Flat suction structure capable of rotating freely

Abstract

The invention discloses a flat suction structure capable of rotating freely. The flat suction structure comprises a flat suction nozzle, the first spherical joint is arranged at the air outlet end of the flat suction nozzle, and a through hole in the first spherical joint is in butt joint with a first cavity in the flat suction nozzle; the dust collector butt joint pipe is in butt joint with the dust collector air inlet pipe; the second spherical joint is arranged at the air inlet end of the dust collector butt joint pipe, and a through hole in the second spherical joint is in butt joint with a third cavity in the dust collector butt joint pipe; the first spherical joint and the second spherical joint are rotatably inserted or sleeved and are spliced in the first spherical joint and the second spherical joint to form a second cavity; the second cavity is communicated with the first cavity and the third cavity; and the locking cover is positioned on the edge of the first spherical joint or the second spherical joint on the outer side. The flat suction structure of the dust collector can solve the problems that an existing flat suction structure of the dust collector is inconvenient to operate, poor in dust collection efficiency, strong in fatigue feeling of a user and poor in use experience feeling in use environments such as narrow spaces and irregular surfaces.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum cleaners, in particular to a flat suction structure capable of rotating freely. Background Art

[0002] A vacuum cleaner is generally used in conjunction with a corresponding flat suction structure. Before use, the flat suction structure is assembled on the air inlet duct of the vacuum cleaner. When in use, the suction nozzle of the flat suction structure is attached to the cleaning surface, so that the strong suction force at the suction nozzle can suck out the dust, hair and other dirt on the cleaning surface from the object to be cleaned and suck them into the vacuum cleaner. The vacuum cleaner separates and collects the dirt from the dust-laden airflow, and discharges the clean airflow to achieve efficient work. When in use, you can choose to remove the flat suction structure and store it separately from the vacuum cleaner, or you can choose not to disassemble it and store the two as a whole.

[0003] The flat suction structure connected to the air inlet duct of a conventional vacuum cleaner is mostly an integrated fixed structure. After the structure is connected to the air inlet duct of the vacuum cleaner, when in use, the relative inclination angle of the flat suction nozzle and the cleaning surface and the degree of fit between the two need to be adjusted, so the vacuum cleaner and the flat suction structure as a whole need to be adjusted. For some complex usage scenarios, such as some narrow spaces such as gaps against walls or close to the ground, and irregular structures such as the cleaning surface located at the inner corners of the structure, the posture of the vacuum cleaner and the flat suction structure need to be repeatedly adjusted, which makes the operation inconvenient and cannot ensure the close fit between the flat suction nozzle and the cleaning surface, which inevitably causes air leakage problems at this location, resulting in a large suction loss when using the flat suction structure, affecting the dust collection efficiency, and prolonging the use time of the vacuum cleaner and significantly reducing the cleanliness of the cleaning surface; the user holds the vacuum cleaner in a variety of postures, and the frequent adjustment and shifting of the center of gravity of the vacuum cleaner at this time significantly aggravates the user's wrist fatigue, further affecting the convenience and labor-saving performance of the vacuum cleaner.

[0004] Some flat suction structures are connected to the vacuum cleaner with a hose, which makes the structure of the whole machine loose. The user needs to bear the weight of the flat suction structure and the vacuum cleaner with both hands, which makes the user feel tired. When the vacuum cleaner and the flat suction structure move, the user's activities will be disturbed by the hose, so that the impact force generated can easily cause the user to become unstable or fall. The hose may also loosen or even detach from the end structure, making operation inconvenient. Summary of the invention

[0005] The purpose of the present invention is to provide a freely rotatable flat suction structure to solve the problems that the flat suction structure of the existing vacuum cleaner is inconvenient to operate, has poor dust collection efficiency, causes strong fatigue to the users, and has a poor user experience in a narrow space, irregular surface and other usage environments.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a flat suction structure that can rotate freely, comprising:

[0007] Flat suction nozzle;

[0008] The first spherical joint is arranged at the air outlet end of the flat suction nozzle, and the through hole on the first spherical joint is docked with the first cavity in the flat suction nozzle;

[0009] The vacuum cleaner docking pipe docks with the vacuum cleaner inlet air pipe;

[0010] The second spherical joint is arranged at the air inlet end of the vacuum cleaner docking pipe, and the through hole on the second spherical joint is docked with the third cavity in the vacuum cleaner docking pipe;

[0011] The first spherical joint and the second spherical joint are rotatably inserted or sleeved and form a second cavity by fitting inside;

[0012] The second cavity communicates with the first cavity and the third cavity;

[0013] The locking cover is positioned at the edge of the first spherical joint or the second spherical joint located on the outside.

