Fan head of handheld fan

Abstract

The invention relates to the technical field of handheld fans, and particularly discloses a fan head of a handheld fan, which comprises a fan shell, an air outlet cover and a flow guide cover, the fan shell is of a long-barrel-shaped structure, and an air outlet is formed in one end of the fan shell. The air outlet cover is of an annular structure and is clamped to the air outlet, and the outer diameter of the air outlet cover is in a radial shrinkage shape so as to form an arc-shaped transition structure with the outer wall of the fan shell; the flow guide cover is installed at the air outlet, a sealing end is formed at the outward end of the flow guide cover, and the sealing end is of an arc-shaped structure and sinks into the air outlet so as to be matched with the air outlet cover to reduce vortex and noise generated at the air outlet when the fan head discharges air. Through the radial shrinkage design of the air outlet cover, the outer wall of the air outlet cover and the fan shell form an arc-shaped transition structure, the phenomenon of air flow stripping at a traditional right-angle seam is eliminated, and therefore vortex and noise generated at an air outlet are reduced in combination with the sunken arc-shaped sealing end of the air guide cover.

Description

[0001] Divisional application

[0002] This application is a divisional application of the application with the application number [Application No.: 202110298949.4] and the invention title [Base and Handheld Fan with Base] filed on March 20, 2021. Technical Field

[0003] Embodiments of the present invention relate to the technical field of handheld fans, and in particular to a fan head of a handheld fan. Background Art

[0004] Handheld fans are favored by many people because of their small size, delicate appearance, convenient carrying, and easy use at close range. At present, most of the fan heads of handheld fans on the market adopt an open air outlet design, and their air outlet covers are usually flat grid structures or simple conical covers. Such designs have obvious defects when blowing air at high speed. For example, at the connection between the edge of the air outlet and the outer shell, the air flow is likely to suddenly spread, generating a vortex phenomenon, which not only reduces the air supply efficiency but also causes significant wind noise. In addition, most of the existing flow guide covers adopt an outwardly convex flow guide vane design. When air flows through the gap between the flow guide cover and the air outlet cover, secondary vortices are easily caused due to sudden pressure changes, resulting in high-frequency whistling.

[0005] Therefore, how to ensure the continuity of the flow path between the air outlet cover and the outer shell and the sealing performance of the flow guide cover, so as to reduce the vortices and noise generated at the air outlet when using a handheld fan, has become an important problem to be solved in the industry. Summary of the Invention

[0006] Based on this, in view of the above technical problems, it is necessary to provide a fan head for a handheld fan that can reduce the vortices and noise generated at the air outlet when using the handheld fan.

[0007] An embodiment of the present application provides a fan head of a handheld fan, and the fan head includes:

[0008] A fan outer shell, the fan outer shell has a long cylindrical structure and forms an air outlet at one end;

[0009] An air outlet cover, the air outlet cover has an annular structure and is snap-fitted to the air outlet, and the outer diameter of the air outlet cover is radially contracted to form an arc transition structure with the outer wall of the fan outer shell;

[0010] A flow guide cover, the flow guide cover is installed at the air outlet, and forms a sealing end at the outer end, the sealing end has an arc structure and is recessed into the air outlet, so as to cooperate with the air outlet cover to reduce the vortices and noise generated at the air outlet when the fan head blows air.

[0011] In one embodiment, the fan head further includes: an air inlet cover, which is installed at the air inlet located at the other end of the fan housing;

[0012] Wherein, the air inlet cover has a plurality of uniformly arranged and curved air inlet guide vanes, and the bending direction of each air inlet guide vane is opposite to the rotation direction of the impeller; alternatively, the air inlet cover is arranged in a grid shape or a honeycomb shape.

[0013] In one embodiment, the air inlet cover is snap - connected to the fan housing through a first snap - fit structure, and the first snap - fit structure includes a plurality of first recessed portions recessed on the side wall of the air inlet cover and a plurality of first protruding portions protruding on the inner wall of the fan housing;

[0014] Wherein, the shape and size of the first protruding portion are adapted to the first recessed portion, so that when installing the air inlet cover, the side wall of the air inlet cover extends into one end of the air inlet and the first recessed portion is snap - connected to the first protruding portion.

[0015] In one embodiment, the air outlet cover is snap - connected to one end of the air outlet through a second snap - fit structure;

[0016] Wherein, the second snap - fit structure includes a plurality of second recessed portions recessed on the inner wall of the air outlet cover and a plurality of second protruding portions protruding on the outer wall of the air outlet, and the shape and size of the second protruding portion are adapted to the second recessed portion;

[0017] When the air outlet cover is snap - connected to the air outlet, the second protruding portion is snap - fitted into the second recessed portion to achieve connection.

[0018] In one embodiment, the fan head further includes: an inner cylinder, which is arranged inside the fan housing and is spaced from its inner wall;

[0019] Wherein, a motor is installed in the inner cylinder, and one end of the motor is connected to the impeller, so that when the motor drives the impeller to rotate, air is discharged through the air flow channel between the fan housings.

[0020] In one embodiment, a partition is provided inside the inner cylinder, and the partition is used to divide the inner cylinder into a first part and a second part;

[0021] Wherein, a mounting shaft protrudes in the first part, the motor is installed on the mounting shaft, and the flow - guiding cover is installed in the second part.

