Blade assembly and neck fan

Abstract

The application provides a blade assembly and a neck-hung fan, and relates to the field of fans. The blade assembly comprises a bottom plate, a plurality of first blades and a plurality of second blades; the bottom plate has a central shaft, the bottom plate is used for coaxial connection to an output shaft of a driving mechanism, and a first surface of the bottom plate is connected to the plurality of first blades and the plurality of second blades; the plurality of first blades are uniformly arranged around the central shaft, the first blade has an air outlet surface, and the air outlet surfaces of the plurality of first blades are arranged around a first direction; the plurality of second blades are uniformly arranged on the inner side of the plurality of first blades around the central shaft, the second blade has a wind guide surface, and the wind guide surfaces of the plurality of second blades are arranged around the first direction. The application can reduce the noise of the blade assembly and improve the use experience of users.

Description

Technical Field

[0001] This application relates to the field of fans, and more particularly to blade assemblies and neck fans. Background Technology

[0002] Neck fans are a common type of fan that can deliver air while freeing the user's hands. The blade assembly is an important component of a neck fan, rotating under the drive of an electric motor to deliver air to the user; however, the blade assembly can be noisy when in operation, affecting the user experience. Summary of the Invention

[0003] This application provides a blade assembly and a neck-mounted fan to solve the problem of high noise from the blade assembly, which affects the user experience.

[0004] This application provides a blade assembly, including a base plate, a plurality of first blades, and a plurality of second blades;

[0005] The base plate has a central shaft and is used to be coaxially connected to the output shaft of the drive mechanism. The first surface of the base plate is connected to the plurality of first blades and the plurality of second blades.

[0006] The plurality of first blades are evenly arranged around the central axis, and each first blade has an air outlet surface. The air outlet surfaces of the plurality of first blades are arranged around a first direction.

[0007] The plurality of second blades are evenly arranged around the central axis on the inner side of the plurality of first blades. The second blades have air guiding surfaces, and the air guiding surfaces of the plurality of second blades are arranged around the first direction.

[0008] By adopting the above technical solution, when the blade assembly is in working condition, the drive mechanism drives the base plate to rotate through the output shaft, so that multiple first blades located on the first surface of the base plate rotate around the central axis in the first direction, thereby generating airflow using the air outlet surface of multiple first blades.

[0009] Furthermore, the multiple second blades located inside the multiple first blades rotate around the central axis in the first direction. The air guide surfaces of the multiple second blades can play a certain role in regulating the airflow inside the multiple first blades, reducing the possibility of turbulence generated inside the multiple first blades, thereby reducing the noise of the blade assembly and improving the user experience.

[0010] In some possible implementations, the air outlet surface of the first blade is configured as a concave air outlet surface, with a plane perpendicular to the central axis as the cross section, and the cross-sectional area of ​​the first blade gradually decreases along the direction away from the base plate.

[0011] And / or, the air guiding surface of the second blade is configured as a concave air guiding surface, with a plane perpendicular to the central axis as the cross-section, and the cross-sectional area of ​​the second blade gradually decreases along the direction away from the base plate.

[0012] In some possible implementations, the side of the first blade away from the central axis is perpendicular to the base plate, and the side of the first blade near the central axis gradually moves away from the central axis in the direction away from the base plate.

[0013] The side of the second blade away from the central axis is perpendicular to the base plate, and the side of the second blade closest to the central axis gradually moves away from the central axis in the direction away from the base plate.

[0014] In some possible implementations, the base plate is provided with a mounting portion, which is disposed on a first surface of the base plate;

[0015] The mounting part is coaxially disposed on the central axis, the mounting part is disposed on the inner side of the plurality of first blades, and the mounting part is connected to the plurality of second blades.

[0016] In some possible implementations, the first surface of the base plate is provided with an annular air guide portion, the annular air guide portion is connected to the plurality of first blades, and the annular air guide portion is inclined toward the protrusion.

[0017] And / or, the mounting portion is provided with a concave surface, the concave surface being connected to the plurality of second blades.

[0018] In some possible implementations, the blade assembly further includes a plurality of third blades disposed on the second surface of the base plate;

[0019] The base plate is provided with ventilation holes, the first end of the ventilation holes is connected to the first surface of the base plate, and the second end of the ventilation holes is connected to the second surface of the base plate;

[0020] At least one of the plurality of first blades, the plurality of second blades, and the plurality of third blades is configured as a plastic fiber-reinforced blade.

[0021] In some possible implementations, in the first direction, the air outlet surface of the first blade is inclined toward the base plate;

[0022] And / or, in the first direction, the air guide surface of the second blade is inclined toward the base plate.

[0023] This application embodiment also provides a neck fan, including a main body, a drive mechanism, and the blade assembly described in any of the above embodiments;

[0024] The main body is provided with a receiving cavity, which accommodates the blade assembly;

[0025] The drive mechanism is disposed on the main body, and the output shaft of the drive mechanism is at least partially disposed within the accommodating cavity. The output shaft of the drive mechanism is coaxially connected to the base plate.

