Fan

Abstract

The utility model discloses a fan which comprises a front cover and a rear cover, and the front cover and the rear cover are combined in a covering mode to form a containing cavity. Fan blades are arranged in the accommodating cavity, and each fan blade comprises a hub and a plurality of blades arranged in the circumferential direction of the hub; the front cover comprises a cover plate, a plurality of air outlet grids and a side plate, the side plate is arranged on the periphery of the cover plate in a surrounding mode, the cover plate and the side plate are arranged at intervals, the air outlet grids are located between the cover plate and the side plate and connected with the cover plate and the side plate, and the air outlet grids are arranged at intervals and form an air outlet; the cover plate is located at the front end of the air outlet direction of the fan blades and shields the hub, the edge of the cover plate extends in the radial direction of the hub and at least partially shields the blades, and an air guide structure for guiding airflow to the air outlet is arranged on the surface of the side, facing the fan blades, of the cover plate.

Description

Technical Field

[0001] This utility model relates to the field of home appliances, and in particular to a fan. Background Technology

[0002] Fans are commonly used air-conditioning products in daily life. As people's quality of life improves, in addition to simply providing ventilation, they also increasingly demand higher visual appeal from fans. Therefore, "bladeless" fans have appeared on the market, which conceal the internal blades that generate airflow to enhance the visual effect. However, the concealed blades also reduce the amount of airflow generated, resulting in poor airflow performance. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a fan that can both block the fan blades and ensure normal airflow.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A fan includes a front cover and a rear cover, the front cover and the rear cover being closed together to form a receiving cavity; the receiving cavity is provided with fan blades, the fan blades including a hub and a plurality of blades arranged circumferentially along the hub; the front cover includes a cover plate, a plurality of air outlet grilles and a side plate, the side plate surrounding the periphery of the cover plate and the cover plate and the side plate being spaced apart, the plurality of air outlet grilles being located between the cover plate and the side plate and connecting the cover plate and the side plate, the plurality of air outlet grilles being spaced apart and forming air outlets; the cover plate is located at the front end of the fan blades in the air outlet direction and covers the hub, the edge of the cover plate extends radially toward the hub and at least partially covers the blades, and the surface of the cover plate facing the fan blades is provided with an air guide structure to direct airflow to the air outlets.

[0006] Furthermore, the cover plate has a circular outline in the air outlet direction of the fan blade, and the diameter of the cover plate is 0.7-0.9 times the maximum diameter of the fan blade.

[0007] Furthermore, the cover plate is coaxially arranged with the fan blade.

[0008] Furthermore, the surface of the cover plate facing the fan blade is at least partially configured to gradually move away from the fan blade along the direction from the center of the cover plate to the edge of the cover plate outline, thereby forming the air guiding structure.

[0009] Furthermore, the air guiding structure is an inclined surface disposed on the surface of the cover plate facing the fan blade; or, the air guiding structure is an arc-shaped surface disposed on the surface of the cover plate facing the fan blade.

[0010] Furthermore, the maximum distance between the hub and the air guide structure along the axial direction on the side of the hub closest to the air guide structure is 0.1-0.3 times the diameter of the fan blade.

[0011] Furthermore, the diameter of the hub is 0.4-0.5 times the diameter of the fan blade.

[0012] Furthermore, a fixing groove is recessed in the middle of the surface of the cover plate facing the fan blade. A motor for driving the fan blade is provided in the fixing groove. The motor is at least partially located in the fixing groove, and the air guide structure surrounds the fixing groove.

[0013] Furthermore, the maximum diameter of the fixing groove is less than or equal to the diameter of the wheel hub, or the difference between the maximum diameter of the fixing groove and the diameter of the wheel hub does not exceed 3mm.

[0014] Furthermore, the minimum distance between the air outlet grid and the fan blade along the axial direction of the fan blade is 0.05-0.2 times the diameter of the fan blade.

[0015] Furthermore, the maximum dimension of the air outlet grid along the axial direction of the fan blade is 0.03-0.2 times the diameter of the fan blade.

[0016] Furthermore, the gap width between the cover plate and the side plate is 0.05-0.2 times the diameter of the fan blade.

[0017] Furthermore, the side of the air outlet grille closest to the accommodating cavity is the windward side, and the side furthest from the accommodating cavity is the air outlet side, with the thickness gradually increasing from the windward side to the air outlet side.

[0018] Furthermore, the thickness of the windward side does not exceed 3mm.

