Dust collector air duct assembly with tensegrity electromagnetic levitation flow guide and method

Abstract

The application discloses a dust collector air duct assembly and method with a tension integral electromagnetic suspension flow guide core, and relates to the technical field of dust collector air duct adaptive flow guide. A flow guide core composed of a three-pole nine-cable tension integral structure is arranged inside the air duct, and a contactless magnetic suspension control system is formed by combining a pipe wall electromagnetic coil and a core embedded permanent magnet array. An axial ellipsoid stretching transformation forms a spindle-shaped rotary envelope, an outer wall spiral flow guide cable realizes airflow pre-rotation, and a hollow cable net forms an inner and outer double channel. The air duct is divided into an inlet acceleration section, a suspension working section and an outlet diffuser section along the airflow. A ring-shaped offset permanent magnet is used to reduce suspension power consumption, and front and rear limiting bosses are used in cooperation with a buffer pad to realize power-off safe return. The application has fewer structural components, higher lightweight degree and simple assembly, and has the advantages of noise reduction, energy saving, high dust and gas separation efficiency, and adaptation to handheld and horizontal full-category dust collectors.

Description

Technical Field

[0001] This invention relates to the field of vacuum cleaner technology, specifically to a vacuum cleaner duct assembly and method with a tensioned integral electromagnetic levitation guide core, which is suitable for cleaning in various scenarios such as home, kitchen, vehicle, and office, and is especially suitable for scenarios with high requirements for cleaning precision and no secondary pollution, belonging to the field of high-precision cleaning equipment technology. Background Technology

[0002] The air duct of a vacuum cleaner directly determines the overall suction power utilization, dust separation efficiency, and operating noise. Traditional air ducts use a fixed, uniform diameter structure. Under different conditions such as carpets, floors, and when the nozzle is off the ground, the airflow velocity and negative pressure vary significantly, making it impossible to adaptively adjust the flow cross-section. This results in wasted suction power, poor separation effect, and increased noise. Existing improved designs use solid floating guide components, which are relatively heavy and rely on springs and airflow pressure differences for passive movement. This leads to defects such as mechanical friction, spring aging, slow response, concentrated force, and weak impact resistance. Current vacuum cleaner technology improvements mostly focus on surface optimizations such as motors, filters, and materials, without revolutionizing the core structure and working mechanism of the air duct, failing to fundamentally solve the inherent defects of a single negative pressure mode. Traditional adjustable guide structures often use solid cores with mechanical supports, resulting in problems such as heavy weight, friction and wear, slow response, and easy aging and failure. Meanwhile, existing tensioned integral airflow guiding structures are mostly complex configurations with multiple rods and cables, resulting in redundant components, complex assembly, and strong magnetic coupling, making them difficult to adapt to the lightweight and high-precision control requirements of vacuum cleaners with their narrow airflow ducts. Therefore, developing vacuum cleaner airflow duct components with tensioned integral electromagnetic levitation airflow guiding cores, and vacuum cleaner airflow duct components that are lightweight, low-loss, low-noise, and adaptable to all scenarios, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a vacuum cleaner duct assembly and method with a tensioned integral electromagnetic levitation guide core. The guide core, constructed by a tensioned integral structure of three rods and nine cables, is arranged inside the duct. This, combined with an electromagnetic coil on the duct wall and an embedded permanent magnet array within the core, forms a contactless magnetic levitation control system. An axial ellipsoidal stretching transformation creates a spindle-shaped rotating outer envelope, while the spiral guide cables on the outer wall achieve airflow pre-swirl. A perforated cable net forms inner and outer dual channels. The duct is divided into three functional sections along the airflow: an inlet acceleration section, a levitation working section, and an outlet diffusion section. A ring-shaped bias permanent magnet reduces levitation power consumption, and front and rear limiting bosses, along with buffer pads, ensure safe return in the event of power failure. To achieve the above objectives, this invention provides the following technical solution: A vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core includes: an air duct, a tensioned integral guide core, and a magnetic levitation electromagnetic actuator. The tensioned integral guide core is disposed within the inner cavity of the air duct and coaxially arranged with the air duct wall. The tensioned integral guide core is a three-bar, nine-cable tensioned integral self-balancing spatial mesh structure, formed by combining rigid compression members and flexible tension members. Its outer envelope has a streamlined rotating shape, forming an annular airflow channel with the inner surface of the air duct wall. A permanent magnet array is fixedly disposed on the rigid compression member. The magnetic levitation electromagnetic actuator is embedded in the air duct wall and, in conjunction with the permanent magnet array, generates a controllable electromagnetic force to achieve contactless levitation of the tensioned integral guide core.