[0026] In some possible implementations, the drive mechanism includes a control board, as well as cooperating stator and rotor assemblies;

[0027] The control board is disposed on the main body, and the control board is electrically connected to the stator assembly and the mover assembly. The mover assembly is sleeved on the stator assembly, and the mover assembly forms the output shaft of the drive mechanism.

[0028] In some possible implementations, the drive mechanism includes a control board, as well as cooperating stator and rotor assemblies;

[0029] The control board is disposed on the main body, and the control board is electrically connected to the stator assembly and the mover assembly. The mover assembly is sleeved on the stator assembly, and the mover assembly forms the output shaft of the drive mechanism.

[0030] In some possible implementations, the drive mechanism further includes a Hall sensor electrically connected to the control board and oriented toward the actuator assembly.

[0031] In some possible implementations, the mover assembly includes a magnet and a retaining ring, the magnet being rotatably disposed on the outside of the stator assembly about the first direction;

[0032] The fixing ring is sleeved on the outer surface of the magnet, the inner side of the fixing ring is connected to the magnet, and the outer side of the fixing ring is connected to the second surface of the base plate.

[0033] In some possible implementations, a first gap is formed between the Hall sensor and the magnet in the first direction, the width of the first gap being greater than or equal to 0.4 mm and less than or equal to 2.1 mm;

[0034] And / or, in the radial direction of the magnet, a second gap is formed between the Hall sensor and the inner surface of the magnet, the width of the second gap being greater than or equal to 0.5 mm and less than or equal to 1.8 mm.

[0035] In some possible implementations, the neck fan further includes a battery module electrically connected to the drive mechanism;

[0036] The battery module includes battery cells and a battery protection board, and the battery cells include a positive electrode and a negative electrode.

[0037] The battery protection board includes a switching element and a control element. The first end of the switching element is electrically connected to the positive terminal, and the second end of the switching element is electrically connected to the negative terminal.

[0038] The control element is electrically connected to the switching element to control the on / off state between the first terminal and the second terminal of the switching element; the control element includes one or more of the following: overcharge protection element, over-discharge protection element, temperature protection element, and overcurrent protection element.

[0039] In some possible implementations, the battery module further includes a connector, which includes a buffer portion and a contact portion connected to each other. The buffer portion is disposed on the battery protection plate, and one end of the buffer portion opposite to the battery protection plate is connected to the contact portion.

[0040] The contact portion is arranged parallel to the battery protection plate, the surface of the contact portion facing the battery protection plate is spaced apart from the battery protection plate, and the surface of the contact portion away from the battery protection plate abuts against the positive electrode or the negative electrode. Attached Figure Description

[0041] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0042] Figure 1 This is a schematic diagram of the blade assembly provided in an embodiment of this application;

[0043] Figure 2 A schematic diagram of the blade assembly according to another embodiment provided in this application;

[0044] Figure 3 Another perspective provided for the embodiments of this application Figure 2 Schematic diagram of the middle blade assembly;

[0045] Figure 4 This is an exploded perspective view of the neck fan provided in the embodiment of this application, wherein air inlets can be provided on both the inner and outer sidewalls of the same fan component;

[0046] Figure 5 Provided for the embodiments of this application Figure 4 An exploded view of the structure of the neck-mounted fan section;

[0047] Figure 6 This is a schematic diagram of the main body and air duct provided in the embodiments of this application;

[0048] Figure 7 This is a partial structural schematic diagram of the drive mechanism provided in an embodiment of this application;

[0049] Figure 8 A cross-sectional view of a portion of the structure of the drive mechanism provided in an embodiment of this application;

[0050] Figure 9 A cross-sectional view of a portion of the structure of a drive mechanism according to another embodiment provided in this application;

[0051] Figure 10 A schematic diagram of the structure of the drive mechanism for another embodiment provided in this application;

[0052] Figure 11 A cross-sectional view of a portion of the structure of a drive mechanism according to another embodiment provided in this application;

[0053] Figure 12 A cross-sectional view of a portion of the structure of a drive mechanism according to another embodiment provided in this application;

[0054] Figure 13 A schematic diagram of the structure of the drive mechanism for another embodiment provided in this application;

[0055] Figure 14 A cross-sectional view of a portion of the structure of a drive mechanism according to another embodiment provided in this application;

[0056] Figure 15 This is a schematic diagram of the structure of the battery module provided in an embodiment of this application.

[0057] Explanation of reference numerals in the attached figures:

[0058] 100. Blade assembly;

[0059] 110. Base plate; 111. Annular air guide; 112. Ventilation hole; 113. Mounting part; 120. First blade; 130. Second blade; 140. Third blade;

[0060] 200. Main body;

[0061] 210. Inner wall; 220. Outer wall; 230. Connecting wall; 240. Receiving cavity; 250. Air duct; 260. Air inlet; 270. Air outlet;

[0062] 300. Drive mechanism;

[0063] 310. Control board; 311. Positioning slot; 320. Hall sensor; 321. Connecting terminal; 330. Stator assembly; 331. Metal body; 332. Coil winding; 333. Plastic frame; 340. Mover assembly; 341. Magnet; 342. Retaining ring; 350. Bearing; 351. Silicone ring;

[0064] 400. Battery module;

[0065] 410. Battery cell; 420. Battery protection board; 421. Switching element; 422. Control component; 423. Connector; 4231. Buffer part; 4232. Contact part.