[0019] Furthermore, the inner diameter of the side plate gradually decreases in the direction away from the accommodating cavity.

[0020] Furthermore, the fan also includes a frame, at least one of the front cover and the rear cover is disposed on the frame, and the center position of the front cover and the rear cover is located at three-fifths or less of the height of the frame.

[0021] Furthermore, the frame is provided with at least one support pad, which is located at the bottom of the frame to tilt the frame towards the front of the fan blade's air outlet direction.

[0022] Furthermore, a charging port is provided on the side surface of the side plate away from the accommodating cavity, and the opening of the charging port faces the bottom of the frame.

[0023] Furthermore, a display screen is provided on the side of the cover plate away from the receiving cavity, and the diameter of the display screen is smaller than the diameter of the cover plate.

[0024] The beneficial effects of this utility model are as follows: The fan cover of this utility model is located at the front end of the fan blades in the airflow direction, that is, in the airflow direction of the fan blades, blocking the hub. The edge of the cover also extends radially towards the hub, and at least partially blocks the blades. Therefore, from the outside of the fan's front cover, the hub is blocked by the cover, part of the fan blades is blocked by the cover, and the high-speed rotation of the blades exceeds the reaction speed of the human eye, so the user cannot see its specific movement clearly, only a blurry image, which allows people to visually ignore the existence of the fan blades as much as possible. In order to maintain the airflow effect while blocking the fan blades, an air guide structure is provided on the surface of the cover facing the fan blades, which can guide the airflow generated by the fan blades into the air outlet around the cover, ensuring that the fan can output air normally. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is an assembly diagram of the present invention;

[0027] Figure 2 This is an exploded schematic diagram of this utility model;

[0028] Figure 3 This is a front view of the present invention;

[0029] Figure 4 yes Figure 3 A cross-sectional schematic diagram of AA in the middle;

[0030] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0031] Figure 6 This is a schematic diagram of the front cover structure in this utility model. Figure 1 ;

[0032] Figure 7 This is a schematic diagram of the front cover structure in this utility model. Figure 2 .

[0033] Explanation of reference numerals in the attached drawings: 100-Fan; 1-Front cover; 11-Cover plate; 111-Air guide structure; 112-Fixing slot; 113-Fixing pipe; 114-Mounting slot; 12-Side plate; 121-Charging port; 13-Air outlet grille; 2-Rear cover; 3-Fan blade; 31-Hub; 32-Blade; 4-Accommodation cavity; 5-Display screen; 6-Frame. Detailed Implementation

[0034] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0035] Please refer to Figures 1 to 7 As shown, this utility model provides an air outlet device, which includes a fan blade 3, a front cover 1 disposed on the air outlet side of the fan blade 3, and a rear cover 2 disposed on the air inlet side of the fan blade 3. The front cover 1 and the rear cover 2 are assembled to form a receiving cavity 4, and the fan blade 3 is disposed in the receiving cavity 4.

[0036] The front cover 1 includes a cover plate 11, a side plate 12 surrounding the cover plate 11, and a plurality of air outlet grilles 13 disposed between the cover plate 11 and the side plate 12. The air outlet is located between the cover plate 11 and the side plate 12. The airflow generated by the rotation of the fan blade 3 is blown out from the air outlet. The plurality of air outlet grilles 13 are arranged at intervals on the air outlet and connected to the cover plate 11 and the side plate 12.

[0037] Furthermore, the fan blade 3 includes a hub 31 and blades 32. Multiple blades 32 are provided and arranged circumferentially along the hub 31. The rotating shaft and the fixing groove 112 are both provided on the hub 31. By fixing the hub 31 to the motor and rotating it, the blades 32 are used to rotate and generate airflow, thereby blowing out wind.

[0038] The cover plate 11 is located at the front end of the fan blade 3 in the direction of airflow, thus obscuring the hub 31. The edge of the cover plate 11 extends radially towards the hub 31 and at least partially obscures the blades 32. Therefore, from the outside of the front cover 1 of the fan 100, the hub 31 is obscured by the cover plate 11, part of the fan blades 3 is obscured by the cover plate 11, and the high-speed rotation of the blades 32 exceeds the reaction speed of the human eye. The user cannot see its specific movement clearly and can only see a blurry image, which allows people to visually ignore the existence of the fan blades 3 as much as possible.

