Neck-hung fan

Abstract

The invention relates to the field of portable heat dissipation, in particular to a neck-hanging fan which comprises a fan, a ventilation channel, a first air inlet and a first air outlet, the first air inlet and the first air outlet are communicated with the ventilation channel, and the fan is arranged in the ventilation channel. The fan runs, air flow penetrating through the ventilation channel is formed between the first air inlet and the first air outlet, and the direction of the rotating center axis of the fan is consistent with the direction of the air flow; at least two silencing devices are arranged in the ventilation channel, at least one silencing device is arranged between the first air inlet and the draught fan, and at least the other silencing device is arranged between the draught fan and the first air outlet. The neck-hanging fan can achieve the effects of high wind speed and low noise, and can effectively reduce the influence of high-frequency noise on a user so as to improve the user experience.

Description

[Technical field]

[0001] The invention relates to the field of portable heat dissipation, and in particular to a neck-hanging fan. [Background technology]

[0002] As people's demand for the use scenarios and comfort of neck-hanging fans increases, since neck-hanging fans are usually hung on the user's neck, close to the ears and head, the noise generated by the fan during operation has a significant impact on the user's experience. Since this position is very close to the ear, noise may not only affect communication and attention, but may even cause hearing damage. Consumers are particularly sensitive to noise problems of such products. The hearing frequency range that the human ear can generally perceive is 20Hz-20kHz, among which the sound of 1000-3000hz is the most sensitive. If the sound frequency continues to remain at 10kHz-20kHz, it will make people feel uncomfortable. The presence of this high-frequency noise will significantly reduce the user's comfort.

[0003] Although the neck hanging fans disclosed in the prior art have been improved in design and function, they are still insufficient in terms of comfort and noise control for long-term wearing. Although a higher air outlet speed can provide a stronger cooling effect, the noise also increases, so long-term wearing brings discomfort to users. Therefore, it is necessary to propose an improved solution for the noise problem of the neck hanging fan. [Summary of the invention]

[0004] In order to solve the noise problem of existing neck hanging fans in the prior art, the present invention provides a novel neck hanging fan.

[0005] The present invention provides a neck-hanging fan as a solution to the technical problem, which includes a fan, a ventilation channel, and a first air inlet and a first air outlet connected to the ventilation channel, wherein the fan is arranged in the ventilation channel, and the fan runs and forms an airflow that passes through the ventilation channel between the first air inlet and the first air outlet, and the direction of the rotation center axis of the fan is consistent with the direction of the airflow; at least two silencers are provided in the ventilation channel, at least one of the silencers is provided between the first air inlet and the fan, and at least another silencer is provided between the fan and the first air outlet.

[0006] Preferably, the fan includes a fan casing, a fan channel is provided in the fan casing, and the fan also includes an impeller and a high-speed three-phase motor provided in the fan channel, the impeller is connected to the rotating shaft of the high-speed three-phase motor, the high-speed three-phase motor drives the impeller to rotate and forms an airflow in the fan channel.

[0007] Preferably, the fan casing includes an air inlet end and an air outlet end, and the silencer is arranged at the air inlet end and the air outlet end; or the silencer is arranged close to the air inlet end and the air outlet end.

[0008] Preferably, the distance between the silencer and the air inlet end is 0.1-0.7 times the inner diameter of the fan casing; and / or the distance between the silencer and the air outlet end is 0.1-0.7 times the inner diameter of the fan casing; and / or the ratio of the inner diameter L3 of the silencer to the outer diameter L2 of the impeller of the fan is (0.95-1.05):1.

[0009] Preferably, the ratio of the inner diameter of the fan casing to the maximum outer diameter L1 of the impeller is in the range of 1.01-1.15; and / or the outer diameter L2 of the impeller is in the range of 14 mm-30 mm.

[0010] Preferably, the impeller includes a hub and blades arranged on the edge of the hub, the hub is connected to the rotating shaft of the high-speed three-phase motor, the ratio of the outer diameter of the hub to the outer diameter of the impeller is 0.5-0.8, and the projections of adjacent blades along the wind flow direction at least partially overlap.

[0011] Preferably, the ventilation passage includes a first air duct and a second air duct, the fan is arranged in the second air duct, a second air outlet is provided at one end of the second air duct close to the first air duct, a first air inlet is provided at one end of the second air duct away from the second air outlet, the first air duct is provided with the first air outlet, one of the silencers is arranged on the inner wall of the second air duct close to the first air inlet, and another of the silencers is arranged on the inner wall of the second air duct close to the second air outlet.

[0012] Preferably, the silencer device comprises a support member and a silencer, wherein the support member is arranged between the inner wall of the ventilation passage and the silencer or the silencer passes through the support member.

[0013] Preferably, the support member is an annular structure, and a space for accommodating at least a portion of the silencer is formed between the support member and the inner wall of the ventilation channel.

[0014] Preferably, the support member includes any one or a combination of a plastic frame, a carbon fiber frame, a nano material frame; and / or the silencer includes any one or a combination of silencer cotton, sound-absorbing cotton, polyurethane foam.

[0015] Compared with the prior art, the neck hanging fan provided by the present invention has the following beneficial effects:

[0016] 1. The present invention provides a neck hanging fan, which includes a fan, a ventilation channel, and a first air inlet and a first air outlet connected to the ventilation channel, wherein the fan is arranged between the first air inlet and the first air outlet, the ventilation channel is provided with the first air outlet, and the fan runs and forms an airflow between the first air inlet and the first air outlet; wherein the direction of the central axis of rotation of the fan is consistent with the direction of the airflow; at least two silencers are arranged in the ventilation channel, at least one of the silencers is arranged between the first air inlet and the fan, and at least another silencer is arranged between the fan and the first air outlet. By providing at least two silencers, the noise generated by the fan section of the neck hanging fan can be reduced, and specifically, the noise generated by the operation of the fan in the ventilation channel can be controlled below 75db, and the noise level is preferably below 65db.

[0017] 2. In some embodiments, the hanging neck fan provided by the present invention adopts a high-speed three-phase motor, which can provide an efficient and low-noise hanging neck fan control solution; the high-speed three-phase motor is particularly suitable for hanging neck fan solutions with higher requirements on the fan speed, which can help reduce the high-frequency vibration caused by the high-speed operation of the fan, thereby reducing the high-frequency noise.

[0018] 3. In the present invention, the specific location of the silencer can be selected based on the actual noise requirements. When the silencer is set at the air inlet and the air outlet, the silencer can effectively perform noise silencing near the air inlet and the air outlet of the fan, thereby reducing the transmission of sound waves in the ventilation channel; and when the silencer is set close to the air inlet and the air outlet, there is a certain distance between the silencer and the fan, and the setting of this distance is conducive to avoiding the influence of the fan operation on the fixed installation of the silencer, and avoiding unnecessary influence between the two functional parts.

