is a multi-layer composite structure, which is hot-pressed by two layers of mica sheets clamping one layer of glass fiber cloth, with a thickness of 0.3-0.5mm and a dielectric strength ≥20kV / mm, used to isolate the electrical connection between the heating frame assembly and the inner cylinder of the air duct, and to radiate heat to the main air duct, reducing heat loss to the periphery, thereby controlling the temperature rise of the auxiliary airflow within the preset range.

[0013] Further, the high-speed motor assembly adopts a brushless DC motor with a rated voltage of DC 140-310V, and is driven by a driving signal provided by the circuit control board assembly to run at a constant speed; the motor housing is fixed with the upper motor support and the lower motor support through interference fit or ultrasonic welding to ensure no axial movement during operation and maintain the stability of the airflow path.

[0014] The application achieves the following technical effects through the above structure: Under the drive of a single high-speed motor, the original airflow is accurately divided into two independent paths of the main air duct and the outer air duct by the shunt cover assembly; the airflow in the main air duct is heated by the heating frame assembly and then output as working airflow, and its temperature is accurately controlled according to user instructions by the circuit control board assembly; the airflow in the outer air duct bypasses the periphery of the heating frame assembly, is moderately heated, and is output as auxiliary airflow to form a temperature gradient protection layer around the main airflow at the air outlet; the protection layer effectively blocks the direct heat exchange between the ambient cold air and the main hot airflow, and in particular in the scenario where the ambient temperature is lower than 15℃, the temperature attenuation of the main airflow when reaching the hair position can be reduced by more than 30%; since no second motor or additional heating element is needed, the overall structure is compact, the assembly process is compatible with the existing single air duct hair dryer, and the manufacturing cost is limitedly increased. At the same time, the temperature of the auxiliary airflow is controlled in linkage with the working state of the main airflow, and is always maintained in the range of 5-15℃ higher than the ambient temperature, which not only ensures the isolation effect, but also avoids the risk of scalding caused by overheating of the outer circle airflow; in the normal temperature mode, the ambient temperature airflow is output synchronously by the double air ducts, which can be used for styling or cooling and setting, and expands the product function boundary. This structure fundamentally solves the performance fluctuation problem of the existing hair dryer due to poor environmental adaptability, so that users can obtain consistent dry hair efficiency and comfortable experience in different seasons and regional environments. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings described below only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] In the drawings: Fig. 1 It is a schematic diagram of the overall structure of the dual-temperature hair dryer of the application; Fig. 2 It is an exploded schematic diagram of the components of the dual-temperature hair dryer of the application; Fig. 3 It is a schematic diagram of the airflow isolation principle of the main air duct and the outer air duct of the dual-temperature hair dryer of the application.

[0017] LEGEND: 1, high-speed motor assembly; 2, circuit control board assembly; 3, heating frame assembly; 4, mica cylinder; 5, air duct inner cylinder; 6, air duct outer cylinder; 7, air outlet net assembly; 8, front ring; 9, hardware filter screen; 10, nylon filter screen; 11, rear cover; 12, button assembly; 13, upper shunt cover; 14, lower shunt cover; 15, upper motor support; 16, lower motor support; 17, wire end sleeve; 18, upper body; 19, lower body. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0019] The specific embodiments are given below.

[0020] Embodiment Please refer to Figs. 1-3 The present application provides a dual-temperature hair dryer and an intelligent control system thereof. The dual-temperature hair dryer of the embodiment is assembled by multiple functional components, including a high-speed motor assembly 1, a circuit control board assembly 2, a heating frame assembly 3, a mica cylinder 4, an air duct inner cylinder 5, an air duct outer cylinder 6, an air outlet net assembly 7, a front ring 8, a hardware filter screen 9, a nylon filter screen 10, a rear cover 11, a button assembly 12, an upper shunt cover 13, a lower shunt cover 14, an upper motor support 15, a lower motor support 16, a wire end sleeve 17, an upper body 18, and a lower body 19. The above components are integrated in the hair dryer shell according to specific assembly relationship, forming a single-motor dual-air duct system with compact structure and complete functions.

