Neck-hung fan

Abstract

The invention relates to the field of portable heat dissipation, in particular to a neck-hanging fan which comprises a first air duct provided with a first air outlet, a fan and a second air duct containing the fan, and the second air duct and the first air duct are connected to form a ventilation channel with the air flow direction; a fan is arranged in the first air duct, the rotating center axis of the fan and the center axis of the first air duct in the air flow direction are arranged in an inclined mode, the fan comprises a high-speed three-phase motor, the working voltage of the high-speed three-phase motor is 3-6 V, the working current of the high-speed three-phase motor is 0.25-8 A, and the rated power of the high-speed three-phase motor is 1-10 W. The neck-hanging fan has the high-speed and uniform air outlet effect, and the problem that when an existing neck-hanging fan is used outdoors, the user experience feeling is poor is solved.

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 a representative of portable fans, neck fans are widely used in outdoor activities, sports and daily life. However, uneven air flow is a common technical problem in their use. Unlike traditional desktop fans or handheld fans, neck fans need to consider wearing comfort, wind speed and the structural design of the airflow concentration area at the same time.

[0003] As the requirements for high-speed wind from neck-mounted fans increase, uneven airflow distribution will affect the user's comfort, especially in high-temperature environments, where users may not be able to obtain a uniform cooling effect, resulting in a reduced user experience. [Summary of the invention]

[0004] In order to solve the problem of uneven air output resulting in poor user experience in the use scenarios 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 first air duct provided with a first air outlet, a fan and a second air duct accommodating the fan, the second air duct and the first air duct are connected to form a ventilation channel with a wind direction; the rotation center axis of the fan is inclined to the center axis of the first air duct along the wind direction, the fan includes a high-speed three-phase motor, the working voltage of the high-speed three-phase motor is 3V-6V, the working current of the high-speed three-phase motor is: 0.25A-8A, and the rated power of the high-speed three-phase motor is 1W-10W.

[0006] Preferably, the minimum angle between the central axis of rotation of the fan and the central axis of the first air duct along the wind flow direction is 15°-45°.

[0007] Preferably, an air duct boost section is provided between the first air duct and the second air duct, and the ratio of the length of the first air duct along the wind flow direction to the length of the air duct boost section along the wind flow direction is (1-10):1.

[0008] Preferably, the length of the air duct pressurization section along the wind flow direction is 10mm-30mm.

[0009] Preferably, the first air duct includes a hollow main body and an extension section arranged in the extension direction of the outer wall of the hollow main body, a main air duct is formed in the hollow main body, a secondary air duct is formed between the extension section and the outer wall of the hollow main body, the main air duct and the secondary air duct are connected, and the first air outlet is arranged at the air outlet of the secondary air duct.

[0010] Preferably, at least one guide plate is arranged between the inner wall of the extension section and the outer wall of the hollow body.

[0011] Preferably, the minimum angle between the guide plate and the wind flow direction in the first air duct is 45°-65°.

[0012] Preferably, a groove is provided on the outer wall of the hollow body, and the guide plate is at least partially embedded in the groove, and an air flow branch is formed between the guide plate, the outer wall of the hollow body and the inner wall of the extension section.

[0013] Preferably, a guide member is further provided on a side close to the extension section, and the guide member is along the extension section and connected to the outer wall surface of the hollow body.

[0014] Preferably, the cross-sectional shape of the first air duct along the direction perpendicular to the wind flow direction is an inverted “の” shape or an “e” shape.

[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 comprises a first air duct provided with a first air outlet, a fan and a second air duct accommodating the fan, wherein the second air duct and the first air duct are connected to form a ventilation channel with a wind flow direction; the rotation center axis of the fan and the center axis of the first air duct along the wind flow direction are inclinedly arranged, such an arrangement can prevent the high-speed airflow from blowing directly to the first air outlet, and the neck-hanging fan can meet the demand for uniform air outlet by setting the ventilation channel and setting the angle between the air outlet and the gas generation direction.

[0017] Furthermore, the present invention further limits the fan of the neck-hanging fan to include a high-speed three-phase motor, the operating voltage of the high-speed three-phase motor is 3V-6V, the operating current of the high-speed three-phase motor is 0.25A-8A, and the rated power of the high-speed three-phase motor is 1W-10W. By limiting the motor type, it is beneficial to provide high-speed airflow for the neck-hanging fan. At the same time, the neck-hanging fan further limits the high-speed airflow blown out from the first air outlet, thereby reducing the influence of the surrounding environment and the use environment on the air outlet effect, so as to improve the user experience.

[0018] 2. The minimum angle between the central axis of the first air duct along the airflow direction and the extension line of the rotation center axis of the fan is set to 15°-45°, which can avoid direct blowing of the axial wind generated by the fan. Since there is a certain angle between the high-speed axial wind generated by the fan and the first air duct, it will have a certain blocking and diversion effect on the high-speed wind blown by the fan, and thus part of the airflow can be blown out from the air outlet close to one side of the fan, among which a part of the airflow can be delivered to the far end of the first air duct to meet the demand for high-speed and uniform air outlet.