[0019] 4. The distance between the silencer and the air inlet and air outlet of the fan casing is related to the inner diameter of the fan casing. Specifically, the distance between the silencer and the air inlet is 0.1-0.7 times the inner diameter of the fan casing; and / or the distance between the silencer and the air outlet is 0.1-0.7 times the inner diameter of the fan casing; and / or the ratio between the inner diameter L3 of the silencer and the outer diameter L2 of the impeller of the fan is (0.95-1.05):1. Any one, two or all three of the above three ratios can be selected. The above ratios can ensure a better silencing effect while ensuring the smoothness of the gas flow to meet the use requirements of high-speed, low-noise hanging neck fans.

[0020] 5. During high-speed operation of the fan, the noise of the hanging neck fan mainly comes from the fan. Therefore, the fan is configured to include a hub connected to the central rotating shaft of the fan, fan blades arranged on the outer periphery of the hub, and a motor connected to the end of the central rotating shaft away from the hub. The central rotating shaft is consistent with the wind flow direction, and the outer diameter L1 of the impeller formed by the hub and the fan blades is further limited to 14mm-30mm, which can meet the design of a miniaturized fan while further reducing the generation of noise.

[0021] 6. In the present invention, the ratio of the outer diameter of the hub to the outer diameter of the impeller is 0.5-0.8, which can ensure the stability of the impeller when the motor drives it to rotate, so as to meet the requirements of miniaturization and high-speed stable operation. Furthermore, the projections of the adjacent blades along the wind direction at least partially overlap, which can ensure that when the gas passes through the rotating blades, the generation of gas turbulence is reduced, so as to reduce the impact on the air outlet efficiency.

[0022] 7. A silencer is provided on the inner wall of the second air duct close to the first air inlet and / or the inner wall of the second air duct close to the second air outlet. The silencer can be provided at a suitable position as required to reduce the noise generated by the fan section.

[0023] 8. The muffler device includes a support member and a muffler, wherein the support member is disposed between the inner wall and the muffler or the muffler is passed through the support member. The support member can provide a fixing for the muffler to improve the stability of the overall structure of the neck hanging fan and achieve a better muffler effect.

[0024] 9. The neck hanging fan further includes a cold compress device, which is arranged on one side of the ventilation channel and connected to the ventilation channel. The cold compress device can provide additional cooling effect for the user to meet the needs of different usage scenarios. The cold compress device further includes a cold compress shell and a cold compress part at least partially exposed from the cold compress shell, the cold compress part at least partially contacts the human body, and the cold compress shell can provide fixed support and protection for the cold compress part.

[0025] 10. The neck-hanging fan claimed for protection in the present invention has a protective member provided between the inner surface of the ventilation passage and the outer surface of the fan casing. The provision of the protective member can improve the stability of the fan when installed in the ventilation passage, and can avoid supporting contact between the fan casing and the inner surface of the ventilation passage, thereby effectively reducing the generation of noise.

Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a three-dimensional schematic diagram of a neck hanging fan provided by an embodiment of the present invention.

[0028] Figure 2 yes Figure 1 A partial exploded diagram of the neck-hanging fan shown in FIG.

[0029] Figure 3 1 is a schematic diagram of a corresponding silencer device in a neck hanging fan in some embodiments.

[0030] Figure 4 is a schematic cross-sectional view of a neck hanging fan in some implementations.

[0031] Figure 5 yes Figure 4 An enlarged schematic diagram of point A is shown in FIG.

[0032] Figure 6 It is a schematic diagram of the axial explosion state structure of the support member and the silencer member in the silencer device in some embodiments of the present invention.

[0033] Figure 7 It is a schematic diagram of the structural relationship between the rotation center axis of the fan of the neck hanging fan and the direction of the air flow in some implementation methods.

[0034] Fig. 8A It is a schematic diagram of the fan structure in the axial disassembled state.

[0035] Figure 8B It is a schematic diagram of the fan structure in cross-section.

[0036] Fig. 9 It is a three-dimensional schematic diagram of the fan casing of the fan from another angle.

[0037] Fig.10 yes Figure 3 The enlarged schematic diagram is shown at B in the figure.

[0038] Fig.11 yes Fig. 8A The schematic diagram of the structure of the impeller from an upward angle is shown in FIG.

[0039] Fig.12 yes Fig. 8A The schematic diagram of the structure of the impeller from a top view shown in FIG.

[0040] Fig.13 yes Fig. 8A The main view angle structural diagram of the impeller shown in FIG.

[0041] Fig.14 yes Fig.13 A schematic diagram of the structure of the impeller at another angle shown;

[0042] Fig.15 yes Fig.10 A schematic structural diagram of the support member and the first air inlet cover in the silencer device shown.

[0043] Fig.16 It is a schematic diagram of functional modules of a control circuit in a neck hanging fan provided by another embodiment of the present invention.

[0044] Fig.17 It is a schematic diagram of the three-dimensional structure of the neck hanging fan shown in some embodiments of the present invention.

[0045] Fig.18 It is a three-dimensional schematic diagram of a neck hanging fan provided by an embodiment of the present invention.

[0046] Fig.19 yes Fig.16 A partial exploded diagram of the hanging neck fan is shown.

[0047] Fig. 20 1 is a schematic diagram of the inlet and outlet air flow directions of a neck hanging fan in some embodiments.

[0048] Fig.21 Schematic diagram of the second embodiment of the air inlet and outlet air flow directions of the neck hanging fan in some embodiments.

[0049] Fig. 22 It is a schematic diagram of the structural relationship between the rotation center axis of the fan of the neck hanging fan and the direction of the air flow in some implementation methods.

[0050] Fig.23 yes Fig.21 Schematic diagram of the simulation of the internal wind flow direction of the hanging neck fan shown in.

[0051] Description of the accompanying drawings:

[0052] 100. Neck fan

[0053] 10. Fan; 11. Hub; 12. Fan blade; 121. Blade top; 122. Blade root; 13. High-speed three-phase motor; 131. Rotating shaft; 132. First bearing; 133. Motor housing; 134. Magnetic ring; 135. Coil; 136. Second bearing; 137. Circlip; 138. Circuit board; 139. Card slot; 130. Control circuit; 14. Fan housing; 141. Air inlet; 142. Air outlet; 149. Fan channel; 15. Protective component; 151. Matching component; 19. Impeller;

[0054] 20, ventilation channel; 21, first air duct; 211, hollow body; 2111, main air duct; 2112, auxiliary air duct; 210, air guide plate; 210A, blocking surface; 210B, guiding surface; 212, extension section; 2113, groove; 22, second air duct; 213, guide member; 222, fixing member; 201, first air outlet; 202, first air inlet; 2021, air inlet cover; 203, second air inlet; 204, second air outlet; 23, air duct pressurization section; 231, transition surface;

[0055] 30. Silencer; 31. Support member; 32. Silencer.

