A hand-held appliance having dual air flow paths

Abstract

This invention discloses a handheld device with dual airflow paths, comprising a main body having an air inlet and an air outlet, and an air inlet area formed within the main body; the main body contains a first airflow path and a second airflow path from the air inlet area to the air outlet, with a high-speed motor and a heating unit both arranged in the first airflow path; the first airflow path has a first air inlet and a first air outlet, and the second airflow path has a second air inlet and a second air outlet, the second air inlet at least partially surrounding the first air inlet, and the second air outlet adjacent to the first air outlet; and, when the high-speed motor is running, negative pressure is formed at the second air inlet and the second air outlet respectively, and the airflow in the air inlet area is drawn into the second airflow path to form a second fluid. This technical solution can effectively increase the total airflow without increasing the motor power, and the motor can operate at a lower speed for the same total airflow, effectively reducing noise intensity.

Description

Technical Field

[0001] This invention relates to the field of handheld hair care devices, and more particularly to a handheld device with dual airflow paths. Background Technology

[0002] Current high-speed hair dryers generally adopt a single airflow path architecture: "air intake at the bottom of the handle—high-speed brushless motor pressurization—main air duct—heating unit—air outlet." The motor speed is typically ≥90,000 rpm. Practice shows that the ratio of the area of ​​the air intake mesh at the bottom of the handle to the air intake area of ​​the high-speed motor is generally above 3:1, with a large redundancy in the air intake area. Even if half of the air intake mesh area is blocked, it does not affect the air volume entering through the high-speed motor.

[0003] The architecture has long suffered from the following pain points: the air speed and air volume are limited by the single airflow path and motor power, resulting in a bottleneck in drying efficiency; if the air speed and air volume are increased by increasing the motor speed or power, it will lead to excessive noise, and the air speed, air volume and noise are mutually restrictive and difficult to balance; the temperature of the casing rises (the blower is hot to the touch), and the temperature field of the air outlet is uneven (local hot spots); the motor and electronic control rely solely on their own intake air cooling; the kinetic energy of the air jet at the outlet is dissipated and wasted outside the machine; the heat dissipation of the air duct wall is directly lost and exacerbates the temperature rise of the casing.

[0004] The solution represented by Dyson's patent CN103355928B employs a dual-inlet, separate dual-airflow path architecture: the two airflow paths each have independent, spatially separated inlets. The main airflow enters from the inlet at the bottom of the handle, passes through the fan unit and heater, and exits from the annular second fluid outlet; the second airflow (entrained ambient air) enters from the central inlet at the rear of the air duct, passes through the main body, and combines with the main airflow at or near the outlet. The two airflows are emitted independently, achieving airflow amplification. In this solution, the main hot air outlet is located outside the passive airflow outlet, i.e., a "hot-encased-cold" outlet topology.

[0005] The following limitations exist in this type of solution: (1) A central channel (hollow air duct) must be formed through the body, which restricts the structure and appearance; (2) The two external air inlets are arranged separately, and the air intake and sealing structure is complicated; (3) The passive airflow path does not provide cooling for the motor, electrical control and the outer shell; (4) The outer shell anti-scalding relies on an additional heat insulation layer or air intake bypass, which increases weight and cost.

[0006] In summary, the existing technology has the following technical problems to be solved: (1) The dual air inlet separation architecture leads to complex structure and limited product form; (2) The passive airflow path fails to utilize the redundant air inlet area and the negative pressure potential of the motor; (3) The requirements for shell anti-scalding, air outlet softening, motor heat dissipation, and air volume gain are not solved by the same structure; (4) The kinetic energy of the air outlet jet and the heat dissipation of the main air duct wall are both wasted; (5) The wind speed and air volume are difficult to increase due to the limitation of motor power and single path, and increasing the motor speed leads to excessive noise. The wind speed, air volume and noise are mutually restrictive, and users cannot obtain a high air volume, fast drying and low noise user experience at the same time. Summary of the Invention

[0007] In view of the above-mentioned problems in the prior art, a handheld device with dual airflow paths is provided, which is designed to form a mixed airflow of cold air and hot air to achieve a hair care effect, and can effectively increase the total air volume without increasing the motor power. Under the same total air volume, the motor can operate at a lower speed, which can effectively reduce the noise source intensity, thereby overcoming at least one of the above-mentioned technical defects.

