Neck hanging type fan

Abstract

The utility model relates to the technical field of fans, in particular to a neck-hanging type fan. The utility model discloses a neck-hanging type fan, which comprises a neck-wearing frame, the fans are arranged on the inner sides of the two ends of the neck-wearing frame; the air duct is arranged in the neck wearing frame, the fan is arranged in the air duct, the two ends of the air duct are connected with a plurality of air inlets and a plurality of air outlets respectively, the air inlets are formed in the positions, corresponding to the fan, of the end of the neck wearing frame, and the air outlets are formed in the neck wearing frame and extend in the length direction of the neck wearing frame or are formed at intervals; the grid assembly is arranged in the air duct and close to the air outlet side of the fan, the grid assembly comprises a first grid and a second grid which are coaxially arranged, the first grid is provided with a plurality of first flow deflectors, the second grid is provided with a plurality of second flow deflectors, and the first flow deflectors and the second flow deflectors are arranged in a staggered mode in the axial direction. The utility model has the advantages that the noise is reduced and the wind power can be improved.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a neck-hanging fan. Background Technology

[0002] Neck fans, which hang around a user's neck, move with the user and free the user's hands, making them suitable for warehouses, kitchens, and outdoors. For example, Chinese patent application number 202320179041.6 discloses a neck fan with multiple airflow angles, including: a neck support frame comprising two housing components and a neck support component, the connecting ends of the two housing components being respectively connected to the neck support component, and the free ends of the housing components having air inlets; and several air outlets extending along the length of the neck support frame, allowing the entire neck to be exposed to the wind.

[0003] However, it has been found that when the airflow of a neck fan needs to be increased, the fan noise also increases due to the increased fan speed, which affects the user experience. Utility Model Content

[0004] To address the shortcomings of existing technologies, a neck-mounted fan that reduces noise and increases airflow is provided.

[0005] This utility model is achieved using the following technical solution: a neck-hanging fan, comprising: a neck frame; a fan disposed on the inner sides of both ends of the neck frame; an air duct disposed within the neck frame, wherein the fan is disposed within the air duct, and both ends of the air duct are respectively connected to a plurality of air inlets and a plurality of air outlets, wherein the air inlets are disposed at the ends of the neck frame corresponding to the positions of the fan, and the air outlets are disposed on the neck frame and extend or are spaced apart along the length direction of the neck frame; and a grille assembly disposed within the air duct and near the air outlet side of the fan, wherein the grille assembly includes a first grille and a second grille coaxially arranged, the first grille having a plurality of first guide vanes, and the second grille having a plurality of second guide vanes, the first guide vanes and the second guide vanes being staggered along the axial direction.

[0006] The above configuration allows the first guide vane of the first grille to cut the airflow from the fan for the first time when the fan is drawing in air, thereby increasing the airflow speed. Then, the second guide vane of the second grille cuts the airflow a second time, further increasing the airflow speed. This makes the airflow generated by the fan of the same power more concentrated. At the same time, the guide vane optimizes the direction of airflow, reduces airflow turbulence and eddies, thereby reducing the noise of the fan to a certain extent.

[0007] Preferably, the first grille is closer to the fan than the second grille, the number of the first guide vanes is less than the number of the second guide vanes, and the spacing between two adjacent first guide vanes is greater than the spacing between two adjacent second guide vanes.

[0008] The first guide vane cuts the airflow for the first time, so the spacing is larger for initial guidance. Then the second guide vane cuts the airflow direction a second time, so the spacing is smaller for further guidance.

[0009] Preferably, the first guide vane extends in a straight line and is inclined in the axial direction; the second guide vane extends in an arc and is parallel to the axial direction.

[0010] The first guide vane extends in a straight line and is inclined along the axial direction to initially guide the airflow and regulate its direction. Then, the second guide vane extends in an arc and is parallel to the axial direction to further regulate the airflow, allowing it to flow more effectively along the duct. The axial direction refers to the axial direction of the fan and the grille assembly.

[0011] Preferably, the air duct includes a guide section with a grille assembly and an air outlet section connected to the air outlet, wherein the wall of the air duct contracts inward at the connection between the guide section and the air outlet section.