[0022] In one embodiment, the fairing has a hollow structure with one end being an open end and the other end being the sealed end. The open end has a caulking end formed by contraction, and the caulking end is caulked with the second part through a third engaging structure;

[0023] Wherein, the third engaging structure includes a plurality of third recesses formed on the side wall of the second part and a plurality of third protrusions protruding from the outer wall of the caulking end;

[0024] When installing the fairing, the caulking end of the fairing extends into the second part and the third protrusions are snapped into the third recesses to achieve connection.

[0025] In one embodiment, the fan head further includes:

[0026] Fixed guide vanes, a plurality of the fixed guide vanes are arranged at intervals between the inner cylinder and the inner wall of the fan housing. Each of the fixed guide vanes has a sheet-like structure and its length direction extends along the axial direction of the fan housing. One end of each of the fixed guide vanes extends at the air outlet;

[0027] Wherein, the width of each of the fixed guide vanes gradually narrows from the inner cylinder towards the air outlet direction and is arc-shaped, and the arc-shaped sides of each of the fixed guide vanes are spaced from the fairing;

[0028] The ratio of the length of the fan blade to the length of the fixed guide vane is less than or equal to 1:2 to enhance the focusing of the air flow inside the air flow passage.

[0029] In one embodiment, the impeller includes a hub, a plurality of fan blades connected to the hub, and a rotating shaft connected to the hub;

[0030] Wherein, the rotating shaft is used to connect to the motor, and the ratio of the diameter of the magnetic ring of the motor to the length of the fan blade is greater than or equal to 2:1 to reduce the gyroscopic effect of the handheld fan.

[0031] In one embodiment, the gap between the fan blade and the inner wall of the fan housing is less than 1.6 mm, and the inner diameter of the air outlet is less than the diameter of the air flow passage formed inside the fan housing to achieve air flow aggregation inside the air flow passage.

[0032] The above-mentioned fan head for a handheld fan, on the one hand, through the radial contraction design of the air outlet cover, its outer wall forms an arc transition structure with the fan housing, eliminating the air flow separation phenomenon at the traditional right-angle joint. Thus, combined with the arc-shaped sealing end that is recessed in the air guide cover, the air outlet flow is directed out along a continuous curvature path. On the other hand, through the sealing end of the air guide cover being recessed into the air outlet, an embedded air guide cavity is formed, forcing the air flow to complete streamline integration before leaving the air outlet, solving the technical problem in the prior art that the air is prone to generate secondary eddies due to sudden pressure changes, resulting in high-frequency whistling. Therefore, the eddies and noise generated at the air outlet are greatly reduced, making the fan have no obvious gyroscopic effect and providing a more comfortable user experience.

[0033] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments of this application. Obviously, the following described drawings are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the drawings.

[0035] Figure 1 It is a schematic structural diagram of the handheld fan with a base of the present invention.

[0036] Figure 2 is Figure 1 a schematic structural diagram of the handheld fan from another angle in

[0037] Figure 3 is Figure 2 a rear view of the handheld fan in

[0038] Figure 4 is Figure 2 a side view of the handheld fan in

[0039] Figure 5 is Figure 2 a sectional view of the handheld fan in

[0040] Figure 6 is Figure 2 an exploded view of the handheld fan in

[0041] Figure 7 is Figure 2 another exploded view of the handheld fan in

[0042] Figure 8 It is an exploded view of the fan housing and the handle of the handheld fan of the present invention.

[0043] Figure 9 isFigure 8 Cross-sectional view of the middle fan housing and the first housing.

[0044] Figure 10 Is Figure 8 Another cross-sectional view of the middle fan housing and the first housing.

[0045] Figure 11 Side view of the motor and impeller of the handheld fan of the present invention.

[0046] Figure 12 Schematic structural view of the first embodiment of the base of the present invention.

[0047] Figure 13 Is Figure 12 Front view of

[0048] Figure 14 Is Figure 13 Top view of

[0049] Figure 15 Is along Figure 14 Cross-sectional view taken along line A-A in

[0050] Figure 16 Is along Figure 14 Cross-sectional view taken along line B-B in

[0051] Figure 17 Is Figure 12 Exploded view of

[0052] Figure 18 Is Figure 12 Another exploded view from a different angle of

[0053] Figure 19 Schematic structural view of the second embodiment of the base of the present invention.

[0054] Figure 20 Is Figure 19 Cross-sectional view of

[0055] Figure 21 Schematic view of a usage state of the handheld fan with a base of the present invention.

[0056] Figure 22 Is Figure 21 Cross-sectional view of

[0057] Figure 23 Schematic view of another usage state of the handheld fan with a base of the present invention. Detailed implementation manners

[0058] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements. The present invention aims to provide a handheld fan 1 with a base, which includes a handheld fan 100 and a base 200. The handheld fan 100 can be used independently by hand or inserted into the base 200 and placed on a table or desktop for use. Moreover, when the handheld fan 100 is inserted into the base 200 for use, the air outlet angle of the handheld fan 100 can be conveniently and quickly adjusted, thereby providing a better user experience and usage effect.

[0059] In addition, the handheld fan 100 provided by the present invention has a smaller volume compared with existing handheld fans. Specifically, the length L of the handheld fan 100 is less than or equal to 162.5 mm, the width W is less than or equal to 50.5 mm, and the thickness H is less than or equal to 52.5 mm, as shown in Figure 3-4 shown. Compared with common handheld fans on the market currently (the length is generally not less than 200 mm and the width is generally not less than 100 mm), the handheld fan 100 of the present invention is more compact in size, lighter in weight, and more convenient to carry.