[0008] The specific technical solution is as follows: A handheld device with dual airflow paths includes a main body having an air inlet and an air outlet, an air inlet area formed within the main body and adjacent to the air inlet, and a high-speed motor and a heating unit also provided within the main body. The main body has a first airflow path and a second airflow path from the air inlet area to the air outlet. The high-speed motor and the heating unit are both arranged in the first airflow path. The first airflow path has a first air inlet and a first air outlet, and the second airflow path has a second air inlet and a second air outlet, wherein the second air inlet at least partially surrounds the first air inlet, and the second air outlet is adjacent to the first air outlet. Furthermore, when the high-speed motor is running, the first fluid flowing at high speed in the first airflow path forms negative pressure at the second air inlet and the second air outlet, respectively, causing the airflow in the air inlet area to be attracted into the second airflow path and form the second fluid. The first fluid and the second fluid are ejected from the air outlet independently or mixed and ejected from the air outlet.

[0009] Preferably, the main body includes an outer shell and an inner shell located within the outer shell, and a first airflow path is formed in the inner shell. The high-speed motor and the heating unit are both arranged in the inner shell, and a second airflow path is formed by the interlayer space formed by the outer shell and the inner shell, such that in the extended path, the second airflow path at least partially surrounds the first airflow path, and enables the second fluid to absorb the heat generated in the first airflow path and conducted to the wall of the inner shell.

[0010] Preferably, the second airflow path and the first airflow path are isolated from each other in the direction of extension.

[0011] Preferably, the second air inlet is at least a quarter of a circular ring; and when it is a complete closed ring, it completely surrounds the first air inlet.

[0012] Preferably, the first air outlet and the second air outlet have one of the following correspondences: The second air outlet is at least a quarter of a circle; and when it is a complete closed circle, it completely surrounds the first air outlet.

[0013] The first air outlet is at least a quarter of a circular ring; and when it is a complete closed ring, it completely surrounds the second air outlet.

[0014] Preferably, the second air inlet is a plurality of air inlets arranged around the first air inlet, and the second air outlet is a plurality of air outlets surrounding or being surrounded by the first air outlet.

[0015] Preferably, in the inner housing, the high-speed motor is arranged near the first air inlet, and the heating unit is arranged near the first air outlet.

[0016] Preferably, the end of the inner housing adjacent to the air outlet has one of the following structures: The end of the inner shell extends to or protrudes from the plane where the air outlet is located, causing the first fluid and the second fluid to mix on the outside of the air outlet. The end of the inner shell extends to the plane adjacent to the air outlet, and a mixing zone is formed at the position from the end of the inner shell to the plane of the air outlet, causing the first fluid and the second fluid to mix in the mixing zone and be sprayed out of the air outlet together. The end of the inner shell is far from the plane where the air outlet is located, causing the second fluid and the first fluid to mix at the first air outlet and be sprayed out together at the air outlet.

[0017] Preferably, the handheld device is a hair dryer with an overall "T" shape, featuring a horizontal nozzle and a vertical handle, with the nozzle and handle having one of the following correspondences: The lower end of the handle forms an air inlet, the front end of the air duct forms an air outlet, and the lower end of the handle forms an air inlet area that connects to the air inlet. The first airflow path and the second airflow path both extend from the front end of the air duct to the air inlet area inside the handle. The front end of the air duct forms an air outlet, while the rear end forms an air inlet. An air inlet area is formed inside the air duct near the rear end, connecting to the air inlet. Both the first airflow path and the second airflow path extend from the front end of the air duct to the air inlet area inside the air duct.

[0018] Preferably, an adjustable damper is also provided in the second airflow path to adjust the airflow rate of the second airflow path.

[0019] The beneficial effects of the above technical solution are as follows: (1) A handheld device with dual airflow paths includes a main body with an air inlet and an air outlet. The main body contains an air inlet area, a high-speed motor, and a heating unit. The main body forms a first airflow path and a second airflow path, which respectively form an air inlet and an air outlet. The high-speed motor and the heating unit are both arranged in the first airflow path. The second air inlet at least partially surrounds the first air inlet, and the second air outlet is adjacent to the first air outlet. Under the action of the high-speed motor, negative pressure is formed at the second air inlet and the second air outlet, causing airflow to flow into the second airflow path to form a second fluid. The air can be combined or sprayed independently at the air outlet to form a mixed airflow of cold air and hot air to achieve a hair care effect. Since the second fluid is formed by the negative pressure generated by the high-speed motor, the total air volume can be effectively increased without increasing the motor power. Under the same total air volume, the motor can operate at a lower speed, which can effectively reduce the noise source intensity. The mixing of the two airflows at the air outlet reduces the jet shear noise. In the premixed state, the airflow turbulence is reduced and the subjective hearing of wind noise is improved. There is no need for a hollow air duct and a second external air inlet. The overall appearance is clearly distinguished from the dual air inlet separate architecture, which allows for greater freedom in structure and appearance.

