A hand-held blower

Abstract

The application relates to a handheld blower, which comprises a main machine, a fan system and a control module are arranged in the main machine, the fan system can be controlled by the control module to rotate forward or reversely to realize blowing or air suction functions, and the handheld blower is characterized in that the handheld blower further comprises a wind tube detection device and a wind tube; the wind tube detection device is arranged at a wind tube mounting port of the main machine; the wind tube detection device is electrically connected with the control module; the wind tube detection device identifies a signal when the wind tube is mounted at the wind tube mounting port of the main machine; the control module controls the fan system to blow air to the wind tube; and the wind tube detection device has no signal identification when the wind tube is not mounted at the wind tube mounting port of the main machine, and the control module controls the fan system to suck air in the reverse direction. The switching is realized by adopting a mutual exclusion mode based on Boolean logic, thus fundamentally eliminating misoperation and improving use safety.

Description

Technical Field

[0001] This invention relates to the field of ducted fan technology, and more particularly to a handheld blower. Background Technology

[0002] Currently, cordless handheld blowers and vacuums are widely used in many households as efficient and convenient garden cleaning and home cleaning tools. These tools mainly use a built-in motor to drive the fan blades in both forward and reverse directions, thereby switching between blowing and suction modes. The blowing mode is suitable for blowing away fallen leaves, dust, and other debris from the target area, while the suction mode usually requires the use of a dust bag or dust box to suck up and collect debris.

[0003] It is worth noting that to achieve the switching between these two functions, existing products generally have a manually operated forward / reverse switch on the device, allowing users to manually select the blowing or suction mode according to the actual usage scenario. However, this control method, which relies on user subjective judgment and manual operation, has significant inherent defects and usage risks: In actual operation, users often make misjudgments or oversights. For example, when intending to use the blowing function, they may forget to switch to the corresponding blowing setting. If the device is still in suction mode at this time, its powerful suction will accidentally suck the target object (such as small gardening tools, flowers, valuables, etc.) into the machine, which can easily damage these objects. It may also cause jamming or mechanical damage to key components such as the impeller and motor inside the blower, seriously affecting the product's lifespan and safety. In addition, even if no substantial damage is caused, frequent manual switching operations reduce the convenience and efficiency of use and disrupt the smoothness of continuous operation.

[0004] Therefore, the existing manual switch control mode has significant shortcomings in terms of user experience, safety, and equipment reliability. There is an urgent need for a solution that can intelligently identify the user's intention and automatically switch the working mode in order to fundamentally avoid a series of problems caused by human error. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a handheld blower that adopts a mutual exclusion mode switching based on Boolean logic, thereby fundamentally eliminating misoperation and improving the safety of use.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A handheld blower includes a main unit with a fan system and a control module. The fan system can be controlled by the control module to rotate forward or backward to achieve blowing or suction functions. The blower is characterized by further including a duct detection device and a duct. The duct detection device is located at the duct mounting port of the main unit and is electrically connected to the control module. When the duct is installed at the duct mounting port of the main unit, the duct detection device recognizes a signal, and the control module controls the fan system to blow air towards the duct. When the duct is not installed at the duct mounting port of the main unit, the duct detection device does not recognize a signal, and the control module controls the fan system to suction air in the opposite direction.

[0008] Its most significant benefit lies in achieving intelligent and automated operation. The duct detection device automatically identifies the operating condition (duct installed or not), and the control module automatically switches the fan system's airflow direction accordingly, completely eliminating the risk of misoperation due to users forgetting to manually switch the forward / reverse switch. This not only greatly improves the safety and reliability of the equipment, preventing accidental ingestion and damage to target objects, but also simplifies the user's operating process, enhances the user experience, and makes the tool more intuitive and convenient to use, fundamentally eliminating misoperation and improving safety.