[0021] In the specific assembly process, first, the high-speed motor assembly 1 is installed at the tail of the fuselage, with its air outlet facing the front end of the fuselage, and is fixed axially and radially by the upper motor support 15 and the lower motor support 16, ensuring that the high-speed motor assembly 1 does not displace or vibrate during operation. The high-speed motor assembly 1 is a brushless DC motor with a rated voltage of DC 140-310V, which runs at a constant speed of 100-120 thousand rpm under the control of the driving signal output by the circuit control board assembly 2. Under the working condition of the high-speed motor assembly rotating at 100-120 thousand rpm, the main airflow speed is 5-25 m / s, and the auxiliary airflow speed is 5-20 m / s. Both are synchronously ejected at the air outlet, and the auxiliary airflow forms a dynamic heat shield on the periphery, continuously generating a high-speed airflow. After the airflow flows out of the air outlet of the high-speed motor assembly 1, it first enters the internal part of the shunt cover assembly composed of the upper shunt cover 13 and the lower shunt cover 14. The upper shunt cover 13 and the lower shunt cover 14 are connected by buckle structure or screw fastening, and the inner sides of the two together enclose a central through hole and an annular flow guide cavity around the through hole. The cross-sectional area of the central through hole accounts for 65% of the total cross-sectional area of the air outlet of the high-speed motor assembly 1, and the flow cross-sectional area of the annular flow guide cavity accounts for 35%, thereby realizing accurate distribution of the original airflow. After the high-speed airflow impacts the inner surface of the shunt cover assembly, the airflow in the central area passes through the central through hole into the internal part of the heating frame assembly 3 downstream, forming the main air duct airflow; while the airflow in the peripheral area enters the annular gap between the air duct inner cylinder 5 and the air duct outer cylinder 6 along the annular flow guide cavity, forming the outer air duct airflow.

[0022] The heating frame assembly 3 is a cylindrical resistance wire heating structure, which is tightly wrapped with a layer of mica cylinder 4. The mica cylinder 4 is hot-pressed from two layers of mica sheets clamping a layer of glass fiber cloth, with a thickness of 0.4mm, excellent electrical insulation performance (dielectric strength ≥20kV / mm) and high temperature resistance characteristics, which can effectively isolate the electrical connection between the heating frame assembly 3 and the air duct inner cylinder 5, and concentrate heat radiation to the main air duct, reducing heat loss to the periphery. The rear end of the heating frame assembly 3 is limited and sealed by the central through hole of the shunt cover assembly, and the front end is inserted into the rear end of the air duct inner cylinder 5 and tightly matched with it, ensuring the air tightness of the main air duct. The air duct inner cylinder 5 is a hollow cylindrical structure with an inner diameter matching the outer diameter of the heating frame assembly 3, a smooth inner wall with a surface roughness Ra ≤0.8μm to reduce the flow resistance of the main airflow; its front end is connected with the inner ring of the air outlet net assembly 7. The air duct outer cylinder 6 is a cylindrical structure concentrically arranged outside the air duct inner cylinder 5, forming an annular channel with a width of 3.5mm between them, which is the main part of the outer air duct. The rear end of the air duct outer cylinder 6 is supported and fixed by the upper motor support 15 and the lower motor support 16, and the front end is limited by the outer ring of the air outlet net assembly 7 through the clamping groove structure, ensuring that the air duct inner cylinder 5 and the air duct outer cylinder 6 remain coaxial and the gap remains constant during the entire working process.

[0023] The air outlet net assembly 7 comprises an inner net cover and an outer net cover which are integrally formed. The inner net cover corresponds to the main air duct outlet and is provided with dense small holes to homogenize the main airflow. The outer net cover corresponds to the outer air duct outlet and is provided with annularly distributed strip-shaped air outlet holes, so that the auxiliary airflow is wrapped around the main airflow in a continuous annular shape and is discharged. At the air outlet, the main airflow is located in the central area, and the auxiliary airflow surrounds the outer periphery thereof, forming a dynamic warm air protection layer. The protection layer effectively blocks the direct contact of the ambient cold air with the main hot air flow, significantly reducing heat exchange loss.

