A hair dryer with a constant speed cruise function

Abstract

The application discloses a hair dryer with a constant-speed cruise function, and solves the problem that a hand needs to press an operating part all the time in a strong mode, which easily leads to operation fatigue and poor use experience. The technical scheme is that the hair dryer comprises a shell, a motor installed in the shell, a fan blade driven to rotate by the motor, and a start-stop speed regulating device used for controlling the motor. The start-stop speed regulating device comprises a button switch, a switch trigger, a speed regulating knob and a knob self-locking structure. The button switch is used for controlling the start and stop of the motor and the rotating speed. The switch trigger is used for controlling the button switch. The speed regulating knob is used for driving the switch trigger to act. The knob self-locking structure is used for locking the position of the speed regulating knob. The start-stop speed regulating device further comprises a strong mode reinforcing locking part. The strong mode reinforcing locking part is matched with the knob self-locking structure to lock the position of the speed regulating knob when the speed regulating knob is rotated to the maximum angle.

Description

[Technical Field]

[0001] This invention belongs to the field of garden tool technology, specifically relating to a hair dryer. [Background Technology]

[0002] Hair dryers are a common garden cleaning tool used to remove twigs, fallen leaves, dust, gravel, and stagnant water and snow. Users need to use hair dryers in various conditions. Therefore, in addition to starting and stopping, hair dryers should have speed adjustment and cruise control functions. Current hair dryer speed adjustment methods include: potentiometer speed control (requiring an additional potentiometer and matching electronic control program, resulting in higher costs and a risk of electrostatic discharge); circuit board speed adjustment (allowing selection between preset speeds, leading to speed jumps and another risk of electrostatic discharge); and mechanical integrated knob speed control (using a knob, trigger, and push-button switch with stepless speed regulation for both adjustment and speed setting). This method typically involves directly locking the speed control knob to the casing; turning the knob can cause the screw to loosen due to stress, disabling the speed control function.

[0003] For an integrated knob speed control, please refer to Chinese Utility Model Patent No. CN204536978U, which discloses a speed control switch structure for an electric hair dryer. The structure includes a speed control knob, a speed control switch, and a switch trigger, all mounted on a housing. The switch trigger connects the speed control knob and the speed control switch. The speed control knob is fixed to the housing by a fastener. The lever of the speed control knob engages with the switch trigger, enabling linkage between the speed control knob and the switch trigger. A first circular washer is provided between the fastener and the speed control knob, and a second circular washer is provided between the fastener and the housing. A damping structure with axial clamping force is provided between the fastener and the first circular washer. By adding a damping structure to the switch trigger structure of a push-button switch, a speed control function is achieved.

[0004] In summary, in the existing technology, the cruise control function is achieved through an integrated knob, which is locked by applying axial force through a damping structure. The integrated knob may loosen due to radial force on the screw, and the knob will automatically reset, causing the cruise control function to fail.

[0005] To improve the user experience, existing hair dryers also have a powerful mode that quickly increases the hair dryer's speed to its maximum performance level. This is useful when encountering large or heavy gravel, foreign objects, wet leaves, or other special situations. In traditional designs, this mode requires a separate signal switch and operating components. The separate signal switch is expensive to manufacture, and maintaining this mode requires the user to keep pressing the operating components, which can easily lead to user fatigue and a poor user experience. [Summary of the Invention]

[0006] To address the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide a hair dryer with a constant speed cruise function, which solves the problem that the user needs to keep pressing the operating parts in the powerful mode, which can easily lead to operator fatigue and poor user experience.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A hair dryer with constant speed cruise function includes a housing, a motor installed in the housing, a fan blade driven to rotate by the motor, and a start / stop speed control device for controlling the motor. The start / stop speed control device includes a push-button switch, a switch trigger, a speed control knob, and a knob self-locking structure. The push-button switch is used to control the start / stop and speed of the motor, the switch trigger is used to control the push-button switch, the speed control knob is used to drive the switch trigger, and the knob self-locking structure is used to lock the position of the speed control knob. The start / stop speed control device also includes a high-power mode enhanced locking component, which cooperates with the knob self-locking structure to lock the position of the speed control knob when the speed control knob is rotated to its maximum angle.

[0009] Preferably, the speed control knob includes a knob body located outside the housing and a fixed base located inside the housing and connected to the knob body. The knob body drives the fixed base to rotate synchronously. The fixed base is provided with a switch trigger drive structure that drives the switch trigger to operate. The strong mode enhanced locking assembly is provided with a radial locking member that radially locks the fixed base.

