A handheld hair dryer

Abstract

The invention discloses a handheld electric hair dryer, wherein the hair dryer body comprises a body shell and a disc-shaped component, the body shell comprises an annular outer shell and an internal cylindrical component concentrically arranged with the annular outer shell, the annular outer shell comprises an open end of the shell and a rear end of the shell, the rear end of the shell is sealed and connected with the internal cylindrical component, the disc-shaped component is connected with the internal cylindrical component, an annular gap is formed between the outer circumferential wall surface of the disc-shaped component and the open end of the shell, an annular cavity is arranged between the annular outer shell and the internal cylindrical component, a heating unit is arranged in the annular cavity, an air inlet opening is arranged on the annular outer shell, the air inlet opening is connected with one end of a handle, the handle is a hollow structure, and a fan unit and a single-chip control unit are arranged in the hollow structure. The invention generates a Coanda effect at the wall surface of the annular gap-shaped air outlet, so that the air output of the hair dryer has a certain air amplification effect, which can effectively increase the air output and dry the hair more quickly.

Description

Technical Field

[0001] The invention relates to the field of hair dryers, and in particular to a handheld high-speed motor and fan blade driven electrically heated hot air hair dryer, such as a hair dryer and a hair dryer in the field of small household appliances. Background Art

[0002] Electric hair dryers are mainly used for drying and shaping hair. They can also be used for local drying, heating and treatment in laboratories, physiotherapy rooms, industrial production, and art.

[0003] Typically, a motor and a fan blade are provided, which draw air into the body, which is then blown out after being heated by a heating wire. Typically, such hair dryers are provided with an air collecting port or a diffusion nozzle, which can be connected to or removed from the hair dryer and changes the speed and direction of the air flow discharged from the hair dryer.

[0004] Dyson patent CN201621361236.9 discloses a handheld product using a high-speed motor. The motor speed in this technical solution is between 75,000 and 110,000 revolutions per minute. This handheld product allows the fan unit composed of a high-speed motor installed in the handle to drive air into the body cavity and blow it out quickly from a 2mm wide annular outlet. It uses air multiplication technology and the wind speed can reach 17m / s, which is unattainable by ordinary hair dryers. Although it is already a very high wind speed, the airflow direction of the handle will change by about 90° when it flows to the body cavity, which will cause losses in wind speed and wind pressure. In the prior art, wind guide structures are usually set to reduce this loss.

[0005] Another disadvantage of the bladeless high-speed hair dryer technology solution currently on the market is that the circuit board is placed at the rear end of the top of the hair dryer, where the air flow is not very smooth, and heat dissipation has always been a big problem.

[0006] Currently, the technical solutions for bladeless high-speed hair dryers on the market usually install a filter device at the air inlet end of the hair dryer. However, after long-term use, the filter device and the filter net are covered with dust, which is not easy to detect. Dust and other reasons often cause increased noise, unreasonable shutdown or overheating protection failure, which reduces the consumer experience.

[0007] Patent application number CN201710809640.0 discloses a handheld smooth hair dryer. The technical solution includes an air multiplier device, characterized in that: the air guide element is provided with at least one annular air outlet cutout, and the width of the annular air outlet cutout should be within 1.3 to 1.4 mm. This technical solution does not meet many elements of the Coanda effect, such as the absence of a wall-attached curved surface, and the lack of research and definition of various factors of the inlet channel and the air outlet channel. We have also made similar prototypes in research and development, and their performance is far inferior to our technical solution. Summary of the invention

[0008] The purpose of the present invention is to provide a novel electric hair dryer with a more reasonable structure, a higher and more stable wind speed, and a faster hair drying function.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a handheld electric hair dryer, comprising a hair dryer body and a handle, the hair dryer body comprising a body shell and a disc-shaped component, the body shell comprising an annular outer shell and an internal cylindrical component concentrically arranged with the annular outer shell, the annular outer shell comprising an open end of the shell and a rear end of the shell, the rear end of the shell is sealed and connected to the internal cylindrical component, the disc-shaped component is connected to the internal cylindrical component, an annular gap is formed between the outer circumferential wall surface of the disc-shaped component and the open end of the shell, an annular cavity is arranged between the annular outer shell and the internal cylindrical component, a heating unit is arranged in the annular cavity, an air inlet opening is arranged on the annular outer shell, the air inlet opening is connected to one end of the handle, the handle is a hollow structure, the hollow structure is an air inlet channel, a fan unit and a single-chip control unit are arranged in the hollow structure, and a filter device is arranged at the end of the handle away from the hair dryer body.

