Graphene low-voltage high-speed wireless blower

Abstract

The graphene low-pressure high-speed wireless blower comprises a shell and an airflow channel in the shell in the airflow direction, and the airflow channel is formed by sequentially connecting a motor cavity, a divergent air channel cavity and a heating cavity; the divergent air duct cavity is composed of a divergent fan cover arranged in the airflow direction, and the divergent angle of the divergent air duct cavity is not larger than 7 degrees; the rear cover is fixedly connected with a shell body at the air inlet end of the shell to form an air inlet cavity; the front cover is fixedly connected with a shell body at the air outlet end of the shell to form an air outlet cavity, a heating cavity is arranged in the air outlet cavity, a heating body is arranged in the heating cavity and comprises a cross-shaped fixing frame, a heating wire and a temperature controller, the heating wire is an iron-chromium wire, a graphene layer is sprayed on the surface of the heating wire, and the handle cover is fixedly connected with a shell body at the handle end of the shell to form a handle cavity. The fluid air channel design is adopted for the air channel, turbulence noise is reduced, power is supplied by using the low voltage of 24V or below, and the risk of high-voltage electric shock is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hair dryers, and more particularly to a graphene low-voltage and high-speed wireless hair dryer. Background Art

[0002] Traditional high-speed hair dryers must be plugged in, and the high-voltage power supply (220V) poses a risk of leakage in humid environments. At the same time, it is inconvenient to use in the bathroom, travel or outdoor scenes, and the wind noise is sharp (generally >80dB), which affects comfort. Most high-speed hair dryers still rely on high temperature to assist in drying (especially high-power mode), and long-term use will cause frizzy and split hair. Traditional heating elements (such as nickel-chromium wires) have uneven temperatures and may overheat locally. The high temperature of the heating element may burn the scalp or children. Therefore, the problems of high voltage and high noise in traditional high-speed hair dryers on the market are technical problems that need to be solved urgently in this field.

[0003] Chinese Patent Document 1 (Application Number: 202010828617.8, Application Date: 2020.08.18) discloses a flat-surface heating cordless hair dryer, comprising a body assembly, wherein the body assembly comprises an air inlet, an air outlet head, and a handle portion arranged between the air inlet and the air outlet head; an air outlet motor is arranged in the air outlet head; the flat-surface heating cordless hair dryer is a complete structure; an energy storage battery for powering the air outlet motor is arranged in the handle portion, thereby getting rid of the limitation of fixed-point plug-in power supply of traditional hair dryers, and the energy storage battery is made of polymer material; a non-metallic material for heating is also arranged in the air outlet head. A non-metallic flat heating device, the non-metallic flat heating device includes a heating element component and an air duct structure component; the heating element component is fixed on the air duct structure component; the heating element component is composed of a non-metallic conductive heating material, a high-temperature adhesive and a high-temperature resistant insulating material mixed and deployed according to the resistance value; the non-metallic conductive heating material includes graphene and PI carbon fiber, and the heating temperature of the non-metallic conductive heating material is greater than 200°C. In this solution, the heating element component adopts a non-metallic conductive heating material, a high-temperature adhesive and a high-temperature resistant insulating material mixed and deployed according to the resistance value, wherein the non-metallic conductive heating material includes graphene and PI carbon fiber. Chinese Patent Document 2 (Application Number: 202221502442.2, Application Date: June 16, 2022) discloses a graphene hair dryer comprising a housing, a front end of the housing having an air outlet grille, a rear end of the housing having an air inlet grille, a heating device fixed inside the housing, and a fan assembly at the rear end of the heating device, thereby drawing air into the housing through the air inlet grille, raising the air temperature through heating by the heating device, and then blowing the hot air outward from the air outlet grille; the housing comprises at least one heat-receiving unit, the heat-receiving unit comprising a ceramic body and a graphene coating, the graphene coating covering the outer surface of the ceramic body, and the at least one heat-receiving unit being adjacent to the heating device, so that the at least one heat-receiving unit releases far-infrared rays outward after absorbing heat. The above two solutions do not solve the problem of high noise levels in traditional high-speed hair dryers. Summary of the Invention

[0004] In view of this, the present invention provides a graphene low-voltage and high-speed wireless hair dryer to solve the problems of high-voltage leakage risk, loud noise, and local overheating caused by uneven temperature in existing high-speed hair dryers.

[0005] The present application provides a graphene low-voltage and high-speed wireless hair dryer, comprising:

[0006] The shell comprises an air inlet end and an air outlet end of the shell arranged along the air flow direction, and also comprises a shell handle end arranged perpendicular to the air inlet end of the shell; an axial streamlined air flow channel is provided in the shell, and the air flow channel is a gradually expanding channel, and the cross-section of the gradually expanding channel in the direction perpendicular to the air flow direction is circular, and along the air flow direction, the air flow channel is composed of a motor cavity, a gradually expanding air duct cavity, and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding wind hood arranged along the air flow direction, and in the direction from the air inlet end of the shell to the air outlet end of the shell, the radius of the cross-section of the gradually expanding air duct cavity gradually increases, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a motor is provided in the motor cavity, and the air flow direction of the air flow channel is consistent with the motor shaft direction of the motor;

[0007] The back cover is a circular cover with air flow holes evenly distributed on its surface, the back cover is fixedly connected to the shell at the air inlet end of the outer shell to form an air inlet cavity; the back cover serves as an air inlet and is located at the air inlet end of the air inlet cavity; the air inlet cavity includes the connected motor cavity and the gradually expanding air duct cavity, the motor is provided in the motor cavity along the horizontal direction and on the same axis as the air inlet, a fan is provided at the front end of the motor away from the air inlet along the air flow direction, the fan is located on the shaft end of the motor, and the air outlet of the motor is connected to the wind cover; an elastic support structure is also provided in the motor cavity, and the motor and the fan are fixed in the elastic support structure;

[0008] The front cover is a circular cover plate, and the front cover is fixedly connected to the shell of the air outlet end of the shell to form an air outlet cavity, and the air outlet cavity is communicated with the air inlet cavity; the front cover serves as an air outlet, and is located at the air outlet end of the air outlet cavity. Along the air flow direction, the air outlet and the air inlet are located on the same axis, and a uniform wind net is also provided on the inner side of the front cover at the air outlet; the air outlet cavity includes the heating cavity, and the heating cavity is connected to the gradually expanding air duct cavity, and the heating cavity includes The mica tube of a cylindrical cavity, wherein one end of the mica tube near the air inlet is connected to the wind hood, and a heating element on the same axis as the air inlet is further provided in the mica tube, and the heating element is coaxially arranged with the mica tube; the heating element comprises a front end and a rear end, along the direction of air flow, the rear end is one end close to the wind hood, and the front end is one end close to the front cover, and the front end of the heating element is fixed to the positioning slot of the uniform wind net, the heating element comprises a cross fixing frame, a heating wire and a temperature controller, the cross fixing frame is composed of two mica sheets arranged perpendicular to each other, and the two mica sheets intersect to form the central axis of the cross fixing frame, the cross fixing frame comprises four free ends arranged in sequence along the clockwise direction, the four free ends are respectively arranged relatively parallel to the central axis, and the distance between the four free ends and the central axis is the same; each of the free ends is provided with at least one "凵"-shaped groove, and the "凵"-shaped groove is a groove recessed in the direction of the central axis, from the rear end to the front end, the The depth of the "凵"-shaped groove increases successively, the depth increment of adjacent "凵"-shaped grooves is 0.5mm-1mm, and the interval between two adjacent "凵"-shaped grooves is 3.5mm-5.5mm; the heating wire is located in the "凵"-shaped groove, and the heating wire is spirally wound around the cross fixing frame with the central axis as the axis. The heating wire is an iron-chromium wire, and a graphene layer is sprayed on the surface of the iron-chromium wire. The temperature controller is fixed to the mica sheet by riveting;

[0009] A handle cover is fixedly connected to the shell at the handle end of the outer shell to form a handle cavity. The handle cover is located on the same side of the rear cover. The handle cavity is isolated from the air flow channel by an isolation plate, and the isolation plate is also provided with a wire hole. A battery pack is provided in the handle cavity, and the battery pack is used to power the motor and the heating element. A main control board accommodating cavity is also provided in the handle cavity. The main control board accommodating cavity is isolated from the air flow channel, and a main control board is provided in the main control board accommodating cavity. The heating element, the temperature controller, and the motor are electrically connected to the main control board respectively for controlling the temperature of the heating element and the speed gear adjustment of the motor. The battery pack supplies power to the heating element through the main control board. The front end face of the shell at the handle end of the outer shell is also provided with a button electrically connected to the main control board. A charging hole is also provided on the shell at the handle end of the outer shell for charging the battery pack. The battery life of the battery pack is 15 minutes to 30 minutes. The operating voltage of the battery pack is 12V to 24V.