[0009] Preferably, the duct testing device includes a micro switch, which is located around the duct mounting opening of the main unit. When the duct is installed, the duct presses the trigger of the micro switch. Using a micro switch as the testing device is advantageous due to its mature technology, low cost, simple structure, and reliable signal triggering. The physical touch control method of the micro switch has strong anti-interference capabilities and is not easily affected by dust, moisture, or electromagnetic interference in the environment, making it very suitable for use in tools such as blowers that may operate in harsh environments, ensuring the stability and durability of the entire testing system.

[0010] Preferably, the duct detection device includes a Hall sensor, which is positioned around the duct mounting opening at the main unit's outlet. A corresponding inductive magnet is located on the duct. When the duct is installed, the inductive magnet aligns with the Hall sensor, which detects the change in the magnetic field and outputs a signal. The core advantage of using a Hall sensor is that it achieves non-contact detection. Since there is no physical contact between the sensor and the magnet on the duct, there is no mechanical wear, significantly extending its service life. Simultaneously, this solution offers excellent sealing, making it ideal for operation in dusty environments and ensuring high reliability. Furthermore, this magnetic induction method makes the installation and removal of the duct smoother, improving the user experience.

[0011] Preferably, the air duct includes a first magnet, a second magnet, and a third magnet. The main unit has first, second, and third magnetic attraction points on the periphery of the air duct mounting port, and the air duct is magnetically mounted on the air duct mounting port of the main unit. This claim, based on automatic detection, further introduces a multi-point magnet magnetic mounting structure, achieving rapid, accurate, and aligned installation between the air duct and the main unit. Multiple magnetic attraction points ensure that the air duct is automatically positioned correctly in the circumferential direction, thereby guaranteeing that the magnets (for Hall sensor solutions) or structures on the air duct can accurately trigger the detection device on the main unit, improving the success rate and accuracy of automatic identification. Simultaneously, the magnetic connection method is simpler and faster than traditional threaded or snap-fit ​​connections, providing a superior user experience.

[0012] Preferably, a trigger switch is located on the handle of the main unit, and the trigger switch is electrically connected to the control module. The trigger switch, located on the handle, is ergonomically designed so that the user's fingers can naturally reach and control the switch when holding the unit with one hand, enabling one-handed operation. This design improves the convenience and flexibility of operation. Furthermore, the trigger is a linear trigger, providing more precise control of the fan speed, making it particularly suitable for users who need to frequently control the fan speed or operate the unit while moving, thus enhancing the human-computer interaction capabilities of the blower.

[0013] Preferably, the fan system includes fan blades, a duct housing, a head cone, and a drive motor. The duct housing is a hollow cylinder with two open ends. One end of the duct housing has an air inlet lip, and the center of the duct housing has a guide vane. A motor mounting part is located in the middle of the guide vane, and the drive motor housing is fixed to the motor mounting part. The fan blades are fixed to the output shaft of the drive motor, and the head cone is fixed to the base of the fan blades, with the tip of the head cone facing the air inlet lip. This design uses a 9-blade fan, providing a large working area. The blade airfoils are NACA6306 and NACA6309. The NACA6306 blade tip and ultra-thin trailing edge greatly reduce aerodynamic drag, while the NACA6309 blade root provides excellent structural strength. Such a ducted fan is more energy-efficient, has a longer range, and can even achieve the same thrust with a smaller motor, generating far more thrust than fans of similar size at lower speeds.

[0014] Preferably, a locking device is also included, comprising a central shaft, a clamping head, and a nut. One end of the central shaft has a tapered locking head, and the other end has a thread. The tapered locking head has a multi-lobed jaw structure, and one end of the clamping head is a concave tapered shape. The central shaft is mounted on the output shaft of the drive motor, and the clamping head is mounted on the central shaft. The concave end of the clamping head engages with the tapered locking head, causing the four tapered locking heads to mesh on the output shaft of the drive motor. The fan blade is mounted on the central shaft and engages with the clamping head. The nut, through its thread, pushes the fan blade and the clamping head backward, fixing the locking head to the output shaft of the drive motor. This design maintains a 0.2-0.3mm clearance between the blade tip and the inner wall of the duct housing, placing high demands on the concentricity of the fan blade and the motor output shaft. Through the physical principles of "keyless, self-expanding, and full-circumferential contact," all radial clearances are actively eliminated, achieving perfect alignment and improving the stability of the ducted fan system.

