CN216518755U - Fan structure and hand-held fan with hidden fan blades - Google Patents

Abstract

The utility model provides a fan structure which is suitable for a handheld fan and comprises a support, a brushless motor assembly and a fan blade assembly, wherein the brushless motor assembly and the fan blade assembly are arranged in the support; the one end that the flabellum subassembly was kept away from to the support is provided with the mounting groove that is used for installing the battery, still is provided with the water conservancy diversion subassembly in the support, arranges according to predetermineeing the interval between water conservancy diversion subassembly and the flabellum subassembly. The utility model provides a hand-held fan with hidden fan blades. The hand-held fan with the hidden fan blades can effectively increase the area of an air duct, increase the air inlet volume, reduce noise and increase the integral air outlet volume, and is better in user experience.

Description

Fan structure and hand-held fan with hidden fan blades

Technical Field

The utility model relates to the technical field of handheld fans, in particular to a fan structure and a handheld fan with hidden fan blades.

Background

The existing fan blade hidden type handheld fan is characterized in that fan blades are hidden in a handle and blow upwards, the direction of air flow is changed by 90 degrees through an air outlet head structure, and air flow blowing towards a human body from the front side is formed at an air outlet. The air inlet can be arranged at the upper end of the handle or the air inlet is arranged at the lower end of the handle, but no matter the air inlet is arranged at the upper end or the lower end of the handle, the noise is higher. In addition, when the air inlet is arranged at the upper end of the handle, an air inlet hole is required to be formed in the upper part of the handle, and the air inlet is generally in a grid shape; in order to keep the strength of the handle, the opening rate is too low, so that the air inlet amount is easy to be small, and further the air outlet amount is small; secondly, the air inlet is arranged at the upper end of the handle, so that a user can block part of the air inlet when holding the handle, and the air quantity is influenced. When the air intake was when the lower extreme of handle, need all set up motor, battery, PCBA, button charge interface and other structures in the wind channel, and the resistance in the wind channel is too big to lead to the noise of product to be high, the amount of wind is little.

Therefore, there is a need to provide a concealed fan blade type handheld fan which can increase the air duct area, increase the air intake volume, reduce noise and increase the overall air output volume.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fan structure which can increase the area of an air duct to reduce noise and increase the whole air output.

Another objective of the present invention is to provide a hand-held fan with hidden blades, which can increase the air duct area, increase the air intake, reduce noise, and increase the overall air output.

In order to achieve the purpose, the utility model provides a fan structure which is suitable for a handheld fan and comprises a support, a brushless motor assembly and a fan blade assembly, wherein the brushless motor assembly and the fan blade assembly are arranged in the support; the one end that the flabellum subassembly was kept away from to the support is provided with the mounting groove that is used for installing the battery, still is provided with the water conservancy diversion subassembly in the support, arranges according to predetermineeing the interval between water conservancy diversion subassembly and the flabellum subassembly.

Preferably, the predetermined spacing is between 1.5 mm and 2.5 mm.

Preferably, the brushless motor assembly, the fan blade assembly and the flow guide assembly are coaxially arranged.

Preferably, the fan blade assembly comprises a fixing member sleeved on the brushless motor assembly, the fan blades on the fan blade assembly are arranged on the fixing member, and the outer diameter of the mounting groove is not greater than that of the fixing member.

Preferably, the fan blade assembly includes a plurality of fan blades, the guide assembly includes a plurality of guide vanes, and the spiral directions of the fan blades and the guide vanes are opposite.

Preferably, the clearance between the fan blade and the inner wall of the bracket is less than or equal to 1 mm.

Compared with the prior art, the fan structure is suitable for the handheld fan. The fan structure includes the support and installs brushless motor subassembly and the flabellum subassembly in the support, and the one end that the flabellum subassembly was kept away from to the support is provided with the mounting groove that is used for installing the battery, and the battery is the cylinder battery. The fan subassembly still includes the circuit subassembly, and the circuit subassembly is fixed in on the cylinder battery. The fan blade assembly, the brushless motor assembly, the support, the battery and the circuit assembly are of an integrated structure. The preset interval between the flow guide assembly and the fan blade assembly is between 1.5 millimeters and 2.5 millimeters, so that the noise of the fan blade can be effectively reduced, and the air volume can be increased. The fan assembly is of an integrated structure, and each part of the fan structure is effectively integrated, so that the air duct area is larger, and the wind resistance is smaller.