[0010] Preferably, the outer circumferential wall surface of the disc-shaped component constitutes the inner lead-out surface of the annular gap, and the inner wall surface of the annular outer shell forms an annular guide slope at the open end of the shell, and the annular guide slope constitutes the outer lead-out surface of the annular gap.

[0011] Preferably, the outer circumferential wall surface of the disc-shaped component includes an annular gap forming section wall surface and an annular gap lead-out section wall surface, the annular gap forming section wall surface constitutes the inner guide surface of the annular gap, and the annular gap lead-out section wall surface is connected to the annular gap forming section wall surface and forms an inner angle less than 180°.

[0012] Preferably, the width of the annular gap is 0.5 mm to 5 mm, and the angle between the center line of the annular gap and the center axis of the air inlet channel is not less than 90°.

[0013] Preferably, the wall surface of the annular gap forming section and the annular guide slope are staggered inside and outside to form the annular gap of the exhaust port.

[0014] Preferably, the angle between the central plane of the annular gap and the horizontal central axis of the hair dryer body is 5° to 55°.

[0015] Preferably, the wall surface of the annular gap forming section is an inclined surface or a curved surface, and the wall surface of the annular gap leading-out section is an inclined surface or a curved surface.

[0016] Preferably, one end of the internal cylindrical component protrudes from the open end of the shell and is provided with an external thread, and one end of the disc-shaped component is provided with an internal thread, the internal thread is meshed with the external thread, the disc-shaped component is connected to the main shell, and the size and shape of the annular gap are adjusted.

[0017] Preferably, the cross section of the main body shell passing through the center axis is E-shaped, and the cross section of the disc-shaped component passing through the center axis is also E-shaped.

[0018] Preferably, a supporting structure is arranged in the annular cavity, a heating unit is arranged inside the supporting structure, a single chip control unit is placed in one end of the handle close to the filtering device, the filtering device includes an outer cylindrical coarse filtering device and an inner stainless steel filtering device, and the power system of the fan unit is a forward and reverse frequency conversion motor.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The main air entering the handle passes through the inlet of the filter device, is driven by the fan unit, and is sent to the annular cavity, and is ejected at high speed by the annular slit-shaped exhaust port. The air from the outside of the tail of the hair dryer body is sucked by the fast airflow discharged from the annular slit-shaped exhaust port through the air outlet channel, generating a Coanda effect. The ejected air flow and the sucked air flow constitute the total air flow ejected forward from the lead-out inclined surface formed by the hair dryer body. That is, the Coanda effect is generated at the wall surface of the annular slit-shaped exhaust port, so that the air output of the hair dryer has a certain air amplification effect, which can effectively increase the air output. Among them, the setting of the annular slit-shaped exhaust port has an amplifying effect on the airflow. When the air flows out from the annular slit-shaped exhaust port, according to the Coanda effect, this part of the air (called the first airflow) will be adsorbed on the wall surface of the air outlet guide component and flow along the wall surface, so that a certain negative pressure is generated in the central area of ​​the annular inner wall curved surface, so that a large amount of surrounding air is sucked in, and the first airflow and the surrounding airflow merge to form a fast and high-capacity airflow outflow, realizing the air amplification effect. In addition, the air from the handle of the present invention flows in a direct current direction toward the annular cavity of the hair dryer body, which reduces the loss of wind speed and wind pressure, thereby making the wind speed greater and more stable, and drying the hair faster. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a handheld hair dryer according to Embodiment 1 of the present invention;

[0022] Figure 2 for Figure 1 Rear view of

[0023] Figure 3 for Figure 1 Side view of

[0024] Figure 4 for Figure 1 Section view along AA direction;

[0025] Figure 5 for Figure 4 A partial enlarged schematic diagram of point B in the middle;