[0024] The air inlet system is arranged at the tail of the machine body and is composed of a metal filter screen 9 and a nylon filter screen 10 which are stacked. The metal filter screen 9 is located on the outer side and is used to intercept large-particle foreign matters such as hair and paper scraps. The nylon filter screen 10 is located on the inner side and is used to filter small dust. The two together cover the air inlet area of the high-speed motor assembly 1, preventing foreign matters from entering the motor interior to cause abrasion or short circuit and ensuring long-term stable operation.

[0025] The whole machine shell is composed of an upper body 18 and a lower body 19 which are spliced together and internally accommodate core working components. The key assembly 12 is embedded on the surface of the upper body 18 and includes a power key and a wind temperature switching key which are both electrically connected to the circuit control board assembly 2. The circuit control board assembly 2 is clamped and fixed between the upper shunt cover 13 and the lower shunt cover 14, and the control program built therein performs the following logic: S1, detecting whether the power key is pressed for more than 1 second, if yes, starting the high-speed motor assembly 1 and entering the high-temperature mode by default, at this time, the heating frame assembly 3 is powered to heat to 90-100℃, and the main airflow temperature is set to the high-temperature mode. Since the auxiliary airflow flows through the outer wall of the heating frame assembly 3 and is affected by the heat conduction of the mica cylinder 4, its temperature rises to 45-55℃, which is slightly higher than the typical winter ambient temperature (such as 12℃), thereby forming an effective heat shield at the air outlet. S2, when the user presses the wind temperature switching key, the control program switches to the medium-temperature mode, the power supply of the heating frame assembly 3 is reduced, the main airflow temperature is adjusted to 70-80℃, and the auxiliary airflow is correspondingly reduced to 35-45℃ due to the decrease of the heat source temperature, which is still higher than the ambient temperature, thereby maintaining the isolation function. S3, pressing the wind temperature switching key again, entering the normal-temperature mode, the heating frame assembly 3 is powered off, and neither the main airflow nor the auxiliary airflow is heated, and the temperature is equal to the ambient temperature. At this time, the outer air duct has no protection effect, but can be used for styling cooling or sensitive scalp care. S4, during the operation in the high-temperature mode and the medium-temperature mode, the control program monitors the temperature of the heating frame assembly 3 in real time through the temperature sensor and dynamically adjusts the power supply by using the PWM signal, so that the main airflow temperature is stabilized in the set range, and at the same time, the auxiliary airflow temperature is always 5-15℃ higher than the ambient temperature, so as to maintain its environmental interference absorption capacity.

[0026] In actual use scenarios, for example, a user is in a winter indoor environment with an ambient temperature of 12℃, and the high-temperature mode of the hair dryer is turned on. After the high-speed motor assembly 1 is started, the airflow is divided by the airflow dividing cover assembly: the main airflow is heated to about 95℃ by the heating frame assembly 3 and is transported forward along the inner cylinder 5 of the air duct; the auxiliary airflow is heated to about 50℃ after absorbing part of the radiant heat around the outer periphery of the heating frame assembly 3 and flows forward along the annular gap between the inner cylinder 5 of the air duct and the outer cylinder 6 of the air duct. The two airflows are synchronously emitted from the air outlet net assembly 7, and the auxiliary airflow forms a continuous warm air layer on the periphery to wrap the high-temperature main airflow in the center. When the airflow propagates to the hair position about 15 cm away from the air outlet, the main airflow temperature attenuation is significantly smaller than that of the conventional single-air-duct hair dryer because the auxiliary airflow blocks the invasion of the ambient cold air. Experimental data show that, under the same working conditions, the temperature of the main airflow of the conventional hair dryer decreases to about 65℃ when it reaches the hair, while the temperature of the product of the present application can be maintained above about 80℃, and the hair drying efficiency is increased by more than 30%.