[0020] (2) The first airflow path is formed in the inner shell, and the high-speed motor and heating unit are arranged in the inner shell. The second airflow path is formed by the interlayer space formed by the outer shell and the inner shell. The first fluid continuously washes the inner wall of the outer shell and the outer wall of the inner shell, which can reduce the surface temperature of the outer shell of the main body by 10-20°C, significantly improve the safety of holding and touching the skin, and play a role in preventing the shell from getting scalded. The second airflow path formed by the interlayer space between the outer shell and the inner shell constitutes an acoustic quality layer for the first airflow path, which can block the motor noise and effectively suppress the noise. At the same time, the heat generated by the first fluid from the wall of the inner shell to the outside is captured by the second fluid and carried back to the air outlet, which can reduce heat loss, improve energy efficiency, play a role in heat recovery technology, and have an auxiliary heat dissipation effect on the high-speed motor, which can reduce the temperature rise of the electronic control.

[0021] (3) The second air outlet at least partially surrounds the first air outlet to form a ring-shaped low-temperature air curtain at the air outlet to wrap the mixed airflow of the hot air core, so as to make the air outlet temperature field uniform, eliminate local hot spots, and make the wind feel soft, effectively protect the hair. The air outlet wind speed profile is wider, and the drying efficiency is effectively improved. The total air outlet volume is expected to increase by 10% to 35%. Attached Figure Description

[0022] Figure 1 This is a perspective sectional view of a first embodiment of the handheld device with dual airflow paths of the present invention.

[0023] Figure 2 This is a side sectional view of a first embodiment of the handheld device with dual airflow paths of the present invention.

[0024] Figure 3This is a side sectional view of a second embodiment of the handheld device with dual airflow paths of the present invention.

[0025] Figure 4 This is a side sectional view of a third embodiment of the handheld device with dual airflow paths of the present invention.

[0026] Figure 5 This is a side sectional view of Embodiment 4 of the handheld device with dual airflow paths of the present invention.

[0027] Figure 6 This is a side sectional view of Embodiment 5 of the handheld device with dual airflow paths of the present invention.

[0028] Figure 7 This is a side sectional view of Embodiment Six of the handheld device with dual airflow paths of the present invention.

[0029] Figure 8 This is a side sectional view of Embodiment 7 of the handheld device with dual airflow paths of the present invention.

[0030] Figure 9 This is a side sectional view of an eighth embodiment of the handheld device with dual airflow paths of the present invention.

[0031] Figure 10 This is a side sectional view of Embodiment 9 of the handheld device with dual airflow paths of the present invention. Detailed Implementation

[0032] To make the technical means, creative features, achieved objectives, and effects of this invention easily understood, the following embodiments, in conjunction with the accompanying drawings, provide a detailed description of the invention. Definitions are as follows: Figure 2 The left-to-right direction shown on the paper is the front-to-back direction in this embodiment, and the top-to-bottom direction shown on the paper is the top-to-bottom direction in this embodiment. Furthermore, the green arrows in the accompanying drawings indicate the direction of the first airflow path, the yellow arrows indicate the direction of the second airflow path, and the red arrows indicate the direction of airflow inflow and outflow from the main body.

[0033] Example 1, See Figure 1 and Figure 2 As shown in the figure, the handheld device with dual airflow paths provided in this embodiment includes a main body 1, an air inlet end 6 and an air outlet end 7 formed at both ends of the main body 1, and an air inlet area 14 formed within the main body 1 and adjacent to the air inlet end 6. A high-speed motor 4 and a heating unit 5 are also provided within the main body 1. External airflow enters the air inlet area 14 through the air inlet end 6; wherein, The main body 1 has a first airflow path 2 from the air inlet area 14 to the air outlet 7. The high-speed motor 4 and the heating unit 5 are both arranged in the first airflow path 2. The high-speed motor 4 is used to transport the airflow from the air inlet area 14 to the air outlet 7 for ejection. The first airflow path 2 has a first air inlet 8 adjacent to the air inlet area 14 and a first air outlet 9 adjacent to the air outlet 7. The main body 1 also forms a second airflow path 3 from the air inlet area 14 to the air outlet 7. The second airflow path 3 has a second air inlet 10 adjacent to the air inlet area 14 and a second air outlet 11 adjacent to the air outlet 7. The second air inlet 10 at least partially surrounds the first air inlet 8, and the second air outlet 11 is adjacent to the first air outlet 9. Furthermore, under the negative pressure of the high-speed motor 4, the first fluid flowing at high speed in the first airflow path 2 forms negative pressure at the second air inlet 10 and the second air outlet 11, respectively, causing the airflow in the air inlet area 14 to be attracted into the second airflow path 3 and form the second fluid. The first fluid and the second fluid are ejected from the air outlet 7 independently or mixed and ejected from the air outlet 7.