[0010] Preferably, the switch trigger drive structure is a cam portion located at an eccentric position on the fixed base, and a first locking surface is provided between the cam portion and the radial locking member.

[0011] Preferably, the radial locking member includes a locking button, a fixing pin, and a compression spring. The locking button is rotatably mounted on the switch trigger via the fixing pin, and the compression spring is installed between the first end of the locking button and the switch trigger. The first end of the locking button is provided with a second locking surface that engages with the cam portion under the action of the compression spring.

[0012] Preferably, the first locking surface is a convex surface located radially outward of the cam portion, and the second locking surface is a concave surface located at the first end of the locking button; and / or, the joint between the knob body and the fixing seat is provided with a concave-convex fitting structure.

[0013] Preferably, the switch trigger has a rotating shaft on its left and right sides, the housing has a rotating shaft hole, the rotating shaft is rotatably supported in the rotating shaft hole, the rotating shaft has a pin hole, and the two ends of the fixing pin are rotatably supported in the pin hole; and / or, the second end of the lock button has an unlocking operation part, and the lock button is unlocked by operating the unlocking operation part.

[0014] Preferably, the fixed base is provided with a support shaft, and the strong mode reinforced locking assembly includes a torsion spring mounted on the support shaft. When the speed control knob is rotated to its maximum angle, the torsion spring drives the cam part to cooperate with the radial locking member to lock the position of the speed control knob.

[0015] Preferably, the torsion spring has a first leg and a second leg, and the fixed base has a first leg support part that acts on the first leg and a second leg support part that acts on the second leg at predetermined angles along the circumference. The housing has a limiting support surface on the radially outer side of the fixed base. Within the predetermined rotation angle of the fixed base, the position of the fixed base is restricted by the knob self-locking structure. When the speed control knob is rotated to near the maximum angle, the first leg begins to act with the limiting support surface. When the speed control knob is rotated to the maximum angle, the torsion spring and the compression spring act simultaneously to restrict the position of the speed control knob.

[0016] Preferably, the knob self-locking structure includes a wave-shaped washer disposed between the fixed base and the housing, and the knob body has a central protrusion at the center of its end that connects with the fixed base. The wave-shaped washer is sleeved on the central protrusion, and the wave-shaped washer presses the fixed base axially.

[0017] Preferably, the speed control knob also includes a screw that moves through a mounting base and is threadedly connected to the knob body.

[0018] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0019] 1. Starting from the initial position, rotating the speed control knob drives the switch trigger, which in turn activates the push-button switch, thus starting the hair dryer. The speed control knob can be adjusted to any position between the hair dryer's initial startup and high-performance mode. Due to the knob's self-locking mechanism, the speed control knob position is locked, and correspondingly, the switch trigger and push-button switch positions are also locked, maintaining the hair dryer's current performance and achieving constant speed control. When the speed control knob is in the high-performance mode, the enhanced locking component, in conjunction with the knob's self-locking mechanism, locks the speed control knob position, achieving high-performance mode lock-in. The hair dryer exits high-performance mode only after the enhanced locking component is unlocked, releasing the speed control knob's reset restriction. This solves the problem of requiring continuous manual pressing of operating components in high-performance mode, which can lead to operator fatigue and a poor user experience.

[0020] 2. The knob body drives the fixed base to rotate synchronously. The switch trigger drive structure on the fixed base drives the switch trigger to actuate, realizing the speed control knob driving the switch trigger to make a toggling action. Furthermore, locking the fixed base achieves self-locking of the entire speed control knob, facilitating self-locking of the speed control knob. Existing conventional knob self-locking structures achieve self-locking of the speed control knob by applying axial force. In this invention, the strong mode enhanced locking component is equipped with a radial locking member that locks the fixed base radially. Thus, when the speed control knob is in the high-performance mode position of the hair dryer, the speed control knob is locked from both the axial and radial directions, ensuring the hair dryer's strong mode lock-on operation.

[0021] 3. The fixed base is eccentrically positioned with a cam section. Because the cam section has a gradually changing cam surface, when the button switch is triggered, rotating the speed control knob causes the cam surface to drive the switch trigger to rotate at a constant speed, thus pressing down the button switch at a constant speed. The larger the speed control rotation angle, the more powerful the hair dryer. Therefore, it can be adjusted to any position between the hair dryer's initial startup and high-performance mode. A locking surface is provided between the cam section and the radial locking element, so locking the cam section locks the speed control knob.