[0019] 3. A second air inlet is provided at one end of the first air duct close to the second air duct, and an air duct boosting section is provided between the second air outlet and the second air inlet, the inner diameter of the cross-section of the air duct boosting section perpendicular to the wind flow direction gradually decreases, and the ratio of the length of the first air duct along the wind flow direction to the length of the air duct boosting section along the wind flow direction is (1-10):1. Based on the above structural limitation, the airflow delivered by the second air duct to the first air duct is gradually pressurized to achieve the desired air outlet effect.

[0020] 4. Furthermore, the length of the air duct pressurization section along the wind direction is 10mm-30mm. Based on the setting of the air duct pressurization section, the wind blown by the fan can enter the first air duct more smoothly, and the flowing air is pressurized during the entry process, meeting the requirements of the hanging neck fan with small size and high wind speed.

[0021] 5. The first air duct is defined as including a hollow main body and an extension section arranged in the extension direction of the outer wall of the hollow main body, and a main air duct is formed in the hollow main body, and a secondary air duct is formed between the extension section and the outer wall of the hollow main body, wherein the main air duct and the secondary air duct are connected, and the first air outlet is arranged at the air outlet of the secondary air duct. Through such an arrangement, the demand for high-speed and uniform air outlet can be met, and at the same time, a good connection relationship can be formed between the main air duct and the secondary air duct, thereby avoiding the occurrence of vortices and reducing the generation of noise at the same time.

[0022] 6. At least one guide plate is arranged between the inner wall of the extension section and the outer wall of the hollow main body. The setting of the guide plate can further divide the auxiliary air duct, so as to further divide the first air outlet into multiple independent air outlets, thereby avoiding interference between the multiple air outlets. The setting of the guide plate can make the airflow produce a wall attachment effect, thereby better guiding the airflow.

[0023] 7. In some embodiments, the minimum angle between the guide plate and the wind flow direction is 45°-65°; and / or the side of the guide plate facing the air inlet direction is concave; and / or a groove is provided on the outer wall of the hollow main body, and the guide plate is at least partially embedded in the groove. An air flow branch is formed between the guide plate, the outer wall of the hollow main body and the inner wall of the extension section, which can keep the wind speed difference between the multiple first air outlets within ±10%, thereby further meeting the demand for uniform air outlet on the basis of ensuring high wind speed.

[0024] 8. A guide is also provided on one side close to the extension section. The guide runs along the extension section and is connected to the outer wall of the hollow body, so that the airflow blown out from the first air outlet of the auxiliary air duct can continue to be guided toward the face and head of the human body. Specifically, the guide can form a guide channel between the guide and the outer wall of the hollow body, and the airflow blown out from the first air outlet will form a wall attachment effect on the side of the guide facing the hollow body, thereby making the airflow blown out from the first air outlet of the auxiliary air duct more concentrated toward the face and head of the user, thereby improving the air outlet efficiency and the comfort of use.

[0025] 9. In some specific embodiments, the cross-sectional shape of the first air duct perpendicular to the wind flow direction is an inverted "の" shape or an "e" shape, so that the airflow in the first air duct can be spirally discharged, thereby meeting the high-speed and uniform air discharge mode. Based on this air duct structure, the wind speeds blown out by multiple first air outlets arranged along the length direction of the first air duct can be basically the same, so as to meet the user's various needs for wind speed and comfort.

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 one of the schematic diagrams of the air inlet and air outlet air flow directions of the neck hanging fan shown in some embodiments of the present invention.

[0028] Figure 2 yes Figure 1 A three-dimensional schematic diagram of a neck-hanging fan is shown.

[0029] Figure 3 yes Figure 1 The left view of the hanging neck fan and one of the simulation schematics of the internal wind flow direction shown in.

[0030] Figure 4 yes Figure 1 The left view of the hanging neck fan and the second schematic diagram of the simulation of the internal wind flow direction are shown in FIG.

[0031] Figure 5 yes Figure 1 A partial exploded diagram of the neck-hanging fan shown in FIG.

[0032] Figure 6 yes Figure 1 A schematic cross-sectional view of a neck-hanging fan is shown.

[0033] Figure 7 yes Figure 6 The diagram shows the wind flow direction of the hanging neck fan in the cross-sectional schematic state.

[0034] Figure 8 yes Figure 7 The cross-sectional schematic diagram of the hanging neck fan along the AA direction is shown in FIG.

[0035] Fig. 9 yes Figure 7 The cross-sectional schematic diagram of the neck-hanging fan along the BB direction is shown in .

[0036] Fig.10 1 is a schematic cross-sectional view of a neck hanging fan in a first air duct shown in some embodiments.