[0060] It should be noted that for the handheld fan 1 with a base of the present invention, the size of the handheld fan 100 is not limited to the above numerical range. Of course, its size range can be set otherwise according to needs. And for handheld fans 100 of any other sizes, they can all cooperate with the corresponding base 200 to achieve the adjustment of the air outlet angle.

[0061] The following will Figure 1-23 be described in detail with reference to the accompanying drawings, the structures of the handheld fan 100 and the base 200 in the present invention.

[0062] First, with reference to Figure 1-Figure 5 shown, the handheld fan 100 provided by the present invention includes a fan head 110, a handle 120, a motor 130, an impeller 140, a power source 150, and a control component 160. Among them, the fan head 110 is integrally in a long cylindrical structure with air inlets 1111 and air outlets 1112 formed at both ends. The motor 130 and the impeller 140 are installed inside the fan head 110 and are connected. The motor 130 is used to drive the impeller 140 to rotate. The impeller 140 faces the air inlet 1111, and there is a certain distance between the impeller 140 and both the air inlet 1111 and the air outlet 1112. That is, the impeller 140 is housed inside the long cylindrical fan head 110 without being exposed. During use, it is difficult for fingers or sundries to touch the fan blades, and it is safer and more reassuring to use. The upper end of the handle 120 is connected to approximately the middle of the fan head 110, and the lower end of the handle 120 forms a plug-in end adapted to the base (details will be described later); the power source 150 and the control component 160 are respectively arranged inside the handle 120 and are electrically connected to the motor 130.

[0063] The following will be described in conjunction withFigure 5-Figure 7 , Figure 11 As shown, in the present invention, the impeller 140 includes a hub 141, a plurality of fan blades 142 connected to the hub 141, and a rotating shaft 143 connected to the hub 141 (see Figure 6 ). The rotating shaft 143 is used to connect to the motor 130. Since the overall volume of the handheld fan 100 of the present invention and the volume of the fan head 110 are reduced compared with the existing handheld fans, the area of the fan blades 142 is correspondingly reduced, so that the problem of top-heavy when holding the handheld fan 100 will not occur. At the same time, in the present invention, a high-speed DC brushless outer rotor motor is adopted, specifically, a motor 130 with a speed of 4000 to 10,000 revolutions per minute is used to improve the air volume and air pressure, so as to achieve the purpose of increasing the air supply distance.

[0064] Continue to refer to Figure 11 As shown, in the present invention, the ratio of the magnetic ring diameter D3 (including the housing) of the motor 130 to the length L1 of the fan blade 142 is greater than or equal to 2:1, which is different from the ratio of the magnetic ring diameter (including the housing) of the motor of the traditional axial-flow handheld fan to the length of the fan blade being less than or equal to 1:3, so that the handheld fan 100 of the present invention can greatly reduce the gyroscopic effect.

[0065] Refer to Figure 5 As shown, in the present invention, the gap between the fan blade 142 and the inner wall of the fan housing 111 (see details later) of the fan head 110 is less than 1.6 mm. Combined with the high speed of the motor 13, ultra-high air pressure is achieved, so the air supply distance is farther.

[0066] Continue to refer to Figure 5-Figure 7, the fan head 110 includes a fan housing 111, fixed guide vanes 112, a flow deflector 113, an air inlet cover 114, and an air outlet cover 115. Among them, the fan housing 111 has a long cylindrical structure, and the air inlet 1111 and the air outlet 1112 are respectively formed at both ends. The air inlet cover 114 is installed at the air inlet 1111, and the air outlet cover 115 is snap-connected to one end of the air outlet 1112. An inner cylinder 116 spaced from the inner wall is further provided inside the fan housing 111, and the motor 130 is installed in the inner cylinder 116. The long cylindrical fan housing 111 makes the air inlet cover 114 and the air outlet cover 115 farther away from the fan blades 142, making it more difficult for fingers or sundries to contact the fan blades 142, and the use is safer and more reassuring. A plurality of fixed guide vanes 112 are radially spaced between the inner cylinder 116 and the inner wall of the fan housing 111. One end of each fixed guide vane 112 extends to the air outlet 1112. The diversion structure formed by the fixed guide vanes 112 can make the air outlet converge, thereby increasing the air pressure and wind speed and making the air supply distance farther. The flow deflector 113 has a hollow structure with one end open and the other end sealed. The open end of the flow deflector 113 is connected to the inner cylinder 116, and the sealed end of the flow deflector 113 is located at the air outlet 1112 and has an arc-shaped structure. The setting of the flow deflector 113 can not only isolate the internal noise generated during the operation of the fan 100 to achieve a noise reduction effect, but also has the function of reducing eddy currents, and at the same time makes the appearance of the handheld fan 100 more beautiful.

[0067] Continuing to combine Figure 3 , Figure 5-Figure 7 As shown, the air inlet cover 114 has a plurality of uniformly arranged and curved air inlet guide vanes 1141, and the bending direction of each air inlet guide vane 1141 is opposite to the rotation direction of the impeller 140. Refer to Figure 3 , the setting of the air inlet guide vanes 1141 makes the air resistance smaller and the air inlet smoother. Of course, the air inlet cover 114 is not limited to the structural setting of the air inlet guide vanes 1141. For example, in other embodiments, the air inlet cover 114 can be set in a grid shape, a honeycomb shape, or other shapes.