[0066] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0067] As described in the background section, the blade assembly is an important component of a neck fan. The blade assembly includes multiple blades evenly arranged around a central axis. These multiple blades can rotate under the drive of an electric motor, thereby delivering air to the user. However, when the blade assembly is in operation, turbulence is easily generated on the inner side of the multiple blades, resulting in high noise levels in the blade assembly and affecting the user's experience.

[0068] To solve the above-mentioned technical problems, this application provides a blade assembly and a neck fan. The blade assembly includes a base plate, a plurality of first blades and a plurality of second blades. The plurality of first blades and the plurality of second blades are all disposed on the first surface of the base plate, and the plurality of second blades are disposed on the inner side of the plurality of first blades. When the blade assembly is in working state, the drive mechanism drives the base plate to rotate through the output shaft, so that the plurality of first blades located on the first surface of the base plate rotate around the central axis in a first direction, thereby generating airflow using the air outlet surface of the plurality of first blades.

[0069] Furthermore, the multiple second blades located inside the multiple first blades rotate around the central axis in the first direction. The air guide surfaces of the multiple second blades can play a certain role in regulating the airflow inside the multiple first blades, reducing the possibility of turbulence generated inside the multiple first blades, thereby reducing the noise of the blade assembly and improving the user experience.

[0070] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0071] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0072] Reference Figures 1-3 This application provides a blade assembly 100, including a base plate 110, a plurality of first blades 120 and a plurality of second blades 130; wherein, the base plate 110 has a central shaft and is used for coaxial connection to the output shaft of the drive mechanism 300; exemplaryly, the base plate 110 may have a first surface and a second surface opposite to the first surface, the first surface of the base plate 110 is connected to the plurality of first blades 120 and the plurality of second blades 130, and the second surface of the base plate 110 is used for connection to the output shaft of the drive mechanism 300.

[0073] For example, a plurality of first blades 120 are evenly arranged around a central axis, each first blade 120 having an air outlet surface, and the air outlet surfaces of the plurality of first blades 120 are arranged around a first direction; a plurality of second blades 130 are evenly arranged around a central axis on the inner side of the plurality of first blades 120, each second blade 130 having an air guide surface, and the air guide surfaces of the plurality of second blades 130 are arranged around the first direction, that is, the arrangement direction of the plurality of second blades 130 is the same as the arrangement direction of the plurality of first blades 120, so as to reduce the possibility of turbulence generated on the inner side of the plurality of first blades 120 by the plurality of second blades 130.

[0074] It should be noted that the first direction can be set to a clockwise direction, or the first direction can also be set to a counterclockwise direction; the air outlet surfaces of multiple first blades 120 are arranged around the first direction, and the air outlet surfaces of multiple first blades 120 can be set to face the first direction.

[0075] Reference Figures 1-3 In some possible implementations, the base plate 110 may be a circular base plate 110, and the base plate 110 may be provided with a mounting part 113. The mounting part 113 is disposed on the first surface of the base plate 110, coaxially disposed on the central axis, and disposed on the inner side of a plurality of first blades 120. The mounting part 113 connects to a plurality of second blades 130, so as to connect the plurality of second blades 130 through the mounting part 113.

[0076] In the thickness direction of the base plate 110, the height of the mounting part 113 can be less than the height of the first blade 120. The mounting part 113 can be integrally formed on the base plate 110. The center of the first surface of the base plate 110 is protruding, and the center of the second surface of the base plate 110 is recessed to form the mounting part 113. The center of the second surface of the base plate 110 can be used to connect the output shaft of the drive mechanism 300 so that the drive mechanism 300 drives the blade assembly 100 to rotate through the output shaft.

[0077] It should be noted that, in the thickness direction of the base plate 110, the end of the second blade 130 facing away from the base plate 110 can be flush with the end of the first blade 120 facing away from the base plate 110, that is, the length of the second blade 130 in the thickness direction of the base plate 110 is less than the length of the first blade 120 in the thickness direction of the base plate 110.

[0078] For example, the first surface of the base plate 110 may be provided with an annular air guide portion 111, which connects to a plurality of first blades 120. The annular air guide portion 111 is inclined toward the protrusion, that is, the inner side of the annular air guide portion 111 is concave relative to the outer side of the annular air guide portion 111, so as to connect the plurality of first blades 120 through the annular air guide portion 111, thereby improving the air outlet effect of the first blades 120 through the annular air guide portion 111; and / or, the mounting portion 113 may be provided with a concave surface, which connects to a plurality of second blades 130, thereby improving the air outlet effect of the second blades 130 through the concave surface.