In order to achieve the other purpose, the utility model provides a hand-held fan with hidden fan blades, which comprises a shell and the fan structure, wherein the fan structure is arranged in the shell, and an air duct for supplying air is formed by the outer surface of the fan structure and the inner surface of the shell.

Preferably, the battery pack further comprises a circuit component and a fixing frame, wherein the circuit component abuts against the battery, the fixing frame is sleeved on the circuit component and is installed at the end part of the battery, and the circuit component and the battery are integrated by means of the fixing frame.

Preferably, the circuit assembly comprises a circuit board located in the fixing frame and a first convex part and a second convex part protruding out of the fixing frame, the first convex part is connected with a button, the second convex part is connected with a charging interface, the button and the charging interface are partially exposed out of the shell, and the circuit assembly and the battery are installed in the shell in a reinforcing mode through cooperation of the first convex part, the second convex part and the shell.

Preferably, the two sides of the fixing frame are provided with groove bodies for positioning and installing the circuit components, the circuit components are clamped in the groove bodies, and the first convex parts and the second convex parts protrude out of the fixing frame by means of the groove bodies.

Preferably, the two sides of the fixing frame are provided with first clamping portions matched with the shell, the first clamping portions and the first protruding portions or the second protruding portions are overlapped together in the air duct along the length direction of the air duct, the shell is provided with second clamping portions matched with the first clamping portions, and the connection between the fan structure and the shell is reinforced through the matching of the first clamping portions and the second clamping portions.

Preferably, the casing is internally provided with an installation part matched with the bracket, the installation part is recessed into the inner wall of the casing, the bracket is installed in the installation part, and the installation of the fan structure in the casing is reinforced by the installation part.

Preferably, the end part of the housing close to the bracket is provided with an air inlet component, the air inlet component comprises an air inlet cover which is detachably mounted on the housing, the air inlet cover is provided with a plurality of first air inlets, the plurality of first air inlets are in a grid shape, and the ratio of the height of the first air inlets to the length of the fan blades in the fan blade component is more than or equal to 0.9.

Preferably, the minimum distance between the end part of the first air inlet close to the fan blade assembly and the fan blade assembly is greater than or equal to 5 mm.

Preferably, an annular air outlet is formed in the end portion, away from the support, of the housing, the fan blade assembly comprises a fixing member and a plurality of fan blades arranged on the fixing member, an annular air supply area is formed between the fan blades and the fixing member when the fan blades rotate, and the ratio of the area of the air outlet to the air supply area ranges from 1:3 to 1: 2.

Preferably, be provided with a plurality of pressure boost stator in the air outlet, a plurality of pressure boost stator divide into a plurality of air-out portions with the air outlet even and equidistance.

Compared with the prior art, the fan structure and the shell of the hidden fan blade type handheld fan form an air channel, and the fan structure effectively integrates all parts, so that the area of the air channel is larger, and the wind resistance is smaller. The circuit component is fixed on the battery through the fixing frame in a clamping mode, and the circuit component is partially located in the fixing frame, so that resistance to the air duct is reduced. And the part of the circuit component protruding out of the shell can play a role of auxiliary support, so that the whole structure is more stable. In the fan structure, the preset interval between the flow guide assembly and the fan blade assembly is between 1.5 mm and 2.5 mm, so that the noise of the fan blade can be effectively reduced, and the air volume can be increased. On the other hand, the ratio of the height of the first air inlet to the length of the fan blades in the fan blade assembly is greater than or equal to 0.9, so that a sufficiently large air inlet amount can be maintained. The minimum distance between the end part of the first air inlet close to the fan blade assembly and the fan blade assembly is larger than or equal to 5 mm, and noise can be reduced. The ratio range between the area of the air outlet and the area of the air supply is 1:3 to 1:2 so as to effectively compress air and improve air pressure. Be provided with a plurality of pressure boost stator in the air outlet, can improve the wind pressure, increase air supply distance. The hand-held fan with the hidden fan blades can effectively increase the area of an air duct, increase the air inlet volume, reduce noise and increase the integral air outlet volume, and is better in user experience.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a structural diagram of a handheld fan with hidden fan blades according to an embodiment of the present invention.