[0014] As a further description of the above technical solution:

[0015] The end face of the air inlet end of the flat suction nozzle is a wedge-shaped surface;

[0016] The cross section of the first cavity is waist-shaped or oval-shaped, and the cross section of the third cavity is waist-shaped or oval-shaped.

[0017] As a further description of the above technical solution:

[0018] An insertion tube is arranged at the air outlet end of the vacuum cleaner docking pipe, and the insertion tube is inserted or sleeved with the stepped structure on the surface of the vacuum cleaner inlet air pipe;

[0019] A plurality of guiding ribs are circumferentially staggered on the surface of the insertion tube and the stepped structure.

[0020] As a further description of the above technical solution:

[0021] At least one notch is arranged at the outer end of the insertion tube, an elastic plate extends from the side surface of the notch, and a clamping block is arranged on the elastic plate;

[0022] Wherein, the clamping block is elastically clamped in the clamping groove on the surface of the stepped structure through the elastic plate.

[0023] As a further description of the above technical solution:

[0024] The second cavity is a cavity formed by fitting two hemispherical or semi-capsule-shaped structures;

[0025] The inner surface of the edge of the first spherical joint or the second spherical joint is provided with a receiving surface that expands outward, is wedge-shaped or arc-shaped.

[0026] As a further description of the above technical solution:

[0027] The line connecting the centers of the first spherical joint and the second spherical joint is parallel to the axes of the flat suction nozzle and the vacuum cleaner docking pipe, and the first spherical joint and the second spherical joint can rotate relative to each other along the line connecting their centers.

[0028] As a further description of the above technical solution:

[0029] The centers of the first spherical joint and the second spherical joint coincide, and the first spherical joint and the second spherical joint can rotate relative to each other along any axis.

[0030] As a further description of the above technical solution:

[0031] The outer surface of the edge of the first spherical joint or the second spherical joint located inside is provided with an annular boss and an annular rib;

[0032] The annular boss and the annular rib are arranged at intervals and an installation groove is formed between them, and an O-ring is embedded in the installation groove;

[0033] The locking cover is hermetically abutted against the annular boss, the O-ring and the annular rib.

[0034] As a further description of the above technical solution:

[0035] A protective housing is rotatably and tightly sleeved outside the first spherical joint, the second spherical joint and the locking cover;

[0036] The end of the locking cover is provided with a first arc-shaped enclosure, and an activity cavity is formed between the first spherical joint or the second spherical joint located inside and the locking cover and the first arc-shaped enclosure;

[0037] An electromagnet and a sensor are arranged on the outer surface of the first spherical joint or the second spherical joint located inside in the activity cavity, the electromagnet is connected to the sensor, and the sensor corresponds to the first arc-shaped enclosure;

[0038] A permanent magnet is arranged on the second arc-shaped enclosure at the end of the protective housing, and the electromagnet is magnetically connected to the permanent magnet after being electrified.

[0039] As a further description of the above technical solution:

[0040] The sensor is a piezoresistor.

[0041] In summary, due to the adoption of the above technical solutions, the present invention has the following beneficial effects compared with the prior art:

[0042] 1. Based on the usage defects of the existing vacuum cleaner products mentioned above, the flat suction structure of the present invention adopts a two-stage and rotatable structural design. During use, the vacuum cleaner can always be held in the most comfortable posture for the user. The orientation adjustment of the flat suction nozzle can be achieved by relatively freely rotating the flat suction nozzle, the vacuum cleaner, and the docking pipe of the vacuum cleaner according to the actual situation of the cleaning surface. Thus, the flat suction nozzle can be fully attached to the cleaning surface, ensuring the dust suction efficiency, greatly reducing the usage time of the vacuum cleaner, and reducing energy consumption, realizing the concepts of energy conservation, green use, and design; at the same time, maintaining the most stable and comfortable usage posture for the user and improving the usage experience.