[0079] Reference Figures 1-3 In some possible implementations, the air outlet surface of the first blade 120 can be configured as a concave air outlet surface, with a plane perpendicular to the central axis as the cross section, and the cross-sectional area of ​​the first blade 120 gradually decreases along the direction away from the base plate 110; for example, the side of the first blade 120 away from the central axis can be perpendicular to the base plate 110, and the side of the first blade 120 close to the central axis gradually moves away from the central axis along the direction away from the base plate 110.

[0080] And / or, the air guiding surface of the second blade 130 can be configured as a concave air guiding surface, with a cross-section of a plane perpendicular to the central axis, and the cross-sectional area of ​​the second blade 130 gradually decreases along the direction away from the base plate 110. For example, the side of the second blade 130 away from the central axis can be perpendicular to the base plate 110, and the side of the second blade 130 near the central axis gradually moves away from the central axis along the direction away from the base plate 110.

[0081] By adopting the above technical solution, when the air outlet surface of the first blade 120 is set as a concave air outlet surface and the air guide surface of the second blade 130 is set as a concave air guide surface; when the blade assembly 100 is in working state, the drive mechanism 300 drives the base plate 110 to rotate through the output shaft, and the multiple first blades 120 rotate around the central axis in the first direction. By setting the air outlet surface of the first blade 120 as a concave air outlet surface, the air volume of the first blade 120 is increased, and the air outlet effect of the first blade 120 is improved. Furthermore, with the plane perpendicular to the central axis as the cross section, the cross-sectional area of ​​the first blade 120 gradually decreases in the direction away from the base plate 110, reducing the possibility of turbulence generated inside the multiple first blades 120.

[0082] Furthermore, by setting the air guide surface of the second blade 130 as a concave air guide surface, the air volume of the second blade 130 is increased, further reducing the possibility of turbulence generated inside the multiple first blades 120 and reducing the noise of the blade assembly 100; and, with a plane perpendicular to the central axis as the cross section, the cross-sectional area of ​​the second blade 130 gradually decreases in the direction away from the base plate 110, reducing the possibility of turbulence generated inside the multiple second blades 130.

[0083] For example, in the first direction, the air outlet surface of the first blade 120 is inclined toward the base plate 110; and / or, in the first direction, the air guide surface of the second blade 130 is inclined toward the base plate 110.

[0084] It should be noted that by tilting the air outlet surface of the first blade 120 toward the base plate 110 and the air guide surface of the second blade 130 toward the base plate 110, the air volume of the first blade 120 and the second blade 130 is increased, thereby improving the air outlet effect of the blade assembly 100.

[0085] Reference Figures 1-3 In some possible implementations, the blade assembly 100 may further include a plurality of third blades 140 disposed on the second surface of the base plate 110; for example, the base plate 110 is also provided with a ventilation hole 112, the first end of the ventilation hole 112 being connected to the first surface of the base plate 110 and the second end of the ventilation hole 112 being connected to the second surface of the base plate 110, so that the airflow generated by the plurality of third blades 140 can flow from the second surface of the base plate 110 through the ventilation hole 112 to the first surface of the base plate 110, thereby increasing the air volume of the blade assembly 100.

[0086] It is easy to understand that, in the thickness direction of the base plate 110, multiple third blades 140 can be correspondingly set with multiple first blades 120, and the shape and arrangement of the third blades 140 can be the same as those of the first blades 120, so that multiple first blades 120 and multiple third blades 140 can work together to realize the air outlet process of the blade assembly 100.

[0087] In some possible implementations, at least one of the plurality of first blades 120, the plurality of second blades 130, and the plurality of third blades 140 is configured as a plastic fiber-reinforced blade to make the structure of the blade assembly 100 more stable.

[0088] In summary, when the blade assembly 100 is in operation, the drive mechanism 300 drives the base plate 110 to rotate through the output shaft, causing the multiple first blades 120 located on the first surface of the base plate 110 to rotate around the central axis in the first direction, thereby generating airflow using the air outlet surfaces of the multiple first blades 120.

[0089] Furthermore, the multiple second blades 130 located inside the multiple first blades 120 rotate around the central axis in the first direction. The air guide surfaces of the multiple second blades 130 can play a certain role in regulating the airflow inside the multiple first blades 120, reducing the possibility of turbulence generated inside the multiple first blades 120, thereby reducing the noise of the blade assembly 100 and improving the user experience.

[0090] Reference Figures 4-6 This application also provides a neck fan, including a main body 200, a drive mechanism 300, and a blade assembly 100 as described in any of the above embodiments; wherein, the main body 200 is provided with a receiving cavity 240, the receiving cavity 240 receiving the blade assembly 100; the drive mechanism 300 is disposed in the main body 200, the output shaft of the drive mechanism 300 is at least partially disposed in the receiving cavity 240, and the output shaft of the drive mechanism 300 is coaxially connected to the base plate 110 so as to drive the blade assembly 100 to rotate through the drive mechanism 300.