Fig. 2 is an exploded view of the structure of fig. 1.

Fig. 3 is a view of the structure of fig. 1 from another angle.

Fig. 4 is a cross-sectional view of fig. 1.

Fig. 5 is a cross-sectional view at another angle from fig. 1.

Fig. 6 is a block diagram of the fan structure of fig. 1.

Fig. 7 is a cross-sectional view of fig. 6.

Fig. 8 is a structural view of the stent of fig. 6.

Fig. 9 is a view showing another angle of the structure of fig. 8.

FIG. 10 is a block diagram of the fan blade assembly of FIG. 6.

Fig. 11 is a structural view of the first housing in fig. 2.

Fig. 12 is a structural view of the second housing in fig. 2.

Fig. 13 is a structural view of the wiring board in fig. 6.

Fig. 14 is a structural view of the fixing frame of fig. 6.

Description of reference numerals:

100. a hand-held fan with hidden fan blades; 101. an air duct; 102. an air outlet;

10. a fan structure; 11. a support; 111. a flow guide assembly; 112. mounting grooves; 113. a fixed part; 114. a hollow cavity; 12. a brushless motor assembly; 121. a cover body; 122. a first mounting hole; 13. a fan blade assembly; 131. a fan blade; 132. a sheathing part; 133. a fixing member; 134. a second mounting hole; 14. a connecting assembly; 20. a housing; 201. an installation part; 202. a fitting portion; 203. a second engaging portion; 21. a first housing; 211. a supercharging guide vane; 212. clamping convex; 22. a second housing; 221. a clamping hole; 23. an air intake assembly; 231. an air inlet cover; 232. a first air inlet; 233. a second air inlet; 24. a fixing ring;

30. an electrical appliance structure; 31. a battery; 32. a line component; 321. pressing a key; 322. a charging interface; 323. A circuit board; 324. a first convex portion; 325. a second convex portion; 33. a fixed mount; 331. a first engaging portion; 332. an accommodating cavity; 333. a tank body.

Detailed Description

In order to explain technical contents and structural features of the present invention in detail, the following description is made with reference to the embodiments and the accompanying drawings.

Referring to fig. 1 to 5, the present invention provides a hand-held fan 100 with hidden fan blades, which includes a housing 20 and a fan structure 10 installed in the housing 20, wherein an air duct 101 for blowing air is formed by an outer surface of the fan structure 10 and an inner surface of the housing 20. The fan structure 10 of the present invention is suitable for a hand-held fan. The fan structure 10 includes a bracket 11, and a brushless motor assembly 12 and a fan blade assembly 13 mounted in the bracket 11. The holder 11 is provided with a hollow cavity 114 for accommodating the brushless motor assembly 12 and the fan blade assembly 13, the hollow cavity 114 is provided with a fixing portion 113 for mounting the brushless motor assembly 12, and the fixing portion 113 may be a protruding cylindrical structure. Illustratively, the brushless motor assembly 12 is sleeved on the fixing portion 113, and the fan blade assembly 13 is sleeved on the outer surface of the brushless motor assembly 12 and the inner portion thereof is connected to the fixing portion 113. Therefore, the bracket 11, the brushless motor component 12 and the fan blade component 13 are of an integrated structure, and the layout is reasonable and compact. On the other hand, an electrical structure 30 is further disposed in the air duct 101, and the electrical structure 30 includes a battery 31, a circuit assembly 32, and a fixing frame 33. The end of the bracket 11 away from the fan blade assembly 13 is provided with a mounting groove 112 for mounting the cylindrical battery 31, the mounting groove 112 is used for mounting the cylindrical battery 31, the slender cylindrical structure of the cylindrical battery 31 is more beneficial to the formation of the smooth air duct 101, and the area of the air duct 101 can be larger, and the wind resistance is smaller. The cylindrical battery 31 is mounted in the mounting groove 112, and the line assembly 32 is fitted with the fixing bracket 33 to be mounted at the other end of the cylindrical battery 31. In wind channel 101, fan structure 10 and electrical apparatus structure 30 are and are an organic whole and set up, and compact structure is reasonable, and fan structure 10 and electrical apparatus structure 30 cooperate to with whole wind channel 101 maximize, make the windage as little as possible.