[0043] 2. Considering that when the flat suction nozzle rotates relative to the docking pipe of the vacuum cleaner, the docking part of the first spherical joint and the second spherical joint is located at the corner of the air flow. At this time, the outside of the corner is significantly affected by the air flow impact and erosion. Therefore, a protective housing is also provided on this flat suction structure for the linkage design during the movement of the flat suction structure to reinforce and protect the outside of the air flow corner of the first spherical joint and the second spherical joint, improving the structural strength and buffering performance at this place, and further improving the structural flow guiding stability and structural service life. During use, when the flat suction nozzle rotates relative to the docking pipe of the vacuum cleaner, the dust-containing air flow inside the flat suction structure is relatively intensively concentrated outside the corner of the air flow formed at the docking part of the first spherical joint and the second spherical joint due to the relative rotation of the flat suction nozzle and the docking pipe of the vacuum cleaner. At this time, because the first arc-shaped enclosure presses on the sensor, the resistance value of the varistor changes, thereby causing changes in parameters such as the current in the circuit where the corresponding electromagnet is located, making the magnetic suction force formed between the electromagnet on this side and the permanent magnet increase. The protective housing rotates close to the locking cover, so that the area of the protective housing covering the area corresponding to the outside of the air flow corner on the first spherical joint increases, so as to fully support the structure at this place, and further improve the anti-impact and buffering performance of the structure at this place, thereby improving the structural strength and flow guiding stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0045] Figure 1 It is a schematic structural diagram of a flat suction structure that can rotate freely.

[0046] Figure 2 It is an exploded view of a flat suction structure that can rotate freely.

[0047] Figure 3 It is a cross-sectional view of the connection node of the first spherical joint, the second spherical joint, and the locking cover in a flat suction structure that can rotate freely.

[0048] Figure 4 It is a cross-sectional view of the connection node of the first spherical joint, the second spherical joint, the locking cover, and the protective housing in a flat suction structure that can rotate freely.

[0049] Figure 5 It is a usage state diagram of the first spherical joint, the second spherical joint, the locking cover, and the protective housing in a flat suction structure that can rotate freely.

[0050] Legend description:

[0051] 1. Flat suction nozzle;

[0052] 2. First spherical joint;

[0053] 3. Vacuum cleaner docking pipe; 31. Insertion pipe; 32. Notch; 33. Elastic plate; 34. Block; 35. Guide rib;

[0054] 4. Second spherical joint; 41. Ring-shaped boss; 42. Ring-shaped rib; 43. Installation groove; 44. Bearing surface;

[0055] 5. Locking cover; 51. First arc-shaped enclosure; 52. Activity cavity;

[0056] 6. O-ring seal;

[0057] 7. Protective housing; 71. Second arc-shaped enclosure;

[0058] 8. Electromagnet; 81. Sensor;

[0059] 9. Permanent magnet;

[0060] 11. First cavity; 12. Second cavity; 13. Third cavity. Specific implementation manner

[0061] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0062] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0063] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0064] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "inner", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0065] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] Embodiment 1:

[0067] Please refer to Figures 1-3 , the present invention provides a technical solution: a rotatable flat suction structure, comprising:

[0068] Flat suction nozzle 1;

[0069] The first spherical joint 2 is arranged at the air outlet end of the flat suction nozzle 1, and the through hole on the first spherical joint 2 is docked with the first cavity 11 inside the flat suction nozzle 1;

[0070] The vacuum cleaner docking pipe 3 docks with the vacuum cleaner inlet pipe;

[0071] The second spherical joint 4 is arranged at the air inlet end of the vacuum cleaner docking pipe 3, and the through hole on the second spherical joint 4 is docked with the third cavity 13 inside the vacuum cleaner docking pipe 3;

[0072] The first spherical joint 2 and the second spherical joint 4 are rotatably inserted or sleeved and joined together inside to form a second cavity 12;

[0073] The second cavity 12 is communicated with the first cavity 11 and the third cavity 13;

[0074] During use, the motor in the vacuum cleaner main body operates, causing a negative pressure to be formed in the flat suction structure. Dust, hair, etc. on the cleaning surface enter the flat suction structure through the first cavity 11 of the flat suction nozzle 1. The dust-containing air flow continues to flow, enters the second cavity 12, and flows into the vacuum cleaner inlet duct through the third cavity 13. Then, it enters the vacuum cleaner dust cup for separation of impurities such as dust and hair. Finally, the clean air flow is discharged from the vacuum cleaner by the motor, thereby achieving efficient adsorption and separation of impurities.