[0091] For example, the main body 200 may include an inner sidewall 210, an outer sidewall 220, and a connecting wall 230 sandwiched between the inner sidewall 210 and the outer sidewall 220. It should be noted that the inner sidewall 210, the outer sidewall 220, and the connecting wall 230 are not intended to limit the shape of the main body 200 to a polygon. They may also be cylinders or other irregular shapes. Alternatively, the main body 200 may include multiple layers of inner sidewall 210, outer sidewall 220, and connecting wall 230 that cooperate with each other to control noise, air intake efficiency, etc.

[0092] A duct 250 can also be formed within the main body 200, connecting to the receiving cavity 240, so that the air generated by the blade assembly 100 is discharged through the duct 250. The width of the duct 250 (i.e., w1 in the figure) is adapted to the width of the first blade 120 (i.e., w2 in the figure). For example, the width of the duct 250 and the width of the first blade 120 can be set to be basically the same. Alternatively, the width of the duct 250 can be smaller than the width of the first blade 120, so that the air entering the duct 250 can be pressurized by the duct 250 before being discharged from the duct 250, thereby improving the air output effect of the neck fan.

[0093] The neckband body 200 may also be provided with an air outlet 270, which may be connected to the end of the air duct 250 away from the receiving cavity 240. The air outlet 270 may include an elongated air outlet 270 extending along the length direction of the body 200, and / or, the air outlet 270 may include a dense air outlet 270 extending along the width direction of the body 200. The central axis of the elongated air outlet 270 is generally parallel to the central axis of the body 200. In this embodiment, "generally parallel" does not mean absolute parallelism, but rather that being substantially parallel or substantially parallel can achieve the air guiding effect.

[0094] Reference Figures 7-14 In some possible implementations, the drive mechanism 300 may include a control plate 310, and a cooperating stator assembly 330 and a mover assembly 340. The control plate 310 may be disposed in the main body 200, for example, the control plate 310 may be disposed in the receiving cavity. The control plate 310 is electrically connected to the stator assembly 330 and the mover assembly 340. The mover assembly 340 is sleeved on the stator assembly 330 and forms the output shaft of the drive mechanism 300. The mover assembly 340 is connected to the second surface of the base plate 110, thereby driving the blade assembly 100 to rotate through the mover assembly 340.

[0095] For example, the drive mechanism 300 also includes a Hall sensor 320, which is electrically connected to the control board 310 and faces the mover assembly 340 to obtain the rotational speed of the mover assembly 340. The Hall sensor 320 may be provided with a connection terminal 321, which can be electrically connected to the control board 310 by means of patch, insertion, and / or soldering, so that the Hall sensor 320 is electrically connected to the control board 310 through the connection terminal 321.

[0096] It should be noted that the Hall sensor 320 of this application preferentially uses semiconductor materials and semiconductor devices made with their good Hall effect performance. In this way, the Hall sensor 320 of this application has the advantages of being sensitive to magnetic fields, having a simple structure, small size, wide frequency response, large output voltage variation and long service life. Therefore, it can accurately measure the speed of the neck fan of this application.

[0097] Specifically, this application generates a Hall potential by passing a control current through both ends of a semiconductor wafer (not shown) of the Hall sensor 320 and applying a uniform magnetic field in the direction perpendicular to the semiconductor wafer. By setting and adjusting the Hall constant, bias current, magnetic field strength, and thickness of the semiconductor material of the Hall sensor 320, precise control is achieved, further reducing noise.

[0098] Compared with other types of speed sensors, the Hall sensor 320 of this application has high accuracy and good linearity. The Hall sensor 320 can sense the rotation process of the mover assembly 340 based on the Hall effect of the semiconductor, thereby obtaining the speed of the mover assembly 340.

[0099] Reference Figure 7 The control board 310 may be provided with a positioning groove 311, and at least part of the Hall sensor 320 is embedded in the positioning groove 311. The plane where the positioning groove 311 is located may be parallel to the plane where the motor drive board is located, so as to increase the heat dissipation area of ​​the Hall sensor 320.

[0100] In the thickness direction of the control plate 310, the positioning groove 311 may penetrate through the control plate 310; or, the positioning groove 311 may not penetrate through the control plate 310; or, the positioning groove 311 may be formed by setting a gasket after setting a gasket on the control plate 310 or by forming a groove through an adhesive component. This application embodiment does not impose further limitations on this.

[0101] For example, at least one of the inner wall 210, the outer wall 220 and the connecting wall 230 is provided with an air inlet 260 communicating with the accommodating cavity 240. The air inlet 260 faces the Hall sensor 320 to improve the heat dissipation effect of the Hall sensor 320. For example, the air inlet direction of the air inlet 260 can be perpendicular to the plane where the positioning groove 311 is located, so that the Hall sensor 320 can be cooled by the air from the air inlet 260, reducing the possibility that the Hall sensor 320 will become inaccurate due to the increase in temperature.

[0102] It should be noted that the control board 310 and its positioning groove 311 can be adjusted at a small angle according to the air inlet and outlet. At this time, there is a certain acute angle between the positioning groove 311 and the Hall sensor 320 and the air inlet 260. This acute angle does not affect the increase of the heat dissipation area of ​​the Hall sensor 320. Therefore, this situation is still basically vertical overall. Those skilled in the art should not understand it as a restriction that it must be 90° vertical, especially considering that there are also assembly errors and process errors.