[0056] 40. cold compress device; 41. cold compress housing; 42. cold compress part;

[0057] F 1. The air outlet direction of the neck-mounted fan; F2. The air flow direction in the air duct;

[0058] a. the minimum angle between the air outlet direction F1 of the first air outlet of the ventilation channel 20 and the rotation center axis I of the fan 10;

[0059] b. the minimum angle between the central axis P of the first air duct 21 along the airflow direction F2 and the extension line of the rotation central axis of the fan 10;

[0060] c. the minimum angle between the guide plate 210 and the wind flow direction F2 in the first air duct;

[0061] I. The central axis of rotation of the fan 10;

[0062] L2, outer diameter of impeller 10;

[0063] L3, inner diameter of fan housing 14;

[0064] θ, the outlet wing angle of the blade top 121;

[0065] b1, the distance between the tops 121 of two adjacent blades 12; b2, the distance between the roots 122 of two adjacent blades 12;

[0066] S1, the maximum diameter of the first air duct 21 perpendicular to the wind flow direction; S2, the maximum diameter of the second air duct 22 perpendicular to the wind flow direction;

[0067] P, the central axis of the first air duct along the airflow direction;

[0068] 50. Control module;

[0069] 60. Driver module. [Specific implementation method]

[0070] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0071] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0072] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0073] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0074] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] Please refer to Figure 1 and Figure 2 The present invention provides a neck hanging fan 100, which includes a fan 10, a ventilation channel 20, and a first air outlet 201 and a first air inlet 202 connected to the ventilation channel 20, wherein the fan 10 is arranged in the ventilation channel 20, and the fan 10 runs and forms an airflow penetrating the ventilation channel 20 between the first air inlet 202 and the first air outlet 201, and the direction of the rotation center axis of the fan 10 is consistent with the direction of the airflow; at least two silencers 30 are arranged in the ventilation channel 20, at least one of the silencers 30 is arranged between the first air inlet 202 and the fan 10, and at least another silencer 30 is arranged between the fan 10 and the first air outlet 201.

[0076] Specifically, Figure 1 As shown in FIG. 1 , the neck hanging fan 100 includes two ventilation channels 20. A first air inlet 202 and a fan corresponding to the first air inlet are provided in the ventilation channel 20. Figure 1 As shown in the figure, four silencers 30 are arranged in the neck hanging fan 100. Two silencers 30 are arranged in correspondence with each fan 10, that is, two silencers 30 are arranged in each ventilation channel 20. One of the silencers 20 is arranged between the first air inlet 202 and the fan 10, and the other silencer 20 is arranged between the fan 10 and the first air outlet 201.

[0077] In some other embodiments, three silencers 30 may be provided in a single ventilation passage 20, wherein two silencers 30 are provided between the first air inlet 202 and the fan 10. Another silencer 30 may be provided between the fan 10 and the first air outlet 201. The silencer 30 may also be provided in plurality, and the corresponding setting positions and quantities may be adjusted as required.

[0078] like Figure 4 As shown in , the ventilation channel 20 further includes a first air duct 21 and a second air duct 22, the fan 10 is arranged in the second air duct 22, the second air duct 22 is provided with a second air outlet 204 at one end close to the first air duct 21, the first air inlet 202 is provided at one end of the second air duct 22 away from the second air outlet 204, and the first air duct 21 is provided with the first air outlet 201. Figure 2As shown in the figure, two silencers are arranged in the ventilation passage 20, one of which can be arranged on the inner wall of the second air duct 22 near the first air inlet 202, and the other silencer 30 can be arranged on the inner wall of the second air duct 22 near the second air outlet 204. Such an arrangement can ensure that silencers 30 are arranged at both the air inlet and air outlet ends of the fan 10, thereby further reducing the noise generated by the high-speed operation of the fan 10.

[0079] It can be understood that the specific number of the silencer 30, the distance between the silencer 30 and the fan 10, or the specific shape and structure of the silencer 30 can be adjusted based on the noise level and needs.

[0080] In order to further improve the silencing effect of the silencing device and ensure the stability of the installation, Figure 5 and Figure 6 As shown in , the muffler device 30 further includes a support member 31 and a muffler 32, and the support member 31 can provide fixed support for the muffler 32. Specifically, the muffler 32 is disposed between the inner wall of the second air duct 22 and the support member 31.

[0081] Continue as Figure 5 and Figure 6 As shown in , the support member 31 is an annular structure, and a space for accommodating at least a portion of the muffler 31 is formed between the support member 31 and the inner wall of the ventilation channel 20 .

[0082] Furthermore, the support member 31 is an annular structure, the silencer 32 is a hollow annular structure, and a space for accommodating the silencer 32 is formed between the support member 31 and the inner wall of the second air duct 22. Furthermore, in order to achieve a better fixing structure, a fixing structure connected to the inner wall of the second air duct 22 is provided on the support member 31, and the fixing method can be clamping, screwing, gluing, etc.

[0083] In some other embodiments, the support member 31 is disposed on the inner wall of the second air duct 22, and the muffler 32 is penetrated through the support member 31, that is, the support member 31 is formed first, and then the muffler 32 is formed on the support member 31 or inserted therein, and the support member 31 is equivalent to providing a skeleton structure for the muffler 32. In this embodiment, the support member 31 is specifically an annular structure, and the muffler 32 is a hollow ring.

[0084] Furthermore, in order to achieve a better silencing effect and avoid the silencing device 30 affecting the air intake and air outlet of the fan 10, the inner diameter L3 of the hollow annular silencing device 30 formed by connecting the support member 31 and the silencing member 32 is equivalent to the outer diameter L2 of the impeller of the fan 10.

[0085] Specifically, the difference between the inner diameter L3 of the silencer 30 and the outer diameter L2 of the impeller of the fan 10 is 0.95-1.05, so that the air entering from the first air inlet 202 can smoothly pass through the silencer 30 and enter the air duct of the fan 10 .

[0086] like Figure 6 As shown in , in order to make the silencer 30 more firmly fixed in the second air duct 22. The support member 31 includes any one or a combination of several of a plastic frame, a carbon fiber frame, a nano material frame, etc. The silencer 32 includes but is not limited to silencer cotton, foam cotton, etc., specifically including at least one or a combination of several of the following, sound-absorbing cotton: such as polyester fiber cotton, glass fiber cotton, which can effectively absorb sound and reduce echo; foam material: such as polyurethane foam, which has good sound absorption effect and is often used inside the fan casing; rubber pads or shock-isolating pads: used to reduce the transmission of mechanical vibration and noise. Spraying material: It can also be an acoustic coating, which can be directly applied to the inner wall of the second air duct 22 or the surface of the fan 10 to increase the sound absorption performance, thereby achieving a shock-absorbing effect.