[0034] Based on the above technical solution, the handheld device with dual airflow paths includes a main body 1 with an air inlet 6 and an air outlet 7. The main body 1 contains an air inlet area 14, a high-speed motor 4, and a heating unit 5. The main body 1 forms a first airflow path 2 and a second airflow path 3, respectively forming an air inlet and an air outlet. The high-speed motor 4 and the heating unit 5 are both arranged in the first airflow path 2. The second air inlet 10 at least partially surrounds the first air inlet 8, and the second air outlet 11 is adjacent to the first air outlet 9. The high-speed motor 4, on the one hand, forms a first fluid in the first airflow path 2, and on the other hand, creates negative pressure at the second air inlet 10 and the second air outlet 11 respectively, causing airflow to flow into the second airflow path 3 to form a second fluid. The two fluids... The air outlet 7 can be sprayed out in combination or independently. The heating unit 5 heats the first fluid to form hot air, while the second fluid, which is not heated by the heating unit 5, forms cold air. When sprayed out together, they can form a mixed airflow of cold air surrounding hot air (at least partially surrounding it) to achieve a hair care effect. Since the second fluid is formed by the negative pressure generated by the high-speed motor 4, the total air volume can be effectively increased without increasing the motor power. Under the same total air volume, the motor can operate at a lower speed, which can effectively reduce the noise source intensity. The mixing of the two airflows at the air outlet 7 reduces the jet shear noise. In the premixed state, the airflow turbulence is reduced and the subjective hearing of wind noise is improved. There is no need for a hollow air duct and a second external air inlet. The overall appearance is clearly distinguished from the dual air inlet separate architecture, which makes the structure and appearance more flexible.

[0035] In a preferred embodiment, the main body 1 includes an outer shell 12 and an inner shell 13 located in the outer shell 12. A first airflow path 2 is formed in the inner shell 13. A high-speed motor 4 and a heating unit 5 are both arranged in the inner shell 13. A second airflow path 3 is formed by the interlayer space formed by the outer shell 12 and the inner shell 13, such that the second airflow path 3 at least partially surrounds the first airflow path 2 in the extended path, and enables the second fluid to absorb the heat generated in the first airflow path 2 and conducted to the wall of the inner shell 13.

[0036] The heat is mainly generated by the heating of the first fluid by the heating unit 5 and the high-speed operation of the high-speed motor 4. The low-temperature or room-temperature second fluid continuously washes the inner wall of the outer shell 12 and the outer wall of the inner shell 13, which can reduce the surface temperature of the outer shell 12 of the main body 1 by 10-20°C, significantly improving the safety of gripping and touching the skin, and can play a role in preventing the shell from getting scalded. In addition, the second airflow path 3 formed by the interlayer space between the outer shell 12 and the inner shell 13 constitutes an acoustic quality layer for the first airflow path 2, which can block motor noise and effectively suppress noise. At the same time, the heat dissipation generated by the first fluid from the wall of the inner shell 13 is captured by the second fluid and carried back to the air outlet 7, which can reduce heat loss, improve energy efficiency, play a role in heat recovery technology, and have an auxiliary heat dissipation effect on the high-speed motor 4, which can reduce the temperature rise of the electronic control.

[0037] As a further preferred embodiment, the second airflow path 3 and the first airflow path 2 are isolated in the extending direction, which can prevent heat in the first airflow path 2 from directly entering the second airflow path 3. The second fluid and the first fluid combine at or near the air outlet 7 and are jointly ejected from the air outlet 7. As a further preferred embodiment, the second air outlet 11 at least partially surrounds the first air outlet 9 to form a mixed airflow that wraps the hot air core in an annular low-temperature air curtain at the air outlet 7, thereby making the air outlet temperature field uniform, eliminating local hot spots, and providing a gentle breeze that effectively protects the hair. In addition, the air outlet velocity profile is wider, effectively improving the hair drying efficiency, and the total air volume is expected to increase by 5% to 35%.

[0038] In a preferred embodiment, the second air inlet 10 is at least a quarter-circular ring or an equivalent configuration; and when it is a fully closed ring or an equivalent configuration, it completely surrounds the first air inlet 8.