[0012] The wall of the air duct at the connection between the guide section and the outlet section contracts inward, which has the effect of concentrating the air and increasing the wind speed, thus resulting in a larger wind speed at the outlet.

[0013] Preferably, the second grille is located near the connection between the guide section and the air outlet section, and a hemisphere extending from the connection between the guide section and the air outlet section is provided at the center of the second grille.

[0014] By setting up a hemisphere, which occupies the space through which wind energy passes, the passage for wind is narrowed, thereby further increasing wind speed.

[0015] Preferably, the neck brace includes two front frames and a rear frame connected between the two front frames; the air duct includes a first air duct disposed in the front frame and a second air duct disposed in the rear frame; the internal aperture of the first air duct gradually decreases from the grid assembly side to the rear frame side.

[0016] The first air duct is connected to an air outlet. As the air is lost, the airflow becomes weaker the further away from the fan. Therefore, the aperture of the first air duct is narrowed to increase the airflow and maintain the airflow speed.

[0017] Preferably, the rear frame is hollow inside, and the interior of the rear frame is provided with a first partition extending along its length. The first partition divides the internal cavity of the rear frame into a large cavity and a small cavity. The area of ​​the circumferential inner edge cross-section of the small cavity is smaller than the area of ​​the circumferential inner edge cross-section of the large cavity. The small cavity constitutes the second air duct, and the air outlet of the first air duct is aligned with the opening of the second air duct.

[0018] To save materials and prevent plastic materials from deforming after injection molding, the plastic material is usually designed to be hollow, that is, the rear frame is hollow. In order to enhance the air velocity at the air outlet, the interior of the rear frame is divided into a large cavity and a small cavity by a partition. The large cavity does not produce air, while the small cavity produces air. The small cavity has a smaller circumferential inner edge cross-sectional area, so it can make the air velocity faster.

[0019] Preferably, the air outlet includes a first air outlet corresponding to the first air duct and a second air outlet corresponding to the second air duct; the wall of the first air duct corresponding to the first air outlet is provided with an air outlet groove extending along its length direction, and the air outlet groove is provided with a plurality of evenly spaced second partitions to divide the air outlet groove into a plurality of interval grooves, and the first air outlets are evenly spaced along the length direction of the neck brace and the number of first air outlets is greater than the number of interval grooves.

[0020] By setting the air outlet duct as a spaced duct and having a large number of first air outlets, excessive air loss from the first air duct is prevented, which would cause the airflow in the second air duct to become significantly weaker.

[0021] Preferably, the second air duct is connected to the first air ducts on both sides, and a third partition is provided in the middle of the second air duct to divide the second air duct into two parts.

[0022] The third partition isolates the air blown out by the first air ducts on both sides, thereby preventing the air blown out by the first air ducts on both sides from interfering with each other.

[0023] Preferably, the fan's rotation axis points towards the front end of the neck brace, and the front end of the neck brace is provided with the air inlet.

[0024] The fan's axis of rotation points to the front end of the neck brace, and the air inlet is located at the front end rather than the side end, which can prevent clothing or hair from blocking the air inlet to a certain extent.

[0025] Compared with the prior art, this utility model optimizes the airflow direction by designing the grille assembly, the shape of the first air outlet section, and the shape of the guide section, thereby reducing noise and increasing wind speed. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the utility model;

[0027] Figure 2 for Figure 1 A sectional view;

[0028] Figure 3 for Figure 1 Exploded view;

[0029] Figure 4 A schematic diagram of the front frame after removing the outer shell.

[0030] Figure 5 This is a schematic diagram of the first air duct structure;

[0031] Figure 6 This is a schematic diagram of the first air duct structure;

[0032] Figure 7 This is a cross-sectional view of the first air duct;

[0033] Figure 8 This is a schematic diagram of the structure at the opening of the second air duct;

[0034] Figure 9 This is an exploded view of the grille assembly;

[0035] Figure 10 This is a top view of the grille assembly.