[0075] However, the flat suction structures connected to the inlet duct of conventional vacuum cleaners are mostly integrally fixed structures. After this structure is connected to the vacuum cleaner inlet duct, during use, to adjust the relative inclination angle between the flat suction nozzle and the cleaning surface and the degree of their fit, the entire vacuum cleaner and the flat suction structure need to be adjusted. For some complex usage scenarios, such as narrow spaces like some gaps against the wall or close to the ground, and irregular structures such as the corners of the cleaning surface, repeated adjustments of the postures of the vacuum cleaner and the flat suction structure are required, making the operation inconvenient and unable to ensure the tight fit between the flat suction nozzle and the cleaning surface, resulting in inevitable air leakage at this place, causing a large suction loss in the use of the flat suction structure, affecting the dust suction efficiency, and prolonging the use time of the vacuum cleaner and significantly reducing the cleaning degree of the cleaning surface; the user holds the vacuum cleaner in various postures, and due to the frequent adjustment and deviation of the center of gravity of the vacuum cleaner at this time, the fatigue feeling of the user's wrist is significantly increased, further affecting the convenience and labor-saving performance of the vacuum cleaner.

[0076] Based on the above-mentioned use defects of existing vacuum cleaner products, the flat suction structure of the present invention adopts a two-stage and rotatable structure design. During use, the vacuum cleaner can always be held in the most comfortable posture for the user, and the orientation adjustment of the flat suction nozzle can be freely rotated relative to the vacuum cleaner and the vacuum cleaner docking pipe based on the actual situation of the cleaning surface. Thus, full fit between the flat suction nozzle and the cleaning surface is achieved, ensuring the dust suction efficiency, greatly reducing the use time of the vacuum cleaner, and reducing energy consumption, realizing the concepts of energy conservation, green use, and design; at the same time, maintaining the most stable and comfortable use posture for the user and improving the use experience.

[0077] The locking cover 5 is positioned at the edge of the first spherical joint 2 or the second spherical joint 4 located on the outside.

[0078] The locking cover 5 is mainly used for the sealing treatment of the spherical joint docking structure. Figures 1-5The structure assembly design of the first spherical joint 2 sleeved on the second spherical joint 4 is adopted. Therefore, the following description is mainly based on this freely rotatable docking structure. Of course, a design structure in which the first spherical joint 2 is inserted into the inner wall of the second spherical joint 4 can also be adopted, which will not be elaborated here.

[0079] Annular bosses 41 and annular ribs 42 are provided on the outer surface of the edge of the inner first spherical joint 2 or second spherical joint 4. As shown in the attached drawing, the annular bosses 41 and annular ribs 42 are arranged on the outer surface of one end of the second spherical joint 4 that is docked with the first spherical joint 2. Thus, stable sealing support and rotational guidance between the second spherical joint 4 and the first spherical joint 2 and the locking cover 5 can be achieved, thereby improving the rotational flexibility of the two-spherical-rotating docking structure. At the same time, the sealing performance at this part of the flat suction structure is ensured, avoiding the defect of air leakage at the docking part of the conventional adjustable structure, and thus ensuring no suction loss, efficient dust collection, and diversion use of the flat suction structure.

[0080] The annular bosses 41 and the annular ribs 42 are arranged at intervals and an installation groove 43 is formed between them. An O-ring 6 is embedded in the installation groove 43. On the basis of the sealing contact and guiding structure between the annular bosses 41, the annular ribs 42 and the first spherical joint 2 and the locking cover 5, the O-ring 6 is arranged in the installation groove 43 at the gap between them. Through its elastic and flexible structural characteristics, by tightly contacting its surface with the first spherical joint 2 and the locking cover 5, the sealing effect can be further improved. And when the first spherical joint 2 and the locking cover 5 rotate relatively freely within a certain range with respect to the second spherical joint 4, the O-ring 6 will not come out, thus ensuring a stable sealing effect.