Referring to fig. 6 to 10, in some alternative embodiments, a flow guiding assembly 111 is further disposed in the bracket 11, and the flow guiding assembly 111 and the fan blade assembly 13 are arranged at a predetermined interval. Wherein, flabellum subassembly 13 includes a plurality of fan blades 131, and water conservancy diversion subassembly 111 includes a plurality of guide vanes, and fan blade 131 is opposite with guide vanes's helical direction to can avoid resonating, noise abatement. Meanwhile, the spiral directions of the fan blades 131 and the guide vanes are opposite, so that more air can be sucked in the flow channel, and the wind power is increased. Illustratively, the predetermined distance between the flow guiding assembly 111 and the fan blade assembly 13 is between 1.5 mm and 2.5 mm. The distance between the flow guide assembly 111 and the fan blade assembly 13 is set between 1.5 mm and 2.5 mm, so that the noise of the fan blades can be effectively reduced, and the air volume is increased as much as possible. It can be understood that, when the fan structure 10 is started, a circulation flow is generated between the flow guide assembly 111 and the fan blade assembly 13 to form a pressure potential energy, and the distance between the flow guide assembly 111 and the fan blade assembly 13 is between 1.5 mm and 2.5 mm, so that the pressure potential energy is larger, and the air supply force is stronger.

Referring to fig. 4 or fig. 7, in some alternative embodiments, the brushless motor assembly 12, the fan blade assembly 13 and the airflow guiding assembly 111 are coaxially disposed. Brushless motor subassembly 12, flabellum subassembly 13 and the water conservancy diversion subassembly 111 that sets up with the axle center for whole fan structure 10 can be installed between two parties in shell 20, thereby makes whole wind channel 101 neatly symmetrical more, and the space in each region is roughly the same in the wind channel 101, thereby can be better supply air, and the air output is even, and the sensation of wind is experienced better.

Referring to fig. 6-10, in some alternative embodiments, fan blade assembly 13 is connected to brushless motor assembly 12 via connecting assembly 14, and fan blade assembly 13 rotates along with rotation of brushless motor assembly 12. The brushless motor assembly 12 includes a housing 121 at an outer surface thereof and a first mounting hole 122 at a central position thereof. The fan blade assembly 13 includes a fixing member 133, the fan blades 131 are spirally mounted on the fixing member 133, the fixing member 133 has a U-shaped longitudinal section, and the fixing member 133 is a hollow structure to form a mounting portion 132 capable of being mounted on the brushless motor assembly 12. The fitting portion 132 is further provided with a second mounting hole 134 to be fitted to the fixing portion 113 of the bracket 11. Specifically, the fan blade assembly 13 is sleeved on the cover 121 of the brushless motor assembly 12 through the sleeving part 132, the first mounting hole 122 in the brushless motor assembly 12 is installed on the fixing part 113, and one end of the fixing part 113 protrudes out of the first mounting hole 122 to be matched with the second mounting hole 134 of the fan blade assembly 13, so that the brushless motor assembly 12 and the fan blade assembly 13 are stably installed on the bracket 11 and are of an integral structure.