[0039] As a further preferred embodiment, the first air outlet 9 and the second air outlet 11 have one of the following correspondences: The second air outlet 11 is at least a quarter-circle or equivalent configuration; and when it is a complete closed circle or equivalent configuration, it completely surrounds the first air outlet 9.

[0040] The first air outlet 9 is at least a quarter-circle or equivalent configuration; and when it is a complete closed circle or equivalent configuration, it completely surrounds the second air outlet 11.

[0041] That is, the air inlet of the second airflow path 3 surrounds at least a part of the air inlet of the first airflow path 2 in order to form a negative pressure. The first air outlet 9 and the second air outlet 11 can be configured to surround or be surrounded, and can jointly eject air from the air outlet 7 to form a mixed airflow of cold surrounding hot or hot surrounding cold.

[0042] As an alternative, the second air inlet 10 is a plurality of air inlets arranged around the first air inlet 8, and the second air outlet 11 is a plurality of air outlets surrounding or being surrounded by the first air outlet 9.

[0043] As a further preferred embodiment, in the inner housing 13, the high-speed motor 4 is arranged near the first air inlet 8, and the heating unit 5 is arranged near the first air outlet 9. This enhances the negative pressure generated at the second air inlet 10 and reduces heat loss after the heating unit 5 heats the first fluid. It is worth noting that the main body 1 also includes a PCB circuit board, with the high-speed motor 4 and heating unit 5 electrically connected to the PCB circuit board for conduction and control. The outer housing also has a control panel electrically connected to the PCB circuit board; however, this is not a major innovation of the present invention and will not be described in detail here.

[0044] As a further preferred embodiment, the end of the inner housing 13 adjacent to the air outlet 7 has one of the following structures: The end of the inner shell 13 extends to or protrudes from the plane of the air outlet 7, causing the first fluid and the second fluid to mix outside the air outlet 7. The end of the inner shell 13 extends to the plane adjacent to the air outlet 7, and a mixing region 15 is formed at the position from the end of the inner shell 13 to the plane of the air outlet 7, so that the first fluid and the second fluid mix in the mixing region 15 and are sprayed out of the air outlet 7 together. The end of the inner shell 13 is far from the plane where the air outlet 7 is located, causing the second fluid and the first fluid to mix at the first air outlet 9 and be sprayed out of the air outlet 7 together.

[0045] Specifically, it can be combined with Figures 2 to 4 As shown, the front air outlet plane of the main body 1 serves as the air outlet 7. This air outlet is divided into a first air outlet 9 and a second air outlet 11 within the main body 1 by the inner shell 13. In the first case described above, as... Figure 2 As shown, the end of the inner casing 13 extends to the plane of the air outlet 7, so that the first fluid and the second fluid will only come into contact and mix after being ejected from the air outlet 7. In the second case described above, as... Figure 3As shown, the end of the inner shell 13 does not extend to the first air outlet 9 and the second air outlet 11, creating a mixing region 15 within the main body 1. This allows the first fluid and the second fluid to mix within the main body 1 near the air outlet 7 before being ejected from the air outlet 7. In the third scenario described above, the end of the inner shell 13 is further removed from the plane of the air outlet 7. The second fluid, after flowing out of the second air outlet 11, comes into contact with the first fluid, forming a mixture that is then ejected from the air outlet 7. Various air mixing methods can create different forms of mixed airflow. Different designs can be selected based on requirements; different guiding airflow and mixing effects can be achieved simply by adjusting the end structure of the inner shell 13.

[0046] In a preferred embodiment, the handheld device is a hair dryer with an overall "T" shape or similar form, and has a horizontal nozzle 15 and a vertical handle 16, wherein the nozzle 15 and the handle 16 have one of the following correspondences: The lower end of the handle 16 forms an air inlet 6, the front end of the air duct 15 forms an air outlet 7, and the lower end of the handle 16 forms an air inlet area 14 that connects to the air inlet 6. The first airflow path 2 and the second airflow path 3 both extend from the front end of the air duct 15 to the air inlet area 14 inside the handle 16. The front end of the air duct 15 forms an air outlet 7, and the rear end forms an air inlet 6. An air inlet area 14 is formed in the air duct 15 near the rear end, which is connected to the air inlet 6. The first airflow path 2 and the second airflow path 3 both extend from the front end of the air duct 15 to the air inlet area 14 in the air duct 15.