[0068] In the present invention, the air inlet cover 114 and the fan housing 111 are snap-connected through a first snap structure. Specifically, the first snap structure includes a plurality of first recessed portions 1142 recessed on the side wall of the air inlet cover 114 (refer to Figure 6 shown) and a plurality of first protruding portions 1113 protruding on the inner wall of the fan housing 111 (refer to Figure 8As shown, the shape and size of the first protrusion 1113 are adapted to the first recess 1142. Among them, the first recess 1142 can be a groove, a through hole, etc., and the first protrusion 1113 can be a bump, a rib, etc. When the air inlet cover 114 is installed, its side wall extends into one end of the air inlet 1111 of the fan housing 111 and makes the first recess 1142 on it engage with the first protrusion 1113. Understandably, the installation positions of the first protrusion 1113 and the first recess 1142 can be interchanged.

[0069] Next, in conjunction with Figure 5-11 As shown, further, one end of the air outlet 1112 of the fan housing 111 converges to form an air outlet end, so that the inner diameter D1 of the air outlet 1112 is smaller than the diameter D2 of the air flow channel formed in the fan housing 111 (see Figure 9 ), thereby increasing the air pressure through volume compression, and the volume compression is at one end of the axial air outlet 1112, which is more conducive to air flow aggregation, thereby increasing the air supply distance.

[0070] In addition, the air outlet cover 115 has an annular structure, and the air outlet cover 115 is engaged with the air outlet end through a second engaging structure, and an arc transition is formed between the air outlet cover 115 and the outer wall of the fan housing 111, as Figure 5 shown. Specifically, the second engaging structure includes a plurality of second recesses 1151 recessed on the inner wall of the air outlet cover 115 (as Figure 7 shown) and a plurality of second protrusions 1114 protruding on the outer wall of the air outlet end (as Figure 8 shown). The shape and size of the second protrusion 1114 are adapted to the second recess 1151. Among them, the second recess 1151 can be a groove, a through hole, etc., and the second protrusion 1114 can be a bump, a rib, etc. When the air outlet cover 115 is engaged with the air outlet end, the second protrusion 1114 is engaged in the second recess 1151 to achieve connection. Of course, the installation positions of the second protrusion 1114 and the second recess 1151 can be interchanged.

[0071] Continuing to combine Figure 5-Figure 6 、 Figure 9-10 As shown, each fixed guide vane 112 has a flat sheet-like structure and its length direction extends along the axial direction of the fan housing 111. The width of the fixed guide vane 112 gradually narrows from the inner cylinder 116 towards the air outlet 1112 and is arc-shaped. The arc edge 1121 of the fixed guide vane 112 is slightly spaced from the flow guide cover 113. In the present invention, the ratio of the length L1 of the fan blade 142 to the length of the fixed guide vane 112 is less than or equal to 1:2. Therefore, when the air flow rotates and flows out of the fan housing 111, effective viscosity is formed, greatly improving the focusing effect of the air flow and achieving a super-long blowing distance.

[0072] Continuing to combine Figure 5-Figure 7 、 Figure 9-10As shown, a partition plate 1161 is further provided inside the inner cylinder 116. The partition plate 1161 divides the inner cylinder 116 into a first part 116a and a second part 116b. Among them, a mounting shaft 1162 is convexly provided in the first part 116a. The mounting shaft 1162 is specifically integrally formed with the partition plate 1161, and the motor 130 is mounted on the mounting shaft 1162. The flow guide cover 113 is mounted in the second part 116b.

[0073] Specifically, the open end of the flow guide cover 113 has a caulking end formed by contraction. The outer diameter of the caulking end corresponds to the inner diameter of the second part 116b, and the caulking end and the second part 116b are caulked through a third engaging structure. Specifically, the third engaging structure includes a plurality of third recessed portions 1163 (see Figure 9-10 ) opened on the side wall of the second part 116b and a plurality of third protruding portions 1131 (see Figure 7 ) protruding from the outer wall of the caulking end. In this embodiment, the third recessed portion 1163 is a through hole. Of course, it is not limited to this. It is also feasible to start it as a groove. The third protruding portion 1131 is a convex block adapted to the aforementioned through hole. Of course, it can also be set as a convex rib, etc., as long as it can be firmly caulked with the third recessed portion 1163. When installing the flow guide cover 113, the caulking end of the flow guide cover 113 extends into the second part 116b and the third protruding portion 1131 is snapped into the third recessed portion 1163 to achieve connection. See Figure 5 shown.

[0074] Refer to again Figure 5-Figure 7 、 Figure 9 shown, a connecting column 117 with a hollow structure is further provided inside the fan head 110. One end of the connecting column 117 extends radially outward to form an abutting portion 1171. An installation hole 1115 communicating with the inside of the handle 120 is opened on the fan housing 111. The connecting column 117 passes through the installation hole 1115, and the abutting portion 1171 abuts against the outer wall of the fan housing 111. The other end of the connecting column 117 protrudes into the first part 116a of the inner cylinder 116. See Figure 5 . By using the connecting column 117 for wiring, the wires are prevented from being exposed, ensuring the safety and aesthetics of the hand-held fan 100.