[0027] The inner cylinder 5 of the air duct and the outer cylinder 6 of the air duct are both made of heat-resistant engineering plastic, preferably polyphenylene sulfide (PPS) or liquid crystal polymer (LCP), with a heat distortion temperature not less than 260℃, which can withstand long-term high-temperature airflow erosion without deformation. The inner wall of the outer cylinder 6 of the air duct is provided with a plurality of axial stiffeners, which not only enhance the structural rigidity, but also guide the stable flow of the auxiliary airflow along the axial direction, avoiding the generation of vortex or backflow in the annular gap, and ensuring the uniform and continuous wrapping of the auxiliary airflow around the main airflow.

[0028] In summary, the present embodiment is driven by a single high-speed motor assembly 1, and the original airflow is accurately divided into two independent paths of the main air duct and the outer air duct by the airflow dividing cover assembly (13, 14); the main air duct airflow is heated by the heating frame assembly 3 and then output as the working airflow, whose temperature is controlled by the circuit control board assembly 2 according to the user's instruction; the outer air duct airflow is moderately heated by passing around the outer periphery of the heating frame assembly 3 and then output as the auxiliary airflow, which forms a temperature gradient protection layer around the main airflow at the air outlet; this structure does not need to add a second motor or additional heating elements, the whole machine structure is compact, the assembly process is highly compatible with the existing single-air-duct hair dryer, and the manufacturing cost increases limitedly; at the same time, the temperature of the auxiliary airflow is controlled by the working state of the main airflow, which is always maintained in a reasonable range of 5-15℃ higher than the ambient temperature, which not only ensures the environmental isolation effect, but also avoids the risk of overheating of the outer circle; in the normal temperature mode, the double air ducts output ambient temperature airflow synchronously, which expands the product function. This technical solution fundamentally solves the performance fluctuation problem of the existing hair dryer due to poor environmental adaptability, so that the user can obtain consistent hair drying efficiency and comfortable experience in different seasons and regional environments.

[0029] In the description of the present application, it needs to be understood that the terms "front and back", "left and right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0030] Of course in the present technical solution, those skilled in the art should understand that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple. The term "one" cannot be understood as a limitation on the number.

[0031] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements easily thought of by those skilled in the art under the technical hints of the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A dual-temperature hair dryer, characterized in that, It includes a high-speed motor assembly (1), a circuit control board assembly (2), a heating frame assembly (3), an inner cylinder of the air duct (5), an outer cylinder of the air duct (6), a diversion cover assembly, and an air outlet mesh assembly (7). The high-speed motor assembly (1) is installed at the rear of the machine body, with its air outlet facing the front of the machine body; the diversion cover assembly is located downstream of the air outlet of the high-speed motor assembly (1) and upstream of the heating frame assembly (3), and is used to divide the single high-speed airflow generated by the high-speed motor assembly (1) into two independent airflow paths. One airflow enters the heating frame assembly (3) through the central through hole of the diversion cover assembly. After being heated, it is transported forward along the main airflow formed by the inner cylinder of the air duct (5) to form the main airflow. Another airflow bypasses the outer periphery of the heating frame assembly (3) and is transported forward along the outer air duct formed by the annular gap between the inner cylinder (5) and the outer cylinder (6) of the air duct, forming an auxiliary airflow; The temperature of the main airflow is controlled by the circuit control board assembly (2) according to the user's operation instructions, and can be switched between 90-100℃, 70-80℃ or ambient temperature; the auxiliary airflow is not actively heated, but only heats up because it flows through the outer wall of the heating frame assembly (3), and its temperature is always 5-15℃ higher than the ambient temperature, and forms a continuous warm air protection layer around the main airflow at the air outlet.

2. A dual-temperature hair dryer according to claim 1, characterized in that: The diversion cover assembly includes an upper diversion cover (13) and a lower diversion cover (14), which are fixed together by buckles or screws and clamp the circuit control board assembly (2) therebetween; the inner sides of the upper diversion cover (13) and the lower diversion cover (14) together form a central through hole and an annular guide cavity; the central through hole is aligned with the air inlet end of the heating frame assembly (3) to form the air inlet path of the main air duct; the annular guide cavity is arranged around the central through hole, and its outer edge is left with a gap between it and the outer wall of the inner cylinder (5) of the air duct to form the air inlet path of the outer air duct.