[0081] Among them, multiple groups of the annular bosses 41 and the annular ribs 42 can be arranged at intervals and are tightly fitted and positioned with O-rings 6 of different positions and different sizes. The above structural dimensions and structural shapes are consistent with the corresponding positions on the inner wall of the first spherical joint 2. Thus, through several groups of coaxial circular sealing structures axially distributed on the surface of the second spherical joint 4, a more sufficient, tight, and freely rotatable spherical joint sealing design is realized, improving the sealing performance.

[0082] After the flat suction structure is assembled, the locking cover 5 is in sealing contact with the annular bosses 41, the O-ring 6, and the annular ribs 42.

[0083] The manufacturing process of a freely rotatable flat suction structure in this embodiment includes:

[0084] ① Embedding the O-ring 6 into the installation groove 43 on the surface of the second spherical joint 4;

[0085] ② Inserting the second spherical joint 4 into the first spherical joint 2;

[0086] ③ The locking cover 5 covers the second spherical joint 4, and its inner wall is in close contact with the annular boss 41, the annular rib 42, and the O-ring 6;

[0087] ④ Initially test the rotational flexibility of the second spherical joint 4, the first spherical joint 2, and the locking cover 5;

[0088] ⑤ The end face of the locking cover 5 is joined with the end face of the first spherical joint 2 and fixed in structure. In this embodiment, the two are fixed in structure by ultrasonic welding of the end faces. Of course, a detachable design with edge bolts and flange plates can also be used, or other conventional end face locking and fixing methods for hollow structures, and no further and more detailed elaboration will be made here.

[0089] Embodiment Two:

[0090] Please refer to Figures 1-3 , on the basis of the above Embodiment One, preferably, the end face of the air inlet end of the flat suction nozzle 1 is a wedge-shaped surface. This makes the air inlet end of the flat suction nozzle 1 fit more closely when docking with the cleaning surface. Compared with the vertical end face design perpendicular to its axis of the conventional flat suction nozzle, the orientation adjustment operation is more convenient and simple, and the windward area of the air inlet end is increased, which can further increase the air intake volume and achieve more efficient dust suction treatment of the cleaning surface.

[0091] The cross-section of the first cavity 11 is kidney-shaped or oval-shaped, and the cross-section of the third cavity 13 is kidney-shaped or oval-shaped. In this embodiment, the diversion cavities such as the first cavity 11 and the third cavity 13 are designed with a kidney-shaped or oval-shaped cross-section, which can improve the diversion stability and diversion efficiency of the dust-containing airflow compared with the conventional circular diversion pipe.

[0092] Embodiment Three:

[0093] Please refer to Figures 1-3 , on the basis of the above Embodiment One, preferably, an insertion tube 31 is provided at the air outlet end of the vacuum cleaner docking pipe 3, and the insertion tube 31 is inserted or sleeved with the stepped structure on the surface of the vacuum cleaner inlet pipe.

[0094] The surface of the insert tube 31 and the stepped structure are staggered to set a number of guide ribs 35 circumferentially. When the guide ribs 35 on the surfaces of the two structures are plugged in, they can be arranged at a larger interval so that they only abut and guide the corresponding insert tube 31 or stepped structure. The arrangement interval can also be reduced to achieve side abutment of adjacent guide ribs 35, to achieve a tighter mortise and tenon joint structure, to improve the tightness and reliability of the flat suction structure and the air inlet pipe of the vacuum cleaner. At this time, no other locking structure design is required, and stable assembly can be achieved, thereby improving the convenience of assembly, reducing the installation steps and processes, making the assembly process easier to use, and making the alignment and plugging between structures more convenient. In addition, the sizes of the guide ribs 35 on the two structures can be designed differently so that the direction can be quickly identified during assembly to further improve the convenience of alignment.

[0095] At least one notch 32 is disposed at the outer end of the insert tube 31 , an elastic plate 33 extends from the side of the notch 32 , and a clamping block 34 is disposed on the elastic plate 33 .

[0096] The clamping block 34 is elastically clamped in the clamping groove on the surface of the stepped structure through the elastic plate 33 .