[0075] Combined with Figure 1-Figure 5 shown, in the present invention, the plugging end 120a formed at the lower end of the handle 120 is hemispherical. When the plugging end 120a of the handle is plugged into the base 200, it can rotate 360° along the base 200, making the use of the hand-held fan 100 more convenient. Moreover, through the cooperation of the plugging end 120a and the base 200, the air outlet angle of the hand-held fan 100 can be adjusted (details will be described later).

[0076] Combined with Figure 5-8As shown, in the present invention, the handle 120 includes a first housing 121 and a second housing 122 that are detachably snapped together. The first housing 121 is connected to the fan housing 111. In one embodiment, the first housing 121 and the fan housing 111 are integrally formed. Of course, this is not limited to this forming method. Connecting them together after separate forming does not affect the realization of their functions. After the second housing 122 is connected to the first housing 121, a first accommodation space is formed between the first housing 121 and the second housing 122. The power supply 150 and the control component 160 are both accommodated in the first accommodation space.

[0077] More specifically, the first housing 121 and the second housing 122 are snapped together through a fourth snap structure. The fourth snap structure includes a fourth recess and a fourth protrusion. And, one of the first housing 121 and the second housing 122 further protrudes with a snap piece. The fourth recess is opened on the snap piece, and the fourth protrusion is provided on the other of the first housing 121 and the second housing 122 and is matched with the fourth recess. Through the detachable snap connection between the fourth protrusion and the fourth recess, the detachable connection between the first housing 121 and the second housing 122 is realized.

[0078] Continuing to refer to Figure 5-10 As shown, in one embodiment, the first housing 121 is provided with a key hole 1211 communicating with its interior, and a plurality of snap pieces 1212 protrude from the edge of the side wall of the first housing 121. A fourth recess 1213 is opened on the snap piece 1212. The fourth recess 1213 is specifically a snap hole, but is not limited thereto. Correspondingly, the second housing 122 is provided with a charging hole 1221 communicating with its interior. At the same time, a groove 1222 is provided on the inner wall of the second housing 122. The shape and size of the groove 1222 correspond to the snap piece 1212. A fourth protrusion 1223 is provided in the groove 1222. The fourth protrusion 1223 is preferably a protrusion. When the first housing 121 and the second housing 122 are snapped together, the snap piece 1212 extends into the groove 1222 and the fourth protrusion 1223 is snapped into the fourth recess 1213 to achieve connection.

[0079] Referring again to Figure 5-Figure 7 As shown, the control component 160 includes a key 161, a first charging interface 162 and a circuit board 163. The control component 160 is installed in the handle 120. The key 161 protrudes into the key hole 1211, and the first charging interface 162 protrudes into the charging hole 1221. The power supply 150 is accommodated in the handle 120 at the lower end of the handle 120. The power supply 150 is used to supply power to the circuit board 163 and the motor 130. Among them, the principles and setting methods of the power supply 150 and the control component 160 are conventional setting methods well-known to those of ordinary skill in the art, so no further details will be given.

[0080] Referring again toFigure 2 As shown, more preferably, a first charging structure 170 for charging the power supply is further provided at the bottom of the handle 120. A through hole (not labeled) is formed at the bottom of the plug end 120a, and the first charging structure 170 is disposed in the through hole and exposed from the handle 120. Specifically, the first charging structure 170 includes a first metal sheet 171 and a second metal sheet 172. Among them, the first metal sheet 171 is circular ring-shaped, and the second metal sheet 172 is circular. The first metal sheet 171 is installed in the aforementioned through hole, and the second metal sheet 172 is inserted through the first metal sheet 171 and is insulated from it. The first metal sheet 171 and the second metal sheet 172 are respectively electrically connected to the power supply 150. After the handle 120 is plugged into the base 200, the first metal sheet 171 and the second metal sheet 172 can contact and conduct with the charging spring pins 242 (see the following description) on the base 200, so as to charge the power supply 150 through the base 200, and it can be ensured that the handle 120 rotates 360° in the base 200 without interference, making the usage mode of the handheld fan 100 more diversified and more convenient.

[0081] It can be understood that the first metal sheet 171 and the second metal sheet 172 are not limited to the above-mentioned nested structure. As long as it is ensured that the two can contact the charging spring pins 242 on the base 200 and the contact surfaces of the two are continuous planes, the charging and free rotation of the handheld fan 100 can be realized.

[0082] Combined with the above description, it can be known that the handheld fan 100 of the present invention can be charged through the first charging interface 162 on the handle 120, or can be charged by the cooperation of the first charging structure 170 at the bottom of the handle 120 and the base 200, and the usage mode is more diverse and more convenient.

[0083] Next, in conjunction with Figure 12-Figure 23 As shown, different embodiments of the base 200 of the present invention will be described separately.

[0084] First, refer to Figure 12-Figure 16 As shown, in the first embodiment of the base 200 of the present invention, a plug-in slot 210 formed by downward depression is provided on the base 200. The plug-in slot 210 includes a first plug-in portion 211 located below and a second plug-in portion 212 located above. Refer to Figure 15 As shown. Among them, the first plug-in portion 211 is hemispherical and adapted to the plug end 120a of the handle 120, and the first plug-in portion 211 is inclined. Specifically, the center line P2 of the first plug-in portion 211 forms a second included angle a2 with the vertical direction, that is, there is a second included angle a2 between the center line P2 of the first plug-in portion 211 and the center line P1 of the base 200. The second included angle a2 can be flexibly set as needed but should not be too large to prevent the handle from tilting along the first abutting surface 2121 after being inserted into the base 200.