[0010] Optionally, the heating wire is a sheet-like structure, and the width of the heating wire is adapted to the width of the “凵”-shaped groove;

[0011] The thickness of the heating wire is 0.25mm-0.3mm.

[0012] Optionally, the thickness of the graphene layer is 1 nm-3 nm.

[0013] Optionally, the elastic support structure is a silica gel and / or rubber damping layer.

[0014] Optionally, the battery pack is a rechargeable energy storage battery;

[0015] The capacity of the battery pack is 18000mah.

[0016] Optionally, the button includes a first button and a second button;

[0017] The first button and the second button are electrically connected to the main control board respectively;

[0018] The first button is used to control the on / off of the graphene low-voltage and high-speed wireless hair dryer and adjust the wind speed and power of the graphene low-voltage and high-speed wireless hair dryer;

[0019] The second button is used to control the heating power of the graphene low-voltage and high-speed wireless hair dryer.

[0020] Optionally, the charging port includes a DC round charging port and a Type-C charging port.

[0021] Optionally, the rated speed of the motor is 10 5 rpm-1.3ⅹ105 rpm.

[0022] Compared with the prior art, the graphene low-voltage and high-speed wireless hair dryer provided by the present invention achieves at least the following beneficial effects:

[0023] First, the air duct of the hair dryer of the present invention adopts a fluid air duct design to reduce turbulent noise (which can be controlled below 60dB);

[0024] Second, the hair dryer of the present invention uses a low voltage power supply below 24V, avoiding the risk of high voltage electric shock, and is particularly suitable for humid environments such as bathrooms;

[0025] Third, the heating element of the hair dryer of the present invention is made of iron chromium and surface-sprayed graphene. Graphene has a high thermal conductivity, which enables instantaneous heating (heating within 1 second), reducing preheating waiting time. The heating element and mica tube form a three-dimensional structure to ensure uniform heat distribution, avoiding local overheating and damage to hair.

[0026] Fourth, the blower of the present invention integrates a low-voltage power supply, uses graphene to efficiently generate heat to maintain the wind temperature, and is equipped with a high-speed brushless motor to reduce the power consumption of the entire machine (approximately 200-300W), making it more energy-efficient.

[0027] Fifth, wireless design. The hair dryer is equipped with a high-capacity battery pack inside, and is equipped with Type-C charging and ordinary charging ports on the bottom. It can be connected to a power bank or mobile phone charger to achieve wireless use, get rid of the restrictions of the socket, and be more portable. It is suitable for outdoor camping, gyms and other scenarios.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0029] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0031] Figure 1 This is a schematic cross-sectional view of a graphene low-voltage, high-speed wireless hair dryer provided by the present invention;

[0032] Figure 2 This is a schematic structural diagram of a heating element in a graphene low-voltage, high-speed wireless hair dryer provided by the present invention;

[0033] Figure 3 The present invention provides a schematic structural diagram of a graphene low-voltage and high-speed wireless hair dryer.

[0034] Among them, 1. Back cover; 2. High-speed motor; 3. Fan cover; 4. Outer shell; 5. Heating element; 5.1. Cross fixing bracket; 5.2. Heating wire; 5.3. Temperature controller; 6. Front cover; 7.1. First button; 7.2. Second button; 8. DC round charging port; 9. Type-c charging port; 10. Handle cover; 11. Battery pack; 12. Main control board; 13. Mica tube. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0037] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0038] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0040] Example 1

[0041] Reference Figure 1-Figure 3 As shown, Figure 1 This is a schematic cross-sectional view of a graphene low-voltage, high-speed wireless hair dryer provided by the present invention; Figure 2 This is a schematic structural diagram of a heating element in a graphene low-voltage, high-speed wireless hair dryer provided by the present invention; Figure 3 The present invention provides a schematic structural diagram of a graphene low-voltage and high-speed wireless hair dryer.

[0042] The present application provides a graphene low-pressure, high-speed wireless hair dryer, comprising: a housing 4, the housing 4 comprising an air inlet end and an air outlet end arranged along the airflow direction, and also comprising a housing handle end arranged perpendicular to the air inlet end of the housing; an axially streamlined airflow channel is provided in the housing 4, the airflow channel is a gradually expanding channel, and the cross-section of the gradually expanding channel in a direction perpendicular to the airflow direction is circular, and along the airflow direction, the airflow channel is composed of a motor cavity, a gradually expanding air duct cavity, and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding wind cover 3 arranged along the airflow direction, and the radius of the cross-section of the gradually expanding air duct cavity gradually increases in the direction from the air inlet end of the housing to the air outlet end of the housing, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a motor 2 is provided in the motor cavity, and the airflow direction of the airflow channel is consistent with the motor shaft direction of the motor 2;

[0043] The back cover 1 is a circular cover with evenly distributed air flow holes on the surface. The back cover is fixedly connected to the shell at the air inlet end of the shell to form an air inlet cavity; the back cover 1 is located at the air inlet end of the air inlet cavity as an air inlet; the air inlet cavity includes a connected motor cavity and a gradually expanding air duct cavity. The motor cavity is provided with a high-speed motor 2 (rated speed of 10 5 rpm-1.3ⅹ10 5 rpm), along the direction of airflow, a fan is provided at the front end of the motor away from the air inlet, the fan is located on the shaft end of the motor, and the air outlet of the motor 2 is connected to the wind cover 3; an elastic support structure is also provided in the motor cavity, and the motor and the fan are fixed in the elastic support structure.

[0044] The front cover 6 is a circular cover plate, which is fixedly connected to the shell of the air outlet end of the shell to form an air outlet cavity, which is communicated with the air inlet cavity; the front cover 6 serves as an air outlet and is located at the air outlet end of the air outlet cavity. Along the air flow direction, the air outlet and the air inlet are located on the same axis. At the air outlet, a uniform wind net is also provided on the inner side of the front cover 6. The air outlet cavity includes a heating cavity, which is connected to the gradually expanding air duct cavity. The heating cavity includes a mica tube 13 with a cylindrical cavity. The mica tube 13 is connected to the gradually expanding air duct cavity. One end of the tube 13 near the air inlet is connected to the wind cover, and a heating element 5 is also provided in the mica tube 13 on the same axis as the air inlet. The heating element 5 is coaxially arranged with the mica tube 13; the heating element 5 includes a front end and a rear end. Along the airflow direction, the rear end is the end close to the wind cover 3, and the front end is the end close to the front cover 6. The front end of the heating element 5 is fixed to the positioning groove of the uniform air network. The heating element 5 includes a cross fixing frame 5.1, a heating wire 5.2 and a temperature controller 5.3. The cross fixing frame 5 .1 comprises two mica sheets arranged perpendicular to each other, the two mica sheets intersecting to form the central axis of the cross-mounted frame 5.1. The cross-mounted frame 5.1 includes four free ends arranged in a clockwise direction, each of which is arranged parallel to the central axis and equidistant from the central axis. Each free end is provided with at least one "凵"-shaped groove, which is recessed toward the central axis. The groove depth of the "凵"-shaped groove increases from the rear end to the front end. The groove depth of adjacent "凵"-shaped grooves increases by 0.5mm-1mm, and the spacing between two adjacent "凵"-shaped grooves is 3.5mm-5.5mm. The heating wire 5.2 is located in the "凵"-shaped groove. The heating wire 5.1 is spirally wound around the cross-mounted frame 5.1 with the central axis as its axis. The heating wire 5.1 is an iron-chromium wire with a graphene layer sprayed on its surface. The temperature controller 5.3 is fixed to the mica sheet by riveting.