[0087] It can be understood that the main noise of the neck hanging fan 100 that can provide high-speed wind in the present invention comes from the fan 10 that runs at high speed to generate high-speed wind flow. Figure 7 , Fig. 8A And combined Fig. 9 As shown in the figure, the fan 10 includes a fan casing 14, a fan channel 149 is provided in the fan casing 14, and the fan 10 also includes an impeller 19 and a high-speed three-phase motor 13 provided in the fan channel 149, the impeller 19 is connected to the rotating shaft of the high-speed three-phase motor 13, the high-speed three-phase motor 13 drives the impeller 19 to rotate and forms an airflow F2 in the fan channel 141.

[0088] Among them, the rotation speed of the high-speed three-phase motor is relatively high, the initial velocity of the air flow blown out by the fan 10 is higher, and the blowing effect is better.

[0089] In the above embodiment, if Figure 7 and Fig. 8AAs shown in , the air inlet and the air outlet are respectively opened at opposite ends of the fan housing 14. The fan housing 14 can wrap the fan blades 12 and the motor 13 in the fan 10 therein, and the fan housing 14 can constrain the airflow generated by the fan blades 12, so that the airflow blown out by the fan 10 has the minimum possibility of lateral movement, and the kinetic energy of the airflow blown out by the fan 10 is more concentrated, which can further reduce the aerodynamic noise of the hanging neck fan 100 and improve the air outlet efficiency of the hanging neck fan 100. The fan blades 12 are in the fan housing 14, which can also enhance the safety of the fan blades 12, and avoid the problem that the fan blades 12 are easily damaged after being exposed to the outside and contacting other components arranged in the second air duct 22. The setting of the fan housing 14 further improves the integrity of the fan 10, facilitates production and installation, and at the same time, enhances the stability of the fan 10 to meet the requirements of high-speed operation, and can also reduce the overall noise of the fan 10.

[0090] Continue as Fig. 8A As shown in the figure, the ratio of the inner diameter of the fan housing 14 to the maximum outer diameter L1 of the impeller 19 is in the range of 1.01-1.15. Specifically, the ratio of the inner diameter of the fan housing 14 to the maximum outer diameter L1 of the impeller 19 can be 1.01, 1.05, 1.08, 1.1, 1.15, etc., or any numerical range within the above numerical range.

[0091] The maximum outer diameter L1 of the impeller 19 is 14 mm-30 mm. It can be understood that in some specific embodiments, the maximum outer diameter L1 of the impeller 19 is 14 mm, 18 mm, 20 mm, 22 mm, 25 mm, 27 mm, 30 mm, etc.

[0092] like Fig. 8A As shown in , in some specific embodiments of the present invention, the fan casing 14 includes an air inlet end 141 and an air outlet end 142, and the two silencers 30 are arranged at the air inlet end 141 and the air outlet end 142. It can be understood that in this structure, the silencer 30 is in contact with the fan casing 14 of the fan 10.

[0093] like Figure 7 and Fig. 9 As shown in , in some variant embodiments, the two silencers 30 are arranged close to the air inlet end 141 and the air outlet end 142 , wherein “close to” can be understood as a certain distance between the silencer 30 and the fan 10 .

[0094] In some other embodiments of the present invention, Fig.10 As shown in , the distance d1 between the silencer 30 and the air inlet end 141 is 0.1-0.7 times the inner diameter L3 of the fan housing 14;

[0095] In some other embodiments of the present invention, a distance d2 between the silencer 30 and the air outlet end 142 is 0.1-0.7 times the inner diameter of the fan casing 14 .

[0096] The above-mentioned distance d1 and distance d2 may be determined based on the type, size and noise requirement of the selected fan. The distance d1 and distance d2 may be set to be the same or different.

[0097] Specifically, the distance d1 is any value among 0.1 times, 0.15 times, 0.2 times, 0.3 times, 0.4 times, 0.45 times, 0.5 times, 0.6 times, 0.65 times, 0.7 times, etc. of the inner diameter of the fan casing 14. It can be understood that in addition to the specific multiples listed, it can also be any value within the range of 0.1-0.7 times.

[0098] Furthermore, the distance d2 can be any value such as 0.1 times, 0.15 times, 0.2 times, 0.3 times, 0.4 times, 0.45 times, 0.5 times, 0.6 times, 0.65 times, 0.7 times, etc. of the inner diameter of the fan casing 14. It can be understood that in addition to the specific multiples listed, it can also be any value within the range of 0.1-0.7 times.

[0099] In some specific implementations of the present invention, since the rotation speed of the fan 10 can reach more than 30,000 revolutions per minute, and the wind speed of the wind blown out through the ventilation channel 20 reaches more than 4.8 meters per second, noise is the main problem that needs to be solved by the neck hanging fan 100 in the present invention. The noise is mainly concentrated in the second air duct 22 that accommodates the motor 13. In order to reduce the discomfort caused by the noise to the user, it is necessary to control the noise related to the second air duct 22 to below 75db, and the noise level can also be below 65db. The noise sound pressure in the second air duct 22 is on the fan blades 12, the motor 13 and other structures, and the silencer 30 is arranged in the second air duct 22, which can effectively reduce the noise, and can also effectively reduce the noise generated by the high-frequency vibration of the fan 10.

[0100] Furthermore, in order to reduce the noise in a specific high frequency band generated by the operation of the fan 10 , it is necessary to further adjust the internal structure of the fan 10 .

[0101] Continue to combine Fig. 8A and Figure 8B As shown in the figure, one end of the fan housing 14 is abutted against or spaced apart with a first bearing 132, the motor 13 is sleeved on the fan housing 14 and the first bearing 132, one end of the rotating shaft of the motor 13 passes through the first bearing 132 and is connected to the fan housing 14; the fan blade 12 is connected to the other end of the rotating shaft 131.

[0102] Since the first bearing 132 is made of metal, it has a higher physical strength and can provide stronger support for the motor 13. At the same time, the first bearing 132 has a higher support strength, so it can avoid the problem of the fan housing 14 being damaged and broken due to excessive force when the motor 13 rotates at high speed, thereby improving the service life of the fan module. At the same time, the setting of the first bearing 132 shortens the length of the fan housing 14, and the shortened length shortens the torque of the fan housing 14 when it is stressed, so that it can withstand more force from the motor 13, making the rotation of the motor 13 more stable and the air outlet efficiency higher.