[0037] Fig.11 yes Fig.10 An enlarged schematic diagram of point E is shown in FIG.

[0038] Fig.12 It is a schematic diagram of the air inlet and outlet states of a neck hanging fan provided with a third air outlet.

[0039] Fig.13 yes Figure 6 A schematic diagram of a guide plate is provided in the first air duct of a neck-hanging fan as shown in FIG.

[0040] Fig.14 yes Fig.13 FIG. 5 is a schematic structural diagram of an explosion state of an extended section of the first air duct shown in FIG.

[0041] Fig.15 Schematic diagrams of neck-hanging fans in other embodiments.

[0042] Fig.16 for Fig.15 A schematic diagram of the relevant structure of the first air duct of the neck hanging fan is shown in FIG.

[0043] Fig.17 It is a schematic diagram of the three-dimensional structure of the fan of the neck hanging fan in some specific implementation methods.

[0044] Fig.18 yes Fig.17 Schematic diagram of axial disassembly structure of the fan shown in;

[0045] Fig.19 yes Fig.18 The schematic diagram of the structure of the impeller from an upward angle is shown in FIG.

[0046] Fig. 20 yes Fig.18 The schematic diagram of the structure of the impeller from a top view shown in FIG.

[0047] Fig.21 yes Fig.18The main view angle structural diagram of the impeller shown in FIG.

[0048] Fig. 22 yes Fig.21 A schematic diagram of the structure of the impeller at another angle shown;

[0049] Fig.23 yes Figure 6 An enlarged schematic diagram of the D position of the middle hanging neck fan to show the silencer device in the hanging neck fan and its installation position;

[0050] Fig.24 yes Fig.23 A schematic diagram of the structure of the support member and the silencer member in the silencer device in the axial explosion state is shown.

[0051] Fig.25 yes Fig.23 A schematic structural diagram of the support member and the first air inlet cover in the silencer device shown.

[0052] Fig.26 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.

[0053] Description of the accompanying drawings:

[0054] 100. Neck fan;

[0055] 10. Fan; 11. Hub; 12. Blade; 121. Blade top; 122. Blade root; 13. High-speed three-phase motor; 130. Control circuit; 14. Fan housing; 15. Protective part; 151. Matching part; 19. Impeller;

[0056] 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; 205, third air outlet; 23, air duct pressurization section; 231, transition surface; T1, maximum inner diameter of the cross section of the first air duct perpendicular to the air flow direction; T2, maximum inner diameter of the cross section of the second air duct perpendicular to the air flow direction;

[0057] 30. Silencer; 31. Support; 32. Silencer;

[0058] 40. cold compress device; 41. cold compress housing; 42. cold compress part;

[0059] F 1. The air outlet direction of the neck-mounted fan; F2. The air flow direction in the air duct;

[0060] 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;

[0061] 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;

[0062] c. the minimum angle between the guide plate 210 and the wind flow direction F2 in the first air duct;

[0063] I. The central axis of rotation of the fan 10;

[0064] L2, outer diameter of impeller 10;

[0065] θ, the outlet wing angle of the blade top 121;

[0066] b1, the distance between the tops 121 of two adjacent blades 12; b2, the distance between the roots 122 of two adjacent blades 12;

[0067] S1, the maximum diameter surface of the first air duct 21 perpendicular to the wind flow direction; S2, the maximum diameter surface of the second air duct 22 perpendicular to the wind flow direction;

[0068] P, the central axis of the first air duct along the airflow direction;

[0069] 50. Control module;

[0070] 60. Driver module. [Specific implementation method]

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Please combine Figure 1 and Figure 2 The first embodiment of the present invention provides a neck hanging fan 100, comprising at least one fan 10 and at least one ventilation channel 20, wherein the fan 10 is arranged in the ventilation channel 20, and when the fan 10 is running, the wind in the same direction as the rotation axis of the fan 10 is generated, and the generated axial flow direction of the wind is further blown out through the ventilation channel 20. The fan 10 can generate high-speed wind when running at a high speed.

[0077] like Figure 1 As shown in , the neck-hanging fan 100 is a neck-hanging fan, which can be used for the neck of a human body so that the wind blown out by 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.

[0078] like Figure 2 As shown in , the ventilation channel 20 further includes a first air duct 21 and a second air duct 22, wherein the fan 10 is arranged in the second air duct 22, and the first air outlet 201 is arranged on the first air duct 21. The second air duct 22 is provided with a first air inlet 202 at one end away from the first air duct 21.

[0079] 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. Figure 3 As shown in the figure, the second air duct 22 and the first air duct 21 are connected to form a ventilation channel 10 with a wind flow direction, and the rotation center axis I of the fan 10 is inclined to the center axis P of the first air duct 21 along the wind flow direction.

[0080] Furthermore, if Figure 2 and Figure 3 As shown in , in order to achieve a better uniform wind effect, 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 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°.