[0045] The handle cover 10 is fixedly connected to the shell at the handle end of the outer shell to form a handle cavity. The handle cover 10 is located on the same side of the rear cover 1. The handle cavity is isolated from the air flow channel by an isolation plate, and the isolation plate is also provided with a wire hole; a battery pack 11 is provided in the handle cavity, and the battery pack 11 is used to power the high-speed motor 2 and the heating element; a main control board accommodating cavity is also provided in the handle cavity, and the main control board accommodating cavity is isolated from the air flow channel. A main control board 12 is provided in the main control board accommodating cavity, and the heating element 5, the temperature controller 5.3, and the high-speed motor 2 are electrically connected to the main control board 12 respectively for controlling the temperature of the heating element 5 and the speed gear adjustment of the motor 5.3; the battery pack 11 supplies power to the heating element 5 through the main control board 12; the front end face of the shell at the handle end of the outer shell is also provided with a button electrically connected to the main control board 12; the shell at the handle end of the outer shell is also provided with a charging hole for charging the battery pack 11; the battery life of the battery pack 11 is 15 minutes to 30 minutes; the operating voltage of the battery pack 11 is 12V to 24V.

[0046] Specifically, if Figure 1 As shown, the core components of the graphene low-voltage and high-speed wireless hair dryer of this embodiment include a shell 4, a high-speed motor 2, a heating element 5 (sprayed with graphene), a mica tube 13, a main control board 12, a battery pack 11, a charging port and other components. The shell 4 is an integral structure, which includes an shell air inlet end and a shell air outlet end arranged along the air flow direction, and also includes a shell handle end arranged perpendicular to the shell air inlet end; an axial streamlined air flow channel is provided in the shell 4 along the air flow direction, and the air flow channel is a gradually expanding channel, and the cross-section of the gradually expanding channel in the direction perpendicular to the air flow direction is circular, and along the air flow direction, the air flow channel is composed of a motor cavity, a gradually expanding air duct cavity, and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding wind hood 3 arranged along the air flow direction, in the direction from the shell air inlet end to the shell air outlet end, as shown in the figure, in the horizontal direction, the radius of the cross-section of the gradually expanding air duct cavity gradually increases, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a high-speed motor 2 is arranged in the motor cavity, and the air flow direction of the air flow channel is consistent with the motor shaft direction of the motor; that is, a hair dryer body portion arranged in the horizontal direction and a handle portion arranged in the vertical direction, and the hair dryer body portion includes an air inlet portion and an air outlet portion along the air flow direction.

[0047] like Figure 1 、 Figure 3As shown, the graphene low-pressure, high-speed cordless hair dryer also includes a back cover 1. Back cover 1 is a circular cover plate with evenly distributed airflow holes on its surface. It is fixedly connected to the housing at the air inlet end of the outer shell, forming an air inlet chamber. Back cover 1 serves as the air inlet and is located at the air inlet end of the air inlet chamber. The air inlet chamber includes a motor chamber and a gradually expanding air duct chamber. A high-speed motor 2 is located within the motor chamber, horizontally aligned with the air inlet. A fan is located at the front end of the high-speed motor 2, away from the air inlet, along the airflow direction. The fan is located on the motor shaft end, and the motor's air outlet is connected to the air hood. An elastic support structure is also provided within the motor chamber, and the motor and fan are fixed within the elastic support structure. The method of fixing the back cover to the housing is not specifically limited in this embodiment and can be a fastening connection, a threaded connection, a snap-fit ​​connection, or other methods, and can be adjusted according to actual conditions. The motor in the air inlet chamber is a high-speed motor. Its high speed drives the fan blades to rotate at high speed, generating a large amount of strong airflow in a short period of time. The high-speed motor works in conjunction with a temperature controller to maintain a stable air temperature, reducing the risk of overheating and hair damage. Specifically, the high-speed brushless motor used in this embodiment has infinitely variable speed, and the wind speed and power can be adjusted by adjusting the motor according to the button. It has an ultra-high speed. Compared with the 2W-3Wrpm speed of the traditional brushed motor, the high-speed brushless motor used in this embodiment can usually reach a speed of 10W-13W revolutions per minute (RPM), which directly increases the air volume and wind speed; it can start quickly and reach the maximum speed instantly after power is turned on without the need for waste heat; it can reduce noise and vibration, and uses a high-speed brushless motor without mechanical friction, eliminates the carbon brush structure, reduces high-frequency "sizzling" sound, and reduces noise Reduce 5dB-10dB; the high-speed brushless motor used adopts precision bearings and symmetrical impeller design, and has been dynamically balanced to reduce resonance and abnormal noise; the brushless motor has a service life of 2000 hours to 5000 hours, which can extend the service life; it uses heat-resistant magnetic steel and ceramic bearings, which are resistant to high temperatures and can adapt to long-term high-temperature operation; it can be frequency-controlled and the speed can be accurately controlled by the circuit, with low-temperature gear speed reduction and high-temperature gear speed increase, which can save energy by 15% to 30%; the motor has a built-in sensor that can adjust the power in real time to prevent overheating and burning, and has a temperature protection function.

[0048] It should be noted that the airflow direction of the axial streamlined air duct is consistent with the high-speed motor shaft to achieve the shortest path and the lowest noise; at the same time, a gradually expanding air duct design is adopted to control the expansion angle of the diffuser hood of the gradually expanding section (diffusion section) within 7° to slow down the airflow, restore static pressure, avoid turbulence, avoid sharp turns or sudden changes in cross-section, and at the same time, a gradually expanding design is adopted to move the airflow separation point backward to reduce eddy currents.

[0049] The elastic support structure is a silica gel and / or rubber damping layer fixed to the outer shell surface of the motor and fan, isolating the transmission of motor vibration to the air duct and absorbing high-frequency vibration.

[0050] The back cover 1 adopts a fine honeycomb structure to disperse airflow noise; the air outlet has added a uniform air net; and it is also equipped with a high-precision axial fan and a high-speed brushless motor.

[0051] The front cover 6 is a ring-shaped cover plate, which is fixedly connected to the shell body at the air outlet end of the outer shell to form an air outlet cavity, and the air outlet cavity is connected to the air inlet cavity; the front cover 6 serves as an air outlet, is located at the air outlet end of the air outlet cavity, along the direction of air flow, the air outlet and the air inlet are located on the same axis, and at the air outlet, on the inner side of the front cover 6, there is also a uniform wind net; the air outlet cavity includes a heating cavity, which is connected to the gradually expanding air duct cavity, and the heating cavity includes a mica tube 13 with a cylindrical cavity, and the end of the mica tube 13 near the air inlet is connected to the wind hood, and a heating element 5 on the same axis as the air inlet is further provided in the mica tube, and the heating element 5 is coaxially arranged with the mica tube 13; the heating element 5 includes a front end and a rear end, along the direction of air flow, the rear end is the end close to the wind hood 3, and the front end is the end close to the front cover 6, and the front end of the heating element 5 is fixed to the positioning groove of the uniform wind net. It should be noted that the heating element is placed in the mica tube to form a cavity, which is arranged between the motor and the air outlet. The mica tube plays the role of high-temperature resistant support, insulation support, heat insulation, and isolation protection of the plastic shell.