[0047] The air inlet 6 can be designed at the lower end of the handle 16 or at the rear end of the air duct 15. Alternatively, in the first case, the air inlet 6 can be formed in the lower opening or the opening on the side wall of the handle 16. In the second case, the rear end of the air duct 15 can be designed as a hollow structure or as a cover plate (or air inlet hood) with openings, or the air inlet 6 can be designed in an annular air inlet structure around the cover plate, or the air inlet 6 can be designed on the side wall of the air duct 15. It is not limited to these.

[0048] As a further preferred embodiment, such as Figure 2 As shown in the illustration, in this embodiment, the lower end of the handle 16 forms an air inlet 6, the front end of the air duct 15 forms an air outlet 7, the second air outlet 11 is arranged around the first air outlet 9, and the end of the inner shell 13 extends to the air outlet 7. Furthermore, the air inlet 6 is also provided with a filter screen.

[0049] Specifically, the entire unit has only one air intake area 14 for external air to enter (the air intake mesh at the bottom of the handle 16, or the air intake cover at the rear of the unit in a rear air intake scheme). The first airflow and the second airflow both originate from the same air intake outer surface, and the air intake mesh does not require geometric partitioning. A filter is installed at the air intake end 6, and the second air intake 10 is located downstream of the filter, preventing hair and dust from entering the second airflow path 3. The second fluid travels upward along the outer channel of the handle 16 (second airflow path 3), enters the outer shell interlayer channel of the air duct 15 through the sealed connection structure of the connection between the handle 16 and the air duct 15, and extends along the outer periphery of the first airflow path 2 to the air outlet end 7, completely sealed and isolated from the first airflow path 2, forming an anti-scalding jacket for the outer shell.

[0050] Furthermore, the second air inlet 10 is located in the airflow field surrounding the high-speed motor 4. The second air inlet 10 is formed around the outer periphery of the high-speed motor 4, and can be an annular or semi-annular slit surrounding the outer wall of the motor, or multiple openings distributed around the outer periphery of the motor, situated within the converging flow field leading to the motor inlet in the air intake area 14. The incoming airflow converges and accelerates along the outer wall of the motor (air duct). The second air inlet 10 can be positioned to capture the incoming flow pressure, while the negative pressure field created by the motor's suction promotes the airflow into the second airflow path 3. The cross-sectional area of ​​the second air inlet 10 is 1 / 4 to 1 / 1 of the cross-sectional area of ​​the first air inlet 8 (motor air intake channel), preferably about 1 / 3 to 2 / 3. The two-way flow ratio can be adjusted by the surrounding angle, opening orientation, and area of ​​the second air inlet 10. Since the highest-velocity airflow in the convergence flows close to the outer wall of the motor, the second air inlet 10 scoops up precisely the low-temperature, high-speed airflow, serving as auxiliary cooling for the motor and electronic control system.

[0051] The flow paths of the first airflow and the second airflow are as follows: First airflow: After passing through the filter, it is pressurized by the high-speed motor 4, rises into the first airflow path 2, and is heated by the heating unit 5 (which can be a ring heater with mica skeleton wound with nickel-chromium wire, a heater with integral injection molded nickel-chromium wire profile, or a PTC heating element, etc.) and then ejected from the first air outlet 9. Second airflow: After entering the airflow, it converges along the outer wall of the motor. A portion of the airflow, under the action of the motor's negative pressure and the incoming flow pressure, enters the second airflow path 3 through the second air inlet 10 around the motor, flows along the outer periphery of the main airflow path to the second air outlet 11 and is ejected, mixing with the first fluid in the outer area of ​​the air outlet 7.

[0052] In addition, an adjustable damper is provided in the second airflow path to adjust the airflow rate of the second airflow path.

[0053] Example 2, See Figure 3As shown, the handheld device provided in this embodiment has the same technical features as the first embodiment described above. The only difference is that the end of the inner shell 13 extends to the plane adjacent to the air outlet 7 to form a mixing region 15. The airflow difference is that the two airflows converge in the inner side (edge) area of ​​the air outlet 7 and then are ejected.

[0054] Example 3, See Figure 4 As shown, the handheld device provided in this embodiment has the same technical features as the first embodiment described above. The only difference is that the end of the inner shell 13 extends to a position away from the plane where the air outlet 7 is located, and the first fluid and the second fluid are mixed at the first air outlet 9.

[0055] The difference in airflow is that the second airflow is turned into the first airflow path 2 inside the outlet 7. The two airflows are premixed into a single mixed flow inside the machine body before being emitted through the outlet 7. In this configuration, the two airflows are no longer emitted independently.