[0097] The manufacturing process of a freely rotatable flat suction structure of this embodiment includes:

[0098] ① Identify the directions of the vacuum cleaner docking pipe 3 and the vacuum cleaner air inlet pipe through the guide ribs 35 and other components, and perform preliminary plugging of the plug pipe 31 and the stepped structure;

[0099] ② When the insertion tube 31 is plugged into the stepped structure, the block 34 is compressed and the elastic plate 33 tilts inward, so that the block 34 is pressed into the stepped structure synchronously until the block 34 docks with the slot of the stepped structure, thus completing the assembly docking of the flat suction structure and the air inlet pipe of the vacuum cleaner.

[0100] Embodiment 4:

[0101] See also Figures 2-3 On the basis of the above-mentioned embodiment 1, preferably, the second cavity 12 is a cavity formed by splicing two hemispheres or semi-capsule structures.

[0102] When the second cavity 12 is a cavity formed by splicing two hemispherical structures, the docking structure of the first spherical joint 2 and the second spherical joint 4 with the same structure is specifically: the center of the first spherical joint 2 coincides with the center of the second spherical joint 4, and the first spherical joint 2 and the second spherical joint 4 can rotate relative to each other along any axis.

[0103] The free-rotation connection structure of a first spherical joint 2 and a second spherical joint 4 in this embodiment can achieve the free rotation of the flat suction nozzle 1 and the vacuum cleaner inlet duct along any axis, making the attitude adjustment of the flat suction structure more flexible for complex usage scenarios.

[0104] When the second cavity 12 is a cavity formed by splicing two semi-capsule-like structures, the docking structure of the first spherical joint 2 and the second spherical joint 4 with the same structure is specifically as follows: The center line connecting the centers of the first spherical joint 2 and the second spherical joint 4 is parallel to the axes of the flat suction nozzle 1 and the vacuum cleaner docking pipe 3, and the first spherical joint 2 and the second spherical joint 4 can rotate relative to each other along their center line.

[0105] Another free-rotation connection structure of the first spherical joint 2 and the second spherical joint 4 in this embodiment can achieve the free rotation of the flat suction nozzle 1 along its axis, enabling the wedge-shaped end face of the flat suction nozzle 1 to be adjusted quickly and stably.

[0106] Compared with the previous structure, it is more convenient and stable for simple multi-surface dust suction cleaning operations, and there is no need to make excessive adjustments to the storage attitude of the flat suction structure during storage, making it more convenient to use.

[0107] Of course, in this structure, uniaxial rotation guidance of the first spherical joint 2 and the second spherical joint 4 is required, which can be achieved by rotatably embedding the annular boss 41 and the annular rib 42 into the first spherical joint 2 and / or the locking cover 5.

[0108] An outwardly expanding, wedge-shaped or arc-shaped receiving surface 44 is provided on the inner surface of the edge of the first spherical joint 2 or the second spherical joint 4 located inside. This improves the smoothness of the surface connection at the docking of the first spherical joint 2 and the second spherical joint 4, making the flow of the dust-containing air more stable.

[0109] Embodiment Five:

[0110] Please refer to Figures 4-5 , on the basis of the above Embodiment One, preferably, a protective housing 7 is rotatably and tightly sleeved outside the first spherical joint 2, the second spherical joint 4, and the locking cover 5.

[0111] Considering that when the flat suction nozzle 1 and the vacuum cleaner docking pipe 3 rotate relative to each other, the docking part of the first spherical joint 2 and the second spherical joint 4 is located at the corner of the airflow. At this time, the outside of the corner is significantly affected by the airflow impact and erosion. Therefore, in this embodiment, a protective housing 7 is provided for a linkage design during the movement of the flat suction structure to reinforce and protect the outside of the airflow corner of the first spherical joint 2 and the second spherical joint 4, improving the structural strength and buffering performance at this place, and further improving the structural flow stability and structural service life.

[0112] The structural features of the linkage structure between the protective housing 7 and the flat suction structure are specifically as follows:

[0113] A first arc-shaped enclosure 51 is provided at the end of the locking cover 5. An activity cavity 52 is formed between the first spherical joint 2 or the second spherical joint 4 located inside and the locking cover 5 and the first arc-shaped enclosure 51. The first arc-shaped enclosure 51 is mainly used for guiding the movement of the structures among the first spherical joint 2, the second spherical joint 4, and the locking cover 5, and is also used for sealing the connection between the locking cover 5 and the second spherical joint 4 to prevent external dust and other impurities from seeping in and adhering to the surface of the structure, which may hinder the rotation of the structure.