[0052] like Figure 2 As shown, the heating element 5 includes a cross-mounted frame 5.1, a heating wire 5.2, and a temperature controller 5.3. The cross-mounted frame 5.1 is composed of two mica sheets arranged perpendicular to each other. The two mica sheets intersect to form the central axis of the cross-mounted frame 5.1. The central axis divides the frame plate into four equally divided areas, and two adjacent areas are perpendicular to each other. The central axis serves as the fixed end of the frame plate, and the two opposite ends of the frame plate are free ends. That is, the cross-mounted frame 5.1 includes four free ends arranged in sequence in a clockwise direction, and the free ends are arranged relatively parallel to the central axis. The distance between the free end and the central axis is the same; the free end is provided with at least one "凵"-shaped groove, which is concave toward the central axis. Along the airflow direction, that is, from the rear end to the front end, the groove depth of the "凵"-shaped groove increases successively. The groove depth of adjacent "凵"-shaped grooves increases by 0.5mm-1mm, and the spacing between two adjacent "凵"-shaped grooves is 3.5mm-5.5mm. In other words, the depth of the "凵"-shaped groove at the rear end near the air inlet is shallow, and the depth of the groove gradually increases toward the front end. The heating wire 5.2 is spirally wound within the groove. Specifically, the heating wire 5.2 is located in the "凵"-shaped groove and is spirally wound around the cross fixing frame 5.1 with the central axis as the axis. The heating wire 5.2 is an iron-chromium wire with a graphene layer sprayed on its surface.

[0053] It should be noted that the heating element and the uniform wind network positioning groove of the air outlet are fixed in position and direction, and are installed in the mica tube to form a heating cavity. The rear end of the mica tube is connected to the wind cover, and finally connected to the back cover of the air inlet to form an air duct; the core component of the powered heating element is the heating wire (heating wire) + graphene coating. Its working principle is based on the thermal effect of electric current (Joule's law). When electric current passes through a high-resistance material, electrical energy can be converted into thermal energy. According to Joule's law, when current passes through a resistor, heat is generated. Heat (Q) = current 2 (I 2 ) x resistance (R) x time (t); along the direction of airflow, the heating element is between the rear end of the motor and the air outlet.

[0054] It should be noted that the temperature controller 5.3 is fixed to the mica sheet by riveting. The function of the temperature controller is to automatically cut off the power when the temperature is too high. Specifically, in this embodiment, there is one temperature controller, which is installed on a cross fixing frame. The cross fixing frame is made of mica sheet, and a hole is opened on a mica sheet and placed on it, and it is riveted to the mica sheet with copper rivets.

[0055] The handle cover 10 is fixedly connected to the shell at the handle end of the outer shell to form a handle cavity. The handle cover 10 is located on the same side of the rear cover 1. The handle cavity is isolated from the air flow channel by an isolation plate, and the isolation plate is also provided with a wire hole; a battery pack 11 is provided in the handle cavity, and the battery pack 11 is used to power the high-speed motor 2 and the heating element 5; a main control board accommodating cavity is also provided in the handle cavity, and the main control board accommodating cavity is isolated from the air flow channel. A main control board 12 is provided in the main control board accommodating cavity, and the heating element 5, the temperature controller 5.3, and the high-speed motor 2 are respectively electrically connected to the main control board 12 for controlling the temperature of the heating element 5 and the speed gear adjustment of the high-speed motor 2.

[0056] Specifically, the heating element, temperature controller, and high-speed brushless motor are all connected to the main control board through the wire holes with a wiring harness. The temperature level and hot and cold air are adjusted by two buttons. When the temperature of the heating element is too high, the temperature controller will feedback information to the main control board, adjust the current of the heating element, control the output power, and reduce the heat conversion rate.

[0057] The battery pack 11 supplies power to the heating element 5 via the main control board 12. A button electrically connected to the main control board 12 is located on the front of the housing at the handle end. A charging port is also provided on the housing at the handle end for charging the battery pack. The battery pack 11 has a battery life of 15 to 30 minutes and operates at a voltage of 12V to 24V.

[0058] It should be noted that in this embodiment, the selection of the battery pack needs to consider endurance, power, safety and service life; the endurance needs to meet the normal working time: 15-30 minutes; in terms of power, the battery pack capacity is 18000mah; in terms of safety, it is necessary to have a protection circuit (overcharge, overdischarge, temperature, short circuit), and at the same time, the battery pack needs to meet multiple charging modes, fast charging, Type-C fast charging interface and DC round charging hole. The battery pack can provide low voltage, and the working voltage is 12V-24V. In this embodiment, the material of the battery pack is selected as lithium polymer (LiPo).

[0059] It should be noted that in this embodiment, the front cover 6, the rear cover 1 and the handle cover 10 are all detachable structures.

[0060] In this embodiment, the hair dryer can be used under the condition of less than 24V safe voltage.

[0061] Embodiment 2

[0062] As shown in Figure 1-Figure 3 , the application provides a graphene low-voltage high-speed wireless hair dryer, which comprises: a shell 4, the shell 4 comprises a shell air inlet end and a shell air outlet end arranged along the airflow direction, and a shell handle end arranged vertically with the shell air inlet end; an axial streamline airflow channel is arranged in the shell, the airflow channel is a gradually expanding channel, the cross section of the gradually expanding channel in the direction perpendicular to the airflow direction is circular, and along the airflow direction, the airflow channel is composed of a motor cavity, a gradually expanding air duct cavity and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding air duct 3 arranged along the airflow direction, the radius of the cross section of the gradually expanding air duct cavity gradually increases in the direction from the shell air inlet end to the shell air outlet end, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a high-speed motor 2 is arranged in the motor cavity, and the airflow direction of the airflow channel is consistent with the motor shaft direction of the high-speed motor 2.

[0063] The rear cover 1 is a circular cover plate with uniformly distributed airflow holes, and the rear cover is fixedly connected with the shell at the air inlet end of the shell, forming an air inlet cavity; the rear cover 1 serves as an air inlet and is located at the air inlet end of the air inlet cavity; in the air inlet cavity, the motor cavity and the gradually expanding air duct cavity are connected, in the motor cavity, a high-speed motor 2 (rated speed of 10 5 rpm-1.3ⅹ10 5 rpm) is arranged along the horizontal direction and on the same axis as the air inlet, and along the airflow direction, a fan is arranged at the front end of the high-speed motor 2 away from the air inlet, the fan is arranged on the shaft end of the motor, the air outlet of the high-speed motor 2 is connected with the air duct 3, and the motor cavity is also provided with an elastic support structure, and the motor and the fan are fixed in the elastic support structure.

[0064] The front cover 6 is a circular ring type cover plate, which is fixedly connected with the shell at the air outlet end of the shell to form an air outlet cavity, and the air outlet cavity is communicated with the air inlet cavity; the front cover 6 serves as an air outlet and is located at the air outlet end of the air outlet cavity; along the airflow direction, the air outlet and the air inlet are located on the same axis; at the air outlet, a uniform air outlet net is arranged on the inner side of the front cover 6; the air outlet cavity includes a heating cavity, and the heating cavity is connected with a gradually expanding air duct cavity; the heating cavity includes a cylindrical cavity mica tube 13, one end of the mica tube 13 near the air inlet is connected with the air baffle 3, and a heating body 5 on the same axis as the air inlet is further arranged in the mica tube 13; the heating body 5 is coaxially arranged with the mica tube 13; the heating body 5 includes a front end and a rear end; along the airflow direction, the rear end is the end close to the air baffle 3, and the front end is the end close to the front cover 6; the front end of the heating body 5 is fixed with the positioning groove of the uniform air outlet net; the heating body 5 includes a cross-shaped fixing frame 5.1, a heating wire 5.2 and a temperature controller 5.3; the cross-shaped fixing frame 5.1 is composed of two mutually perpendicular mica sheets; the two mica sheets intersect to form the central axis of the cross-shaped fixing frame 5.1; the cross-shaped fixing frame 5.1 includes four free ends arranged in sequence in the clockwise direction; the four free ends are arranged in parallel with the central axis respectively; the distances between the four free ends and the central axis are the same; at least one 'N' shaped groove is arranged on each free end; the 'N' shaped groove is a groove recessed towards the central axis; from the rear end to the front end, the groove depths of the 'N' shaped grooves increase in sequence; the groove depth increment of adjacent 'N' shaped grooves is 0.5mm-1mm; the interval size between adjacent two 'N' shaped grooves is 3.5mm-5.5mm; the heating wire 5.2 is located in the 'N' shaped groove; the heating wire 5.1 is spirally wound on the cross-shaped fixing frame 5.1 with the central axis as the axis; the heating wire 5.1 is a ferrochrome wire, and a graphene layer is sprayed on the surface of the ferrochrome wire; the temperature controller 5.3 is fixed on the mica sheet by riveting; in this embodiment, the heating wire is in a sheet structure, the width of the heating wire is matched with the width of the 'N' shaped groove, that is, the matching requirement is met; the thickness of the heating wire is 0.25mm-0.3mm.