[0036] Reference numerals: 1. Front frame; 11. Dustproof net; 12. Battery; 13. Connector; 2. Rear frame; 21. First air outlet; 22. Second air outlet; 3. Fan; 4. Grille assembly; 41. First grille; 42. Second grille; 43. Hemisphere; 51. First air duct; 511. Guide section; 512. Air outlet section of the first air duct; 52. Second air duct; 521. Third partition; 6. Air outlet slot; 61. Second partition; 62. Spacing slot; 71. Large cavity; 72. Small cavity; 73. First partition. Detailed Implementation

[0037] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1As shown, this embodiment discloses a neckband fan, including a neck frame. The neck frame is arc-shaped to fit the user's neck. The neck frame includes two front frames 1 spaced apart from each other, extending in a front-to-back direction. A rear frame 2 connects the two front frames 1, and the rear frame 2 is arc-shaped overall. When worn, the front frames 1 are located on the left and right sides of the user's neck, and the rear frame 2 is located on the back of the user's neck. In this embodiment, no hinge structure is used between the rear frame 2 and the front frames 1. The rear frame 2 is made of flexible plastic material with a certain degree of elastic deformation performance, allowing the user to widen the opening between the two front frames 1 when wearing the fan, thereby achieving the desired wearing fit.

[0039] like Figures 1 to 4 As shown, air outlets are provided on the walls of both the front frame 1 and the rear frame 2, arranged along their respective length directions and evenly spaced. The air outlets include a first air outlet 21 on the front frame 1 and a second air outlet 22 on the rear frame 2. An air inlet is provided at the front end of the front frame 1, and the air inlet is equipped with a dustproof mesh 11. The air ducts include a first air duct 51 located within the front frame 1 and a second air duct 52 located within the rear frame 2.

[0040] like Figure 2 , Figure 7 , Figure 9 and Figure 10 As shown, a fan 3 and a grille assembly 4 are provided in the first air duct 51. The air inlet and outlet direction of the fan 3 is along the length direction of the front frame 1, and the rotation axis of the fan 3 points to the front end of the front frame 1. The grille assembly 4 is located on the axial outlet side of the fan 3. The grille assembly 4 includes a first grille 41 and a second grille 42 in sequence along the axial direction. The first grille 41 and the second grille 42 are arranged adjacent to each other along the axial direction. The first grille 41 has several annularly spaced first guide vanes, and the second grille 42 has several annularly spaced second guide vanes. The first guide vanes and the second guide vanes are staggered along the axial direction. The first grille 41 is closer to the fan 3 than the second grille 42. The number of first guide vanes is less than the number of second guide vanes. The distance between two adjacent first guide vanes is greater than the distance between two adjacent second guide vanes. The first guide vanes and the second guide vanes are staggered along the axial direction. The extension direction of the first guide vanes of the first grille 41 is straight, and the first guide vanes are inclined along the axial direction. The extension direction of the second guide vanes of the second grille 42 is arc-shaped, and the second guide vanes are parallel to the axial direction. A hemispherical 43 extending from the connection point between the guide section 511 and the outlet section 511 of the first air duct is provided at the center of the second grille 42.

[0041] like Figures 3 to 7As shown, the entire air duct includes a guide section 511 and an outlet section. The guide section 511 is located on the first air duct 51, and the outlet section is partially located on the first air duct 51, with the remaining portion forming the second air duct 52. The wall of the first air duct 51 is recessed at the connection between the outlet section 512 and the guide section 511, reducing the aperture through which air can pass. The internal aperture of the first air duct 51 gradually decreases from the side of the grille assembly 4 to the side of the rear frame 2. The front frame 1 housing houses the battery 12 and a circuit board (not shown in the figure), and the reduced aperture of the first air duct 51 just makes way for the battery 12 and the circuit board.

[0042] The first air duct 51 has an air outlet groove 6 extending along its length on the wall corresponding to the first air outlet 21. The air outlet groove 6 has two evenly spaced second partitions 61 to divide the air outlet groove 6 into three partition grooves 62. The number of first air outlets 21 is greater than the number of partition grooves 62.