[0004] Furthermore, the duct wall is sequentially provided with an inlet acceleration section, a suspension working section, and an outlet diffuser section along the airflow direction; the inner diameter of the inlet acceleration section narrows along the airflow direction, forming a Venturi neck with the front end of the tensioned integral guide core; the inner diameter of the suspension working section is constant, used to install the magnetic levitation electromagnetic actuator control element; the inner diameter of the outlet diffuser section expands along the airflow direction, realizing the recovery of dynamic pressure to static pressure energy.

[0005] Furthermore, the control system automatically adjusts the axial position of the tensioned integral guide core according to the dust collection conditions; under high-resistance carpet conditions, the tensioned integral guide core is moved backward to expand the cross-sectional area of ​​the inlet acceleration section and narrow the cross-sectional area of ​​the outlet diffusion section; under low-resistance hard floor conditions, the tensioned integral guide core is moved forward to reduce the cross-sectional area of ​​the inlet acceleration section and expand the cross-sectional area of ​​the outlet diffusion section.

[0006] Furthermore, the air duct wall is equipped with a front limiting boss and a rear limiting boss. The front limiting boss and the rear limiting boss only dock with the spatial nodes of the tensioned integral guide core. The contact surface is covered with an elastic buffer pad. When the vacuum cleaner is powered off, the control system smoothly reduces the output current of the magnetic levitation electromagnetic actuator, and the tensioned integral guide core slowly falls to the front limiting boss and the rear limiting boss.

[0007] Furthermore, the tensioned integral flow guide core is formed by axial ellipsoidal stretching transformation based on a triangular prism topology, comprising 3 non-contact rigid pressure bars, 9 prestressed flexible cables, and 6 spatial nodes. All flexible cables are continuously pre-tensioned to maintain the overall self-balancing configuration. The 3 rigid pressure bars are evenly and staggeredly arranged along the circumference of the core, with one end of each rigid pressure bar close to the spatial node on the air intake side and the other end extending to the equatorial region of the core. The 3 rigid pressure bars do not cross contact in space. The permanent magnet array consists of 3 permanent magnets, which are embedded one-to-one in the equatorial middle section of the 3 rigid pressure bars. The three permanent magnets are arranged coplanarly on the equatorial plane of the maximum diameter of the core, circumferentially spaced at 120°, with the magnetic poles perpendicular to the axis of the rigid pressure bars and pointing radially outward to the duct wall.

[0008] Furthermore, the nine flexible cables are divided into six circumferential tension cables and three diagonal torsion cables; the circumferential cables constrain the contours at both ends of the core and control the axial stiffness, while the diagonal torsion cables enhance the structure's torsional resistance; the six spatial nodes are divided into three on the air inlet side and three on the air outlet side, with each spatial node simultaneously connecting one rigid pressure bar end and three flexible cable ends, and the spatial node being the only contact point for limiting movement.

[0009] Furthermore, the outer surface of the flexible cable network is wrapped with a continuous spiral guide cable, which is an additional tension cable used to induce airflow to generate pre-swirling flow; the outer side of the flexible cable network is covered with a microporous breathable flexible film to form an internal and external dual-channel airflow structure.