[0065] It should be noted that the selection of the heating wire needs to consider the resistance and heat generation; according to the resistance formula, R = p LA (p is resistivity, L is length, and A is cross-sectional area). According to the formula, the larger the diameter of the heating wire (the cross-sectional area A increases) → the smaller the resistance R → the larger the current under the same voltage, and the higher the heat generation (Joule's law Q = I 2 Rt); the smaller the diameter → the greater the resistance → the more concentrated the heating, but it may be overheated and fused. The increase in width increases the contact area with the airflow, and the heat transfer is more efficient, and the outlet air temperature is uniform.

[0066] The handle cover 10 is fixedly connected to the shell at the handle end of the outer shell to form a handle cavity. The handle cover 10 is located on the same side of the rear cover 1. The handle cavity is isolated from the air flow channel by an isolation plate, and the isolation plate is also provided with a wire hole; a battery pack 11 is provided in the handle cavity, and the battery pack 11 is used to power the high-speed motor 2 and the heating element 5; a main control board accommodating cavity is also provided in the handle cavity, and the main control board accommodating cavity is isolated from the air flow channel. A main control board 12 is provided in the main control board accommodating cavity, and the heating element 5, the temperature controller 5.3, and the high-speed motor 2 are electrically connected to the main control board 12 respectively for controlling the temperature of the heating element 5 and the speed gear adjustment of the high-speed motor 2; the battery pack 11 supplies power to the heating element 5 through the main control board 12; the front end face of the shell at the handle end of the outer shell is also provided with a button electrically connected to the main control board 12; a charging hole is also provided on the shell at the handle end of the outer shell for charging the battery pack 11, and the battery life of the battery pack 11 is 15 minutes to 30 minutes; the operating voltage of the battery pack is 12V-24V.

[0067] In this embodiment, the hair dryer can be used under the condition of a safety voltage lower than 24V.

[0068] Example 3

[0069] like Figure 1-Figure 3 As shown, the present application provides a graphene low-pressure, high-speed wireless hair dryer, comprising: a shell 4, the shell 4 comprising a shell air inlet end and a shell air outlet end arranged along the air flow direction, and also comprising a shell handle end arranged perpendicular to the shell air inlet end; an axially streamlined air flow channel is provided in the shell, the air flow channel is a gradually expanding channel, and the cross-section of the gradually expanding channel in the direction perpendicular to the air flow direction is circular, and along the air flow direction, the air flow channel is composed of a motor cavity, a gradually expanding air duct cavity, and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding wind hood 3 arranged along the air flow direction, and in the direction from the shell air inlet end to the shell air outlet end, the radius of the cross-section of the gradually expanding air duct cavity gradually increases, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a high-speed motor 2 is provided in the motor cavity, and the air flow direction of the air flow channel is consistent with the motor shaft direction of the high-speed motor 2.

[0070] The back cover 1 is a circular cover with evenly distributed air flow holes on the surface. The back cover is fixedly connected to the shell at the air inlet end of the shell to form an air inlet cavity; the back cover 1 is located at the air inlet end of the air inlet cavity as an air inlet; the air inlet cavity includes a connected motor cavity and a gradually expanding air duct cavity. The motor cavity is provided with a high-speed motor 2 (rated speed of 10 5 rpm-1.3ⅹ10 5rpm), along the direction of airflow, a fan is provided at the front end of the high-speed motor 2 away from the air inlet, the fan is located on the shaft end of the motor, the air outlet of the high-speed motor 2 is connected with a wind cover 3, and an elastic support structure is also provided in the motor cavity, and the motor and the fan are fixed in the elastic support structure.

[0071] The front cover 6 is a circular cover plate. The front cover 6 is fixedly connected to the shell of the air outlet end of the shell to form an air outlet cavity, which is connected to the air inlet cavity. The front cover 6 serves as an air outlet and is located at the air outlet end of the air outlet cavity. Along the air flow direction, the air outlet and the air inlet are located on the same axis. At the air outlet, a uniform air net is also provided on the inner side of the front cover 6. The air outlet cavity includes a heating cavity, which is connected to the gradually expanding air duct cavity. The heating cavity includes a mica tube 13 with a cylindrical cavity. One end of the mica tube 13 near the air inlet is connected to the wind cover 3, and a heating element 5 is also provided in the mica tube on the same axis as the air inlet. The heating element 5 is coaxially arranged with the mica tube 13; the heating element 5 includes a front end and a rear end. Along the airflow direction, the rear end is the end close to the wind cover 3, and the front end is the end close to the front cover 6. The front end of the heating element 5 is fixed to the positioning groove of the uniform air network. The heating element 5 includes a cross fixing frame 5.1, a heating wire 5.2 and a temperature controller 5.3. The cross fixing The frame 5.1 is composed of two mica sheets arranged perpendicular to each other. The two mica sheets intersect to form the central axis of the cross-fixing frame 5.1. The cross-fixing frame 5.1 includes four free ends arranged in sequence in a clockwise direction. The four free ends are respectively arranged relatively parallel to the central axis, and the distance between the four free ends and the central axis is the same; each free end is provided with at least one "凵"-shaped groove. The "凵"-shaped groove is a groove concave toward the central axis. The groove depth of the "凵"-shaped groove increases from the rear end to the front end. The groove depth increase of adjacent "凵"-shaped grooves is 0.5-1mm, and the spacing between two adjacent "凵"-shaped grooves is 3.5mm-5.5mm; the heating wire 5.2 is located in the "凵"-shaped groove. The heating wire 5.1 is spirally wound around the cross-fixing frame 5.1 with the central axis as the axis. The heating wire 5.1 is an iron-chromium wire with a graphene layer sprayed on the surface of the iron-chromium wire. The thickness of the graphene layer is 1nm-3nm. The temperature controller 5.3 is fixed to the mica sheet by riveting; in this embodiment, the heating wire is a sheet-like structure, and the width of the heating wire is adapted to the width of the "凵"-shaped groove, that is, it meets the matching requirements; the thickness of the heating wire is 0.25mm-0.3mm.

[0072] It should be noted that in this embodiment, the thickness of the graphene layer is 1nm-3nm. The selection of its thickness affects the efficiency of the heating element. The graphene layer can make the heating element have high electrothermal conversion efficiency: the graphene layer has low resistance (resistivity of about 10 -6The graphene layer can quickly heat up: the thermal conductivity coefficient is as high as 5300 W / (m·K), and the working temperature can be reached in 1-3 seconds (the traditional electric heating wire needs 5-10 seconds); the effects brought by the graphene layer include self-limiting temperature characteristics, uniform heating, the graphene slurry can be made into a bendable heating wire, and the graphene heating wire is ultra-thin, light, anti-aging and more durable.