[0081] 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. Figure 3 As 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.

[0082] 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°.

[0083] 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.

[0084] 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°. Figure 4 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°.

[0085] like Figure 2 and Figure 4 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 outlets 201 distributed on the ventilation channel 20 and blown out from the first air outlets 201, and the other part will be blown out directly from the first air outlets 201. Through the above-mentioned structural setting, the demand for high wind speed use can be met while making the air outlet speed between multiple first air outlets 201 more uniform.

[0086] 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. Figure 2 and Figure 5 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.

[0087] 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 uniform air discharge.

[0088] In some other embodiments, the ventilation channel 20 may be in a straight line along the wind direction, and the first air outlet 201 is provided 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. In this embodiment, in order to meet the air outlet requirements in different application scenarios, such as Figure 5 As shown in the figure, at least two first air outlets 201 are provided on the ventilation channel 20. The first air outlets 201 can be arranged in the length direction of the ventilation channel 20 at one end away from the fan 10. The fan 10 runs at a speed greater than 15,000 revolutions per minute, and the wind speed of the airflow blown out from the first air outlets 201 reaches more than 4 meters per second.

[0089] 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 duct 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 duct 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.

[0090] More preferably, the rotation speed of the fan 10 can reach more than 15,000 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.

[0091] Specifically, the rotation speed of the fan 10 can reach more than 30,000 revolutions per minute. In some embodiments, the ratio of the wind speed of the airflow generated by the fan 10 to the wind speed of the first air outlet 201 can be limited to (2-4):1.

[0092] Combination Figure 5 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.

[0093] like Figure 5 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.

[0094] 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 quickly passes through the air duct and is blown out through the first air outlet. Figure 3 and Figure 4As 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.

[0095] In some specific embodiments, Figure 6 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.

[0096] Combination Figure 3 and Figure 6 As shown in the figure, the central axis of the air duct boosting section 23 along the wind flow direction is inclined with the rotation central axis I of the fan 10 and the central axis P of the first air duct 21 along the wind flow direction. In this embodiment, the air duct boosting section 23 serves to connect the second air duct 22 with the first air duct 21.

[0097] like Figure 6 As shown in FIG. 1 , 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 .

[0098] The ratio of the length of the first air duct 21 along the wind flow direction to the length of the air duct boosting section 23 along the wind flow direction is (1-10): 1. Specifically, the ratio of the length of the first air duct 21 along the wind flow direction to the length of the air duct boosting section 23 along the wind flow direction is 1:1, 2:1, 3:1, 4:1...7:1, 8:1, 9:1, 10:1.

[0099] Further, in some specific embodiments, the length of the air duct boost section 23 is 10mm-30mm. Specifically, the length of the air duct boost section 23 along the wind flow direction can also be 15mm-25mm. Further, the length of the air duct boost section 23 along the wind flow direction can also be 18mm-20mm.

[0100] 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.

[0101] Specifically, Figure 7 , Figure 8 and Fig. 9 As shown in the figure, the maximum diameter surface S1 of the first air duct 21 perpendicular to the wind flow direction is comparable to the minimum diameter surface S2 of the second air duct 22 perpendicular to the wind flow direction. Specifically, the ratio of the maximum diameter surface S1 of the first air duct 21 perpendicular to the wind flow direction to the minimum diameter surface S2 of the second air duct 22 perpendicular to the wind flow direction is 0.9-1.2. Furthermore, the ratio of the two can also be 0.95-1.

[0102] It can be understood that in the present technical field, the relationship between air volume, wind speed and pipe cross-sectional area (that is, the radial surface perpendicular to the wind flow direction) can be expressed as:

[0103] Q = V × A;

[0104] Wherein, Q represents the maximum air volume generated by the fan 10 , V represents the maximum wind speed of the fan 10 , and A represents the maximum radial surface area of ​​the first air duct 21 .

[0105] In this embodiment, the wind speed blown out from the fan 10 reaches 12 meters per second to 18 meters per second, the cross-sectional area of ​​the first air duct 21 is 230 square millimeters to 260 square millimeters, and the corresponding hollow volume of the first air duct 21 is 30,000 to 40,000 cubic millimeters.

[0106] It can be seen that when the area of ​​the maximum diameter surface S1 of the first air duct 21 is comparable to the area of ​​the maximum diameter surface S2 of the second air duct 22 , the wind speed and air volume of the airflow flowing in the first air duct 21 and the second air duct 22 are also comparable.

[0107] like Fig. 9 As shown in the figure, the cross-sectional shape of the second air duct 22 along the direction perpendicular to the wind flow is circular, and its shape matches the fan 10, which is beneficial for the fan 10 to suck air backflow and increase the air intake; and the cross-sectional shape of the first air duct 21 along the direction perpendicular to the wind flow is flat, so that the airflow generated by the fan 10 is pressurized and diverted in the first air duct 21, which can further enhance the air outlet effect and make the air outlet more uniform.