[0085] As shown Figure 15 in the figure, the second insertion part 212 is gradually expanded upward from the upper end of the first insertion part 211, and the second insertion part 212 has opposite first abutting surface 2121 and second abutting surface 2122. The height of the first abutting surface 2121 is greater than the height of the second abutting surface 2122, that is, the distance from the top of the first abutting surface 2121 to the top of the first insertion part 211 is greater than the distance from the top of the second abutting surface 2122 to the top of the first insertion part 211. And, the first abutting surface 2121 is inclined relative to the vertical direction and has a first included angle a1. Specifically, the first abutting surface 2121 is gradually inclined from its bottom to the top and away from the center line P1 of the base 200. The first included angle a1 can also be flexibly set as needed and should not be too large to prevent the handle 120 from tilting along the first abutting surface 2121 after being inserted into the base 200. In the present invention, the first included angle a1 and the second included angle a2 are substantially the same and preferably between 5° and 15°, of course, but not limited to the above angles.

[0086] In a specific embodiment of the present invention, both the first included angle a1 and the second included angle a2 are set to 7.5°. In this way, both the stability of the handle 120 after being inserted into the base 200 can be ensured, and the adjustment of the air outlet angle of the hand-held fan 100 can be realized.

[0087] In addition, in this specific embodiment, the second abutting surface 2122 is slightly inclined outward relative to the vertical direction or extends substantially along the vertical direction, but is not limited to the setting method here. For example, in other embodiments, the second abutting surface 2122 can also be inclined relative to the vertical direction and close to the first abutting surface 2121 or away from the second abutting surface 2122, that is, the second abutting surface 2122 is inclined towards the direction where the first abutting surface 2121 is located or away from the first abutting surface 2121.

[0088] As shown Figure 12-17 in the figure, further, an arc-shaped guiding part 213 is formed between the top of the outer wall of the base 200 and the top of the second insertion part 212. The guiding part 213 is gradually expanded upward and outward from the top of the second insertion part 212. Through the setting of the arc-shaped guiding part 213, it is easier for the hand-held fan to be inserted into the insertion slot 210 from any angle, thereby increasing the convenience of use.

[0089] Combined with Figure 12-17 、 Figure 21-23As shown, when the handheld fan 100 is plugged into the base 200, the plugging end 120a of the handle 120 is received in the first plugging portion 211 of the plugging slot 210. At the same time, the first housing 121 or the second housing 122 of the handle 120 abuts against the first abutting surface 2121 of the second plugging portion 212. That is, the handle 120 is inclined along the first abutting surface 2121, so that the handle 120 has a first included angle a1 with respect to the vertical direction (i.e., the center line P1 of the base 200), thereby causing the handheld fan 100 to tilt forward or backward by 7.5°, so that the air outlet direction has an angle adjustment range of about 7.5 degrees up and down.

[0090] Specifically refer to Figure 21-22 As shown, it shows a schematic diagram of the handheld fan 100 being plugged into the base 200 in the forward direction. That is, the plugging end 120a of the handle 120 is received in the first plugging portion 211, and the second housing 122 of the handle 120 abuts against the first abutting surface 2121 of the second plugging portion 212, causing the handheld fan 100 to tilt backward by 7.5 degrees. At the same time, the plugging end 120a of the handle 120 can prevent the handheld fan 100 from tipping backward under the abutment of the first plugging portion 211, thereby causing the air outlet direction F of the handheld fan 100 to tilt upward with respect to the horizontal direction. Similarly, the state when the handheld fan 100 is plugged into the base 200 in the reverse direction can be referred to Figure 23 As shown, at this time, the first housing 121 of the handle 120 abuts against the first abutting surface 2121 of the second plugging portion 212, so that the air outlet of the handheld fan 100 tilts downward, that is, the air outlet direction F of the handheld fan 100 tilts downward with respect to the horizontal direction.

[0091] Combined again with Figure 12-Figure 18 As shown, in the present invention, the overall shape of the base 200 is not specifically limited, and its shape can be flexibly set to make the base 200 have a good appearance.

[0092] Refer to Figure 17-18 As shown, in this embodiment, the base 200 includes an upper housing 220 and a lower housing 230 that are snap-connected; wherein, the plugging slot 210 is formed in the upper housing 220, and the lower housing 230 is used to support on a desktop or a tabletop. Specifically, the upper housing 220 has an outer side wall 221 and an inner side wall that are spaced apart. The inner side wall is the side wall of the plugging slot 210. The top end of the outer side wall 221 of the upper housing 220 and the top end of the inner side wall are arc-transitioned to form the guiding portion 213. At the same time, the outer side wall 221 of the upper housing 220 has an outwardly convex arc structure, and the outer side wall 221 can be in a regular shape or an irregular shape. This structural setting of the upper housing 220 makes the shape of the base 200 more beautiful.