[0022] 4. The compression spring acts between the switch trigger and the locking button. Therefore, while the speed control knob drives the switch trigger, when the speed control knob is in the high-performance position of the blower, the locking surface of the first end of the locking button locks with the locking surface on the cam under the action of the compression spring, thereby locking the positions of the speed control knob and the switch trigger.

[0023] 5. The joint between the knob body and the fixed base is provided with a concave-convex fitting structure, so as to realize the synchronous rotation of the knob body and the fixed base, and lock the fixed base, thus realizing the self-locking of the entire speed control lock knob.

[0024] 6. Since the rotating shaft and the fixing pin are coaxial, the speed adjustment knob acts on the locking button, and then on the switch trigger, which can drive the switch trigger to rotate synchronously.

[0025] The unlocking mechanism is pressed by the operator's finger, allowing for quick unlocking of the lock.

[0026] 7. The enhanced locking component in the powerful mode is also equipped with a torsion spring. When the speed control knob is rotated to its maximum angle, the torsion spring drives the fixed base to cooperate with the locking button to lock the position of the speed control knob, thereby locking the position of the speed control knob and the switch trigger in the high-performance mode of the hair dryer.

[0027] 8. Within the set rotation angle of the fixed base, the position of the fixed base is restricted by the knob self-locking structure, and the first leg always acts with the first leg support part, the second leg always acts with the second leg support part, and the first leg also gradually approaches the limiting support surface; when the speed control knob is rotated to near the maximum angle, the first leg begins to act with the limiting support surface and disengages from the first leg support part; when the speed control knob is rotated to the maximum angle, the limiting support surface exerts a reverse rotational force on the speed control knob through the torsion spring. The torsion spring and the compression spring act simultaneously to restrict the position of the speed control knob, realizing the fixed speed of the hair dryer in the powerful mode.

[0028] 9. An integrated knob may loosen due to radial force on the locking screw, causing the knob to automatically reset and resulting in the cruise control function malfunctioning. In this invention, the knob body and the mounting base are designed as separate units connected by screws. Therefore, the screws in this structure are not subjected to radial force and will not loosen, thus preventing functional failure.

[0029] 10. Due to its good elasticity, after the knob body and the fixing base are fixed together by screws, the wave washer generates an axial force on the fixing base, which not only realizes the self-locking of the speed control knob, thus realizing the constant speed cruise of the hair dryer, but also improves the experience of rotating the speed control knob.

[0030] In summary, this invention uses a purely mechanical structure to achieve cruise control and high-speed mode control. Compared with potentiometer or circuit board speed regulation, this structure has lower replacement costs, simpler electronic control program, and no electrostatic discharge.

[0031] In addition, compared with a separate strong mode start switch and operating component, this structure is lower in cost and simpler in structure; the independent switch requires the operator to continuously press the operating component to maintain the strong mode, while this structure can realize a self-locking strong mode with a reinforced locking component, eliminating the need for continuous manual pressing, reducing user fatigue, and making it easier to use and providing a better experience.

[0032] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0033] The invention will be further described below with reference to the accompanying drawings:

[0034] Figure 1 This is a cross-sectional view of the hair dryer in the embodiment when it is not turned on;

[0035] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0036] Figure 3 This is a schematic diagram showing the position of the knob body of the hair dryer when it is not turned on, as illustrated in the embodiment.

[0037] Figure 4 This is an exploded structural diagram of the start / stop speed control device and the housing in the embodiment;

[0038] Figure 5 This is an exploded view of the start / stop speed control device in the embodiment;

[0039] Figure 6 This is an exploded view of the switch trigger and knob self-locking structure in the embodiment;

[0040] Figure 7 This is an exploded view of the start / stop speed control device in the embodiment;

[0041] Figure 8 This is a schematic diagram of the start / stop speed control device in high-performance mode under scenario 1.

[0042] Figure 9 This is a schematic diagram of the start / stop speed control device in the strong mode under scenario 1.

[0043] Figure 10 This is a schematic diagram showing the position of the knob body in high-performance mode during scenario 2.

[0044] Figure 11 This is a schematic diagram of the start / stop speed control device in high-performance mode under scenario 2.