[0108] In order to avoid unnecessary eddy currents or noises due to the different cross-sectional shapes of the second air duct 22 and the first air duct 21 when they are connected, an eddy current effect is easily formed at the second air inlet 203 of the first air duct 21 when high-speed wind passes through. Figure 6 and Figure 7 The air duct pressurizing section 23 plays a role in smoothly transitioning and connecting the first air duct 21 and the second air duct 22. In order to reduce the generation of gas vortex, in this embodiment, a smooth transition surface 231 is formed on the inner wall of the air duct pressurizing section 23, and the curvature of the transition surface 231 gradually decreases from the second air duct to the first air duct. The curvature range is 0.12-0.7.

[0109] It can be understood that the setting of the transition surface 231 of the air duct boosting section 23 can make the second air duct 22 and the inner wall surface of the first air duct 21 smoothly connected, so that the wind can produce a wall attachment effect, so that the wind will not be blocked while the wind is pressurized, and the noise generated by the poor wind flow can also be reduced.

[0110] Continue to combine Figure 8 and Fig. 9 In order to further increase the wind pressure blowing into the first wind duct 21, the maximum inner diameter T2 of the cross section of the second wind duct 22 perpendicular to the wind flow direction can be made smaller than the maximum inner diameter T1 of the cross section of the first wind duct 21 perpendicular to the wind flow direction. Figure 8 As shown in , the cross-sectional shape of the first air duct 21 along the direction perpendicular to the wind flow is flat, and the corresponding maximum inner diameter T1 ranges from 28 mm to 50 mm. Fig. 9 As shown in FIG. 1 , the cross-sectional shape of the second air duct 22 along the direction perpendicular to the wind flow direction F2 is circular, and the corresponding maximum inner diameter T2 is in the range of 25 mm-40 mm.

[0111] Further integration Figure 8 as well as Fig.10 , the cross-sectional shape of the first air duct 21 along the direction perpendicular to the wind flow is a flat “の” shape. Specifically, the first air duct 21 includes a hollow body 211 and an extension section 212, wherein the extension section 212 is formed by extending the outer wall of the hollow body 211, a main air duct 2111 is formed in the hollow body 211, and a secondary air duct 2112 is formed between the extension section 212 and the outer wall of the hollow body 211, and the main air duct 2111 and the secondary air duct 2112 are connected.

[0112] The volume of the main air duct 2111 is greater than the volume of the auxiliary air duct 2112, and a distance is provided between the connecting opening between the main air duct 2111 and the auxiliary air duct 2112 and the first air outlet 201, so that the air is continuously compressed during the process of the main air duct 2111 supplying air to the first air outlet 201, and the air flow can be blown out from the first air outlet 201. Specifically, the distance is 1-3 times the width of the connecting opening between the main air duct 2111 and the auxiliary air duct 2112, such as 1.3 times, 1.5 times, 1.8 times, 2 times, etc.

[0113] like Figure 8 and Fig.10 As shown in the figure, when the wind blown out by the fan 10 enters the first air duct 21 through the air duct boosting section 23, a part of the wind will first be delivered to the far end of the first air duct 21 and then flow back, and after forming an inverted "の" shape or a rotating "e" shape, it enters the auxiliary air duct 2112 from the main air duct 2111, and is further blown out from the first air outlet 201 provided at the air outlet of the auxiliary air duct 2112.

[0114] See also Fig.11 The maximum inner diameter a1 of the secondary air duct 2112 is smaller than the maximum inner diameter a2 of the main air duct 2111. The width of the air duct gradually decreases along the blowing direction of the wind, and the wind can be gradually pressurized during the blowing process, thereby increasing the wind speed of the first air outlet 201.

[0115] Continue as Fig.11 As shown in , the width of the connection between the main air duct 2111 and the auxiliary air duct 2112 is represented as width K1, and the width of the first air outlet 201 is represented as width K2, and the width K1 is greater than the width K2.

[0116] Specifically, the width K1 is 4 mm to 7 mm, and the width K2 is 1 mm to 3 mm.

[0117] In some embodiments, the maximum inner diameter a1 of the auxiliary air duct 2112 is the same as the width K1, and both are used to limit the entrance into the auxiliary air duct 2112, which allows the airflow to gradually increase pressure and flow out after entering the auxiliary air duct 2112, thereby further improving the air outlet speed and stability of the first air outlet 201.

[0118] The ratio of the width K2 of the first air outlet 201, the width K1 of the connecting opening between the main air duct 2111 and the auxiliary air duct 2112, and the maximum inner diameter T1 of the cross section of the first air duct perpendicular to the wind flow direction is 1:(2-5):(3-10). Specifically, the ratio of the width K2 of the first air outlet 201, the width K1 of the connecting opening between the main air duct 2111 and the auxiliary air duct 2112, and the maximum inner diameter T1 of the cross section of the first air duct perpendicular to the wind flow direction can be 1:2:3 or 1:3:5 or 1:4:8.