[0015] Preferably, the main unit includes a fan shroud and a ductwork. A fan system is installed at one end of the ductwork, and a fan housing is installed at the other end. A limiting groove is provided at the end of the ductwork where the fan system is installed, and a limiting hook is provided on the duct housing. The limiting hook is installed in the limiting groove, and the fan shroud presses the fan system against the ductwork. Through the cooperation of the limiting hook and the limiting groove, rapid and precise circumferential and axial positioning of the fan system within the ductwork is achieved. This structure ensures the consistency of the fan component assembly, avoids assembly errors, and the pressing and fixing method of the fan shroud makes the installation and disassembly of the entire fan system very simple, requiring no complex tools, facilitating production assembly and after-sales maintenance, and reducing manufacturing and repair costs.

[0016] Preferably, an emergency switch is also included, which is installed on the main unit and electrically connected to the control module. The inclusion of a separate emergency switch is an important safety redundancy design. Its advantage lies in providing users with a highest-priority, direct physical means of cutting off power in the event of a main control circuit failure or an emergency (such as a foreign object jamming the fan blades and normal operation being ineffective), greatly enhancing the overall safety of the product.

[0017] Preferably, when the control module detects a change in the installation status of the fan duct, it first stops the motor, then starts the motor and controls its rotation based on the new status signal. The defined control logic for state switching has the advantage of protecting the motor and transmission system. By stopping the motor before switching the fan duct, and ensuring the motor cannot be controlled by pressing the trigger until the fan blades have completely stopped, it avoids the huge current surge and mechanical stress on the motor caused by sudden changes in direction at high speed. This effectively extends the lifespan of the motor and electronic control components, and improves the stability and reliability of the system.

[0018] In summary, this handheld blower uses a Boolean logic-based mutual exclusion mode switching, which fundamentally eliminates accidental operation and improves safety. Attached Figure Description

[0019] The invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is an assembly diagram of the described embodiment;

[0021] Figure 2 This is a structural diagram of the connection surface of the host in the first embodiment of the described implementation method;

[0022] Figure 3 This is a structural diagram of the air duct connection surface in the first embodiment of the described implementation method;

[0023] Figure 4 This is a structural diagram of the connection surface of the host in the second embodiment of the described implementation.

[0024] Figure 5 This is a structural diagram of the air duct connection surface in the second embodiment of the described implementation method;

[0025] Figure 6 This is a schematic diagram of the air intake system installed on the main unit in the embodiment described above;

[0026] Figure 7 This is a schematic diagram of the air intake system assembly structure in the embodiment described above;

[0027] Figure 8 This is a schematic diagram of the internal structure of the duct housing in the described embodiment;

[0028] Figure 9 This is an exploded view of the locking structure in the embodiment described above;

[0029] Among them, the main unit-1, first magnetic attraction point-11, second magnetic attraction point-12, third magnetic attraction point-13, trigger switch-14, fan cover-15, air collection pipe-16, limit groove-17, emergency switch-18, air duct mounting port-19, fan system-2, fan blade-21, duct shell-22, limit hook-221, head cone-23, drive motor-24, air inlet lip-25, air guide grid-26, locking device-27, central shaft-271, clamping head-272, nut-273, conical locking head-274, motor fixing part-28, air duct detection device-3, micro switch-31, Hall sensor-32, air duct-4, induction magnet-41, first magnet-42, second magnet-43, third magnet-44. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] A handheld blower includes a main unit 1, a fan system 2 and a control module. The fan system 2 can be controlled by the control module to rotate forward or backward to achieve blowing or suction functions. The blower is characterized by further including a blower 4 detection device 3 and a blower 4. The blower 4 detection device 3 is located at the blower mounting port 19 of the main unit 1 and is electrically connected to the control module. When the blower 4 is installed at the blower mounting port 19 of the main unit 1, the blower 4 detection device 3 detects a signal, and the control module controls the fan system 2 to blow air towards the blower 4. When the blower 4 is not installed at the blower mounting port 19 of the main unit 1, the blower 4 detection device 3 does not detect a signal, and the control module controls the fan system 2 to suction air in the opposite direction.