[0103] Alternatively, the air intake direction of the air inlet 260 can also be parallel to the plane where the positioning groove 311 is located. It should be noted that the control board 310 and the positioning groove 311 on it can be adjusted at a small angle according to the air intake and exhaust. In this case, there is a certain acute angle between the positioning groove 311 and the Hall sensor 320 and the air intake direction of the air inlet 260. This acute angle does not affect the increase of the heat dissipation area of ​​the Hall sensor 320. Therefore, this situation is still considered to be basically parallel overall. Those skilled in the art should not understand it as a restriction that it must be completely parallel, especially considering the complex situations of assembly errors and process errors. It is sufficient to be basically parallel overall.

[0104] The following is in conjunction with the appendix Figures 7-14 The relative positions of the control board 310, stator assembly 330, mover assembly 340 and Hall sensor 320 of the drive mechanism 300 are described.

[0105] In some possible implementations, the stator assembly 330 may include a metal body 331, a coil winding 332, and a plastic frame 333 for separating the metal body 331 and the coil winding 332; wherein the metal body 331 may be configured to be composed of 6 to 20 metal sheets stacked together with a thickness between 0.2 mm and 0.8 mm, and the coil winding 332 is electrically connected to the control board 310.

[0106] For example, 8 to 10 metal sheets can be stacked to form a metal body 331, and the thickness of the metal sheets can be set to 0.35 mm or 0.5 mm to achieve seamless control of the rotation speed, improve the wobbling performance of the neck fan product, thereby achieving better speed control and speed switching, and reducing the possibility of wobbling.

[0107] The mover assembly 340 may include a magnet 341 and a retaining ring 342. The magnet 341 is rotatably disposed on the outside of the stator assembly 330 about a first direction. The retaining ring 342 is sleeved on the outer surface of the magnet 341. The inner side of the retaining ring 342 is connected to the magnet 341, and the outer side of the retaining ring 342 is connected to the second surface of the base plate 110, so that the magnet 341 drives the blade assembly 100 to rotate about the first direction through the retaining ring 342 under the action of the stator assembly 330.

[0108] Furthermore, the drive mechanism 300 may also include a bearing 350 and silicone rings 351 disposed at one or both ends of the bearing 350, so as to make the rotation process of the mover assembly 340 relative to the stator assembly 330 smoother. As for the specific arrangement of the bearing 350, the embodiments of this application do not impose further restrictions on it.

[0109] In the first direction, a first gap (i.e., S1 in the figure) is formed between the Hall sensor 320 and the magnet 341. The width of the first gap is greater than or equal to 0.4 mm and less than or equal to 2.1 mm. The first gap may refer to the distance value between the Hall sensor 320 and the nearest point of the mover assembly 340. For example, the first gap may refer to the distance value between the Hall sensor 320 and the end plane of the mover assembly 340, or the distance value between the Hall sensor 320 and the arc surface of the mover assembly 340.

[0110] For example, the width of the first interval can be set to one of 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 1.8 mm and 2.1 mm, thereby meeting the requirements of the neck fan to be thin and light, achieving high-precision detection of the Hall sensor 320, and at the same time allowing the neck fan structure to be flexible enough to allow for compression, bending and deformation, reducing the possibility of the Hall sensor 320 and the mover assembly 340 being scratched or damaged.

[0111] And / or, in the radial direction of the magnet 341, a second gap (i.e., S2 in the figure) is formed between the Hall sensor 320 and the inner surface of the magnet 341. The width of the second gap is greater than or equal to 0.5 mm and less than or equal to 1.8 mm. The second gap may refer to the distance value between the Hall sensor 320 and the nearest point of the mover assembly 340. For example, the second gap may refer to the distance value between the Hall sensor 320 and the end plane of the mover assembly 340, or the distance value between the Hall sensor 320 and the arc surface of the mover assembly 340.

[0112] For example, the width of the second interval can be set to one of 0.5 mm, 0.8 mm, 1 mm, 1.5 mm and 1.8 mm, thereby meeting the requirements of the neck fan to be thin and light, achieving high-precision detection of the Hall sensor 320, and at the same time allowing the neck fan structure to be flexible enough to allow for compression, bending and deformation, reducing the possibility of the Hall sensor 320 and the mover assembly 340 being scratched or damaged.

[0113] Reference Figure 3 In some possible implementations, the drive mechanism 300 may further include a rotating shaft, in which the thickness of the Hall sensor 320 (i.e., d1 in the figure) may be less than or equal to the depth of the positioning groove 311 (i.e., e1 in the figure) so as to house the Hall sensor 320 within the positioning groove 311; the connection terminal 321 of the Hall sensor 320 may penetrate through the side wall of the positioning groove 311 and be electrically connected to the control board 310, or the connection terminal 321 of the Hall sensor 320 may extend to the outside of the positioning groove 311 and be electrically connected to the control board 310.