[0119] The purpose of setting the relevant ratio is to ensure that when the wind enters the auxiliary air duct 2112 from the main air duct 2111 and is blown out from the first air outlet 201, the wind pressure gradually increases under the premise of the same air volume because the channel and the outlet gradually become smaller.

[0120] Continue as Fig.10 , Fig.11 as well as Fig.12 As shown in , a guide 213 is also provided on a side close to the extension section 212. The guide 213 is along the extension section 212 and connected to the outer wall of the hollow body 211, so that the airflow blown out from the first air outlet 201 of the auxiliary air duct 2112 can be further guided toward the face and head of the human body. Specifically, the guide 213 can form a guide channel with the outer wall of the hollow body 211, and the airflow blown out from the first air outlet 201 will form a wall attachment effect on the side of the guide 213 facing the hollow body 211, so that the airflow blown out from the first air outlet 201 of the auxiliary air duct 2112 can be more concentratedly blown toward the face and head of the user, thereby improving the air outlet efficiency and the comfort of use. The guide 213 and the hollow body 211 can be integrally formed or separately arranged. When the two are separately arranged, the guide 213 can be fixed to the outer wall of the hollow body 211 by means of clamping, screw connection, etc.

[0121] Continue as Fig.12 As shown in , a third air outlet 205 is further provided at one end of the first air duct 21 away from the fan 10. The third air outlet 205 is opened on the wall of the hollow body 211. The opening of the third air outlet 205 can provide wind to the back of the human neck, thereby providing the user with a more comfortable and comprehensive heat dissipation experience, and avoiding the situation where the user's neck is stuffy when wearing a neck-hanging fan. Fig.12 As shown, the direction indicated by the arrow is the flow direction of the neck hanging fan 100.

[0122] See also Fig.13In order to make the wind speed of the first air outlet 201 higher and the air outlet more uniform, at least one guide plate 210 is provided between the inner wall of the extension section 212 and the outer wall of the hollow body 211. It can be understood that the outer wall of the hollow body 211, the inner wall of the extension section 212 and the guide plate 210 form a plurality of first air outlets 201. The first air outlets 201 are arranged along the arc length direction of the first air duct 21. Thus, the first air duct 21 can be made to discharge air more uniformly.

[0123] See also Fig.13 , the spacing d between the multiple adjacent guide plates 210 is equal, wherein the spacing d is defined as the distance between two guide plates 210 along the arc direction of the first air duct 21. It can be understood that in some embodiments, in order to meet the different lengths of the first air duct 21 or different air outlet requirements, the distance between the guide plates 210 can also be adjusted based on the wind speed, which is only used as an example and not as a limitation of the present invention. Fig.13 As shown in , the spacing d is 15mm-25mm, and specifically, the spacing can also be specifically 18mm.

[0124] See also Fig.14 Furthermore, in order to make the wind outlet effect of the neck hanging fan better, the minimum angle c between the guide plate 210 and the wind flow direction F2 in the first air duct is 45°-65°. The wind generated by the fan 10 enters the first air duct 21 through the air duct booster section 23. Since the guide plate 210 is set at an angle to the wind flow direction, the wind passing through the first air duct 21 will be partially blocked by the guide plate 210 and then diverted. Specifically, the minimum angle c between the guide plate 210 and the wind flow direction F2 in the first air duct is 50°-55°.

[0125] like Fig.14 As shown in the figure, the side of the guide plate 210 facing the wind flow direction in the first air duct is a concave surface, and the concave surface can better guide the wind flow to the first air outlet 201. Such a setting can prevent the formation of vortices on the side of the guide plate 210 away from the wind inlet direction after the wind in the first air duct 21 is diverted and led out, thereby further improving the smoothness of the wind flow in the first air duct 21 and reducing the generation of noise.

[0126] Further integration Fig.11 , Fig.13 and Fig.14As shown in , in order to make the overall structure of the first air duct 21 more stable and facilitate molding and assembly during the manufacturing process, a groove 2113 is provided on the outer wall of the hollow body 211, and the guide plate 210 is at least partially embedded in the groove 2113. The groove 2113 provides positioning support for the guide plate 210, so that the structure of the first air duct 21 is more stable. Then, an air flow branch is formed between the guide plate 210, the outer wall of the hollow body 211 and the inner wall of the extension section 212, so as to better supply air to the face and head of the human body.

[0127] like Fig.15 and Fig.16 As shown in , in some other embodiments of the present invention, the first air outlet 201 is arranged at the top of the first air duct 21 facing the human face. Specifically, taking the cross section perpendicular to the wind flow direction as the reference surface, the guide plate 210 includes a blocking surface 210A arranged parallel to the reference surface and a guiding surface 210B perpendicular to the reference surface, and the blocking surface 210A and the guiding surface 210B form an "L"-shaped structure, wherein the opening side of the "L" is arranged toward the fan 10. The wind delivered by the fan 10 is gradually diverted via the guiding surface 210B, and gradually turns to the first air outlet 201 via the blocking surface 210A.