[0032] Its most significant benefit lies in achieving intelligent and automated operation. The detection device 3 automatically identifies the operating condition (whether the air duct 4 is installed or not), and the control module automatically switches the airflow direction of the fan system 2 accordingly, completely eliminating the risk of misoperation caused by users forgetting to manually switch the forward / reverse switch. This not only greatly improves the safety and reliability of the equipment, preventing accidental ingestion and damage to target objects, but also simplifies the user's operating process, enhances the user experience, and makes the tool more intuitive and convenient to use, fundamentally eliminating misoperation and improving safety.

[0033] As a first embodiment of this implementation, please refer to the appendix. Figure 2 and appendix Figure 3 The detection device 3 for the air duct 4 includes a micro switch 31, which is located around the air duct mounting port 19 of the main unit 1. When the air duct 4 is installed, the air duct 4 presses the trigger part of the micro switch 31. The use of the micro switch 31 as the detection device is due to its mature technology, low cost, simple structure, and clear and reliable signal triggering. The physical touch control method of the micro switch 31 has strong anti-interference capabilities and is not easily affected by dust, moisture, or electromagnetic interference in the environment, making it very suitable for use in tools such as blowers that may be in harsh working environments, ensuring the stability and durability of the entire detection system.

[0034] As the first and second embodiments of this implementation, please refer to the appendix. Figure 4 and appendix Figure 5The detection device 3 for the air duct 4 includes a Hall sensor 32, which is located around the air duct mounting port 19 of the main unit 1. A corresponding induction magnet 41 is provided on the air duct 4. When the air duct 4 is installed, the induction magnet 41 faces the Hall sensor 32, and the Hall sensor 32 detects the change in magnetic field and outputs a signal. The core advantage of using the Hall sensor 32 is that it achieves non-contact detection. Since there is no physical contact between the sensor and the magnet on the air duct 4, there is no mechanical wear problem, greatly extending the service life. At the same time, this solution has good sealing performance, making it very suitable for operation in dusty environments and ensuring high reliability. Furthermore, this magnetic induction method makes the installation and removal of the air duct 4 smoother, improving the user experience.

[0035] Preferably, the air duct 4 includes a first magnet 42, a second magnet 43, and a third magnet 44. The main unit 1 has a first magnetic attraction point 11, a second magnetic attraction point 12, and a third magnetic attraction point 13 on the periphery of the air duct mounting port 19, and the air duct 4 is magnetically mounted on the air duct mounting port 19 of the main unit 1. Based on automatic detection, this claim further introduces a multi-point magnet magnetic mounting structure, achieving rapid, accurate, and aligned installation between the air duct 4 and the main unit 1. Multiple magnetic attraction points ensure that the air duct 4 is automatically positioned correctly in the circumferential direction, thereby ensuring that the magnets (for the Hall sensor 32 scheme) or structures on the air duct 4 can accurately trigger the detection device on the main unit 1, improving the success rate and accuracy of automatic identification. At the same time, the magnetic connection method is simpler and faster than traditional threaded or snap-fit ​​connections, providing a better user experience.

[0036] Preferably, a trigger switch 14 is provided on the handle of the main unit 1, and the trigger switch 14 is electrically connected to the control module. The trigger switch 14 located on the handle is ergonomically designed, allowing the user to naturally reach and control the switch with their fingers when holding the unit with one hand, thus enabling one-handed operation. This design improves the convenience and flexibility of operation, and the trigger is a linear trigger, which allows for more precise control of the fan speed. It is especially suitable for users who need to frequently control the fan speed or operate the unit while moving, thus improving the human-computer interaction capability of the blower.