Referring to fig. 6 to 10, in some alternative embodiments, the outer diameter of the mounting groove 112 for mounting the battery 31 is not greater than the outer diameter of the fixing member 133. It can be understood that, when the fan blade assembly 13 rotates with the brushless motor assembly 12, the effective area of the air supply is the annular area formed by the fan blade protruding out of the fixing member 133, and in order to avoid the wind potential being blocked by the mounting groove 112, the outer diameter of the mounting groove 112 is not greater than the outer diameter of the fixing member 133, so as to ensure the air supply amount as large as possible. On the other hand, the clearance between the fan blades 131 on the fixing member 133 and the inner wall of the bracket 11 is not more than 1 mm, and the fan blades 131 are as close as possible to the inner wall of the bracket 11 without interfering with the inside of the bracket 11, so that the wind pressure can be increased and the air supply amount can be increased.

Referring to fig. 6, 7, 13 and 14, in some alternative embodiments, the circuit component 32 of the electrical appliance structure 30 abuts against the battery 31, the fixing frame 33 is sleeved on the circuit component 32 and is installed at an end of the battery 31, and the circuit component 32 and the battery 31 are integrated by the fixing frame 33. The fixing frame 33 is internally provided with an accommodating cavity 332 for accommodating the circuit assembly 32, the circuit assembly 32 comprises a circuit board 323 positioned in the accommodating cavity 332 of the fixing frame 33, and a first convex part 324 and a second convex part 325 which protrude out of the fixing frame 33, the first convex part 324 is connected with a button 321, and the second convex part 325 is connected with a charging interface 322. The main structure of the circuit board 323 is located in the fixing frame 33, and only the first protrusion 324 and the second protrusion 325 connected to the button 321 and the charging interface 322 are exposed out of the fixing frame 33. The button 321 and the charging interface 322 are partially exposed out of the housing 20, and the first protrusion 324 and the second protrusion 325 are engaged with the housing 20 to reinforce the installation of the circuit assembly 32 and the battery 31 in the housing 20. That is, the first protrusion 324 and the second protrusion 325 are connected with the casing 20 in the air duct 101 to play a role of auxiliary support, so that the whole structure is more stable. The button 321 and the charging interface 322 are partially exposed out of the housing 20 for operation. Illustratively, the line component 32 may be in a concave shape, or the line component 32 may be rectangular, or the line component 32 may be L-shaped, etc.

Referring to fig. 6, 7, 13 and 14, in some alternative embodiments, two sides of the fixing frame 33 are provided with slots 333 for positioning and installing the circuit assembly 32, the circuit assembly 32 is clamped in the slots 333, and the first protrusion 324 and the second protrusion 325 protrude out of the fixing frame 33 through the slots 333. It can be understood that the circuit component 32 is clamped in the fixing frame 33, and then the fixing frame 33 is sleeved on the cylindrical battery 31, so that the whole structure is reasonable and compact. On the other hand, the fixing frame 33 is provided with a first engaging portion 331 engaged with the housing 20, the housing 20 is provided with a second engaging portion 203 engaged with the first engaging portion 331, and the connection between the fan structure 10 and the housing 20 is reinforced by the engagement of the first engaging portion 331 and the second engaging portion 203. The first engaging portion 331 and the slot 333 are disposed on both sides of the fixing frame 33, and the first engaging portion 331 and the slot 333 on the same side are substantially the same at the longitudinal position of the fixing frame 33, so that the wind resistance in the wind tunnel 101 can be reduced. Since the first protrusion 324 and the second protrusion 325 in the wire assembly 32 protrude out of the fixing frame 33 through the slots 333 at two sides, if the first engaging portion 331 and the slots 333 are distributed at different positions, the obstacles in the inner circumference of the air duct 101 are increased, and thus the wind resistance in the air duct 101 is increased, so that the wind power is reduced. First engaging portion 331 and first protrusion 324 or second protrusion 325 are overlapped together in air duct 101 along the length direction of air duct 101, so that the placement of components in air duct 101 can be reduced to the greatest extent, and the blockage of air duct 101 is reduced. The first engaging portion 331 and the slot 333 are located at substantially the same position in the longitudinal direction of the fixing frame 33, and the air duct 101 is open at other positions, so that the wind force is not greatly influenced. The structural layout of each part in the air duct 101 is reasonable, the area of the air duct 101 is increased to the greatest extent, and the wind resistance is reduced.