[0093] In this embodiment, the lower housing 230 includes a bottom plate 231 and side plates 232 connected to the bottom plate 231. The outer diameter of the side plates 232 corresponds to the inner diameter of the upper housing 220. The bottom plate 231 has a planar structure, which can ensure that the base 200 can be stably placed on a table or a countertop. When the upper housing 220 and the lower housing 230 are installed, the side plates 232 of the lower housing 230 extend into the upper housing 220, and the upper housing 220 and the lower housing 230 are fixedly connected by screws. Of course, the upper housing 220 and the lower housing 220 can also be connected in other ways. For example, they can be snap-connected through a matching recess and protrusion.

[0094] More preferably, anti-slip feet 233 can be further provided on the bottom plate 231 of the lower housing 230. Through the arrangement of the feet 233, the base 200 can be placed more stably on a table or a countertop.

[0095] Referring again to Figure 15-Figure 17 As shown, a second charging structure 240 can be further provided in the base 200. The second charging structure 240 is used to charge the hand-held fan 100 plugged into the base 200. Specifically, the second charging structure 240 includes a charging circuit board 241, charging spring pins 242, and a second charging interface 243. The charging spring pins 242 are connected to the charging circuit board 241, and the diameter of the charging spring pins 242 is less than 1 mm and has a telescopic amount of 3 mm. Of course, the diameter and the telescopic amount of the charging spring pins 242 are not limited to this. The charging spring pins 242 protrude into the aforementioned plug-in slot 210 and form a second included angle a2 with the vertical direction, that is, the charging spring pins 242 also form a 7.5° angle with the vertical direction (or with the center line P1 of the base 200). In this way, when the handle 120 of the hand-held fan 100 is inserted into the plug-in slot 210, the first metal sheet 171 and the second metal sheet 172 at the bottom of the handle 120 respectively contact the two charging spring pins 242 and press down the two charging spring pins 242 to conduct the charging circuit. Therefore, the hand-held fan 100 is charged through the base 200 connected to an external power source.

[0096] In this embodiment, a second accommodation space is formed between the upper housing 220 and the lower housing 230 of the base 200, and a through hole (not labeled, refer to Figure 15 ) communicating the second accommodation space and the plug-in slot 210 is provided at the bottom of the upper housing 220. The charging circuit board 241 is fixed in the second accommodation space and forms a 7.5° angle with the horizontal direction, so that the charging spring pins 242 pass through the through hole and protrude into the plug-in slot 210 and form a 7.5° angle with the vertical direction. At the same time, a through hole is also provided on the outer side wall 221 of the upper housing 220, and the second charging interface 243 is installed in the through hole and electrically connected to the charging circuit board 241.

[0097] Combined with the above description, since the bottom of the handle 120 is provided with the first metal sheet 171 and the second metal sheet 172, when the handle 120 is inserted into the insertion slot 210, the handle 120 can rotate 360° within the base 200, and it can ensure that the two charging pins 242 are always in conduction with the first metal sheet 171 and the second metal sheet 172 to achieve charging.

[0098] Referring to Figure 19-Figure 20 As shown, in the second embodiment of the base 200 of the present invention, compared with the above two embodiments, the setting method of the insertion slot 210 is exactly the same, and the second charging structure 240 is optionally provided, so it will not be described again. The difference lies only in: the outer shape of the base 200.

[0099] In this embodiment, the top of the upper housing 220 has an extension portion 222 extending radially along it. The extension portion 222 has an inclined planar structure. The extension portion 222 is formed by extending radially outward and upward along the outer edge of the guiding portion 213, as Figure 20 shown, and, a reinforcing rib 223 is further convexly provided on the lower surface of the extension portion 222. The lower housing 230 has a cylindrical structure, which has a bottom plate 231 with a planar structure and outer side walls 232 and inner side walls 233 connected to the bottom plate 231 and spaced apart. During installation, the upper housing 220 is accommodated in the lower housing 230 and the reinforcing rib 223 abuts against the inner side wall 233. At the same time, the extension portion 222 and the outer side wall 221 are mutually clamped to achieve connection, and the bottom plate 231 can ensure that the base 200 stably supports the hand-held fan 100.

[0100] In summary, for the handheld fan 1 with a base according to the present invention, firstly, since the insertion slot 210 provided on the base 200 has a first insertion portion 211 in the shape of a hemisphere and a second insertion portion 212 that gradually expands upward, and the second insertion portion 212 has opposite first abutting surfaces 2121 and second abutting surfaces 2122, and the first abutting surface 2121 is inclined relative to the vertical direction and has a first included angle a1. Therefore, when the handle 120 is inserted into the insertion slot 210, the handle 120 abuts against the first abutting surface 2121 of the second insertion portion 212 and is inclined relative to the vertical direction, so that the air outlet direction of the handheld fan 100 also forms an included angle relative to the horizontal direction, that is, the air outlet direction of the handheld fan 100 can be adjusted upward or downward, thereby realizing the rapid adjustment of the air outlet direction. Secondly, a plurality of fixed guide vanes 112 are provided at intervals at one end of the air outlet 1112 of the fan housing 111 of the handheld fan 100, and the inner diameter D1 of the air outlet 1112 is smaller than the diameter D2 of the air flow passage formed in the fan housing 111. Therefore, the air pressure can be increased by volume compression, and the volume compression is at one end of the air outlet 1112, which is more conducive to the aggregation of air flow, thereby increasing the blowing distance; in addition, a flow guide cover 113 with a hollow structure is provided at the air outlet 1112, and the sealed end of the flow guide cover 113 is located at the air outlet 1112 and has an arc structure. The flow guide cover 113 can greatly reduce eddy currents and noise, so that the fan has no obvious gyroscopic effect and the use experience is more comfortable; furthermore, the fan housing 111 has a long cylindrical structure, so that the fan blades 142 are located inside the fan housing 111 and are far from the air inlet 1111 and the air outlet 1112. Therefore, it is more difficult for fingers or sundries to contact the fan blades 142, and the use is safer and more reassuring; finally, the overall size of the handheld fan 100 is reduced, the weight is light, the grip feeling is better, and it is more convenient to carry.