[0056] Example 4, See Figure 5 As shown, the handheld device provided in this embodiment has the same technical features as the first embodiment described above. The only difference is that the inner shell 13 is used to construct the first air outlet 9 around the second air outlet 11, and the end of the inner shell 13 extends to the air outlet 7.

[0057] Specifically, the air intake and motor peripheral flow distribution structure of handle 16 is the same as in Embodiment 1; after the second fluid enters the machine, it flows around the channel formed by the inner shell 13 and the machine structure to the bottom of the central blind hole 17 (a non-through hole with an open front end and a closed rear end), flows forward along the inner surface (guide surface) of the blind hole, and flows out from the front opening of the blind hole 17, mixing with the first fluid in the front end of the air outlet 7 and the outer region of the inner ring. The second fluid cools the wall of the blind hole and the inner wall of the first airflow path 2 along its path, and forms a low-temperature airflow in the central region of the air outlet 7.

[0058] Example 5, See Figure 6 As shown, the handheld device provided in this embodiment has essentially the same technical features as that in Embodiment 1 above. The only difference is that the inner shell 13 constructs the first air outlet 9 to surround the second air outlet 11, and the first air outlet 9 is annular or equivalent in shape while the second air outlet 11 is hollow cylindrical. The end of the inner shell 13 extends to the plane adjacent to the air outlet 7 to form a mixing region 15. Its airflow path is the same as in Embodiment 4, but the mixing position is located in the inner ring region adjacent to the air outlet 7.

[0059] Example 6, See Figure 7As shown, the handheld device provided in this embodiment has the same technical features as that in Embodiment 1 above. The only difference is that the inner shell 13 constructs the first air outlet 9 to surround the second air outlet 11, and both the first air outlet 9 and the second air outlet 11 are annular or equivalent in shape. The end of the inner shell 13 extends to the plane adjacent to the air outlet 7 to form a mixing region 15. Its airflow path is the same as that in Embodiment 4, but the second airflow path 3 runs radially inside the first airflow path 2 (extending along the inner wall of the first airflow path 2). The second air outlet 11 is located inside the front end of the air outlet 7. The two airflows mix in the area adjacent to the front end of the air outlet 7. This configuration directly cools the inner wall of the first airflow path 2 and the inner side of the heating unit 5.

[0060] Example 7, See Figure 8 As shown, the handheld device provided in this embodiment has the same technical features as the first embodiment described above. The only difference is that the front end of the air duct 15 forms an air outlet 7, while the rear end forms an air inlet 6, and the end of the inner shell 13 extends to the plane where the air outlet 7 is located.

[0061] Specifically, the high-speed motor 4 is placed inside the air duct 15, the air inlet 6 is located at the rear air inlet cover of the air duct 15 (the only air inlet surface of the entire machine), and the handle 16 is a grip that does not allow airflow. First airflow: Air enters from the rear, is pressurized by the motor, and then flows forward into the first airflow path 2. After being heated by the heating unit 5, it is ejected from the first air outlet 9. Second airflow: After entering from the rear, air is diverted around the motor and enters the negative pressure boosting second airflow path 3. It flows along the outer shell of the machine to the air outlet 7, where it mixes with the first airflow in the outer area of ​​the air outlet 7.

[0062] Example 8, See Figure 9 As shown, the handheld device provided in this embodiment has the same technical features as that in Embodiment 1 above. The only difference is that the front end of the air duct 15 forms an air outlet 7, and the rear end forms an air inlet 6. The end of the inner shell 13 extends to a position adjacent to the plane where the air outlet 7 is located, so as to form a mixing region 15. Its airflow path is the same as that in Embodiment 7, but the mixing position is located in the inner ring region adjacent to the air outlet 7.

[0063] Example 9, See Figure 10As shown, the handheld device provided in this embodiment has the same technical features as that in Embodiment 1 above. The only difference is that the front end of the air duct 15 forms an air outlet 7, and the rear end forms an air inlet 6. The end of the inner shell 13 extends to a position away from the plane where the air outlet 7 is located. The first fluid and the second fluid mix at the first air outlet 9. Its airflow path is the same as that in Embodiment 7, but the second fluid is turned into the first airflow path 2 inside the main body 1. The two airflows are premixed inside the main body 1 and then emitted as a single mixed stream.