[0103] In some embodiments, the motor 13 further includes: a coil 135 and a magnetic ring 134. The magnetic ring 134 is sleeved on the fan housing 14 and the first bearing 132. The motor 13 is sleeved on the magnetic ring 134, and the magnetic ring 134 is sleeved on the coil 135. In this embodiment, a accommodating cavity is opened on the fan blade 12, and the inner surface of the accommodating cavity is sleeved on the coil 135. When the motor 13 rotates, the coil 135 drives the magnetic ring 134 to rotate, and the magnetic ring 134 then drives the fan blade 12 to rotate. In this process, the rotating shaft 131 no longer provides driving force for the fan blade 12 like a traditional motor, but plays a role in stabilizing and fixing the fan blade 12. This rotation method can make the fan blade 12 rotate at a high speed and stably because the steering force area of ​​the magnetic ring 134 acting on the fan blade 12 is larger and the inertia moment of the fan blade 12 is smaller, such as Figure 3 As shown, in some embodiments, the motor 13 includes: a coil 135, a magnetic ring 134 and a motor housing 133, the coil 135 is sleeved on the fan housing 14 and the first bearing 132, the magnetic ring 134 is sleeved on the coil 135, the motor housing 133 is sleeved on the magnetic ring 134, and the motor housing 133 is fixedly connected to the rotating shaft 131, so that the motor housing 133 drives the rotating shaft 131 to rotate. In this embodiment, the coil 135 drives the magnetic ring 134 to rotate, and the magnetic ring 134 drives the motor housing 133 to rotate synchronously when rotating, and then the motor housing 133 drives the rotating shaft 131 connected thereto to rotate. This connection mode and driving mode, because the steering force area of ​​the magnetic ring 134 is larger, the magnetic coupling connection mode between the magnetic ring 134 and the coil 135 can make the magnetic ring 134 rotate faster and more stably, so that the motor 13 rotates faster and more stably. At the same time, due to the connection between the motor housing 133 and the rotating shaft 131, the rotational torque between the rotating shaft 131 and the fan blades 12 is smaller, and the rotational inertia resistance of the fan blades 12 is also smaller. When rotating at high speed, the fan blades 12 are less likely to shake and resonate, making the rotation of the fan blades 12 more stable and the speed higher. At the same time, since the assembly is more stable, the noise generated by high-frequency vibration can also be effectively reduced, thereby improving the user's comfort.

[0104] The coil 135 is respectively interference fit with the fan housing 14, the magnetic ring 134 is magnetically coupled with the coil 135, and the motor housing 133 is interference fit with the rotating shaft 131. During the rotation of the magnetic ring 134 and the coil 135, the magnetic ring 134 is in a suspended state for rotation, and is subjected to less physical friction than a traditional motor, so the rotation speed of the motor 13 can be further increased.

[0105] In some embodiments, the connection method between the coil 135 and the fan housing 14 is not limited to interference fit. Depending on the specific application scenario, the connection method between the coil 135 and the fan housing 14 can also be (but not limited to): gluing, welding, riveting, screw connection and other fixing methods.

[0106] In some embodiments, the connection method between the motor housing 133 and the rotating shaft 131 is not limited to interference fit. Depending on the specific application scenario, the connection method between the motor housing 133 and the rotating shaft 131 can also be (but not limited to): gluing, welding, riveting, screw connection and other fixing methods.

[0107] Furthermore, if Fig. 8A and Figure 8B As shown in , the rotating shaft 131 is also provided with a clamping groove 139 that cooperates with the clamping spring 137. The arrangement of the clamping spring 137 and the clamping groove 139 can improve the stability of the installation of the rotating shaft 131.

[0108] Combination Fig. 8A and Fig. 9 The impeller 19 further includes a hub 11 and blades 12 arranged on the edge of the hub 11, the hub 11 is connected to the rotating shaft of the high-speed three-phase motor 13, the ratio of the outer diameter of the hub 11 to the outer diameter of the impeller 19 is 0.5-0.8, and the projections of the adjacent blades 12 along the wind flow direction at least partially overlap. Such a configuration can further reduce the noise generated by the fan 10 during operation, thereby obtaining a better fan operation effect and a better user experience.

[0109] Specifically, the outer diameter L2 of the impeller 19 may further be 18 mm-22 mm, and the outer diameter L2 of the impeller 19 may also be 20 mm.

[0110] The use of the impeller 19 within the above outer diameter range can meet the use requirements of the miniaturized fan 10 and can maintain the high-speed and stable operation of the fan 10.

[0111] like Fig. 8A As shown in , the outer surface of the fan housing further includes a protective member 15, and the protective member 15 is specifically arranged between the inner surface of the ventilation channel and the outer surface of the fan housing.

[0112] Combination Fig.11As shown in , the ratio of the outer diameter L1 of the hub 11 to the outer diameter L2 of the impeller 19 is 0.5-0.8, specifically, the ratio of the outer diameter L1 of the hub 11 to the outer diameter L2 of the impeller 19 is 0.55-0.7. In some specific embodiments, the outer diameter L1 of the hub 11 is 12-15 mm.

[0113] like Fig.11 and Fig.12 As shown in FIG. 1 , the projections of the adjacent fan blades 12 along the wind flow direction at least partially overlap.

[0114] Furthermore, combined with Fig.12 , Fig.13 and Fig.14 It can be seen that the fan blade 12 includes a blade top 121 facing the wind inlet direction and a blade root 122 away from the wind inlet direction. The outlet wing angle θ of the blade top 121 is 30°-50°. The outlet wing angle θ of the blade top 121 is further limited to 43°-46°, which is conducive to making the air intake and air discharge of the fan 10 smoother, concentrating the generated wind force, and improving the wind generation efficiency of the fan 10. Fig. 20 As shown in , at the same time, according to the limitation of the outlet wing angle θ, the fan blade 12 can be tilted at a certain angle relative to the air inlet direction, thereby reducing the noise generated by the fan 10 during high-speed rotation.

[0115] Specifically, see Fig.14 As shown in the figure, the spacing b1 of the blade top 121 between two adjacent fan blades 12 is 2.5mm-5mm, and the spacing b2 of the blade root 122 between two adjacent fan blades 12 is 3mm-6mm. Specifically, the spacing between the two blade tops 121 can also be 3.5mm-4.5mm, and the spacing between the two blade root 122 is 4mm-5mm; further, the spacing between the two blade tops 121 can also be 4mm, 3.8mm, etc., and the spacing between the two blade root 122 is 4.3mm, 4.5mm, 4.8mm, etc.

[0116] The setting of the fan blades 12 and the limitation of the outer diameters of the hub 11 and the impeller 19 can make the flow of wind generated by the fan 10 along its rotation axis more uniform. The use of a fluid linear setting can make the flow direction of wind generated by the fan 10 more uniform and can further reduce the noise generated by the fan 10 during operation.

[0117] It can be understood that the outer diameter size and shape of the hub 11 can further have a greater impact on the wind speed, wind volume, etc. generated by the fan 10. Specifically, the hub 11 is formed by the superposition of a cylindrical section and a conical section, wherein the fan blades 12 are partially arranged in the cylindrical section and partially arranged in the conical section. Under the premise of further maintaining high wind speed and high wind volume, the stability of the fan blades 12 in the operating state can be improved to achieve a better operating effect.