[0128] like Fig.15 and Fig.16 As shown in, the blocking surface 210A and the guiding surface 210B are both arranged close to the first air outlet 201, wherein the blocking area of ​​the blocking surface 210A of the plurality of guide plates 210 changes and increases successively along the wind flow direction, and the guiding surface 210B of the guide plate 210 is defined as the setting height of the guiding surface 210B in the direction of vertical extension from the first air outlet 201 to the first air duct 21, and the setting height of the guiding surface 210B gradually decreases, that is, the closer to the fan 10, the smaller the volume occupied by the guide plate 210 in the first air duct 21. Such a setting can enable the wind to be better diverted more evenly along the wind flow direction in the first air duct 21 to meet the air outlet demand.

[0129] See also Fig.17 In some embodiments, the three-phase high-speed axial flow fan has a high speed, a large air volume, and a higher initial air velocity, 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, which can achieve stepless speed regulation of the air outlet effect, making the hanging neck fan more adaptable.

[0130] Further combined with Fig.18 and Fig.19The fan 10 includes a hub 11 connected to the central rotating shaft of the fan 10, blades 12 arranged on the outer periphery of the hub 11, and a high-speed three-phase motor 13 connected to one end of the central rotating shaft 111 away from the hub 11, and the central rotating shaft 111 is consistent with the wind flow direction. The outer diameter L2 of the impeller 19 formed by the hub 11 and the blades 12 is 14mm-30mm, specifically, the outer diameter L2 of the impeller 19 can be further 18mm-22mm, and the outer diameter L2 of the impeller 19 can also be 20mm.

[0131] The use of the impeller 10 within the above outer diameter range can meet the use requirements of a miniaturized fan 10 and can maintain high-speed and stable operation of the fan 10 .

[0132] Combination Fig.19 As 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.

[0133] like Fig. 20 As shown in FIG. 1 , the projections of the adjacent fan blades 12 along the wind flow direction at least partially overlap.

[0134] Furthermore, combined with Fig. 20 , Fig.21 and Fig. 22 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.

[0135] Specifically, see Fig. 22 As shown in the figure, the spacing b1 between the blade tops 121 of two adjacently arranged blades 12 is 2.5mm-5mm, and the spacing b2 between the blade roots 122 of two adjacently arranged 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 roots 122 is 4mm-5mm.

[0136] 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.

[0137] 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.

[0138] Continue reading Fig.18 The high-speed three-phase motor 13 has a higher rotation speed, the initial velocity of the air flow blown out by the fan 10 is higher, and the blowing effect is better.

[0139] In some embodiments, Fig.18 As shown in , the fan 10 also includes: a wind shell 14, and the air inlet and the air outlet are respectively opened at opposite ends of the wind shell 14. The wind shell 14 can wrap the fan blades 12 and the high-speed three-phase motor 13 in the fan 10. The wind shell 14 can constrain the airflow generated by the fan blades 12, so that the airflow blown out by the fan 10 has the minimum lateral movement kinetic energy. 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 wind shell 14, which can also enhance the safety of the fan blades 12 and avoid the problem of the fan blades 12 leaking out and contacting with other components arranged in the second air duct 22 to cause damage. The setting of the wind shell 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 needs of high-speed operation, and can also reduce the overall noise of the fan 10.

[0140] 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 can reach 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 high-speed three-phase 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, or even below 65db. The noise sound pressure in the second air duct 22 is on the fan blades 12, the high-speed three-phase motor 13 and other structures. Therefore, in order to reduce the noise, Fig.23 As shown in FIG. 8 , a silencer 30 may be provided in the second air duct 22 .

[0141] like Fig.23 As shown, a silencer 30 is provided on an inner wall of the second air duct 22 close to the first air inlet 202 and / or an inner wall of the second air duct 22 close to the second air outlet 204 .

[0142] like Fig.23 As shown in , the silencer 30 is disposed on one side of the second air duct 22 close to the first air inlet 202 and on one side of the second air duct 22 close to the second air outlet 204 .

[0143] It is understandable that based on the model of the selected high-speed three-phase motor 13 or the different noise requirements of the neck-hanging fan 100, in some other specific embodiments, the silencer 30 can be set only on the side close to the first air inlet 202 or the second air outlet 204.

[0144] like Fig.23 As shown in , the muffler device 30 further includes a support member 31 and a muffler 32. The support member 31 can provide fixed support for the muffler 32. Specifically, the support member 31 is disposed between the inner wall of the second air duct 22 and the muffler 32.