[0045] Figure 12 This is a schematic diagram showing the position of the knob body in the powerful mode during scenario 2.

[0046] Figure 13 This is a schematic diagram of the start / stop speed control device in the powerful mode under scenario 2.

[0047] Reference numerals: housing 100, handle part 10, shaft hole 101, indicator mark 102, limit support surface 103, start / stop speed control device 1, push-button switch 11, button 111, switch trigger 12, shaft part 121, spring positioning part 122, speed control knob 13, knob body 131, central protrusion 1311, toggle part 1312, anti-rotation groove 1313, fixed seat 132, cam part 1321, support shaft 1322, first support Foot support 1323, second foot support 1324, axial limiting surface 1325, wave washer 133, torsion spring 134, first foot 1341, second foot 1342, screw 135, flat washer 136, strong mode reinforced locking assembly 14, locking button 141, fulcrum 1411, spring mounting protrusion 1412, unlocking operation part 1413, concave surface 1414, fixing pin 142, spring 143, motor 2, fan blade 3. 【Detailed Implementation Methods】

[0048] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0049] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0050] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "front," "rear," "left," and "right" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] Reference Figures 1 to 13As shown, a hair dryer with a constant speed cruise function includes a housing 100, a motor 2 installed inside the housing, a fan blade 3 driven to rotate by the motor, and a start / stop speed control device 1 for controlling the motor. The start / stop speed control device 1 includes a push-button switch 11 and a switch trigger 12. The push-button switch 11 acts as a main switch to start and stop the hair dryer, and also as a signal switch to adjust the speed of the hair dryer. The switch trigger 12 controls the push-button switch 11; pressing the switch trigger activates the push-button switch. The specific structure and principle of the push-button switch 11 and the switch trigger 12 are based on existing technology. The push-button switch 11 has a button 111. When the switch trigger is first pulled, within the initial short stroke, the switch trigger and the button do not interact, and the push-button switch is not activated. Continue pressing the switch trigger. The switch trigger and button are activated, controlling the motor to rotate the fan blades, and the hair dryer starts running. Continue pressing the switch trigger, and the motor speed reaches a higher level, and the hair dryer runs in high-performance mode. Continue pressing the switch trigger to the limit position, and the motor runs at maximum speed, and the hair dryer enters powerful mode. Release the switch trigger, and the switch trigger will automatically reset, and the hair dryer will stop running.

[0054] To achieve constant speed cruise, the start / stop speed control device 1 also includes a speed control knob 13 that drives the switch trigger, a knob self-locking structure that locks the position of the speed control knob 13, and a strong mode reinforcement locking component 14 that cooperates with the knob self-locking structure to limit the position of the speed control knob when the speed control knob 13 is rotated to the maximum angle.

[0055] Rotating the speed control knob rotates the switch trigger, activating the push-button switch to start and stop the hair dryer. Starting from the initial position, rotating the speed control knob actuates the switch trigger, activating the push-button switch and starting the hair dryer. The speed control knob can be adjusted to any position between the hair dryer's initial startup and high-performance mode. Due to the knob's self-locking mechanism, the speed control knob position is locked, correspondingly locking the switch trigger and push-button switch positions, maintaining the hair dryer's current performance and achieving constant speed control. When the speed control knob is in the high-performance mode, a reinforced locking mechanism, working in conjunction with the knob's self-locking mechanism, locks the speed control knob position, achieving high-performance mode lock-in. The hair dryer exits high-performance mode only when the high-performance mode reinforced locking mechanism is unlocked, releasing the speed control knob's reset restriction. This solves the problem of requiring continuous manual pressing of operating components in high-performance mode, which can lead to operator fatigue and a poor user experience.

[0056] In this embodiment, the speed control knob 13 includes a knob body 131 disposed outside the housing and a fixed base 132 disposed inside the housing and connected to the knob body. The knob body drives the fixed base to rotate synchronously. Simultaneously, the fixed base 132 is provided with a switch trigger drive structure for driving the switch trigger actuation. The switch trigger drive structure on the fixed base drives the switch trigger actuation, enabling the speed control knob to drive the switch trigger to perform a toggling action; and locking the fixed base achieves self-locking of the entire speed control knob, facilitating self-locking of the speed control knob. Furthermore, the enhanced locking assembly for the high-performance mode is provided with a radial locking member that radially locks the fixed base. Existing conventional knob self-locking structures achieve self-locking of the speed control knob by applying axial force. In this invention, the enhanced locking assembly for the high-performance mode is provided with a radial locking member that radially locks the fixed base. Thus, when the speed control knob is in the high-performance mode position of the hair dryer, the speed control knob is locked both axially and radially, ensuring the hair dryer's high-performance mode lock-on operation.