[0118] Continue reading Fig.15 As shown in the figure, an air inlet cover 2021 can also be set at the first air inlet 202, and the air inlet cover 2021 is provided with a screen, and the external air can smoothly pass through the air inlet cover 2021 into the second air duct 22, and the air inlet cover 2021 can prevent foreign matter from entering the second air duct 22 through the first air inlet 202, thereby preventing foreign matter from affecting the operation of the fan 10 in the second air duct 22.

[0119] Please refer to Fig.16 In some specific implementations of the present invention, the neck hanging fan 100 also includes a control module 50 and a drive module 60, wherein the control module 50 can control the rated operating speed of the high-speed three-phase motor 13 through the drive module 60 according to the operating voltage, operating current and / or rated operating power, so as to reduce the high-speed noise of the high-speed three-phase motor 13 and control the wind speed within a preset wind speed range.

[0120] This technical solution realizes low-voltage driving of high-speed three-phase motors through the coordinated work of the control module 50 and the drive module 60 to meet the specific needs of portable fans. Among them, it is necessary to adjust the number of slots and pole pairs to adapt to low-voltage operation, select high-performance core materials to reduce magnetic losses and improve working efficiency under low voltage, set up an efficient inverter to convert low-voltage direct current into three-phase alternating current, ensure the stability of the power supply, and avoid voltage fluctuations affecting motor performance.

[0121] Among them, the operating voltage ranges from 3 to 6 volts, the operating current ranges from 0.25 to 2 amps, and the rated operating power ranges from 1 to 10 watts. The design of the high-speed three-phase motor 13 can provide a more efficient speed and power output at low voltage compared to existing portable fan motors, which is suitable for the needs of portable devices. The control module 50 accurately controls the high-speed three-phase motor 13 according to the real-time monitored operating voltage, operating current and rated operating power. By adjusting the power supply parameters of the high-speed three-phase motor 13, the control module 50 can effectively reduce the noise generated when the motor runs at high speed. The control module 50 can also adjust the wind speed of the fan so that it is within a preset wind speed range, which ensures the comfort of use and the stability of the equipment compared to the single-phase low-speed motor. The drive module 60 connects the control module 50 and the high-speed three-phase motor 13, and converts the instructions of the control module 50 into actual motor drive signals. The drive module 60 adopts efficient inverter technology to convert low-voltage direct current into alternating current suitable for the high-speed three-phase motor 13, ensuring efficient operation of the motor. Under different working conditions, the drive module 60 adjusts the speed and output power of the motor according to the instructions of the control module 50.

[0122] The technical effect of this embodiment is that: this technical solution provides a high-efficiency, low-noise, adjustable wind speed portable fan solution by combining a control module, a drive module and a high-speed three-phase motor. Through low-voltage drive technology and precise control strategy, it not only improves the portability and comfort of the fan, but also effectively improves the overall performance and energy efficiency of the device. This design is suitable for portable fan application scenarios that require high performance and low noise, filling the gap in the application of high-speed three-phase motors in small portable devices on the market.

[0123] As an embodiment, the operating voltage of the high-speed three-phase motor 13 is 3 to 6 volts, the operating current of the high-speed three-phase motor 13 is 0.12 to 2 amps, and / or the rated operating power of the high-speed three-phase motor 13 is 1 to 9 watts. The control module 50 controls the rated operating speed of the high-speed three-phase motor 13 to 6000-45000 RPM / MIN through the drive module 60 according to the operating voltage, operating current and / or rated operating power.

[0124] Among them, the high-speed three-phase motor 13 is driven by a voltage range of 3 volts to 4.5 volts, which is suitable for two batteries connected in series to supply power. The operating current range is 0.25 amps to 1.8 amps, ensuring stable operation at different speeds, and the power range is 0.8W-9W, which meets the power requirements of the portable fan. The control module 50 monitors the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 50 can accurately control the speed of the motor, and the adjustment range is 15000-41000 revolutions per minute, and its speed can also be more than 41000 revolutions per minute. The drive module 60 converts 3 volts to 4.5 volts of direct current into three-phase alternating current, and drives the high-speed three-phase motor 13 through inverter technology. The battery uses 2 batteries in series to provide a stable voltage. The number of pole pairs of the fan is 4 pairs, the number of slots is 9 slots, the number of blades is 5, and the number of guide vanes / fan blades is 9.

[0125] Specifically, the high-speed three-phase motor 13 can be driven by 3 volts, 3.2 volts, 3.5 volts, 3.7 volts, ..., 4.3 volts or 4.5 volts, suitable for two batteries connected in series, and the operating current range is 0.25 amps, 0.4 amps, 0.5 amps, 0.6 amps, 0.8 amps, 1.0 amps, 1.2 amps, 1.4 amps, 1.6 amps or 1.8 amps, ensuring stable operation at different speeds, and the power range is 1W-8W, which meets the power requirements of the portable fan. The control module 50 measures the working voltage, current and power of the motor in real time, and adjusts according to these parameters. The control module 50 can accurately control the speed of the motor, and the adjustment range is 15000-41000RPM. The drive module 60 converts 3 volts, 3.2 volts, 3.5 volts, 3.7 volts, ..., 4.3 volts or 4.5 volts of direct current into three-phase alternating current, and drives the high-speed three-phase motor 13 through inverter technology. The battery uses a single or double battery in series to provide a stable voltage. The fan has 4 pole pairs, 9 slots, 9 blades, and 9 guide vanes / impellers.

[0126] The high-speed three-phase motor 13 is controlled by FOC (Field-Oriented Control), also known as vector control, which is a variable frequency drive control method for controlling a three-phase brushless DC motor by controlling the amplitude and frequency of the inverter output voltage.

[0127] FOC control decomposes the sinusoidal stator current into a magnetic field component current parallel to the magnetic field and a torque component current perpendicular to the magnetic field, which are the direct-axis current and the quadrature-axis current respectively, and controls the two currents to achieve precise control of the motor speed and direction.

[0128] By adopting FOC control, the high-frequency vibration generated by the high-speed three-phase motor 13 during operation can be reduced. Therefore, by accurately controlling the control module 50, the drive module 60 and the high-speed three-phase motor 13, the vibration frequency of the fan 10 can be effectively adjusted to avoid the human ear from capturing high-frequency sounds, thereby further improving the comfort of using the neck hanging fan.

[0129] Please combine Fig.17 and Fig.18 In some other specific embodiments of the present invention, in the neck hanging fan 100, the fan 10 is arranged in the ventilation channel 20, and the fan 10 generates wind in the same direction as the rotation axis of the fan 10 when it is running, and the generated wind in the axial flow direction is blown out through the ventilation channel 20. The fan 10 can generate high-speed wind when it is running at a high speed. Specifically, the speed of the fan 10 can reach more than 30,000 revolutions per minute. The number of fans 10 set in a single ventilation channel 20 can be one, two or more than three, which can be adjusted based on the requirements for wind speed.