[0010] Furthermore, the duct wall is embedded with a bias permanent magnet to provide basic radial centripetal force, reducing the continuous power consumption of the magnetic levitation electromagnetic actuator. The magnetic levitation electromagnetic actuator includes a radial electromagnetic coil and an axial electromagnetic coil. A controllable axial Halbach array is disposed at the air inlet and outlet ends of the duct wall, including a coaxially nested Halbach outer ring stator and a Halbach inner ring rotor. The Halbach outer ring stator and the Halbach inner ring rotor are each composed of multiple Halbach permanent magnet blocks arranged circumferentially. The magnetization direction of adjacent Halbach permanent magnet blocks rotates 90° sequentially within the ring plane, causing the controllable axial Halbach array to generate an axial unilateral magnetic field. The Halbach inner ring rotor can rotate relative to the Halbach outer ring stator. By changing the relative rotation angle between the Halbach inner ring rotor and the Halbach outer ring stator, the direction and magnitude of the axial magnetic force can be infinitely adjusted between forward and backward. The axial electromagnetic coils are respectively located at the air inlet and air outlet of the air duct. There are a total of 4 sets of radial electromagnetic coils, which are arranged in a ring array around the circumference of the air duct wall. The displacement sensor array includes axial displacement sensors and radial displacement sensors. The axial sensors are located at both ends of the air duct. There are 3 radial sensors, which are arranged alternately between the radial electromagnetic coils. The radial electromagnetic coils, axial electromagnetic coils, and displacement sensors are sealed and encapsulated inside the air duct wall, completely isolated from the dust-laden airflow.

[0011] Furthermore, a vacuuming method for a vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core includes the following steps: Step S1: Power-on levitation initialization: After the vacuum cleaner is powered on, the control system prioritizes outputting drive current to the magnetic levitation electromagnetic actuator, which, together with the bias permanent magnet built into the air duct wall, provides basic levitation magnetic force; the radial electromagnetic coil and the axial electromagnetic coil work together to generate controllable electromagnetic force, which, combined with the real-time position feedback closed-loop adjustment of the displacement sensor, enables the tensioned integral guide core to establish stable contactless levitation, and the vacuum motor is started after the levitation calibration is completed. Step S2: Adaptive Airflow Control: During normal vacuuming, the control system collects real-time signals of motor speed and negative pressure in the duct cavity, and simultaneously reads the position and attitude data of the tensioned integral guide core detected by radial and axial displacement sensors. Under high-resistance carpet conditions, the axial electromagnetic coil is adjusted to drive the tensioned integral guide core to move backward, expanding the annular flow cross-sectional area of ​​the duct inlet acceleration section and narrowing the flow cross-sectional area of ​​the outlet diffusion section. Under low-resistance hard floor conditions, the tensioned integral guide core is driven to move forward, reducing the cross-sectional area of ​​the inlet acceleration section and expanding the cross-sectional area of ​​the outlet diffusion section to achieve dynamic pressure recovery and noise reduction. Step S3: Airflow Buffering and Noise Reduction Guiding: After the dust-laden airflow is pre-accelerated through the inlet acceleration section of the air duct, it enters the suspension working section. The spiral guide cable on the outside of the tensioned integral guide core induces the airflow to generate a pre-swirling flow. The flexible cable mesh forms an inner and outer dual channel for uniform flow distribution. When the airflow impact causes instantaneous disturbance, the flexible cable network of the tensioned integral guide core passively buffers the flow through tension redistribution. The control system synchronously outputs the electromagnetic active damping of the magnetic levitation electromagnetic actuator to suppress the vibration and displacement of the tensioned integral guide core. Step S4: Power failure and fall protection: After the vacuum cleaner is powered off, the control system controls the current of the magnetic levitation electromagnetic actuator to decrease smoothly and linearly. The tensioned integral guide core slowly descends under its own weight, and the smooth limit is completed by only relying on the elastic buffer pads of the front limit boss and the rear limit boss of the spatial node. The flexible cable is not subject to impact load throughout the process.