[0057] It is understood that the switch trigger drive structure can be a cam portion 1321 located at an eccentric position on the fixed base, or other similar structures. Since the cam portion has a gradually changing cam surface, after the button switch is triggered, rotating the speed control knob drives the switch trigger to rotate at a uniform speed, causing the button switch to be pressed down uniformly. The larger the speed control rotation angle, the stronger the hair dryer's performance, thus allowing adjustment to any position between the hair dryer's initial startup and high-performance state.

[0058] To achieve synchronous rotation between the knob body and the fixed base, the joint between the knob body 131 and the fixed base 132 is provided with a concave-convex fitting structure. Specifically, the fixed base has a circular central groove at its end center, and the knob body has a circular central protrusion 1311 at its end center, which is embedded in the central groove. Furthermore, the bottom wall of the central groove has at least two anti-rotation protrusions along its circumference, and the central protrusion has anti-rotation grooves 1313 along its circumference that engage with the at least two anti-rotation protrusions. With this structure, the knob body and the fixed base can rotate synchronously, and locking the fixed base achieves self-locking of the entire speed control knob.

[0059] To facilitate the rotation of the speed control knob, the knob body is provided with a toggle part 1312. The side of the housing is provided with an indicator mark 102 corresponding to the position of the knob body 131 and the rotation angle range of the knob body 131, which is used to indicate the start / stop of the hair dryer and the speed adjustment. The knob body is provided with a corresponding indicator arrow.

[0060] In this embodiment, the radial locking component includes a locking button 141, a fixing pin 142, and a compression spring 143. The locking button is rotatably mounted on the switch trigger via the fixing pin. A fulcrum portion 1411 is provided at the middle position of the locking button and is rotatably connected to the fixing pin. The compression spring is installed between the first end of the locking button and the switch trigger. A first locking surface is provided between the cam portion and the first end of the locking button, which locks under the action of the compression spring. The first end of the locking button is provided with a second locking surface that locks with the cam portion under the action of the compression spring. Specifically, the first locking surface is a convex surface located radially outward of the cam portion, and the second locking surface is a concave surface 1414 located at the first end of the locking button. This convex surface is the cam curved surface, and the concave surface can be an arc surface. The switch trigger is provided with a compression spring positioning portion 122, and the bottom surface of the first end of the locking button is provided with a compression spring mounting protrusion 1412, which is connected to the upper end of the compression spring. In this way, the cam surface acts on the concave surface, and the compression spring transmits the force to the switch trigger. Therefore, while the speed control knob drives the switch trigger, when the speed control knob is in the high-performance position of the blower, the locking surface of the first end of the locking knob locks with the locking surface on the cam under the action of the compression spring, thereby locking the positions of the speed control knob and the switch trigger.

[0061] Specifically, the switch trigger 12 has rotating shaft portions 121 on its left and right sides, and rotating shaft holes 101 on both sides of the housing. The rotating shaft portions are rotatably supported within the rotating shaft holes. Furthermore, each rotating shaft portion has a pin hole, and the two ends of the fixing pin 142 are rotatably supported within the two pin holes. The locking button 141 is located inside the switch trigger, and the fulcrum portion 1411 is located between the two rotating shaft portions. Since the rotating shaft portions 121 and the fixing pin are coaxial, the speed adjustment knob acts on the locking button, and then on the switch trigger, driving the switch trigger to rotate synchronously.

[0062] To enable the enhanced unlocking of the locking component in the powerful mode, the second end of the locking button 141 is provided with an unlocking operation part 1413. The unlocking operation part is pressed by the operator's finger, and the switch trigger is provided with an operation port corresponding to the operation part. The operation part protrudes from the operation port when the locking button is self-locking. By operating the unlocking operation part, the locking button is unlocked in the powerful mode to enhance the unlocking of the locking component. After the speed control knob is released from its reset limit, the hair dryer exits the powerful mode.