[0064] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A handheld device with dual airflow paths, comprising a main body (1) having an air inlet (6) and an air outlet (7), an air inlet area (14) formed within the main body (1) and adjacent to the air inlet (6), wherein a high-speed motor (4) and a heating unit (5) are further disposed within the main body (1); characterized in that, The main body (1) has a first airflow path (2) and a second airflow path (3) from the air inlet area (14) to the air outlet (7), and the high-speed motor (4) and the heating unit (5) are both arranged in the first airflow path (2); The first airflow path (2) has a first air inlet (8) and a first air outlet (9), the second airflow path (3) has a second air inlet (10) and a second air outlet (11), and the second air inlet (10) at least partially surrounds the first air inlet (8), and the second air outlet (11) is adjacent to the first air outlet (9). Furthermore, when the high-speed motor (4) is running, the first fluid flowing at high speed in the first airflow path (2) forms negative pressure at the second air inlet (10) and the second air outlet (11), causing the airflow in the air inlet area (14) to be attracted into the second airflow path (3) and form the second fluid. The first fluid and the second fluid are ejected from the air outlet (7) independently or ejected from the air outlet (7) after mixing.

2. The handheld device with dual airflow paths as described in claim 1, characterized in that, The main body (1) includes an outer shell (12) and an inner shell (13) located in the outer shell (12). The first airflow path (2) is formed in the inner shell (13). The high-speed motor (4) and the heating unit (5) are both arranged in the inner shell (13). The second airflow path (3) is formed by the interlayer space formed by the outer shell (12) and the inner shell (13), such that in the extended path, the second airflow path (3) at least partially surrounds the first airflow path (2) and enables the second fluid to absorb the heat generated in the first airflow path (2) and conducted to the wall of the inner shell (13).

3. The handheld device with dual airflow paths as described in claim 2, characterized in that, The second airflow path (3) and the first airflow path (2) are isolated from each other in the extension direction.

4. The handheld device with dual airflow paths as described in claim 3, characterized in that, The second air inlet (10) is at least a quarter of a ring; and when it is a complete closed ring, it completely surrounds the first air inlet (8).

5. The handheld device with dual airflow paths as described in claim 4, characterized in that, The first air outlet (9) and the second air outlet (11) have one of the following correspondences: The second air outlet (11) is at least a quarter of a ring; and when it is a complete closed ring, it completely surrounds the first air outlet (9). The first air outlet (9) is at least a quarter of a ring; and when it is a complete closed ring, it completely surrounds the second air outlet (11).

6. The handheld device with dual airflow paths as described in claim 5, characterized in that, The second air inlet (10) is a plurality of air inlets arranged around the first air inlet (8), and the second air outlet (11) is a plurality of air outlets surrounding or being surrounded by the first air outlet (9).

7. The handheld device with dual airflow paths as described in claim 5, characterized in that, In the inner housing (13), the high-speed motor (4) is arranged near the first air inlet (8), and the heating unit (5) is arranged near the first air outlet (9).

8. The handheld device with dual airflow paths as described in claim 2, characterized in that, The end of the inner housing (13) adjacent to the air outlet (7) has one of the following structures: The end of the inner shell (13) extends to or protrudes from the plane of the air outlet (7), causing the first fluid and the second fluid to mix outside the air outlet (7); The end of the inner shell (13) extends to a position adjacent to the plane where the air outlet (7) is located, and a mixing region (15) is formed at the position from the end of the inner shell (13) to the plane where the air outlet (7) is located, so that the first fluid and the second fluid mix in the mixing region (15) and are sprayed out of the air outlet (7) together. The end of the inner shell (13) is far from the plane where the air outlet (7) is located, causing the second fluid and the first fluid to mix at the first air outlet (9) and spray out together from the air outlet (7).

9. The handheld device with dual airflow paths as described in claim 8, characterized in that, The handheld device is a hair dryer that is T-shaped in shape, and has a horizontal nozzle (15) and a vertical handle (16). The nozzle (15) and the handle (16) have one of the following correspondences: The lower end of the handle (16) forms the air inlet (6), the front end of the air duct (15) forms the air outlet (7), and the lower end of the handle (16) forms an air inlet area (14) that connects to the air inlet (6). The first airflow path (2) and the second airflow path (3) both extend from the front end of the air duct (15) to the air inlet area (14) inside the handle (16). The front end of the air duct (15) forms the air outlet (7), and the rear end forms the air inlet (6). An air inlet area (14) is formed in the air duct (15) near the rear end, which is connected to the air inlet (6). The first airflow path (2) and the second airflow path (3) both extend from the front end of the air duct (15) to the air inlet area (14) in the air duct (15).

10. The handheld device with dual airflow paths as described in claim 9, characterized in that, An adjustable damper is also provided in the second airflow path (3) to adjust the airflow of the second airflow path (3).

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