Referring to fig. 11 and 12, in some alternative embodiments, the housing 20 includes a first housing 21 and a second housing 22, the first housing 21 and the second housing 22 may be respectively provided with second engaging portions 203 engaged with the first engaging portions 331, the number of the first engaging portions 331 is the same as that of the second engaging portions 203, and the shapes and sizes of the first engaging portions 331 and the second engaging portions 203 may be different. It can be understood that the first protrusion 324 and the second protrusion 325, protruding out of the fixing frame 33, on both sides of the circuit assembly 32 can assist in supporting the fan structure 10 and the electrical structure 30, and then the fixing frame 33 is engaged with the housing 20, so that the installation of the air duct 101 assembly in the housing 20 is more stable. Meanwhile, all main components of the circuit board 323 are integrated in the fixing frame 33, so that the circuit board 323 can be effectively protected, structural members in the air duct 101 can be reduced, and the circuit board 323 is prevented from being directly arranged in the air duct 101 to block air supply. The fan structure 10 of the present invention makes the area of the air duct 101 larger, and greatly reduces the wind resistance.

Referring to fig. 11 and 12, in some alternative embodiments, a mounting portion 201 is disposed in the housing 20 to be engaged with the bracket 11, and the mounting portion 201 is recessed into an inner wall of the housing 20. The bracket 11 is engaged with the mounting portion 201, and the mounting of the fan structure 10 in the housing 20 is reinforced by the mounting portion 201. The housing 20 includes a first housing 21 and a second housing 22, and the first housing 21 and the second housing 22 are mounted together through a locking protrusion 212 and a locking hole 221, and then are reinforced by a fixing ring 24. The mounting portion 201 is disposed in the first casing 21 and the second casing 22, and an inner diameter of the mounting portion 201 is substantially the same as an outer diameter of the bracket 11, so that the entire blower fan structure 10 is stably mounted in the casing 20.

Referring to fig. 1 to 4 and 11 and 12, in some alternative embodiments, an air intake assembly 23 is disposed at an end of the housing 20 close to the bracket 11, the air intake assembly 23 includes an air intake cover 231 detachably mounted on the housing 20, and a matching portion 202 matched with the air intake cover 231 is disposed at the end of the housing 20. Specifically, the air inlet cover 231 is provided with a plurality of first air inlets 232, and the plurality of first air inlets 232 are arranged on the side surface of the air inlet cover 231. The first air inlets 232 are in a grid shape, the ratio of the height of the first air inlets 232 to the length of the fan blades 131 in the fan blade assembly 13 is greater than or equal to 0.9, and the height of the first air inlets 232 is approximately the same as the length of the fan blades 131, so that the wind energy is transmitted as much as possible. If the clearance between the fan blades 131 and the housing 20 is too large, the amount of air backflow is increased, and the air circulates back and forth in the air cavity, which is easy to accelerate the temperature rise of the fan structure 10. The air inlet cover 231 is further provided with a second air inlet 233, the second air inlet 233 is formed in the bottom surface of the air inlet cover 231, and more air can be fed through the first air inlet 232 and the second air inlet 233, so that the air volume is larger. Wherein, the minimum distance between the tip that first air intake 232 is close to flabellum subassembly 13 and flabellum subassembly 13 is more than or equal to 5 millimeters, and the distance between first air intake 232 and the flabellum subassembly 13 is not less than 5 millimeters promptly to make the leakproofness of whole structure better, can not leak out, supply air through fan structure 10 with sufficient amount of wind, simultaneously can also the noise abatement.