3. A dual-temperature hair dryer according to claim 2, characterized in that: The cross-sectional area of ​​the central through hole accounts for 60%-70% of the total cross-sectional area of ​​the air outlet of the high-speed motor assembly (1), and the flow cross-sectional area of ​​the annular guide cavity accounts for 30%-40%.

4. A dual-temperature hair dryer according to claim 1, characterized in that: The heating frame assembly (3) is a cylindrical resistance wire heating structure, with a mica tube (4) covering its outer periphery. The two ends of the mica tube (4) are respectively connected to the rear ends of the diversion cover assembly and the inner tube (5) of the air duct. The inner tube (5) of the air duct is a hollow cylindrical structure with its inner diameter matching the outer diameter of the heating frame assembly (3). Its front end is connected to the inner ring of the air outlet mesh assembly (7), and its rear end is limited and sealed by the central through hole of the diversion cover assembly. The outer tube (6) of the air duct is a concentric cylindrical structure fitted outside the inner tube (5) of the air duct. Its inner diameter is larger than the outer diameter of the inner tube (5), and the two form an annular channel with a width of 2-5mm.

5. A dual-temperature hair dryer according to claim 1, characterized in that: The mica tube (4) is a multi-layer composite structure, which is formed by hot pressing two layers of mica sheets sandwiching a layer of glass fiber cloth. The thickness is 0.3-0.5mm and the dielectric strength is ≥20kV / mm.

6. A dual-temperature hair dryer according to claim 1, characterized in that: The air outlet mesh assembly (7) includes an inner mesh cover and an outer mesh cover. The inner mesh cover corresponds to the main air duct outlet and is provided with dense small holes. The outer mesh cover corresponds to the outer air duct outlet and is provided with strip-shaped air outlet holes distributed in a ring. The inner mesh cover and the outer mesh cover are integrally formed or separately assembled and are embedded in the stepped structure formed by the front end of the inner cylinder (5) and the outer cylinder (6) of the air duct.

7. A dual-temperature hair dryer according to claim 1, characterized in that: It also includes an air intake filtration system, which is set at the air intake at the rear of the unit and consists of a metal filter (9) and a nylon filter (10) stacked together; the metal filter (9) is located on the outside and the nylon filter (10) is located on the inside, and the two together cover the air intake area of ​​the high-speed motor assembly (1).

8. A dual-temperature hair dryer according to claim 1, characterized in that: It also includes a button assembly (12), including a power button and a fan temperature switch button, both of which are electrically connected to the circuit control board assembly (2).

9. A dual-temperature hair dryer according to claim 1, characterized in that: The inner cylinder (5) and outer cylinder (6) of the air duct are both made of polyphenylene sulfide or liquid crystal polymer, and the heat distortion temperature is not lower than 260℃; the surface roughness Ra of the inner wall of the inner cylinder (5) is ≤0.8μm; the inner wall of the outer cylinder (6) is provided with several axial reinforcing ribs.

10. A dual-temperature hair dryer intelligent control system, applied to a dual-temperature hair dryer according to any one of claims 1 to 9, characterized in that: The intelligent control system is located on the control board assembly (2) and executes according to the button signals: If the power button is pressed for more than 1 second, the high-speed motor assembly (1) is started and the main airflow temperature is set to 90-100℃ by default. Check if the air temperature switch button is pressed. If so, switch to the mode where the main airflow temperature is 70-80℃. Check again whether the air temperature switch button is pressed. If so, switch to the mode where the main airflow temperature is the ambient temperature. In the mode where the main airflow temperature is 90-100℃ or 70-80℃, the control program adjusts the power supply of the heating frame assembly (3) through the PWM signal to stabilize the main airflow temperature within the set range.

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