[0130] In some embodiments, the ratio of the wind speed of the airflow generated by the fan to the wind speed of the first air outlet can be limited to (2-4):1.

[0131] It can be understood that the rotation speed of the fan 10, the outlet wind speed of the fan 10 and the outlet wind speed of the first air outlet in the above technical solution are related technical solutions. Based on the rotation speed of the fan 10, the outlet wind speed of the fan 10 and the outlet wind speed of the first air outlet 201 in this technical solution, and the related structural relationship between the fan 10 and the ventilation channel 20, the demand for high-speed air outlet can be met. Specifically, the wind speed of the airflow blown out by the fan 10 is greater than 12 meters per second, and the wind speed of the airflow blown out through the ventilation channel 20 reaches more than 4.8 meters per second. Such a wind speed can solve the influence of natural wind or the surrounding environment on the operation effect of the neck hanging fan 100.

[0132] More preferably, the rotation speed of the fan 10 can reach more than 40,000 revolutions per minute, the wind speed of the airflow blown out by the fan 10 reaches more than 15 meters per second and less than 20 meters per second, and the wind speed of the airflow blown out through the ventilation channel 20 reaches more than 5.6 meters per second.

[0133] Combination Fig.18 As shown in, in this embodiment, the neck-hanging fan 100 is overall "U"-shaped, and the two fans 10 are arranged at the free end of the neck-hanging fan 100. The neck-hanging fan 100 includes two ventilation channels 20. The two ventilation channels 20 can be connected or can be set as a non-connected structure based on needs, so that the two ventilation channels 20 can work and discharge air independently.

[0134] Fig.18 The neck hanging fan 100 shown in the figure is a neck hanging fan, which can be used for the neck of a human body, so that the wind blown out from the ventilation channel 20 blows toward the face and head of the user, thereby accelerating the air flow above the neck and helping the user to dissipate heat. It can be understood that the neck hanging fan can also be a handheld fan, a clip fan, a versatile fan, etc.

[0135] like Fig.17 and Fig.18 As shown in , the neck hanging fan 100 also includes a cold compress device 40 connected to two independent ventilation channels 20, and the two ends of the cold compress device 40 are respectively connected to the two ventilation channels 20, and the connection method can be hinged, clamped, elastically connected, or cam connected. The cold compress device 40 further includes a cold compress shell 41 and a cold compress portion 42 at least partially exposed to the cold compress shell 41, and a refrigeration element (not shown) is provided in the cold compress portion 42, which can be a Peltier semiconductor refrigeration element and can provide a cooling effect for the human neck. It can be understood that the cold compress portion 42 can also use liquid cooling, air cooling or semiconductor refrigeration, or other solid refrigeration.

[0136] Furthermore, in this implementation, in order to meet the air outlet requirements in different application scenarios, such as Fig.18 As shown in FIG. 1 , at least two first air outlets 201 are provided on the ventilation channel 20 . The first air outlets 201 can be separately provided in the length direction of the ventilation channel 20 away from the end of the fan 10 .

[0137] In some specific embodiments, since the fan 10 generates a high-speed airflow, the fan 10 generates a relatively high wind speed in an instant when in operation, and the airflow will present a jet-like instantaneous wind. At least a portion of the airflow will quickly reach the end of the ventilation channel 20 away from the fan 10, and a portion of the airflow will be blown out from the first air outlet 201 from near to far. Fig.17 and Fig.18 As shown in, in some embodiments, the air outlet direction of the first air outlet 201 on the ventilation channel 20 is consistent with the rotation center axis I of the fan 10, so that the high-speed airflow will quickly pass through the ventilation channel 20 and be blown out directly from the first air outlet 201. At this time, the neck-hanging fan 100 can only generate high-speed wind with a single wind direction and concentrated air outlet. Long-term use will make the human body feel uncomfortable. It can be seen that the neck-hanging fan with concentrated high-speed wind in a single wind direction meets the increasingly rich use needs of the neck-hanging fan 100.

[0138] In order to improve the use comfort of the neck hanging fan 100, it is necessary to meet the use requirements of the neck hanging fan 100 for high speed and uniform air output. Fig.19 and Fig. 20As shown in , the air outlet direction F1 refers to the air outlet direction of the neck hanging fan 100, and the minimum angle between the extension line of the rotation center axis I of the fan 10 and the extension line of the air outlet direction F1 is the above-mentioned angle a.

[0139] The minimum angle a between the air outlet direction F1 of the first air outlet 201 of the ventilation channel 20 and the rotation center axis I of the fan 10 is further set to 50°-90°.

[0140] It can be understood that in this technical scheme, on the basis of limiting the rotation speed of the fan 10, the air outlet speed of the fan 10 and the air outlet speed of the first air outlet 201, the minimum angle a between the air outlet direction F1 of the first air outlet 201 of the ventilation channel 20 and the rotation center axis I of the fan 10 is further limited to 50°-90°, which defines a technical scheme associated with a technical feature. Therefore, in this technical scheme, the neck hanging fan 100 can provide high-speed and uniform wind to solve the problem in the prior art, especially when used outdoors, that the wind speed cannot reach the expected level or the air outlet is too concentrated, resulting in a poor user experience.

[0141] Specifically, the minimum angle a between the air outlet direction F1 of the first air outlet 201 of the ventilation channel 20 and the rotation center axis I of the fan 10 can also be 60°-70°. Fig.21 As shown in , the minimum angle a between the air outlet direction F1 of the first air outlet 201 and the rotation center axis I of the fan 10 is 65-70° or 66°-67°.

[0142] like Fig.19 , Fig. 20 and Fig.21 As shown in , within the range of the angle a, part of the wind blown out by the fan 10 will be delivered to the end of the ventilation channel 20 away from the fan 10, and then gradually flow back to the first air outlet 201 distributed on the ventilation channel 20 and blown out from the first air outlet 201, and the other part will be blown out directly from the first air outlet 201. Based on different air duct lengths, the positions of the first air outlet 201, and the wind speed, the above-mentioned specific air outlet methods will also be different. Through the arrangement of the above-mentioned structure, the air outlet speed between multiple first air outlets 201 can be made more uniform while meeting the high wind speed use requirements.

[0143] In this embodiment, in order to meet the demand for wind speed, the ventilation channel 20 can be arc-shaped along the wind flow direction. Fig. 20 and Fig.21 As shown in , the ventilation channel 20 is an arc-shaped structure, that is, the central axis of the ventilation channel 20 and the rotation central axis I of the fan 10 are not in a straight line.