[0073] The handle cover 10 is fixedly connected with the shell of the handle end of the shell, forms a handle cavity, and is located on the same side of the rear cover 1. The handle cavity is isolated from the airflow channel by an isolation plate, and a wire hole is further arranged on the isolation plate. In the handle cavity, a battery pack 11 is arranged, which is used to supply power to the high-speed motor 2 and the heating body 5. A main control board accommodating cavity is further arranged in the handle cavity, which is isolated from the airflow channel. A main control board 12 is arranged in the main control board accommodating cavity. The heating body 5, the temperature controller 5.3 and the high-speed motor 2 are electrically connected with the main control board, respectively, for controlling the temperature of the heating body 5 and the speed gear adjustment of the high-speed motor 2. The battery pack 11 supplies power to the heating body 5 through the main control board 12. The front end surface of the shell of the handle end of the shell is further provided with a button electrically connected with the main control board 12. A charging hole is further arranged on the shell of the handle end of the shell, which is used to charge the battery pack 11. The endurance time of the battery pack 11 is 15-30 minutes. The working voltage of the battery pack 11 is 12-24 V.

[0074] In this embodiment, the hair dryer can be used under the condition of a safe voltage lower than 24 V.

[0075] Embodiment 4

[0076] As shown in Figure 1-Figure 3 The graphene low-voltage high-speed wireless hair dryer provided by the application comprises a shell 4, the shell 4 comprises a shell air inlet end and a shell air outlet end arranged along an airflow direction, and further comprises a shell handle end arranged perpendicularly to the shell air inlet end. An axial flow line type airflow channel is arranged in the shell. The airflow channel is a gradually expanding channel. The cross section of the gradually expanding channel in the direction perpendicular to the airflow direction is circular. Along the airflow direction, the airflow channel is sequentially connected by a motor cavity, a gradually expanding air duct cavity and a heating cavity. The gradually expanding air duct cavity is composed of a gradually expanding air baffle 3 arranged along the airflow direction. In the direction from the shell air inlet end to the shell air outlet end, the radius of the cross section of the gradually expanding air duct cavity gradually increases. The expansion angle of the gradually expanding air duct cavity is not greater than 7°. A high-speed motor 2 is arranged in the motor cavity. The airflow direction of the airflow channel is consistent with the motor shaft direction of the high-speed motor 2.

[0077] The rear cover 1 is a circular cover plate with uniformly distributed airflow holes. The rear cover is fixedly connected with the shell at the air inlet end of the shell, forming an air inlet chamber. The rear cover 1 serves as an air inlet and is located at the air inlet end of the air inlet chamber. Inside the air inlet chamber, there are a motor cavity and a gradually expanding air duct cavity. Inside the motor cavity, there is a high-speed motor 2 (with a rated speed of 10 5 rpm-1.3ⅹ10 5 rpm) arranged along the horizontal direction and on the same axis as the air inlet. The front end of the high-speed motor 2 away from the air inlet is provided with a fan on the shaft end of the high-speed motor 2. The high-speed motor 2 is connected with a fan cover 3. The motor cavity is also provided with an elastic support structure, and the high-speed motor 2 and the fan are fixed in the elastic support structure.

[0078] The front cover 6 is a circular ring cover plate. The front cover 6 is fixedly connected with the shell at the air outlet end of the shell, forming an air outlet chamber. The air outlet chamber is communicated with the air inlet chamber. The front cover 6 serves as an air outlet and is located at the air outlet end of the air outlet chamber. Along the airflow direction, the air outlet is located on the same axis as the air inlet. At the air outlet, a uniform air distribution net is arranged on the inner side of the front cover 6. Inside the air outlet chamber, there is a heating cavity. The heating cavity is connected with the gradually expanding air duct cavity. The heating cavity includes a cylindrical cavity mica tube 13. One end of the mica tube 13 near the air inlet is connected with the fan cover 3. The mica tube 13 is also provided with a heating body 5 on the same axis as the air inlet. The heating body 5 is coaxially arranged with the mica tube 13. The heating body 5 includes a front end and a rear end. Along the airflow direction, the rear end is the end close to the fan cover 3, and the front end is the end close to the front cover 6. The front end of the heating body 5 is fixed with the positioning groove of the uniform air distribution net. The heating body 5 includes a cross-shaped fixing frame 5.1, a heating wire 5.2, and a temperature controller 5.3. The cross-shaped fixing frame 5.1 is composed of two mutually perpendicular mica sheets. The two mica sheets intersect to form the central axis of the cross-shaped fixing frame 5.1. The cross-shaped fixing frame 5.1 includes four free ends arranged in sequence along the clockwise direction. The four free ends are arranged in parallel with the central axis, respectively. The distance between the four free ends and the central axis is the same. Each free end is provided with at least one "N" shaped groove. The "N" shaped groove is a groove recessed towards the central axis. From the rear end to the front end, the groove depth of the "N" shaped groove increases in sequence. The groove depth increment of adjacent "N" shaped grooves is 0.5mm-1mm. The interval size between adjacent two "N" shaped grooves is 3.5mm-5.5mm. The heating wire 5.2 is located in the "N" shaped groove. The heating wire 5.1 is spirally wound on the cross-shaped fixing frame 5.1 with the central axis as the axis. The heating wire 5.1 is an iron-chromium wire. The surface of the iron-chromium wire is sprayed with a graphene layer. The thickness of the graphene layer is 1nm-3nm. The temperature controller 5.3 is fixed on the mica sheet by riveting. In this embodiment, the heating wire is in a sheet structure. The width of the heating wire is adapted to the width of the "N" shaped groove, i.e., it meets the matching requirements. The thickness of the heating wire is 0.25mm-0.3mm.

[0079] The handle cover 10 is fixedly connected to the shell at the handle end of the outer shell to form a handle cavity. The handle cover 10 is located on the same side of the rear cover 1. The handle cavity is isolated from the air flow channel by an isolation plate, and the isolation plate is also provided with a wire hole; a battery pack 11 is provided in the handle cavity, and the battery pack 11 is used to power the high-speed motor 2 and the heating element 5; a main control board accommodating cavity is also provided in the handle cavity, and the main control board accommodating cavity is isolated from the air flow channel. A main control board 12 is provided in the main control board accommodating cavity, and the heating element 5, the temperature controller 5.3, and the high-speed motor 2 are electrically connected to the main control board 12 respectively for controlling the temperature of the heating element 5 and the speed gear adjustment of the high-speed motor 2; the battery pack 11 supplies power to the heating element 5 through the main control board 12; the front end face of the shell at the handle end of the outer shell is also provided with a button electrically connected to the main control board 12; a charging hole is also provided on the shell at the handle end of the outer shell for charging the battery pack 11, and the battery life of the battery pack 11 is 15 minutes to 30 minutes; the operating voltage of the battery pack 11 is 12V-24V. In this embodiment, the battery pack 11 is a rechargeable energy storage battery; the capacity of the battery pack 11 is 18000 mAh.

[0080] In this embodiment, the hair dryer can be used under the condition of a safety voltage lower than 24V.

[0081] Example 5

[0082] like Figure 1-Figure 3 As shown, the present application provides a graphene low-pressure, high-speed wireless hair dryer, comprising: a shell 4, the shell 4 comprising a shell air inlet end and a shell air outlet end arranged along the air flow direction, and also comprising a shell handle end arranged perpendicular to the shell air inlet end; an axially streamlined air flow channel is provided in the shell, the air flow channel is a gradually expanding channel, and the cross-section of the gradually expanding channel in the direction perpendicular to the air flow direction is circular, and along the air flow direction, the air flow channel is composed of a motor cavity, a gradually expanding air duct cavity, and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding wind hood 3 arranged along the air flow direction, and in the direction from the shell air inlet end to the shell air outlet end, the radius of the cross-section of the gradually expanding air duct cavity gradually increases, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a high-speed motor 2 is provided in the motor cavity, and the air flow direction of the air flow channel is consistent with the motor shaft direction of the high-speed motor 2.