[0114] An electromagnet 8 and a sensor 81 are provided on the outer surface of the first spherical joint 2 or the second spherical joint 4 located inside within the activity cavity 52. The electromagnet 8 is connected to the sensor 81, and the sensor 81 corresponds to the first arc-shaped enclosure 51.

[0115] A permanent magnet 9 is provided on the second arc-shaped enclosure 71 at the end of the protective housing 7. After the electromagnet 8 is powered on, it is magnetically connected to the permanent magnet 9.

[0116] The sensor 81 is a varistor. Specifically, the adopted sensor 81 is: Pressure-Dependent Resistors are a type of special resistor, and their resistance values change with the applied pressure. This type of resistor is usually used in various pressure sensing applications, such as electronic scales, pressure switches, and industrial control systems. The relationship between the resistance value of the varistor and the pressure may be linear or non-linear, depending on the materials and manufacturing processes used. As a conventional electrical device that synchronously changes its resistance value with the change of external pressure, its specific structure will not be elaborated here.

[0117] The working principle or manufacturing process of a rotatable flat suction structure in this embodiment includes: during use, as Figure 5As shown in the figure, the flat suction nozzle 1 rotates relative to the vacuum cleaner docking pipe 3, and the rotation direction is as shown by the dotted arrow on the right. The solid arrow indicates the flow path of the dust-containing air flow inside the flat suction structure. The air flow is relatively intensively concentrated outside the corner of the air flow formed at the docking of the first spherical joint 2 and the second spherical joint 4 due to the relative rotation of the flat suction nozzle 1 and the vacuum cleaner docking pipe 3. At this time, since the first arc-shaped enclosure 51 presses on the sensor 81, the resistance value of the varistor changes, which in turn causes changes in parameters such as the current in the circuit where the corresponding electromagnet 8 is located, so that the magnetic suction force formed between the electromagnet 8 on this side and the permanent magnet 9 is enhanced, and the protective housing 7 rotates close to the locking cover 5. As a result, the area of the protective housing 7 covering the area corresponding to the outside of the air flow corner on the first spherical joint 2 increases, so as to fully support the structure at this place, thereby improving the impact resistance and buffering performance of the structure at this place, and thus improving the structural strength and flow guiding stability.

[0118] In summary, due to the adoption of the above technical solutions, a rotatable flat suction structure of this embodiment has the following beneficial effects compared with the prior art:

[0119] 1. Based on the use defects of the existing vacuum cleaner products proposed above, the flat suction structure of the present invention adopts a two-stage and rotatable structure design. When in use, the vacuum cleaner can always be held in the most comfortable posture for the user. The orientation adjustment of the flat suction nozzle is based on the actual situation of the cleaning surface by relatively freely rotating the flat suction nozzle and the vacuum cleaner and the vacuum cleaner docking pipe. Thus, the flat suction nozzle can be fully attached to the cleaning surface, ensuring the dust suction efficiency, greatly reducing the use time of the vacuum cleaner, and reducing energy consumption, realizing the concepts of energy saving, green use and design; at the same time, maintaining the most stable and comfortable use posture for the user and improving the use experience.

[0120] 2. Considering that when the flat suction nozzle rotates relative to the docking pipe of the vacuum cleaner, the docking joints of the first spherical joint and the second spherical joint are located at the corner of the airflow. At this time, the outside of the corner is significantly impacted and scoured by the airflow. Therefore, a protective housing is provided on this flat suction structure for a linkage design during the movement of the flat suction structure to reinforce and protect the outside of the airflow corner of the first spherical joint and the second spherical joint, improving the structural strength and buffering performance at this location, and further enhancing the structural flow guiding stability and the service life of the structure. During use, when the flat suction nozzle rotates relative to the docking pipe of the vacuum cleaner, the dust-containing airflow inside the flat suction structure is relatively densely concentrated outside the corner of the airflow formed at the docking joints of the first spherical joint and the second spherical joint due to the relative rotation of the flat suction nozzle and the docking pipe of the vacuum cleaner. At this time, because the first arc-shaped enclosure presses on the sensor, the resistance value of the piezoresistor changes, which in turn causes changes in parameters such as the current in the circuit where the corresponding electromagnet is located, making the magnetic suction force formed between the electromagnet on this side and the permanent magnet increase. The protective housing rotates closer to the locking cover, thereby increasing the area of the region on the protective housing that covers the first spherical joint and corresponds to the outside of the airflow corner, so as to fully support the structure at this location, further improving the impact resistance and buffering performance of the structure at this location, and thus enhancing the structural strength and flow guiding stability.