[0101] Other partial structures involved in the handheld fan 1 with a base according to the present invention are all conventional structures well known to those of ordinary skill in the art, and will not be described in detail herein.

[0102] The foregoing disclosure is only the preferred embodiment of the present invention, and of course cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A fan head of a hand-held fan, characterized in that, The fan head includes: A fan housing, which is in a long cylindrical structure and has an air outlet formed at one end; An air outlet cover, which is in an annular structure and is snap-fitted to the air outlet, and the outer diameter of the air outlet cover is radially contracted to form an arc transition structure with the outer wall of the fan housing; A deflector, which is installed at the air outlet and has a sealed end formed at the outer end. The sealed end is in an arc structure and is recessed into the air outlet, so as to cooperate with the air outlet cover to reduce the eddy current and noise generated at the air outlet when the fan head discharges air.

2. The fan head according to claim 1, wherein The fan head further includes: an air inlet cover, which is installed at the air inlet located at the other end of the fan housing; Wherein, the air inlet cover has a plurality of uniformly arranged and curved air inlet guide vanes, and the bending directions of the air inlet guide vanes are opposite to the rotation direction of the impeller; or, the air inlet cover is arranged in a grid shape or a honeycomb shape.

3. The fan head according to claim 2, characterized in that, The air inlet cover is snap-fitted to the fan housing through a first snap-fitting structure. The first snap-fitting structure includes a plurality of first recessed portions recessed on the side wall of the air inlet cover and a plurality of first protruding portions protruding on the inner wall of the fan housing; Wherein, the shape and size of the first protruding portion are both matched with the first recessed portion, so that when installing the air inlet cover, the side wall of the air inlet cover extends into one end of the air inlet and the first recessed portion is snap-fitted with the first protruding portion.

4. The fan head according to claim 1, characterized in that, The air outlet cover is snap-fitted to one end of the air outlet through a second snap-fitting structure; Wherein, the second snap-fitting structure includes a plurality of second recessed portions recessed on the inner wall of the air outlet cover and a plurality of second protruding portions protruding on the outer wall of the air outlet. The shape and size of the second protruding portion are both adapted to the second recessed portion; When the air outlet cover is snap-fitted to the air outlet, the second protruding portion is snap-fitted into the second recessed portion to achieve connection.

5. The fan head according to claim 1, wherein, The fan head further includes: an inner cylinder, which is arranged inside the fan housing and is spaced from its inner wall; Wherein, a motor is installed in the inner cylinder, and one end of the motor is connected to the impeller, so that when the motor drives the impeller to rotate, air outlet is realized through the air flow channel between the fan housings.

6. The fan head according to claim 5, characterized in that, A partition is arranged in the inner cylinder, and the partition is used to divide the inner cylinder into a first part and a second part; Wherein, a mounting shaft protrudes in the first part, the motor is installed on the mounting shaft, and the deflector is installed in the second part.

7. The fan head according to claim 6, characterized in that, The deflector is in a hollow structure with an open end at one end and the sealed end at the other end. The open end has a snap-fitting end formed by contraction, and the snap-fitting end is snap-fitted to the second part through a third snap-fitting structure; Wherein, the third snap-fitting structure includes a plurality of third recessed portions opened on the side wall of the second part and a plurality of third protruding portions protruding on the outer wall of the snap-fitting end; When installing the deflector, the snap-fitting end of the deflector extends into the second part and the third protruding portion is snapped into the third recessed portion to achieve connection.

8. The fan head according to claim 5, characterized in that, The fan head further includes: The stationary guide vanes, a plurality of the stationary guide vanes are arranged at intervals between the inner cylinder and the inner wall of the fan housing, each of the stationary guide vanes is in a sheet structure and its length direction extends along the axial direction of the fan housing, and one end of each of the stationary guide vanes extends to the air outlet; Wherein, the width of each of the stationary guide vanes gradually narrows from the inner cylinder towards the air outlet direction and is arc-shaped, and the arc-shaped edges of each of the stationary guide vanes are spaced apart from the flow guide cover; The ratio of the length of the fan blade to the length of the stationary guide vane is less than or equal to 1:2 to enhance the focusing of the air flow inside the air flow channel.

9. The fan head according to claim 5, characterized in that, The impeller includes a hub, a plurality of fan blades connected to the hub and a rotating shaft connected to the hub; Wherein, the rotating shaft is used to be connected to the motor, and the ratio of the diameter of the magnetic ring of the motor to the length of the fan blade is greater than or equal to 2:1 to reduce the gyroscopic effect of the hand-held fan.

10. The fan head according to claim 9, wherein, The gap between the fan blade and the inner wall of the fan housing is less than 1.6 mm, and the inner diameter of the air outlet is less than the diameter of the air flow channel formed in the fan housing to achieve air flow aggregation in the air flow channel.

Images