[0026] Figure 6 for Figure 1 Explosion diagram of

[0027] In the figure: 1. hair dryer body, 11. body shell, 111. annular outer shell, 1111. shell open end, 1112. shell tail end, 1113. air inlet opening, 112. internal cylindrical component, 12. disc-shaped component, 121. annular gap forming section wall, 122. annular gap leading out section wall, 13. annular cavity, 131. supporting structure, 14. annular gap, 2. handle, 21. air inlet channel, 22. control on / off, 3. heating unit, 4. fan unit, 41. motor, 42. fan blades, 5. single chip control unit, 6. filtering device, 61. outer layer cylindrical coarse filtering device, 62. inner layer stainless steel filtering device, 7. honeycomb component. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 6As shown, a handheld electric hair dryer includes a hair dryer body 1 and a handle 2, the handle 2 is a circular tube, the hair dryer body 1 includes a body shell 11 and a disc-shaped component 12, the body shell 11 is in a similar E-shape, including an annular outer shell 111 and an inner cylindrical component 112 arranged concentrically with the annular outer shell 111, the annular outer shell 111 has a circular tube portion and an arc portion, the circular tube portion and the arc portion together constitute the annular outer shell 111, the annular outer shell 111 includes a shell open end 1111 and a shell tail end 1112, the shell tail end 1112 is a circular arc portion, and is sealed and connected to the inner cylindrical component 112. The outer wall diameter of the circular tube portion of the annular outer shell 111 is about 82 mm. The disc-shaped component 12 is also E-shaped and connected to the internal cylindrical component 112. An annular gap 14 is formed between the outer circumferential wall of the disc-shaped component 12 and the open end 1111 of the shell. An annular cavity 13 is arranged between the annular outer shell 111 and the internal cylindrical component 112. The average thickness of the cavity wall of the annular cavity 13 is usually between 1mm and 5mm, preferably between 1mm and 3mm, which is conducive to reducing the resistance of air flow and reducing the loss of air flow. A heating unit 3 is arranged in the annular cavity 13, and an exhaust port is arranged in the annular cavity 13. The exhaust port is an annular gap 14, which is used to guide the circulating air in the annular cavity 13 to the outlet. The width of the annular gap 14 is 0.5mm to 5mm, preferably between 1.5mm and 2.6mm. An air inlet opening 1113 is provided on the annular outer shell 111, and the air inlet opening 1113 is connected to one end of the handle 2. The handle 2 is a hollow structure, and the hollow structure is an air inlet channel 21. The angle between the annular gap 14 and the central axis of the air inlet channel 21 is not less than 90°. A fan unit 4 and a single-chip control unit 5 are provided in the hollow structure, and a filter device 6 is provided at one end of the handle 2 away from the hair dryer body 1.

[0030] In other preferred embodiments, the outer circumferential wall surface of the disc-shaped component 12 constitutes the inner lead-out surface of the annular gap 14, and the inner wall surface of the annular outer shell 111 forms an annular guide slope at the shell open end 1111, and the annular guide slope constitutes the outer lead-out surface of the annular gap 14. The outer circumferential wall surface of the disc-shaped component 12 includes an annular gap forming segment wall surface 121 and an annular gap lead-out segment wall surface 122, and the annular gap forming segment wall surface 121 constitutes the inner guide surface of the annular gap 14. The annular gap forming segment wall surface 121 and the annular guide slope are staggered inside and outside to form the annular gap 14 of the exhaust port. The angle between the center plane of the annular gap 14 and the horizontal center axis of the hair dryer body 1 is 5° to 55°. The annular gap outlet section wall 122 is connected to the annular gap forming section wall 121 and forms an inner angle of 135°, so that the annular gap outlet section wall 122 forms a trumpet-shaped structure for gathering wind, with the large opening facing the direction of the annular gap 14 and the small opening away from the direction of the annular gap 14, thereby improving the wind gathering effect. The annular gap forming section wall 121 is an inclined surface, and the annular gap outlet section wall 122 is a curved surface. One end of the internal cylindrical component 112 protrudes from the open end 1111 of the shell and is provided with an external thread, and one end of the disc-shaped component 12 is provided with an internal thread, which meshes with the external thread to connect the disc-shaped component 12 and the main body shell 11, and adjust the size and shape of the annular gap 14. Of course, other connection methods are also possible.