[0063] Furthermore, the robust mode reinforced locking assembly also includes a torsion spring 134, and the fixing base 132 is provided with a support shaft 1322, on which the torsion spring 134 is mounted. Figure 12 and Figure 13 As shown, when the speed control knob is rotated to its maximum angle, the torsion spring 134 drives the fixed base 132 to rotate, and the cam part 1321 applies a force to the locking button 141. This force is opposite to the force of the compression spring. Therefore, it works with the locking button to limit the position of the speed control knob and keep the switch trigger in the corresponding position in the strong mode.

[0064] Specifically, the torsion spring 134 is provided with a first leg 1341 and a second leg 1342. The fixed base 132 is provided with a first leg support portion 1323 interacting with the first leg and a second leg support portion 1324 interacting with the second leg at predetermined angles along the circumference. The strong mode reinforced locking structure also includes a limiting support surface 103 provided on the housing. Within the set rotation angle of the fixed base (this angle is less than the angle from the initial position to the maximum limit position of the speed control knob), the position of the fixed base is restricted by the knob self-locking structure. The first leg always interacts with the first leg support portion 1323, the second leg always interacts with the second leg support portion 1324, and the first leg also gradually moves closer to the limiting support surface 103. When the speed control knob is turned to near its maximum angle, the first foot begins to engage with the limiting support surface and disengages from the first foot support. When the speed control knob is turned to its maximum angle, the limiting support surface applies a reverse rotational force to the speed control knob through a torsion spring. The torsion spring and the compression spring work together to limit the position of the speed control knob, thus achieving a fixed speed in the powerful mode of the hair dryer.

[0065] Furthermore, the speed control knob 13 also includes a screw 135, which moves through the support shaft 1322 and is threadedly connected to the knob body. This fixes the knob body and the mounting base as a single unit. A flat washer 136 is provided between the screw head and the end of the support shaft. The diameter of the flat washer is larger than the diameter of the screw head, the support shaft, and the torsion spring body. The flat washer is used to limit the axial movement of the torsion spring. The other end of the torsion spring is limited by the axial limiting surface 1325 on the mounting base that connects to the root of the support shaft. Due to the separate design of the knob body and the mounting base, the screw in this structure is not subjected to radial force and will not loosen, thus preventing functional failure.

[0066] In this embodiment, the self-locking structure of the knob includes a wave-shaped washer 133 disposed between the fixed base 132 and the housing. The wave-shaped washer is sleeved on the central protrusion 1311, and the wave-shaped washer presses against the fixed base axially. Due to its good elasticity, after the knob body and the fixed base are fixed together by screws, the wave-shaped washer generates an axial force on the fixed base, which not only realizes the self-locking of the speed control knob, thereby realizing constant speed cruise of the hair dryer, but also improves the user experience during the rotation of the speed control knob.

[0067] Understandably, the wave washer can also be replaced by a spring or other elastic component, and the knob self-locking structure can also adopt other structures in the prior art.

[0068] Understandably, similar to existing technology, the housing includes a left housing and a right housing, which are fixed together by screws. A handle 10 is provided on the housing. For ease of operation, the start / stop speed control device 1 is located at the front of the handle.

[0069] Scenario 1: When the switch trigger is pressed, the button switch will not be activated within the initial short travel. Upon continued pressing, the button switch is activated, controlling the motor to rotate the fan blades, and the blower begins to operate. Figure 8 As shown, continue pressing the switch trigger; the motor speed reaches a higher level, and the blower operates in high-performance mode. Figure 9 As shown, continue pressing the switch trigger to its extreme position. The motor will run at maximum speed, and the hair dryer will switch to high-power mode. Releasing the switch trigger will automatically reset it under the action of the torsion spring and the push-button switch, stopping the hair dryer. In scenario 1, the speed control knob remains in a fixed position. Figure 3 The initial position is shown.

[0070] Scenario 2: For example Figures 10 to 13 Starting from the initial position, rotating the speed control knob causes the knob body and the fixed base to rotate synchronously. Pressing the switch trigger rotates the knob, activating the button switch and starting the hair dryer. The speed control knob can be adjusted to any position between the hair dryer's initial startup and high-performance mode. The knob's self-locking mechanism locks the switch trigger, maintaining the hair dryer's current performance and achieving constant speed control. When the speed control knob is in the high-performance mode, continuing to rotate it to its limit position locks the fixed base under the action of the compression and torsion springs, preventing the speed control knob from resetting and achieving high-power mode lock-in. Pressing the unlocking mechanism on the lock knob releases the restriction on the fixed base, and the speed control knob resets to the high-performance position under the action of the torsion spring, disengaging the high-power mode. Continuing to rotate the speed control knob back to the initial position turns off the button switch, stopping the hair dryer.