[0012] Compared with the prior art, the present invention provides a vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core, which has the following beneficial effects: 1. Extremely lightweight, significantly reduced levitation power consumption: The overall tensioning structure is mainly composed of cable net, with very little material used and extremely light weight, which greatly reduces the electromagnetic force required for levitation and significantly reduces coil power consumption and heat generation; 2. Zero mechanical friction and significantly extended lifespan: The flow guide core is suspended in the air duct cavity by electromagnetic force, without any mechanical contact with the air duct wall, which fundamentally eliminates friction and wear; at the same time, the tensioned overall structure has high structural fault tolerance, and even if individual cable units fail, the overall configuration can still be maintained through stress redistribution. No mechanical contact means no friction particles are generated, which is suitable for use scenarios with high cleanliness requirements. 3. Rigid-flexible coupling for impact resistance: The tension redistribution of the cable net can absorb the impact energy of the airflow, forming a double protection with electromagnetic active damping. Its anti-disturbance ability is better than that of a pure rigid structure. Some airflow passes through the cable net pores inside the core, forming an internal and external dual-channel airflow path, resulting in more uniform airflow distribution and better rectification effect. 4. The electromagnetic levitation system can actively adjust the axial position of the guide core according to the real-time operating conditions of the vacuum cleaner to achieve precise and optimal matching of the flow channel cross-section—expanding the inlet and narrowing the outlet under high resistance conditions to improve flow rate and throughput, and narrowing the inlet and expanding the outlet under low resistance conditions to save energy and reduce noise. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to the present invention; Figure 2 This is a schematic cross-sectional view of the vacuum cleaner duct assembly of the present invention; Figure 3 This is a schematic cross-sectional view of the air duct of the present invention; Figure 4 This is a schematic diagram of the overall structure of the tensioned integral flow guide core of the present invention; Figure 5 This is a schematic diagram of the internal structure of the tensioned integral flow guide core of the present invention; Figure 6 This is a schematic diagram of the three-bar, nine-cable structure of the tensioned integral flow guide core of the present invention; Figure 7 This is a schematic diagram of the overall structure of the magnetic levitation electromagnetic actuation component of the present invention; Figure 8 This is a schematic diagram of the controllable axial Halbach array of the present invention; Figure 9 This is a flowchart illustrating the working process of the vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to the present invention. In the picture: 1- Duct wall; 2- Tensioned integral flow guide core; 3- Magnetic levitation electromagnetic actuator; 101-Inlet acceleration section; 102-Suspension working section; 103-Outlet diffuser section; 104-Front limit boss; 105-Rear limit boss; 106-Inner cavity of air duct; 107-Air duct wall; 201-Rigid pressure bar; 202-Flexible cable; 203-Spatial node; 204-Permanent magnet array; 205-Helical guide cable; 206-Microporous breathable flexible membrane; 301 - Radial electromagnetic wire coil; 302 - Axial electromagnetic wire coil; 303 - Controllable axial Halbach array; 3031 - Halbach outer ring stator; 3032 - Halbach inner ring rotor; 3033 - Halbach permanent magnet block. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] The following is based on the appendix Figure 1-9 The present invention will be described in detail, such as Figure 1 and Figure 2 As shown, a vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core includes an air duct 1, a tensioned integral guide core 2, and a magnetic levitation electromagnetic actuator 3. The tensioned integral guide core 2 is disposed in the inner cavity 106 of the air duct and is coaxially arranged with the air duct wall 107. The tensioned integral guide core 2 is a three-bar, nine-cable tensioned integral self-balancing spatial mesh structure, formed by combining rigid compression members and flexible tension members. The outer envelope has a streamlined rotating body shape, forming an annular airflow channel between it and the inner surface of the air duct wall 107. The permanent magnet array 204 is fixedly disposed on the rigid compression member. The magnetic levitation electromagnetic actuator 3 is embedded in the air duct wall 107 and cooperates with the permanent magnet array 204 to generate controllable electromagnetic force, realizing non-contact levitation of the tensioned integral guide core 2.

[0016] like Figure 3 As shown, the duct wall 107 is sequentially provided with an inlet acceleration section 101, a suspension working section 102, and an outlet diffuser section 103 along the airflow direction; the inner diameter of the inlet acceleration section 101 narrows along the airflow direction, forming a Venturi neck with the front end of the tensioned integral guide core 2; the inner diameter of the suspension working section 102 is constant, used to install the control elements of the magnetic levitation electromagnetic actuator 3; the inner diameter of the outlet diffuser section 103 expands along the airflow, realizing the energy recovery of dynamic pressure to static pressure.