[0145] In some other embodiments, the support member 31 is arranged on the inner wall of the second air duct 22, and the silencer 32 is passed through the support member 31, that is, the support member 31 is formed first, and then the silencer 32 is formed on the support member 31 or inserted into the silencer 32, and the support member 31 is equivalent to providing a skeleton structure for the silencer 32.

[0146] 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 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., and specifically includes at least one or a combination of the following: sound-absorbing cotton: such as polyester fiber cotton and 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 vibration isolation 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 surface of the fan to increase the sound absorption performance.

[0147] Continue reading Fig.23 and Fig.25As 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.

[0148] Please refer to Fig.26 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] As an embodiment, when the operating voltage of the high-speed three-phase motor 13 is 3 volts to 6 volts, the operating current of the high-speed three-phase motor 13 is 0.12 amps to 2 amps, and / or the rated operating power of the high-speed three-phase motor 13 is 1 watt to 9 watts, the control module 50 controls the rated operating speed of the high-speed three-phase motor 13 to 6000-45000 revolutions per minute through the drive module 60 according to the operating voltage, operating current and / or rated operating power.

[0153] 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 0.8 watts to 9 watts, which meets the power requirements of the portable fan. The control module 50 monitors the operating 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. Its speed can also be above 41000 revolutions per minute, such as 42000 revolutions per minute and 45000 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.

[0154] 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 1 watt-8 watts, meeting 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 15000-41000 revolutions per minute. 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.

[0155] 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.

[0156] 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.

[0157] 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 prevent the human ear from capturing high-frequency sounds, thereby further improving the comfort of using the neck hanging fan.

[0158] The present invention provides a neck hanging fan, which comprises a fan, a ventilation channel, and a first air inlet and a first air outlet connected to the ventilation channel, the fan is arranged between the first air inlet and the first air outlet, the ventilation channel is opened to form the first air outlet, the fan runs and forms an airflow between the first air inlet and the first air outlet; the working voltage of the high-speed three-phase motor is 3 volts-6 volts, the working current of the high-speed three-phase motor is: 0.25 amps-8 amps, and the rated power of the high-speed three-phase motor is 1 watt-10 watts, which limits the type of motor and is conducive to providing high-speed airflow for the neck hanging fan. At the same time, the neck hanging fan further limits the wind speed of the airflow blown out from the first air outlet to more than 4 meters per second, so as to realize high-speed air outlet of the neck hanging fan, reduce the influence of the surrounding environment and the use environment on the air outlet effect, so as to further improve the user experience.

[0159] 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 first air duct with a first air outlet, a fan and a second air duct accommodating the fan, the second air duct and the first air duct are connected to form a ventilation channel with a wind direction; the rotation center axis of the fan is inclined to the center axis of the first air duct along the wind direction, the fan includes a high-speed three-phase motor, the working voltage of the high-speed three-phase motor is 3V-6V, the working current of the high-speed three-phase motor is: 0.25A-8A, and the rated power of the high-speed three-phase motor is 1W-10W.

2. The neck hanging fan according to claim 1, characterized in that: The minimum angle between the central axis of rotation of the fan and the central axis of the first air duct along the wind flow direction is 15°-45°.

3. The neck hanging fan according to claim 1, characterized in that: A duct boost section is provided between the first duct and the second duct, and the inner diameter of the cross-section of the duct boost section perpendicular to the wind flow direction gradually decreases. The ratio of the length of the first duct along the wind flow direction to the length of the duct boost section along the wind flow direction is (1-10):

1.

4. The neck hanging fan as claimed in claim 3, characterized in that: The length of the air duct pressurization section along the wind flow direction is 10mm-30mm.

5. The neck hanging fan as claimed in claim 1, characterized in that: The first air duct includes a hollow main body and an extension section arranged in the extension direction of the outer wall of the hollow main body. A main air duct is formed in the hollow main body, and a secondary air duct is formed between the extension section and the outer wall of the hollow main body. The main air duct and the secondary air duct are connected, and the first air outlet is arranged at the air outlet of the secondary air duct.

6. The neck hanging fan as claimed in claim 5, characterized in that: At least one guide plate is arranged between the inner wall of the extension section and the outer wall of the hollow body.

7. The neck hanging fan as claimed in claim 6, characterized in that: The minimum angle between the guide plate and the wind flow direction in the first air duct is 45°-65°.

8. The neck hanging fan as claimed in claim 6, characterized in that: A groove is provided on the outer wall of the hollow body, and the guide plate is at least partially embedded in the groove. An air flow branch is formed between the guide plate, the outer wall of the hollow body and the inner wall of the extension section.

9. The neck hanging fan as claimed in claim 5, characterized in that: A guide member is also provided on a side close to the extension section. The guide member is along the extension section and connected to the outer wall surface of the hollow body.

10. The neck hanging fan according to any one of claims 1 to 9, characterized in that: The cross-sectional shape of the first air duct along the direction perpendicular to the wind flow direction is an inverted "の" shape or an "e" shape.

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