[0037] Preferably, the fan system 2 includes fan blades 21, a duct housing 22, a head cone 23, and a drive motor 24. The duct housing 22 is a hollow cylinder with two straight ends. One end of the duct housing 22 has an air inlet lip 25, and the center of the duct housing 22 has a guide grille 26. The center of the guide grille 26 has a motor mounting part 28. The housing of the drive motor 24 is fixed to the motor mounting part 28. The fan blades 21 are fixed to the output shaft of the drive motor 24, and the head cone 23 is fixed to the base of the fan blades 21, with the tip of the head cone 23 facing the air inlet lip 25. This design uses a 9-blade fan blade 21, which provides a large working area. The airfoil of the fan blades 21 is selected from NACA6306 and NACA6309. The tip and ultra-thin trailing edge of NACA6306 greatly reduce aerodynamic drag, while the root of NACA6309 provides excellent structural strength. Such ducted fans are more energy-efficient, have a longer battery life, and can even achieve the same thrust with a smaller motor, producing far more thrust than fans of similar size at lower speeds.

[0038] Additionally, please refer to the appendix. Figure 9 It also includes a locking device 27, which includes a central shaft 271, a clamping head 272, and a nut 273. One end of the central shaft 271 is provided with a conical locking head 274 and the other end is provided with a thread. The conical locking head 274 is a multi-lobed claw structure. One end of the clamping head 272 is concave conical. The central shaft 271 is mounted on the output shaft of the drive motor 24. The clamping head 272 is mounted on the central shaft 271. The concave end of the clamping head 272 fits against the conical locking head 274 so that the four conical locking heads 274 are engaged on the output shaft of the drive motor 24. The fan blade 21 is mounted on the central shaft 271 and fits against the clamping head 272. The nut 273 pushes the fan blade 21 and the clamping head 272 backward through the thread, so that the locking head is fixed on the output shaft of the drive motor 24. This design maintains a 0.2-0.3mm gap between the blade tip and the inner wall of the duct housing 22, which places high demands on the concentricity of the fan blade 21 and the motor output shaft. Through the physical principle of "keyless, self-expanding, and full-circumference contact", all radial fit gaps are actively eliminated, achieving perfect alignment and improving the stability of the ducted fan system.

[0039] Further, see attached document. Figure 6The main unit 1 includes a fan shroud 15 and a duct 16. A fan system 2 is installed at one end of the duct 16, and a fan casing 4 is installed at the other end. A limiting groove 17 is provided at the end of the duct 16 where the fan system 2 is installed. A limiting hook 221 is provided on the duct housing 22, and the limiting hook 221 is installed in the limiting groove 17. The fan shroud 15 presses against the fan system 2 and fixes it to the duct 16. Through the cooperation of the limiting hook 221 and the limiting groove 17, the fan system 2 is quickly and accurately positioned circumferentially and axially within the duct 16. This structure ensures the consistency of the fan component assembly, avoids assembly errors, and the pressing and fixing method of the fan shroud 15 makes the installation and disassembly of the entire fan system 2 very simple, requiring no complex tools, facilitating production assembly and after-sales maintenance, and reducing manufacturing and maintenance costs.

[0040] Preferably, an emergency switch 18 is also included. The emergency switch 18 is mounted on the main unit 1 and is electrically connected to the control module. The independent emergency switch 18 is an important safety redundancy design. Its advantage lies in providing users with a highest-priority physical means to directly cut off power in the event of a main control circuit failure or an emergency (such as a foreign object jamming the fan blade 21 and normal operation being ineffective), greatly enhancing the overall safety of the product.

[0041] Preferably, when the control module detects a change in the installation status of the air duct 4, it first stops the motor, then starts the motor and controls its rotation based on the new status signal. The defined control logic for state switching has the advantage of protecting the motor and transmission system. By stopping the motor before switching the air duct 4, and ensuring the motor cannot be controlled by pressing the trigger before the fan blades 21 have completely stopped, it avoids the huge current surge and mechanical stress on the motor caused by sudden changes in direction at high speed. This effectively extends the lifespan of the motor and electronic control components, and improves the stability and reliability of the system.