[0017] The control system automatically adjusts the axial position of the tensioned integral guide core 2 according to the dust collection conditions; in the case of high-resistance carpet, the control system moves the tensioned integral guide core 2 backward to expand the cross-sectional area of ​​the inlet acceleration section 101 and narrow the cross-sectional area of ​​the outlet diffusion section 103; in the case of low-resistance hard floor, the control system moves the tensioned integral guide core 2 forward to reduce the cross-sectional area of ​​the inlet acceleration section 101 and expand the cross-sectional area of ​​the outlet diffusion section 103.

[0018] The air duct wall 107 is provided with a front limiting boss 104 and a rear limiting boss 105. The front limiting boss 104 and the rear limiting boss 105 only dock with the spatial node 203 of the tensioned integral guide core 2. The contact surface is covered with an elastic buffer pad. When the vacuum cleaner is powered off, the control system smoothly reduces the output current of the magnetic levitation electromagnetic actuator 3, and the tensioned integral guide core 2 slowly falls to the front limiting boss 104 and the rear limiting boss 105.

[0019] like Figure 4 As shown, the tensioned integral flow guide core 2 is formed by axial ellipsoidal stretching transformation based on a triangular prism topology. It includes 3 non-contact rigid pressure rods 201, 9 prestressed flexible cables 202, and 6 spatial nodes 203. All flexible cables 202 are continuously pre-tensioned to maintain the overall self-balancing configuration. The 3 rigid pressure rods 201 are evenly staggered and inclined along the circumference of the core. One end of each rigid pressure rod 201 is close to the air intake side spatial node 203, and the other end extends to the equatorial region of the core. The 3 rigid pressure rods 201 do not cross contact in space. The permanent magnet array 204 consists of 3 permanent magnets, which are embedded one-to-one in the middle equatorial section of the 3 rigid pressure rods 201. The three permanent magnets are arranged coplanarly on the equatorial plane of the maximum diameter of the core, with a circumferential interval of 120°. The magnetic poles are perpendicular to the axis of the rigid pressure rods 201 and point radially outward to the air duct wall 107.

[0020] like Figure 5 As shown, the nine flexible cables 202 are divided into six circumferential tension cables and three diagonal torsion cables; the circumferential cables constrain the contours at both ends of the core and control the axial stiffness, while the diagonal torsion cables enhance the structure's torsional resistance; the six spatial nodes 203 are divided into three on the air inlet side and three on the air outlet side. Each spatial node 203 connects the end of one rigid pressure bar 201 to the ends of three flexible cables 202. The spatial node 203 is the only contact point for limiting movement.

[0021] like Figure 6 As shown, the outer surface of the flexible cable 202 network is wrapped with a continuous spiral guide cable 205, which is an additional tension cable used to induce airflow to generate pre-swirl; the outer side of the flexible cable 202 network is covered with a microporous breathable flexible film 206, forming an inner and outer dual-channel airflow structure.

[0022] like Figure 7 and Figure 8As shown, the duct wall 107 is embedded with a bias permanent magnet to provide basic radial centripetal force and reduce the continuous power consumption of the magnetic levitation electromagnetic actuator 3. The magnetic levitation electromagnetic actuator 3 includes a radial electromagnetic coil 301 and an axial electromagnetic coil 302. A controllable axial Halbach array 303 is disposed at the air inlet and outlet ends of the duct wall 107, including a coaxially nested Halbach outer ring stator 3031 and a Halbach inner ring rotor 3032. The Halbach outer ring stator 3031 and the Halbach inner ring rotor 3032 are each composed of multiple Halbach permanent magnet blocks 3033 arranged circumferentially. The magnetization direction of adjacent Halbach permanent magnet blocks 3033 rotates 90° sequentially in the ring plane, so that the controllable axial Halbach array 303 generates axial single magnets. The Halbach inner ring rotor 3032 can rotate relative to the Halbach outer ring stator 3031. By changing the relative rotation angle between the Halbach inner ring rotor 3032 and the Halbach outer ring stator 3031, the direction and magnitude of the axial magnetic force can be infinitely adjusted between forward and backward. The axial electromagnetic coils 302 are respectively located at the air inlet and air outlet of the air duct. There are 4 sets of radial electromagnetic coils 301, which are arranged in a circumferential ring array along the air duct wall 107. The displacement sensor array includes axial displacement sensors and radial displacement sensors. The axial sensors are located at both ends of the air duct. There are 3 radial sensors, which are staggered between the radial electromagnetic coils 301. The radial electromagnetic coils 301, axial electromagnetic coils 302, and displacement sensors are sealed and encapsulated inside the air duct wall 107, completely isolated from the dust-laden airflow.