[0043] like Figures 2 to 4 as well as Figure 8 The front frame 1 and the rear frame 2 are connected by a connector 13, which has screw holes. The front frame 1 and the rear frame 2 are fitted onto both ends of the connector 13 and fixed with screws. The rear frame 2 is hollow inside, and a first partition 73 extending along its length is provided inside the rear frame 2. The first partition 73 divides the internal cavity of the rear frame into a large cavity 71 and a small cavity 72. The area of ​​the inner circumferential cross-section of the small cavity 72 is smaller than that of the inner circumferential cross-section of the large cavity 71. The small cavity 72 forms a second air duct 52, and the air outlet of the first air duct 51 is aligned with the opening of the second air duct 52. A third partition 521 is provided in the middle of the second air duct 52, dividing the second air duct 52 into two parts.

[0044] In use, the airflow is optimized and guided by the grille assembly 4, and the airflow is concentrated by the narrowing of the aperture of the first air duct 51. At the same time, the area of ​​the inner circumferential cross section of the second air duct 52 is relatively small, thereby achieving faster wind speed and reduced noise.

Claims

1. A neck-hanging fan, characterized in that, include: Neck brace; Fans are located on the inner sides of both ends of the neck brace; An air duct, disposed within a neck brace, contains a fan disposed within the air duct. Several air inlets and several air outlets are connected to both ends of the air duct. Air inlets are located at the ends of the neck brace corresponding to the fan positions, and air outlets are located on the neck brace and extend along the length of the neck brace or are spaced apart. A grille assembly is disposed in the air duct and near the air outlet side of the fan. The grille assembly includes a first grille and a second grille arranged coaxially. The first grille is provided with a plurality of first guide vanes, and the second grille is provided with a plurality of second guide vanes. The first guide vanes and the second guide vanes are staggered along the axial direction.

2. The neck-hanging fan according to claim 1, characterized in that: The first grille is closer to the fan than the second grille, the number of the first guide vanes is less than the number of the second guide vanes, and the spacing between two adjacent first guide vanes is greater than the spacing between two adjacent second guide vanes.

3. The neck-hanging fan according to claim 2, characterized in that: The first guide vane extends in a straight line and is inclined in the axial direction; the second guide vane extends in an arc and is parallel to the axial direction.

4. The neck-hanging fan according to claim 1, characterized in that: The air duct includes a guide section with a grille assembly and an air outlet section connected to the air outlet. The wall of the air duct contracts inward at the connection between the guide section and the air outlet section.

5. The neck-hanging fan according to claim 4, characterized in that: The second grille is located near the connection between the guide section and the air outlet section, and a hemisphere extending from the connection between the guide section and the air outlet section is provided at the center of the second grille.

6. The neck-hanging fan according to claim 1, characterized in that: The neck brace includes two front frames and a rear frame connected between the two front frames; the air duct includes a first air duct disposed in the front frame and a second air duct disposed in the rear frame; the internal aperture of the first air duct gradually decreases from the grid assembly side to the rear frame side.

7. The neck-hanging fan according to claim 6, characterized in that: The rear frame is hollow inside, and a first partition extending along its length is provided inside the rear frame. The first partition divides the internal cavity of the rear frame into a large cavity and a small cavity. The area of ​​the inner circumferential cross-section of the small cavity is smaller than the area of ​​the inner circumferential cross-section of the large cavity. The small cavity constitutes the second air duct, and the air outlet of the first air duct is aligned with the opening of the second air duct.

8. The neck-hanging fan according to claim 6, characterized in that: The air outlet includes a first air outlet corresponding to the first air duct and a second air outlet corresponding to the second air duct; the wall of the first air duct corresponding to the first air outlet is provided with an air outlet groove extending along its length direction, and the air outlet groove is provided with a plurality of evenly spaced second partitions to divide the air outlet groove into a plurality of interval grooves, and the first air outlets are evenly spaced along the length direction of the neck brace and the number of first air outlets is greater than the number of interval grooves.

9. The neck-hanging fan according to claim 6, characterized in that: The second air duct is connected to the first air ducts on both sides, and a third partition is provided in the middle of the second air duct to divide the second air duct into two parts.

10. The neck-hanging fan according to any one of claims 1 to 9, characterized in that: The fan's rotation axis points towards the front end of the neck brace, and the front end of the neck brace is provided with the air inlet.

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