[0121] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A freely rotatable flat suction structure, characterized in that: include: Flat suction nozzle; A first spherical joint, which is arranged at the air outlet end of the flat suction nozzle, and a through hole on the first spherical joint is connected with a first cavity in the flat suction nozzle; A vacuum cleaner docking pipe, which is docked with the vacuum cleaner air inlet pipe; A second ball joint, which is arranged at the air inlet end of the vacuum cleaner docking tube, the through hole on the second ball joint is docked with the third cavity in the vacuum cleaner docking tube, the first ball joint and the second ball joint are rotatably plugged or sleeved and spliced ​​inside to form a second cavity, and the second cavity is connected to the first cavity and the third cavity; A locking cover is positioned on an edge of the first spherical joint or the second spherical joint located on the outside.

2. A freely rotatable flat suction structure according to claim 1, characterized in that: The air inlet end face of the flat suction nozzle is a wedge-shaped face, the cross section of the first cavity is a waist shape or an ellipse, and the cross section of the third cavity is a waist shape or an ellipse.

3. A freely rotatable flat suction structure according to claim 1, characterized in that: The air outlet end of the vacuum cleaner docking pipe is provided with an insert pipe, which is plugged or sleeved with the stepped structure on the surface of the vacuum cleaner air inlet pipe. The insert pipe and the stepped structure are circumferentially staggered to provide a plurality of guide ribs.

4. A freely rotatable flat suction structure according to claim 3, characterized in that: At least one notch is arranged at the outer end of the insertion tube, an elastic plate extends from the side of the notch, a clamping block is arranged on the elastic plate, and the clamping block is elastically clamped in the clamping groove on the surface of the stepped structure through the elastic plate.

5. A freely rotatable flat suction structure according to claim 1, characterized in that: The second cavity is a cavity formed by splicing two hemispheres or semi-capsule structures, and the inner surface of the edge of the first spherical joint or the second spherical joint located inside is provided with an outwardly expanding, wedge-shaped or arc-shaped receiving surface.

6. A freely rotatable flat suction structure according to claim 1, characterized in that: The line connecting the ball centers of the first spherical joint and the second spherical joint is parallel to the axis of the flat suction nozzle and the vacuum cleaner docking tube, and the first spherical joint and the second spherical joint can rotate relatively along the line connecting the ball centers.

7. A freely rotatable flat suction structure according to claim 1, characterized in that: The sphere centers of the first spherical joint coincide with those of the second spherical joint, and the first spherical joint and the second spherical joint can rotate relative to each other along any axis.

8. The freely rotatable flat suction structure according to claim 1, characterized in that: An annular boss and an annular convex rib are arranged on the outer surface of the edge of the first spherical joint or the second spherical joint located on the inner side. The annular boss and the annular convex rib are arranged at an interval and a mounting groove is formed therebetween. An O-ring is embedded in the mounting groove, and the locking cover is sealingly abutted against the annular boss, the O-ring and the annular convex rib.

9. The freely rotatable flat suction structure according to claim 1, characterized in that: A protective shell is rotatably and tightly fitted on the outside of the first spherical joint, the second spherical joint and the locking cover. A first arc-shaped enclosure is arranged at the end of the locking cover. An active cavity is formed between the first spherical joint or the second spherical joint located on the inside and the locking cover and the first arc-shaped enclosure. An electromagnet and a sensor are arranged on the outer surface of the first spherical joint or the second spherical joint located on the inside in the active cavity. The electromagnet is docked with the sensor, and the sensor corresponds to the first arc-shaped enclosure. A permanent magnet is arranged on the second arc-shaped enclosure at the end of the protective shell. The electromagnet is magnetically docked with the permanent magnet after being energized.

10. A freely rotatable flat suction structure according to claim 9, characterized in that: The sensor is a piezoresistor.

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