[0023] like Figure 9 As shown, a vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core includes the following steps: Step S1: Power-on levitation initialization: After the vacuum cleaner is powered on, the control system prioritizes outputting drive current to the magnetic levitation electromagnetic actuator 3, which, together with the bias permanent magnet built into the air duct wall 107, provides basic levitation magnetic force; the radial electromagnetic coil 301 and the axial electromagnetic coil 302 work together to generate controllable electromagnetic force, which, combined with the real-time position feedback closed-loop adjustment of the displacement sensor, enables the tensioned integral guide core 2 to establish stable contactless levitation, and the vacuum motor is started after the levitation calibration is completed; Step S2: Adaptive airflow control: During normal vacuuming, the control system collects the motor speed and negative pressure signal of the air duct cavity 106 in real time, and simultaneously reads the position and attitude data of the tensioned integral guide core 2 detected by the radial and axial displacement sensors; under high-resistance carpet conditions, the axial electromagnetic coil 302 is adjusted to drive the tensioned integral guide core 2 to move backward, expanding the annular flow cross-sectional area of ​​the air duct inlet acceleration section 101 and narrowing the flow cross-sectional area of ​​the outlet diffusion section 103; under low-resistance hard floor conditions, the tensioned integral guide core 2 is driven to move forward, reducing the cross-sectional area of ​​the inlet acceleration section 101 and expanding the cross-sectional area of ​​the outlet diffusion section 103 to achieve dynamic pressure recovery and noise reduction; Step S3: Airflow buffering and noise reduction: After the dust-laden airflow is pre-accelerated through the inlet acceleration section 101 of the air duct, it enters the suspension working section 102. The spiral guide cable 205 on the outside of the tensioned integral guide core 2 induces the airflow to generate a pre-swirling flow. The mesh of the flexible cable 202 forms an inner and outer double channel for uniform flow distribution. When the airflow impact causes instantaneous disturbance, the flexible cable 202 network of the tensioned integral guide core 2 is passively buffered through tension redistribution. The control system synchronously outputs the electromagnetic active damping of the magnetic levitation electromagnetic actuator 3 to suppress the vibration and displacement of the tensioned integral guide core 2. Step S4: Power failure and fall protection: After the vacuum cleaner is powered off, the control system controls the current of the magnetic levitation electromagnetic actuator 3 to decrease linearly and smoothly. The tensioned integral guide core 2 slowly descends under its own weight. It is only by relying on the spatial node 203 to contact the front limit boss 104 and the rear limit boss 105 elastic buffer pad to complete the stable limit. The flexible cable 202 is not subjected to impact load throughout the process.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core, characterized in that, The air duct assembly includes: an air duct (1), a tensioned integral flow guide core (2), and a magnetic levitation electromagnetic actuator (3); the tensioned integral flow guide core (2) is set in the inner cavity (106) of the air duct and is arranged coaxially with the air duct wall (107). The tensioned integral flow guide core (2) is a three-bar nine-cable tensioned integral self-balancing spatial mesh structure, which is formed by combining rigid compression members and flexible tension members. The outer envelope has a streamlined rotating body shape and forms an annular airflow channel with the inner surface of the air duct wall (107); the permanent magnet array (204) is fixed on the rigid compression member; the magnetic levitation electromagnetic actuator (3) is embedded in the air duct wall (107) and works with the permanent magnet array (204) to generate controllable electromagnetic force to realize non-contact levitation of the tensioned integral flow guide core (2).

2. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 1, characterized in that: The duct wall (107) is arranged in sequence along the airflow direction as an inlet acceleration section (101), a suspension working section (102), and an outlet diffuser section (103). The inner diameter of the inlet acceleration section (101) narrows along the airflow direction, forming a Venturi neck with the front end of the tensioned integral guide core (2). The inner diameter of the suspension working section (102) is constant, and it is used to install the control element of the magnetic levitation electromagnetic actuator (3). The inner diameter of the outlet diffuser section (103) expands along the airflow direction, realizing the recovery of dynamic pressure to static pressure energy.

3. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 1, characterized in that: The control system automatically adjusts the axial position of the tensioned integral guide core (2) according to the dust collection conditions; in the high resistance carpet condition, the tensioned integral guide core (2) is moved backward to expand the cross-sectional area of ​​the inlet acceleration section (101) and narrow the cross-sectional area of ​​the outlet diffusion section (103); in the low resistance hard ground condition, the tensioned integral guide core (2) is moved forward to reduce the cross-sectional area of ​​the inlet acceleration section (101) and expand the cross-sectional area of ​​the outlet diffusion section (103).

4. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 1, characterized in that: The air duct wall (107) is provided with a front limiting boss (104) and a rear limiting boss (105). The front limiting boss (104) and the rear limiting boss (105) only dock with the spatial node (203) of the tensioned integral guide core (2). The contact surface is covered with an elastic buffer pad. When the vacuum cleaner is powered off, the control system smoothly reduces the output current of the magnetic levitation electromagnetic actuator (3), and the tensioned integral guide core (2) slowly falls to the front limiting boss (104) and the rear limiting boss (105).

5. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 1, characterized in that: The tensioned integral flow guide core (2) is formed by axial ellipsoidal stretching transformation based on triangular prism topology. It includes 3 non-contact rigid pressure rods (201), 9 prestressed flexible cables (202), and 6 spatial nodes (203). All flexible cables (202) are continuously pre-tensioned to maintain the overall self-balancing configuration. The 3 rigid pressure rods (201) are evenly staggered and inclined along the circumference of the core. One end of each rigid pressure rod (201) is close to the air intake side spatial node (203), and the other end extends to the equatorial region of the core. The 3 rigid pressure rods (201) do not cross contact in space. The permanent magnet array (204) consists of 3 permanent magnets, which are embedded in the middle equatorial section of the 3 rigid pressure rods (201) one by one. The three permanent magnets are arranged coplanarly on the equatorial surface of the maximum diameter of the core, with a circumferential interval of 120°. The magnetic poles are perpendicular to the axis of the rigid pressure rods (201) and uniformly point to the radial outer side of the air duct wall (107).

6. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 5, characterized in that: The nine flexible cables (202) are divided into six circumferential tension cables and three diagonal torsion cables. The circumferential cables constrain the contours at both ends of the core and control the axial stiffness, while the diagonal torsion cables enhance the structure's torsional resistance. The six spatial nodes (203) are divided into three on the air inlet side and three on the air outlet side. Each spatial node (203) connects the end of one rigid pressure bar (201) to the end of three flexible cables (202). The spatial node (203) is the only contact point for limiting the movement.

7. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 5, characterized in that: The outer surface of the flexible cable (202) network is wrapped with a continuous spiral guide cable (205), which is an additional tension cable used to induce airflow to generate pre-swirling flow; the outer side of the flexible cable (202) network is covered with a microporous breathable flexible film (206) to form an internal and external dual-channel airflow structure.