[0042] In summary, this handheld blower uses a Boolean logic-based mutual exclusion mode switching, which fundamentally eliminates accidental operation and improves safety.

[0043] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A handheld blower, comprising a main unit, wherein the main unit is equipped with a fan system and a control module, the fan system being controllable by the control module to rotate forward or reverse to achieve blowing or suction functions, characterized in that: It also includes a duct detection device and a duct. The duct detection device is installed at the duct mounting port of the main unit and is electrically connected to the control module. When the duct is installed at the duct mounting port of the main unit, the duct detection device recognizes a signal, and the control module controls the fan system to blow air in the direction of the duct. When the duct is not installed at the duct mounting port of the main unit, the duct detection device does not recognize a signal, and the control module controls the fan system to draw air in the opposite direction.

2. The handheld blower according to claim 1, characterized in that: The duct detection device includes a micro switch, which is located around the duct mounting port of the main unit. When the duct is installed, the duct presses the trigger part of the micro switch.

3. The handheld blower according to claim 1, characterized in that: The duct detection device includes a Hall sensor, which is located around the duct installation port of the main unit. The duct is equipped with a corresponding induction magnet. When the duct is installed, the induction magnet is opposite to the Hall sensor, and the Hall sensor detects the change in magnetic field and outputs a signal.

4. The handheld blower according to claim 2 or 3, characterized in that: The air duct includes a first magnet, a second magnet, and a third magnet. The main unit has a first magnetic attraction point, a second magnetic attraction point, and a third magnetic attraction point around the air duct mounting port. The air duct is magnetically mounted on the air duct mounting port of the main unit.

5. The handheld blower according to claim 4, characterized in that: The main unit has a trigger switch on its handle, and the trigger switch is electrically connected to the control module.

6. The handheld blower according to claim 5, characterized in that: The fan system includes fan blades, a duct housing, a head cone, and a drive motor. The duct housing is a hollow cylinder with two straight ends. One end of the duct housing has an air inlet lip. The center of the duct housing has a flow guide grille. The middle of the flow guide grille has a motor mounting part. The housing of the drive motor is fixed to the motor mounting part. The fan blades are fixed to the output shaft of the drive motor. The head cone is fixed to the base of the fan blades, and the tip of the head cone faces the air inlet lip.

7. The handheld blower according to claim 6, characterized in that: It also includes a locking device, which comprises a central shaft, a clamping head, and a nut. One end of the central shaft is provided with a tapered locking head and the other end is provided with a thread. The tapered locking head is a multi-lobed claw structure. One end of the clamping head is concave tapered. The central shaft is mounted on the output shaft of the drive motor. The clamping head is mounted on the central shaft. The concave end of the clamping head fits against the tapered locking head, so that the four tapered locking heads are engaged on the output shaft of the drive motor. The fan blade is mounted on the central shaft and fits against the clamping head. The nut pushes the fan blade and the clamping head backward through the thread, so that the locking head is fixed on the output shaft of the drive motor.

8. The handheld blower according to claim 6, characterized in that: The main unit includes a fan cover and a collection duct. A fan system is installed at one end of the collection duct and a fan tube is installed at the other end. A limiting groove is provided at the end of the collection duct where the fan system is installed. A limiting hook is provided on the outer shell of the duct. The limiting hook is installed in the limiting groove. The fan cover presses against the fan system and is fixed on the collection duct.

9. The handheld blower according to claim 6, characterized in that: It also includes an emergency switch, which is installed on the host and is electrically connected to the control module.

10. The handheld blower according to claim 6, characterized in that: When the control module detects a change in the installation status of the wind tunnel, it first controls the motor to stop running, and then starts the motor and controls its rotation according to the new status signal.

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