Referring to fig. 1 and 11, in some alternative embodiments, the end of the housing 20 away from the support 11 is provided with an annular air outlet 102. It can be understood that the fan assembly 13 includes a fixing member 133 and a plurality of fan blades disposed on the fixing member 133, when the fan blades rotate, the fan blades and the fixing member 133 form an annular air supply area, and a ratio between an area of the air outlet 102 and the air supply area ranges from 1:3 to 1: 2. The air supply area of fan blade assembly 13 is greater than the air outlet area of air outlet 102 to can effectual compressed air, improve the wind pressure, increase fan air supply distance. On the other hand, be provided with a plurality of pressure boost stator 211 in the air outlet 102, a plurality of pressure boost stator 211 with the even and equidistance division of air outlet 102 a plurality of air-out portions, be provided with pressure boost stator 211, can reduce the windage and improve the wind pressure simultaneously, increase supply distance.

As shown in fig. 1 to 14, the blower structure 10 of the present invention is suitable for a hand-held fan. The fan structure 10 includes a support 11, and a brushless motor assembly 12 and a fan blade assembly 13 installed in the support 11, wherein an installation groove 112 for installing a battery 31 is provided at one end of the support 11 away from the fan blade assembly 13, and the battery 31 is a cylindrical battery 31. An electrical structure 30 integrated with the fan structure 10 is also disposed in the air duct 101. The electrical structure 30 comprises a cylindrical battery 31, a circuit assembly 32 and a fixing frame 33, wherein the circuit assembly 32 is fixed on the cylindrical battery 31 through the fixing frame 33. Namely, the fan blade assembly 13, the brushless motor assembly 12, the bracket 11, the battery 31, the circuit assembly 32 and the fixing frame 33 are integrally formed. The preset interval between the flow guide component 111 and the fan blade component 13 is between 1.5 mm and 2.5 mm, so that the noise of the fan blades can be effectively reduced, and the air volume can be increased. Fan structure 10 is a body structure, has effectually integrated each part of fan structure 10 for wind channel 101 area is bigger, and the windage is littleer. According to the concealed fan blade type handheld fan 100, the fan structure 10 and the shell 20 form the air duct 101, and as the fan structure 10 effectively integrates all parts, the area of the air duct 101 is larger, and the wind resistance is smaller. The circuit component 32 is fastened and fixed on the battery 31 through the fixing frame 33, the circuit board 323 in the circuit component 32 is located in the fixing frame 33, that is, most circuit components of the handheld fan are integrated on the circuit board 323, and the circuit board 323 is located in the fixing frame 33, so that the circuit components can be effectively protected, the circuit components can be reduced to be exposed in the air duct 101 to the greatest extent, and the wind power in the air duct 101 is maximized. And the part of the circuit assembly 32 protruding out of the shell 20 can play a role of auxiliary support, so that the whole structure is more stable. On the other hand, the ratio of the height of the first air inlet 232 to the length of the fan blades in the fan blade assembly 13 is greater than or equal to 0.9, so that a sufficiently large air inlet amount can be maintained. The minimum distance between the end of the first air inlet 232 close to the fan blade assembly 13 and the fan blade assembly 13 is greater than or equal to 5 mm, so that noise can be reduced. The ratio of the area of the air outlet 102 to the air supply area ranges from 1:3 to 1:2 to effectively compress air and increase air pressure. A plurality of pressure guide vanes 211 are arranged in the air outlet 102, so that the air pressure can be improved, and the air supply distance can be increased. The hand-held fan 100 with the hidden fan blades can effectively increase the area of the air channel 101, increase the air inlet volume, reduce noise and increase the whole air outlet volume, and has better user experience.

The above disclosure is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the utility model, so that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the utility model.

Claims (16)

1. A fan structure is suitable for a handheld fan and is characterized by comprising a support, a brushless motor assembly and a fan blade assembly, wherein the brushless motor assembly and the fan blade assembly are arranged in the support; the support is kept away from the one end of flabellum subassembly is provided with the mounting groove that is used for installing the battery, still be provided with the water conservancy diversion subassembly in the support, the water conservancy diversion subassembly with arrange according to predetermineeing the interval between the flabellum subassembly.