[0144] It can be understood that when the maximum speed of the fan 10 is greater, the corresponding wind speed of the blown airflow is also greater, and the corresponding distance that the high-speed airflow generated by the fan 10 can be ejected is also farther. Therefore, setting the ventilation channel 20 in an arc shape and making the central axis of the ventilation channel 20 and the rotation center axis I of the fan 10 not in a straight line is more conducive to uniform air discharge, and thus the air discharged from the first air outlet 201 of the ventilation channel 20 can maintain a high wind speed and uniformity.

[0145] In some other embodiments, the ventilation channel 20 may be generally straight along the wind direction, and in this case, the first air outlet 201 is opened on the side wall of the ventilation channel 20. In this case, the air outlet direction F1 of the first air outlet 201 of the ventilation channel 20 may also be at a certain angle to the axial flow direction of the fan 10.

[0146] In some specific embodiments, Fig. 22 As shown in the figure, a duct boosting section 23 may be further provided between the first air duct 21 and the second air duct 22. The duct boosting section 23 plays a role in smoothly transitioning and connecting the first air duct 21 and the second air duct 22. At the same time, due to the smooth change of the curvature, the airflow sent from the second air duct 22 to the first air duct 21 can be gradually pressurized to achieve the desired air outlet effect.

[0147] like Fig. 22 As shown in the figure, a second air inlet 203 is provided at one end of the first air duct 21 close to the air duct pressurizing section 23, and a second air outlet 204 is provided at one end of the second air duct 22 close to the air duct pressurizing section 23. The length of the air duct pressurizing section 23 is 10mm-30mm, and specifically, the length of the air duct pressurizing section 23 can also be 15mm-25mm.

[0148] It can be understood that if the inner wall between the first air duct 21 and the second air duct 22 is smoothly connected, a better air outlet effect can be achieved. Fig. 22 and Fig.23 As shown in , the minimum angle b between the central axis P of the first air duct 21 along the airflow direction F2 and the extension line of the rotation center axis I of the fan 10 can also be limited to 15°-45°. Further, the minimum angle b can also be 15°-20°, or the minimum angle b can also be 20°-25°.

[0149] The rotation center axis I of the fan 10 is colinear with the center axis of the second air duct 22. It can be understood that the second air duct 22, the air duct pressurization section 23 and the inner wall of the first air duct 21 can guide the wind blown out by the fan 10 to a certain extent, so that the wind blown out by the fan 10 can be blown to a designated position when passing through the ventilation channel 20, which is conducive to more uniform air discharge at the multiple first air outlets 201 of the ventilation channel 20.

[0150] In some embodiments, a three-phase high-speed axial flow fan is used, which can make the rotation speed higher, the air volume of the fan 10 is larger, and the initial air velocity is higher, which can greatly improve the air outlet efficiency of the hanging neck fan, especially the hanging neck fan. At the same time, the three-phase high-speed axial flow fan has a wider wind speed adjustment range, can achieve stepless speed regulation of the air outlet effect, and make the hanging neck fan more adaptable.

[0151] The neck hanging fan 100 provided by the present invention adopts a high-speed axial flow fan to improve the stable, low-noise, high-speed airflow, and even after the uniform wind treatment, the wind speed of the first air outlet 201 can still be maintained at more than 4.8 meters per second, thereby reducing the influence of natural wind or other environmental wind on the wind output effect. It can be seen that the high-speed and efficient fan, the optimized fan blade shape and the appropriate airflow channel used in the present invention can provide strong wind while maintaining the uniformity of wind speed, so that the user can feel a comfortable wind feeling when wearing it, and there will be no local strong wind or unevenness. This fan is particularly suitable for use in outdoor activities or high temperature environments.

[0152] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A neck hanging fan, characterized in that: It includes a fan, a ventilation channel, and a first air inlet and a first air outlet connected to the ventilation channel, the fan is arranged in the ventilation channel, the fan runs and forms an airflow that penetrates the ventilation channel between the first air inlet and the first air outlet, and the direction of the rotation center axis of the fan is consistent with the direction of the airflow; at least two silencers are arranged in the ventilation channel, at least one of the silencers is arranged between the first air inlet and the fan, and at least another silencer is arranged between the fan and the first air outlet.

2. The neck hanging fan as claimed in claim 1, characterized in that: The fan includes a fan casing, a fan channel is arranged in the fan casing, and the fan also includes an impeller arranged in the fan channel and a high-speed three-phase motor. The impeller is connected to the rotating shaft of the high-speed three-phase motor. The high-speed three-phase motor drives the impeller to rotate and forms an airflow in the fan channel.

3. The neck hanging fan as claimed in claim 2, characterized in that: The fan housing includes an air inlet end and an air outlet end, and the silencer is arranged at the air inlet end and the air outlet end; or the silencer is arranged close to the air inlet end and the air outlet end.

4. The neck hanging fan as claimed in claim 3, characterized in that: The distance between the silencer and the air inlet end is 0.1-0.7 times the inner diameter of the fan casing; and / or the distance between the silencer and the air outlet end is 0.1-0.7 times the inner diameter of the fan casing; and / or the ratio between the inner diameter L3 of the silencer and the outer diameter L2 of the impeller of the fan is (0.95-1.05):

1.

5. The neck hanging fan as claimed in claim 3, characterized in that: The ratio of the inner diameter of the fan housing to the maximum outer diameter L1 of the impeller is in the range of 1.01-1.15; and / or the outer diameter L2 of the impeller is in the range of 14 mm-30 mm.

6. The neck hanging fan as claimed in claim 3, characterized in that: The impeller includes a hub and blades arranged on the edge of the hub. The hub is connected to the rotating shaft of the high-speed three-phase motor. The ratio of the outer diameter of the hub to the outer diameter of the impeller is 0.5-0.8, and the projections of adjacent blades along the wind flow direction at least partially overlap.

7. The neck hanging fan as claimed in claim 1, characterized in that: The ventilation passage includes a first air duct and a second air duct, the fan is arranged in the second air duct, a second air outlet is arranged at one end of the second air duct close to the first air duct, a first air inlet is arranged at one end of the second air duct away from the second air outlet, the first air duct is provided with the first air outlet, one of the silencers is arranged on the inner wall of the second air duct close to the first air inlet, and another of the silencers is arranged on the inner wall of the second air duct close to the second air outlet.

8. The neck hanging fan according to any one of claims 1 to 7, characterized in that: The silencer device comprises a support member and a silencer, wherein the support member is arranged between the inner wall of the ventilation passage and the silencer or the silencer passes through the support member.

9. The neck hanging fan as claimed in claim 8, characterized in that: The support member is an annular structure, and a space for accommodating at least a portion of the muffler is formed between the support member and the inner wall of the ventilation channel.

10. The neck hanging fan as claimed in claim 9, characterized in that: The support member includes any one of a plastic frame, a carbon fiber frame, and a nano material frame, or a combination of several of them; and / or the silencer includes any one of a silencer cotton, a sound-absorbing cotton, and a polyurethane foam, or a combination of several of them.

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