[0031] The outer shell of the disc-shaped component 12, the outer shell of the main body shell 11 and / or the outer shell of the handle 2 are made of plastic material and sprayed with rubber paint, which not only improves the overall appearance of the hair dryer, but also improves the overall texture of the hair dryer and enhances the user experience.

[0032] A heating unit 3 is disposed inside the annular cavity 13 , and the heating unit 3 is used to heat the air flow in the annular cavity 13 and transport the air flow to the front end of the hair dryer body 1 through the annular gap 14 exhaust port.

[0033] In a preferred embodiment, the handle 2 is provided with a control switch 22 and an indicator light, and the control switch 22 is set as a push-pull type switch or a button type switch. The single-chip control unit 5 is assembled in the handle 2 and is arranged near the main air inlet for better heat dissipation. The single-chip control unit 5 controls the temperature of the heating unit 3 and the parameters of the rotation speed of the fan unit 4. Internal wiring (not shown) electrically connects the PCB to the heating unit 3, the fan unit 4 and the cable. The control switch 22 is provided and connected to the PCB, and the user can select four-speed temperature settings (natural wind / first gear temperature (low temperature) / second gear temperature (medium temperature) / third gear temperature (high temperature)) and three-speed wind speed (first gear wind speed (low speed) / second gear wind speed (medium speed) / third gear wind speed (high speed)) settings.

[0034] In a preferred embodiment, the fan unit 4 is disposed in the hollow structure of the handle 2, and the fan unit 4 is composed of a motor 41 and a fan blade 42. The fan unit 4 draws air through the main air inlet, and the air flows through the air inlet channel of the handle 2 and enters the hair dryer body 1. After being heated around the electric heating core unit, the air is quickly discharged through the annular gap 14 exhaust port. The power system of the fan unit 4 is a forward and reverse frequency conversion motor, which can be reversed regularly to remove dust from the filter screen, and at the same time, it plays a role in cooling the single-chip control unit 5, reducing the probability of unexplained shutdown or overheating shutdown.

[0035] In a preferred embodiment, in order to isolate external impurities and improve the diversion effect on the incoming and outgoing air, the filter device 6 includes an outer cylindrical coarse filter device 61 and an inner stainless steel filter device 62 arranged at the air inlet. The outer cylindrical coarse filter device 61 and the inner stainless steel filter device 62 can be removed and can be cleaned by wiping or brushing.

[0036] In a preferred embodiment, a honeycomb component 7 is provided inside the tubular interior of the handle 2. The honeycomb component 7 is integrally connected to the inner wall of the handle 2 to support and strengthen the handle 2 and reduce resistance to incoming wind.

[0037] Working principle: The main air entering the handle 2 passes through the air inlet of the filter device 6 and is driven by the fan unit 4 to be sent to the annular cavity 13 and ejected by the annular gap 14 exhaust port. The air from the outside of the rear of the hair dryer body 1 is sucked by the fast airflow discharged from the annular gap 14 exhaust port, generating a Coanda effect. The ejected air flow and the sucked air flow constitute the total air flow ejected forward from the annular gap lead-out section. That is, the Coanda effect is generated at the inner wall surface of the annular gap 14 exhaust port, so that the air output of the hair dryer has a certain air amplification effect, which can effectively increase the air output. Among them, the setting of the exhaust port of the annular gap 14 has an amplifying effect on the air flow. When the air flows out from the annular gap 14 exhaust port, according to the Coanda effect, this part of the air (called the first airflow) will be adsorbed on the inner wall surface of the air outlet guide component and flow along the inner wall surface, so that a certain negative pressure is generated in the central area of ​​the annular inner wall curved surface, so that a large amount of surrounding air is sucked in, and the first airflow and the surrounding airflow merge to form a fast and high-capacity airflow outflow, realizing the air amplification effect. In addition, the air of the handle 2 of the present invention flows in a direct current direction to the annular cavity 13 of the hair dryer body 1, which reduces the loss of wind speed and wind pressure, so that the wind speed is larger and more stable, and the hair is dried faster.