[0114] Reference Figures 7-14 When the Hall sensor 320 is located within the space enclosed by the magnet 341, the first or second working interval between the Hall sensor 320 and the magnet 341 in the radial direction is greater than or equal to 0.4 mm and less than or equal to 2.1 mm; when one end of the Hall sensor 320 is not located within the space enclosed by the magnet 341, the first or second interval between the Hall sensor 320 and the magnet 341 in the axial direction is greater than or equal to 0.5 mm and less than or equal to 1.8 mm.

[0115] Alternatively, in the axial direction of the rotating shaft, the thickness of the Hall sensor 320 can be greater than the depth of the positioning groove 311 and at least partially protrude to the outside of the positioning groove 311, so that the Hall sensor 320 can be clamped for welding positioning during assembly, making the installation process of the Hall sensor 320 more convenient and improving the assembly efficiency of the neck fan; the connection terminal 321 of the Hall sensor 320 can penetrate through the side wall of the positioning groove 311 and be electrically connected to the control board 310, or the connection terminal 321 of the Hall sensor 320 can also extend to the outside of the positioning groove 311 and be electrically connected to the control board 310.

[0116] It is easy to understand that the Hall sensor 320 can also be embedded in the positioning groove 311, so that the whole can be modularly customized, and the possibility of the Hall sensor 320 becoming loose due to scratches can also be reduced.

[0117] Reference Figure 4 and Figure 15In some possible implementations, the neck fan may also include a battery module 400, which is electrically connected to the drive mechanism 300 to supply power to the drive mechanism 300.

[0118] Reference Figure 15 For example, the battery module 400 includes a battery cell 410 and a battery protection board 420. The battery cell 410 includes a positive electrode and a negative electrode to realize the charging and discharging process through the positive and negative electrodes. The battery cell 410 can be cylindrical or polyhedral, and the battery cell 410 includes two end faces disposed opposite to each other, and a side face connecting the two end faces. The positive and negative electrodes of the battery cell 410 can be located on two different end faces, or the positive and negative electrodes of the battery cell 410 can also be located on the same end face. This application embodiment does not further limit this.

[0119] The battery protection board 420 includes a switching element 421 and a control element 422. The first end of the switching element 421 is electrically connected to the positive terminal, and the second end of the switching element 421 is electrically connected to the negative terminal. The control element 422 is electrically connected to the switching element 421 to control the connection and disconnection between the first end and the second end of the switching element 421. This enables the protection of the battery cell 410 through the battery protection board 420, reducing the possibility of damage to the battery cell 410. For example, the control element 422 includes one or more of overcharge protection elements, over-discharge protection elements, temperature protection elements, and overcurrent protection elements to control the connection and disconnection between the positive and negative terminals of the battery cell 410 under different conditions.

[0120] For example, the battery protection board 420 can be composed of a rigid printed circuit board and a flexible printed circuit board. The battery protection board 420 can also be provided with a charging control circuit, a pre-charging circuit, a fuel meter circuit and a battery balancing circuit. The battery protection board 420 in this embodiment has a power-off function and can also communicate and control with the control circuit board of the neck fan.

[0121] The switching element 421 can be set as a metal strip or wire. The switching element 421 can be bent and shaped arbitrarily to make the installation process of the switching element 421 more convenient. The shape of the switching element 421 can correspond to the shape of the end face or side face of the battery cell 410 as a circle or a polygon.

[0122] When the positive and negative terminals of the battery cell 410 are located on two different end faces, some of the switching elements 421 can be set corresponding to the end face where the positive terminal is located, and some of the switching elements 421 connected to the negative terminal can extend to the end face where the positive terminal is located. Alternatively, some of the switching elements 421 can be set corresponding to the end face where the negative terminal is located, and some of the switching elements 421 connected to the positive terminal can extend to the end face where the negative terminal is located. When the positive and negative terminals of the battery cell 410 are located on the same end face, the switching elements 421 can be set facing the end faces where the positive and negative terminals are located. This will not be described in detail in the embodiments of this application.

[0123] For example, the battery module 400 may also include a connector 423, which includes a buffer portion 4231 and a contact portion 4232 connected to each other. The buffer portion 4231 may be disposed on the switching element 421 of the battery protection board 420. The end of the buffer portion 4231 facing away from the battery protection board 420 is connected to the contact portion 4232. The contact portion 4232 is disposed parallel to the battery protection board 420. The surface of the contact portion 4232 facing the battery protection board 420 is spaced apart from the battery protection board 420. The surface of the contact portion 4232 facing away from the battery protection board 420 abuts against the positive or negative electrode, thereby making the electrical connection between the switching element 421 and the positive and negative electrodes of the cell 410 more stable.

[0124] The switching element 421 may have a B+ port, a B- port, a P+ port, and a P- port. The positive terminal of the battery cell 410 is electrically connected to the B+ port, and the negative terminal of the battery cell 410 is electrically connected to the B- port. The P+ port and the P- port can be connected to the outside through wires, etc., so that the battery cell 410 can supply power to the outside and / or the outside can charge the battery cell 410.