8. The vacuum cleaner duct assembly with a tensioned integral electromagnetic levitation guide core according to claim 5, characterized in that: The duct wall (107) is embedded with a bias permanent magnet to provide basic radial centripetal force and reduce the continuous power consumption of the magnetic levitation electromagnetic actuator (3). The magnetic levitation electromagnetic actuator (3) includes a radial electromagnetic coil (301) and an axial electromagnetic coil (302). A controllable axial Halbach array (303) is set at the air inlet and outlet of the duct wall (107), including a coaxially nested Halbach outer ring stator (3031) and a Halbach inner ring rotor (3032). The Halbach outer ring stator (3031) and the Halbach inner ring rotor (3032) are respectively composed of multiple Halbach permanent magnet blocks (3033) arranged circumferentially. The magnetization direction of adjacent Halbach permanent magnet blocks (3033) rotates 90° in sequence in the ring plane, so that the controllable axial Halbach array (303) generates an axial unilateral magnetic field. The Halbach inner ring rotor (3032) can be relative to the Halbach... The outer ring stator (3031) rotates, and the direction and magnitude of the axial magnetic force can be infinitely adjusted between forward and backward by changing the relative rotation angle between the Halbach inner ring rotor (3032) and the Halbach outer ring stator (3031); the axial electromagnetic coils (302) are respectively located at the air inlet and air outlet of the air duct; there are 4 sets of radial electromagnetic coils (301), which are arranged in a circumferential ring array along the air duct wall (107); the displacement sensor array includes axial displacement sensors and radial displacement sensors; the axial sensors are located at both ends of the air duct; there are 3 radial sensors, which are arranged alternately between the radial electromagnetic coils (301); the radial electromagnetic coils (301), axial electromagnetic coils (302), and displacement sensors are sealed and encapsulated inside the air duct wall (107), completely isolated from the dust-laden airflow.

9. A vacuum cleaner method for a vacuum cleaner duct assembly having a tensioned integral electromagnetic levitation guide core according to any one of claims 1 to 8, characterized in that, The vacuuming method includes the following steps: Step S1: Power-on levitation initialization: After the vacuum cleaner is powered on, the control system prioritizes outputting drive current to the magnetic levitation electromagnetic actuator (3), which, together with the built-in bias permanent magnet in the air duct wall (107), provides basic levitation magnetic force; the radial electromagnetic coil (301) and the axial electromagnetic coil (302) work together to generate controllable electromagnetic force, which, combined with the real-time position feedback closed-loop adjustment of the displacement sensor, enables the tensioned integral guide core (2) to establish stable non-contact levitation, and the vacuum motor is started after the levitation calibration is completed; Step S2: Adaptive airflow control: During normal vacuuming, the control system collects the motor speed and negative pressure signal of the air duct cavity (106) in real time, and reads the position and attitude data of the tensioned integral guide core (2) detected by the radial and axial displacement sensors. Under high-resistance carpet conditions, the axial electromagnetic coil (302) is adjusted to drive the tensioned integral guide core (2) to move backward, expanding the annular flow cross-sectional area of ​​the air duct inlet acceleration section (101) and narrowing the flow cross-sectional area of ​​the outlet diffusion section (103). Under low-resistance hard floor conditions, the tensioned integral guide core (2) is driven to move forward, reducing the cross-sectional area of ​​the inlet acceleration section (101) and expanding the cross-sectional area of ​​the outlet diffusion section (103) to achieve dynamic pressure recovery and noise reduction. Step S3: Airflow buffering and noise reduction: After the dust-laden airflow is pre-accelerated through the inlet acceleration section (101) of the air duct, it enters the suspension working section (102). The spiral guide cable (205) on the outside of the tensioned integral guide core (2) induces the airflow to generate a pre-swirling flow. The mesh of the flexible cable (202) forms an inner and outer double channel for uniform flow distribution. When the airflow impact causes instantaneous disturbance, the flexible cable (202) network of the tensioned integral guide core (2) is passively buffered through tension redistribution. The control system synchronously outputs the electromagnetic active damping of the magnetic levitation electromagnetic actuator (3) to suppress the vibration deviation of the tensioned integral guide core (2). Step S4: Power failure and fall protection: After the vacuum cleaner is powered off, the control system controls the current of the magnetic levitation electromagnetic actuator (3) to decrease linearly and smoothly, and the tensioned integral guide core (2) slowly descends under its own weight. It only relies on the spatial node (203) to contact the front limit boss (104) and the rear limit boss (105) elastic buffer pad to complete the stable limit. The flexible cable (202) is not affected by impact load throughout the process.

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