[0038] Experimental tests were performed on the handheld hair dryer of the embodiment, as follows:

[0039] Wind speed: Remove the air nozzle and use an anemometer to test the highest wind speed on the axis of the air outlet at 0mm, 100mm and 200mm away from the air outlet;

[0040] Air volume: Remove the air nozzle and use an electronic scale to measure the wind force (i.e., air volume) on the axis of the air outlet at 10mm, 100mm, and 200mm from the air outlet.

[0041] Electronic scale measuring range: 0-500 g / s;

[0042] Anemometer measurement range: 0.3m / s~45m / s;

[0043] Ambient temperature: 23.8°.

[0044] Experimental results:

[0045]

[0046] Experimental results:

[0047] The maximum wind speed measured by Dyson is 16.86m / s, which is basically consistent with the value advertised by Dyson (17m / s) and the value of online evaluation (16-17m / s), indicating that our measurement method is credible.

[0048] After a large number of prototype tests, we finally proved that the hair dryer has the best air output effect when the gap of the annular gap 14 is 2mm.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A handheld hair dryer, comprising a hair dryer body and a handle, characterized in that: The hair dryer body includes a body shell and a disc-shaped component, the body shell includes an annular outer shell and an internal cylindrical component concentrically arranged with the annular outer shell, the annular outer shell includes an open shell end and a shell tail end, the shell tail end is sealed and connected to the internal cylindrical component, the disc-shaped component is connected to the internal cylindrical component, an annular gap is formed between the outer circumferential wall surface of the disc-shaped component and the open end of the shell, an annular cavity is arranged between the annular outer shell and the internal cylindrical component, a heating unit is arranged in the annular cavity, an air inlet opening is arranged on the annular outer shell, the air inlet opening is connected to one end of the handle, the handle is a hollow structure, the hollow structure is an air inlet channel, a fan unit and a single-chip control unit are arranged in the hollow structure, a filter device is arranged at the end of the handle away from the hair dryer body, and the cross-section of the body shell through the center axis is E-shaped.

2. A handheld hair dryer according to claim 1, characterized in that: The outer circumferential wall surface of the disc-shaped component constitutes the inner lead-out surface of the annular gap, and the inner wall surface of the annular outer shell forms an annular guide inclined surface at the open end of the shell, and the annular guide inclined surface constitutes the outer lead-out surface of the annular gap.

3. A handheld hair dryer according to claim 2, characterized in that: The outer circumferential wall surface of the disc-shaped component includes an annular gap forming section wall surface and an annular gap lead-out section wall surface, the annular gap forming section wall surface constitutes the inner guide surface of the annular gap, and the annular gap lead-out section wall surface is connected to the annular gap forming section wall surface and forms an inner angle less than 180°.

4. A handheld hair dryer according to claim 1, characterized in that: The width of the annular gap is 0.5 mm to 5 mm, and the angle between the center line of the annular gap and the central axis of the air inlet channel is not less than 90°.

5. A handheld hair dryer according to claim 3, characterized in that: The annular gap forming segment wall surface and the annular guide inclined surface are arranged in an staggered manner inside and outside to form the annular gap of the air outlet.

6. A handheld hair dryer according to claim 1, characterized in that: The included angle between the central plane of the annular gap and the horizontal central axis of the hair dryer body is 5° to 55°.

7. A handheld hair dryer according to claim 3, characterized in that: The wall surface of the annular gap forming section is an inclined surface or a curved surface, and the wall surface of the annular gap leading-out section is an inclined surface or a curved surface.

8. A handheld hair dryer according to claim 1, characterized in that: One end of the internal cylindrical component protrudes from the open end of the shell and is provided with an external thread, and one end of the disc-shaped component is provided with an internal thread, the internal thread is meshed with the external thread, the disc-shaped component is connected to the main shell, and the size and shape of the annular gap are adjusted.

9. A handheld hair dryer according to claim 1, characterized in that: The cross section of the disc-shaped component passing through the central axis is also E-shaped.

10. A handheld hair dryer according to claim 1, characterized in that: A support structure is arranged in the annular cavity, the heating unit is arranged inside the support structure, the single chip control unit is placed in one end of the handle close to the filter device, the filter device includes an outer cylindrical coarse filter device and an inner stainless steel filter device, and the power system of the fan unit is a forward and reverse frequency conversion motor.

Images