[0125] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0126] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0127] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A blade assembly, characterized in that, Includes a base plate, multiple first blades, and multiple second blades; The base plate has a central shaft and is used to be coaxially connected to the output shaft of the drive mechanism. The first surface of the base plate is connected to the plurality of first blades and the plurality of second blades. The plurality of first blades are evenly arranged around the central axis, and each first blade has an air outlet surface. The air outlet surfaces of the plurality of first blades are arranged around a first direction. The plurality of second blades are evenly arranged around the central axis on the inner side of the plurality of first blades, and the second blades have air guiding surfaces, and the air guiding surfaces of the plurality of second blades are arranged around the first direction; The air outlet surface of the first blade is set as a concave air outlet surface, with a plane perpendicular to the central axis as the cross section, and the cross-sectional area of ​​the first blade gradually decreases along the direction away from the bottom plate; The air guiding surface of the second blade is set as a concave air guiding surface, with a plane perpendicular to the central axis as the cross section, and the cross-sectional area of ​​the second blade gradually decreases along the direction away from the bottom plate; The base plate is provided with a mounting part, which is disposed on the first surface of the base plate; The mounting part is coaxially disposed on the central axis, the mounting part is disposed on the inner side of the plurality of first blades, and the mounting part is connected to the plurality of second blades; The first surface of the base plate is provided with an annular air guide section, which is connected to the plurality of first blades; The mounting part is provided with a concave surface, and the concave surface is connected to the plurality of second blades.

2. The blade assembly according to claim 1, characterized in that, The side of the first blade away from the central axis is perpendicular to the base plate, and the side of the first blade close to the central axis gradually moves away from the central axis in the direction away from the base plate; The side of the second blade away from the central axis is perpendicular to the base plate, and the side of the second blade closest to the central axis gradually moves away from the central axis in the direction away from the base plate.

3. The blade assembly according to claim 1, characterized in that, The blade assembly further includes a plurality of third blades disposed on the second surface of the base plate; The base plate is provided with ventilation holes, the first end of the ventilation holes is connected to the first surface of the base plate, and the second end of the ventilation holes is connected to the second surface of the base plate; At least one of the plurality of first blades, the plurality of second blades, and the plurality of third blades is configured as a plastic fiber-reinforced blade.

4. The blade assembly according to claim 1, characterized in that, In the first direction, the air outlet surface of the first blade is inclined toward the base plate; And / or, in the first direction, the air guide surface of the second blade is inclined toward the base plate.

5. A neck fan, characterized in that, It includes a main body, a drive mechanism, and a blade assembly as described in any one of claims 1-4; The main body is provided with a receiving cavity, which accommodates the blade assembly; The drive mechanism is disposed on the main body, and the output shaft of the drive mechanism is at least partially disposed within the accommodating cavity. The output shaft of the drive mechanism is coaxially connected to the base plate.

6. The neck fan according to claim 5, characterized in that, The drive mechanism includes a control board, as well as a cooperating stator assembly and a mover assembly; The control board is disposed on the main body, and the control board is electrically connected to the stator assembly and the mover assembly. The mover assembly is sleeved on the stator assembly, and the mover assembly forms the output shaft of the drive mechanism.

7. The neck fan according to claim 6, characterized in that, The drive mechanism also includes a Hall sensor electrically connected to the control board and facing the actuator assembly.

8. The neck fan according to claim 7, characterized in that, The moving part assembly includes a magnet and a fixed ring, the magnet being rotatably disposed on the outside of the stator assembly about the first direction; The fixing ring is sleeved on the outer surface of the magnet, the inner side of the fixing ring is connected to the magnet, and the outer side of the fixing ring is connected to the second surface of the base plate.

9. The neck fan according to claim 8, characterized in that, In the first direction, a first gap is formed between the Hall sensor and the magnet, the width of the first gap being greater than or equal to 0.4 mm and less than or equal to 2.1 mm; And / or, in the radial direction of the magnet, a second gap is formed between the Hall sensor and the inner surface of the magnet, the width of the second gap being greater than or equal to 0.5 mm and less than or equal to 1.8 mm.

10. The neck fan according to any one of claims 5-9, characterized in that, The neck fan also includes a battery module, which is electrically connected to the drive mechanism; The battery module includes battery cells and a battery protection board, and the battery cells include a positive electrode and a negative electrode. The battery protection board includes a switching element and a control element. The first end of the switching element is electrically connected to the positive terminal, and the second end of the switching element is electrically connected to the negative terminal. The control element is electrically connected to the switching element to control the on / off state between the first terminal and the second terminal of the switching element; the control element includes one or more of the following: overcharge protection element, over-discharge protection element, temperature protection element, and overcurrent protection element.

11. The neck fan according to claim 10, characterized in that, The battery module also includes a connector, which includes a buffer portion and a contact portion connected to each other. The buffer portion is disposed on the battery protection board, and the end of the buffer portion facing away from the battery protection board is connected to the contact portion. The contact portion is arranged parallel to the battery protection plate, the surface of the contact portion facing the battery protection plate is spaced apart from the battery protection plate, and the surface of the contact portion away from the battery protection plate abuts against the positive electrode or the negative electrode.

Images