2. The fan structure of claim 1 wherein the predetermined spacing is between 1.5 mm and 2.5 mm.

3. The fan structure of claim 1, wherein the brushless motor assembly, the fan blade assembly, and the flow guide assembly are coaxially disposed.

4. The fan structure according to claim 1, wherein the fan blade assembly includes a fixing member sleeved on the brushless motor assembly, the fan blades of the fan blade assembly are disposed on the fixing member, and an outer diameter of the mounting groove is not greater than an outer diameter of the fixing member.

5. The fan structure of claim 1, wherein the fan blade assembly comprises a plurality of fan blades, and the flow guide assembly comprises a plurality of flow guide vanes, wherein the fan blades and the flow guide vanes have opposite helical directions.

6. The fan structure of claim 5, wherein a clearance between the fan blades and the inner wall of the support is less than or equal to 1 millimeter.

7. A hand held fan of hidden fan blade type comprising a housing, characterized by further comprising a fan structure according to any of claims 1-6, said fan structure being mounted within said housing, the outer surface of said fan structure and the inner surface of said housing forming an air duct for supplying air.

8. The hand-held fan with hidden blades as claimed in claim 7, further comprising a circuit component and a fixing frame, wherein the circuit component abuts against the battery, the fixing frame is sleeved on the circuit component and is installed at the end of the battery, and the circuit component and the battery are integrated by the fixing frame.

9. The concealed fan-blade handheld fan according to claim 8, wherein the circuit assembly comprises a circuit board located in the fixing frame, and a first protrusion and a second protrusion protruding out of the fixing frame, the first protrusion is connected with a button, the second protrusion is connected with a charging interface, the button and the charging interface are both partially exposed outside the housing, and the circuit assembly and the battery are mounted in the housing by means of cooperation of the first protrusion and the second protrusion with the housing.

10. The concealed fan-blade handheld fan according to claim 9, wherein two sides of the fixing frame are provided with groove bodies for positioning and installing the circuit assembly, the circuit assembly is clamped in the groove bodies, and the first protruding portion and the second protruding portion protrude out of the fixing frame through the groove bodies.

11. The hand-held fan with hidden fan blades as claimed in claim 9, wherein the two sides of the fixing frame are provided with first engaging portions engaged with the housing, the first engaging portions and the first protruding portions or the second protruding portions are overlapped together in the air duct along the length direction of the air duct, the housing is provided with second engaging portions engaged with the first engaging portions, and the engagement between the fan structure and the housing is strengthened by the engagement between the first engaging portions and the second engaging portions.

12. The hand-held fan with hidden fan blades as claimed in claim 7, wherein a mounting portion is provided in the housing, the mounting portion engaging with the bracket, the mounting portion being recessed into an inner wall of the housing, the bracket being mounted in the mounting portion, the mounting portion being used to reinforce the fan structure mounted in the housing.

13. The concealed fan blade type handheld fan according to claim 7, wherein an air inlet assembly is disposed at an end of the housing close to the support, the air inlet assembly includes an air inlet cover detachably mounted on the housing, the air inlet cover is provided with a plurality of first air inlets, the plurality of first air inlets are in a grid shape, and a ratio of a height of the first air inlets to a length of the fan blades in the fan blade assembly is greater than or equal to 0.9.

14. The concealed fan blade handheld fan of claim 13, wherein a minimum distance between an end of the first air inlet close to the fan blade assembly and the fan blade assembly is greater than or equal to 5 mm.

15. The hand-held fan with hidden fan blades as claimed in claim 7, wherein an annular air outlet is disposed at an end of the housing away from the bracket, the fan blade assembly comprises a fixing member and a plurality of fan blades disposed on the fixing member, an annular air supply area is formed between the fan blades and the fixing member when the fan blades rotate, and a ratio of the area of the air outlet to the air supply area ranges from 1:3 to 1: 2.

16. The concealed fan blade type handheld fan according to claim 15, wherein a plurality of pressure guide vanes are disposed in the air outlet, and divide the air outlet into a plurality of air outlet portions evenly and equidistantly.

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