[0071] This embodiment uses a purely mechanical structure to achieve cruise control and high-speed mode. Compared with potentiometer or circuit board speed control, this structure has lower replacement costs, simpler electronic control program, and no electrostatic discharge.

[0072] In addition, compared with a separate strong mode start switch and operating component, this structure is lower in cost and simpler in structure; the independent switch requires the operator to continuously press the operating component to maintain the strong mode, while this structure can realize a self-locking strong mode with a reinforced locking component, eliminating the need for continuous manual pressing, reducing user fatigue, and making it easier to use and providing a better experience.

[0073] The above description is merely a specific embodiment of the invention, but the scope of protection of the invention is not limited thereto. Those skilled in the art should understand that the invention includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of the invention will be included within the scope of the claims.

Claims

1. A hair dryer with a constant speed cruise function, comprising a housing, a motor installed within the housing, fan blades driven to rotate by the motor, and a speed control device for controlling the start and stop of the motor, wherein the speed control device includes a push-button switch, a switch trigger, a speed control knob, and a knob self-locking structure; the push-button switch controls the start, stop, and speed of the motor; the switch trigger controls the push-button switch; the speed control knob drives the switch trigger; and the knob self-locking structure locks the position of the speed control knob. The hair dryer is characterized in that... The start / stop speed control device also includes a powerful mode reinforced locking component. This component, when the speed control knob is rotated to its maximum angle, engages with the knob's self-locking structure to lock the knob's position, locking it both axially and radially. The speed control knob includes a knob body located outside the housing and a fixed base located inside the housing and connected to the knob body. The knob body drives the fixed base to rotate synchronously. The fixed base has a switch trigger drive structure that actuates the switch trigger. The powerful mode reinforced locking component has a radial locking element that radially locks the fixed base. The switch trigger drive structure is a cam portion located at an eccentric position on the fixed base. A first locking surface is provided between the wheel and the radial locking member. The radial locking member includes a locking button, a fixing pin, and a compression spring. The locking button is rotatably mounted on the switch trigger via the fixing pin. The compression spring is installed between the first end of the locking button and the switch trigger. The first end of the locking button has a second locking surface that engages with the cam under the action of the compression spring. The second end of the locking button has an unlocking operation part. The locking button is unlocked by operating the unlocking operation part. The fixed base has a support shaft. The strong mode reinforced locking assembly includes a torsion spring mounted on the support shaft. When the speed control knob is rotated to its maximum angle, the torsion spring drives the cam to engage with the radial locking member to lock the position of the speed control knob.

2. A hair dryer with constant speed cruise function according to claim 1, characterized in that, The first locking surface is a convex surface located radially outward of the cam portion, and the second locking surface is a concave surface located at the first end of the locking button; and / or, the joint between the knob body and the fixing seat is provided with a concave-convex fitting structure.

3. A hair dryer with constant speed cruise function according to claim 1, characterized in that, The switch trigger has a rotating shaft on its left and right sides, and the housing has a rotating shaft hole. The rotating shaft is rotatably supported in the rotating shaft hole. The rotating shaft has a pin hole, and the two ends of the fixing pin are rotatably supported in the pin hole.

4. A hair dryer with constant speed cruise function according to claim 1, characterized in that, The torsion spring has a first leg and a second leg. The fixed base has a first leg support part that acts on the first leg and a second leg support part that acts on the second leg at set angles along the circumference. The housing has a limiting support surface on the radially outer side of the fixed base. Within the set rotation angle of the fixed base, the position of the fixed base is restricted by the knob self-locking structure. When the speed control knob is rotated to near the maximum angle, the first leg begins to act with the limiting support surface. When the speed control knob is rotated to the maximum angle, the torsion spring and the compression spring act simultaneously to restrict the position of the speed control knob.

5. A hair dryer with constant speed cruise function according to claim 1, characterized in that, The knob self-locking structure includes a wave-shaped washer disposed between the fixed base and the housing. The knob body has a central protrusion at the center of its end that connects with the fixed base. The wave-shaped washer is sleeved on the central protrusion, and the wave-shaped washer presses the fixed base axially.

6. A hair dryer with constant speed cruise function according to claim 1, characterized in that, The speed control knob also includes a screw that moves through a mounting base and is threadedly connected to the knob body.

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