[0083] The back cover 1 is a circular cover with evenly distributed air flow holes on the surface. The back cover is fixedly connected to the shell at the air inlet end of the shell to form an air inlet cavity; the back cover 1 is located at the air inlet end of the air inlet cavity as an air inlet; the air inlet cavity includes a connected motor cavity and a gradually expanding air duct cavity. The motor cavity is provided with a high-speed motor 2 (rated speed of 10 5 rpm-1.3ⅹ10 5rpm), the front end of the motor is provided with a fan away from the air inlet in the airflow direction, the fan is located on the shaft end of the high-speed motor 2, the air outlet of the high-speed motor 2 is connected with a fan cover 3, and the motor cavity is further provided with an elastic support structure, and the motor and the fan are fixed in the elastic support structure.

[0084] The front cover 6 is a circular ring type cover plate, and the front cover 6 is fixedly connected with the shell at the air outlet end of the shell to form an air outlet cavity, the air outlet cavity is communicated with the air inlet cavity; the front cover 6 serves as an air outlet and is located at the air outlet end of the air outlet cavity, the air outlet and the air inlet are located on the same axis in the airflow direction, and a uniform air net is further arranged at the inner side of the front cover 6 at the air outlet; the air outlet cavity comprises a heating cavity, the heating cavity is connected with a gradually expanding air duct cavity, the heating cavity comprises a cylindrical cavity mica tube 13, one end of the mica tube 13 close to the air inlet is connected with the fan cover 3, and a heating body 5 on the same axis with the air inlet is further arranged in the mica tube 13, and the heating body 5 is coaxially arranged with the mica tube 13; the heating body 5 comprises a front end and a rear end, the rear end is close to the fan cover 3 in the airflow direction, and the front end is close to the front cover 6; the front end of the heating body 5 is fixed with the positioning groove of the uniform air net, the heating body 5 comprises a cross-shaped fixing frame 5.1, a heating wire 5.2 and a temperature controller 5.3, the cross-shaped fixing frame 5.1 is composed of two mutually perpendicular mica sheets, the two mica sheets intersect to form a central axis of the cross-shaped fixing frame 5.1, the cross-shaped fixing frame 5.1 comprises four free ends arranged in sequence in the clockwise direction, the four free ends are arranged in parallel with the central axis respectively, and the distances between the four free ends and the central axis are the same; at least one “N” shaped groove is arranged on each free end, the “N” shaped groove is a groove recessed towards the central axis, the groove depth of the “N” shaped groove increases in sequence from the rear end to the front end, the groove depth of adjacent “N” shaped grooves increases by 0.5mm-1mm, and the interval size between adjacent two “N” shaped grooves is 3.5mm-5.5mm; the heating wire 5.2 is located in the “N” shaped groove, the heating wire 5.1 is spirally wound on the cross-shaped fixing frame 5.1 with the central axis as the axis, the heating wire 5.1 is a ferrochrome wire, a graphene layer is sprayed on the surface of the ferrochrome wire, and the thickness of the graphene layer is 1nm-3nm. The temperature controller 5.3 is fixed on the mica sheet by riveting, the heating wire is a sheet structure, the width of the heating wire is matched with the width of the “N” shaped groove, that is, the matching requirement is met, and the thickness of the heating wire is 0.25mm-0.3mm.

[0085] The handle cover 10 is fixedly connected to the shell at the handle end of the outer shell to form a handle cavity. The handle cover 10 is located on the same side of the rear cover 1. The handle cavity and the air flow channel are isolated by an isolation plate, and the isolation plate is also provided with a wire hole; a battery pack 11 is provided in the handle cavity, and the battery pack 11 is used to power the high-speed motor 2 and the heating element 5; a main control board accommodating cavity is also provided in the handle cavity, and the main control board accommodating cavity is isolated from the air flow channel. A main control board 12 is provided in the main control board accommodating cavity, and the heating element 5, the temperature controller 5.3, and the high-speed motor 2 are electrically connected to the main control board respectively for controlling the temperature of the heating element 5 and the speed gear adjustment of the high-speed motor 2; the battery pack 11 supplies power to the heating element 5 through the main control board 12; the front end face of the shell at the handle end of the outer shell is also provided with a button electrically connected to the main control board 12; a charging hole is also provided on the shell at the handle end of the outer shell for charging the battery pack 11, and the battery life of the battery pack is 15 minutes-30 minutes; the operating voltage of the battery pack is 12V-24V. In this embodiment, the battery pack 11 is a rechargeable energy storage battery; the capacity of the battery pack 11 is 18000 mAh.

[0086] In this embodiment, the buttons specifically include a first button 7.1 and a second button 7.2; the first button 7.1 and the second button 7.2 are respectively electrically connected to the main control board 12; the first button 7.1 is used to control the on / off of the graphene low-voltage, high-speed wireless hair dryer and adjust the wind speed of the graphene low-voltage, high-speed wireless hair dryer; the second button 7.2 is used to control the heating power of the graphene low-voltage, high-speed wireless hair dryer.

[0087] The charging ports include a DC round charging port 8 and a Type-C charging port.

[0088] In this embodiment, the bottom is equipped with a Type-c charging port and a DC round charging port, which can be connected to a power bank or a mobile phone charger to achieve wireless use, get rid of the socket restriction, and be more portable. In this embodiment, the hair dryer can be used under conditions below a safe voltage of 24V.

[0089] Example 6

[0090] When using the hair dryer of Examples 1-5, the hair dryer is activated by pressing a button. Specifically, a 3-second press of button 7.1 turns the hair dryer on and off. Button 7.1 adjusts the hair dryer's wind speed and power, while button 7.2 adjusts the heating power. After the high-speed motor 2 is activated, air enters through the air inlet of the rear cover 1, enters the passageway of the high-speed motor 2, blows into the air hood 3, and then enters the passageway formed by the graphene-coated heating element 5 and the mica tube 13. Simultaneously, the heating element 5 generates heat, which heats the air, ultimately blowing the hot air out of the front cover 6.

[0091] Adopt the decibel appearance to carry out the noise measurement, fix the hair dryer, the microphone distance air outlet 50cm (standard test distance), will fix the hair dryer on the support, the air outlet is toward the uninhabited area, the microphone is placed in the air outlet directly in front of 50cm, the height is with the air outlet center alignment. Close other noise source (such as air conditioner, fan). Start preheating: run the hair dryer 1 minute, make motor and heating wire stable. Then carry out the sub-grade test: low speed (cold wind), record the average noise (dBA) in 10 seconds;Speed (hot wind), test the noise under the highest power;Each grade test is carried out multiple point measurement, and is tested in 0°, 45°, 90° direction of air outlet respectively, and the maximum value is taken. Data record: save the maximum noise (Lmax) and equivalent continuous noise (Leq) of each gear. Through the test, the noise of the graphene low-voltage high-speed wireless hair dryer obtained by the application can be controlled below 60dB.

[0092] In the scheme of the application, a graphene coating is used. The application of the graphene coating generally does not directly reduce the power of the electric hair dryer, but can affect the energy efficiency performance in the following ways:

[0093] Improve the electric heating conversion efficiency: the resistivity of graphene is low (~10 -6 Ω·m), and there is almost no energy loss after electrification, and the heating efficiency is close to 100% (about 70-80% for traditional nichrome wire). In theory, under the same power, the graphene heating body can provide higher heat output;Fast heating: the thermal conductivity of graphene is extremely high (5300W / m·K), and the target temperature can be reached in 1-3 seconds, reducing the energy waste in the preheating stage;Infrared radiation heating: part of the electric energy is converted into far infrared radiation, directly heating the hair, reducing the dependence on high-temperature airflow, and possibly indirectly reducing the required air volume (thereby reducing the motor power consumption).

[0094] Through measurement (measuring input power consumption with a power meter or calculating effective heat power by air volume and temperature difference), the graphene high-efficiency heating is used to maintain the air temperature, and the high-speed brushless motor is matched to reduce the overall power consumption (about 200-300W).

[0095] As can be seen from the above embodiments, the graphene low-voltage high-speed wireless hair dryer provided by the application at least achieves the following beneficial effects:

[0096] 1、The air duct of the hair dryer of the application adopts fluid air duct design, reducing turbulent noise (which can be controlled below 60dB);

[0097] 2、The hair dryer of the application uses low-voltage 24V or below power supply to avoid high-voltage electric shock risk, especially suitable for humid environments such as bathrooms;

[0098] 3、The heating body material of the hair dryer is made of iron-chromium + surface spraying graphene, the thermal conductivity of graphene is high, instant heating (temperature rise within 1 second) can be realized, the preheating waiting time is reduced, the heating body is installed in the mica tube to form a cavity, the rear end is a motor and the front end is an air outlet, when the heating body generates heat, due to the low thermal conductivity of mica and the heat insulation effect, heat loss is avoided, heat conduction to the shell and other accessories is avoided, the heating body and the mica tube form a three-dimensional structure to ensure uniform distribution of heat, and local overheating damage to the hair is avoided; and the cavity formed by the heating body and the mica tube plays the role of high-temperature resistant support, insulation support, heat insulation and isolation protection of the plastic shell;

[0099] 4、The hair dryer integrates low-voltage power supply, uses graphene high-efficiency heating to maintain wind temperature, and is matched with a high-speed brushless motor to reduce the power consumption (about 200-300W) of the whole machine and save energy more;

[0100] 5、Wireless design, the hair dryer is internally provided with a high-capacity battery pack, and is provided with a Type-c charging and ordinary charging port at the bottom, can be connected with a power bank or a mobile phone charger, realizes wireless use, gets rid of the socket restriction, is more portable, and is suitable for outdoor camping, gymnasium and other scenes.

[0101] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A graphene low-voltage and high-speed wireless hair dryer, characterized in that: include: The shell comprises an air inlet end and an air outlet end of the shell arranged along the air flow direction, and also comprises a shell handle end arranged perpendicular to the air inlet end of the shell; an axial streamlined air flow channel is provided in the shell, and the air flow channel is a gradually expanding channel, and the cross-section of the gradually expanding channel in the direction perpendicular to the air flow direction is circular, and along the air flow direction, the air flow channel is composed of a motor cavity, a gradually expanding air duct cavity, and a heating cavity connected in sequence; the gradually expanding air duct cavity is composed of a gradually expanding wind hood arranged along the air flow direction, and in the direction from the air inlet end of the shell to the air outlet end of the shell, the radius of the cross-section of the gradually expanding air duct cavity gradually increases, and the expansion angle of the gradually expanding air duct cavity is not greater than 7°; a motor is provided in the motor cavity, and the air flow direction of the air flow channel is consistent with the motor shaft direction of the motor; A rear cover, which is a circular cover plate with evenly distributed airflow holes on its surface, and is fixedly connected to the shell at the air inlet end of the housing to form an air inlet cavity; The rear cover serves as an air inlet and is located at the air inlet end of the air inlet cavity; the air inlet cavity includes the connected motor cavity and the gradually expanding air duct cavity; the motor cavity is provided with the motor on the same axis as the air inlet in the horizontal direction; along the airflow direction, a fan is provided at the front end of the motor away from the air inlet, the fan is located on the shaft end of the motor, and the air outlet of the motor is connected to the wind cover; an elastic support structure is also provided in the motor cavity, and the motor and the fan are fixed in the elastic support structure; Front cover, the front cover is an annular cover plate, and the front cover is fixedly connected to the housing at the air outlet end of the outer shell to form an air outlet cavity, and the air outlet cavity is communicated with the air inlet cavity; the front cover serves as an air outlet and is located at the air outlet end of the air outlet cavity. Along the air flow direction, the air outlet and the air inlet are on the same axis. At the air outlet, an air distribution net is further provided inside the front cover; inside the air outlet cavity, including the heating cavity body, the heating cavity body is connected to the gradually expanding air duct cavity body. The heating cavity body includes a mica tube with a cylindrical cavity. One end of the mica tube near the air inlet is connected to the air hood, and a heating element on the same axis as the air inlet is further provided inside the mica tube. The heating element is coaxially arranged with the mica tube; the heating element includes a front end and a rear end. Along the air flow direction, the rear end is the end close to the air hood, and the front end is the end close to the front cover. The front end of the heating element is fixed to the positioning groove of the air distribution net. The heating element includes a cross fixing frame, a heating wire and a temperature controller. The cross fixing frame is composed of two mica sheets arranged perpendicular to each other. The two mica sheets intersect to form the central axis of the cross fixing frame. The cross fixing frame includes four free ends arranged in sequence in the clockwise direction. The four free ends are relatively parallel to the central axis respectively, and the distances between the four free ends and the central axis are the same; at least one "凵"-shaped groove is provided on each free end. The "凵"-shaped groove is a groove recessed towards the central axis. From the rear end to the front end, the groove depth of the "凵"-shaped groove gradually increases. The groove depth increase of adjacent "凵"-shaped grooves is 0.5 mm - 1 mm, and the interval dimension between adjacent two "凵"-shaped grooves is 3.5 mm - 5.5 mm; the heating wire is located in the "凵"-shaped groove, and the heating wire is spirally wound around the cross fixing frame with the central axis as the axis. The heating wire is an iron-chromium wire, and a graphene layer is sprayed on the surface of the iron-chromium wire. The temperature controller is fixed on the mica sheet by riveting; The handle cover is fixedly connected to the housing of the handle end of the shell to form a handle cavity. The handle cover is on the same side as the rear cover. The handle cavity is isolated from the air flow channel by a partition plate, and a wire passing hole is also provided on the partition plate. Inside the handle cavity, there is a battery pack for supplying power to the motor and the heating element. Inside the handle cavity, there is also a main control board accommodation cavity isolated from the air flow channel. A main control board is provided in the main control board accommodation cavity. The heating element, the temperature controller, and the motor are respectively electrically connected to the main control board to control the temperature of the heating element and the speed gear adjustment of the motor. The battery pack supplies power to the heating element through the main control board. On the front end face of the housing of the handle end of the shell, there is also a button electrically connected to the main control board. A charging hole is also provided on the housing of the handle end of the shell for charging the battery pack. The battery pack has a battery life of 15 minutes to 30 minutes. The working voltage of the battery pack is 12V to 24V.

2. The graphene low-voltage high-speed wireless hair dryer according to claim 1, wherein The heating wire is in a sheet structure, and the width of the heating wire is adapted to the width of the "U"-shaped groove; The thickness of the heating wire is 0.25 mm to 0.3 mm; The thickness of the graphene layer is 1 nm to 3 nm.

3. The graphene low-voltage high-speed wireless hair dryer according to claim 1, wherein The elastic support structure is a silicone and / or rubber damping layer.

4. The graphene low-voltage high-speed wireless hair dryer according to claim 1, wherein The battery pack is a rechargeable energy storage battery; The capacity of the battery pack is 18000 mah.

5. The graphene low-voltage high-speed wireless hair dryer according to claim 1, wherein The button includes a first button and a second button; The first button and the second button are respectively electrically connected to the main control board; The first button is used to control the on / off of the graphene low-voltage high-speed wireless hair dryer and adjust the wind speed and power of the graphene low-voltage high-speed wireless hair dryer; The second button is used to control the heating power of the graphene low-voltage high-speed wireless hair dryer.

6. The graphene low-voltage high-speed wireless hair dryer according to claim 1, wherein The charging hole includes a DC round charging hole and a Type-c charging port.

7. The graphene low-voltage high-speed wireless hair dryer according to claim 1, wherein The rated speed of the motor is 10 5 rpm-1.3ⅹ10 5 rpm.

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