[0039] The fan blade 3 has a circular outline when rotating. To better conceal the fan blade 3, the cover plate 11 also has a circular outline in the air outlet direction of the fan blade 3 and is coaxially arranged with the hub 31 to ensure the concealment effect. Preferably, the diameter of the cover plate 11 is 0.7-0.9 times the maximum diameter of the fan blade 3, which can ensure that the fan blade 3 is concealed over the largest possible area, making it as invisible as possible; however, some space is reserved so that the air from the fan blade 3 can be blown out from the air outlet on the side of the cover plate 11, avoiding excessive loss of air volume.

[0040] In order to maintain the airflow effect while blocking the fan blade 3, an air guide structure 111 is provided on the side of the cover plate 11 facing the fan blade 3, which can guide the airflow generated by the fan blade 3 into the air outlet around the cover plate 11.

[0041] The surface of the cover plate 11 facing the fan blade 3 is at least partially configured to gradually move away from the fan blade 3 along the direction from the center of the cover plate 11 to the edge of the cover plate 11 outline, thereby forming an air guide structure 111. Specifically, the side of the cover plate 11 facing the receiving cavity 4 is the inner side, which gradually moves from the center of the inner side towards the fan blade 3 from the edge near the air outlet grid 13. That is, the distance between the blade 32 and the air guide structure 111 is greater than the distance between the air guide structure 111 of the hub 31. Therefore, the inner side forms an inclined surface, which forms the air guide structure 111.

[0042] The air guiding structure 111 can be a straight inclined surface on the surface of the cover plate 11 facing the fan blade 3, or the air guiding structure 111 can be an arc-shaped surface on the surface of the cover plate 11 facing the fan blade 3. Specifically, the air guiding structure 111 forms an arc-shaped surface along different inclination angles.

[0043] To ensure sufficient airflow between the fan blade 3 and the air guide structure 111, and to avoid cavity noise caused by excessive distance, the distance between the air guide structure 111 and the fan blade 3 is 0.1-0.3 times the diameter of the fan blade 3. Specifically, the starting point is the side of the fan blade 3 closest to the front cover when it rotates, which is the edge of the air guide structure 111. The maximum distance between the fan blade 3 and the air guide structure 111 is calculated axially (refer to...). Figure 5 D1 in the figure is 0.1-0.3 times the diameter of the fan blade 3. Generally speaking, the very end of the fan blade 3 is the side of the hub 31 closest to the air guide structure 111. The hub 31 is a columnar structure, and there is a plane on the side of it closest to the air guide structure 111. The distance from the air guide surface is calculated in the axial direction starting from this plane.

[0044] The air guide structure 111 ensures that the airflow generated by the fan blades 3 is directed to the air outlet, preventing the airflow from directly impacting a flat surface and causing it to backflow internally and fail to be blown out. To achieve better airflow performance, the air volume must be large enough, thus requiring a sufficient area for the fan blades 3. In this design, the diameter of the hub 31 is 0.4-0.5 times the diameter of the fan blades 3. Therefore, from an axial perspective, this ensures that the radial distance of the fan blades 3 outside the hub 31 is sufficiently long, guaranteeing the generation of sufficient airflow.

[0045] The cover plate 11 has a peripheral side that connects to the air outlet grille 13. This peripheral side is axially connected to the side furthest from the receiving cavity 4. The air outlet grille 13 is disposed on the peripheral side and the side plate 12. The gap between the cover plate 11 and the side plate 12 forms the air outlet, and the width of this gap determines the size of the air outlet (see reference). Figure 5 The width of D3 (in the fan blade 3) is typically between 0.05 and 0.2 times the diameter of the fan blade 3. This ensures sufficient airflow space to avoid efficiency reduction due to restricted airflow. It also prevents the outlet from being too large, causing uneven airflow distribution, or too small, affecting airflow transmission. The inner diameter of the side plate 12 gradually decreases towards the direction away from the receiving cavity 4. Therefore, from the axial direction along the airflow direction, the outlet gradually becomes smaller, pressurizing the airflow and allowing it to travel further.

[0046] An air outlet grille 13 is positioned at the air outlet, and both side walls of the grille 13 are straight in the axial direction. This is to guide the scattered airflow from the fan blades 3 into a straight direction, allowing it to be blown directly onto the human body along one axial direction. Preferably, the maximum dimension of the air outlet grille 13 along the axial direction of the fan blades 3 is 0.03-0.2 times the diameter of the fan blades 3, specifically referring to the longest side distance of the air outlet grille 13 in the axial direction (refer to...). Figure 5 The D2 value is typically set between 0.03 and 0.2 times the diameter of the fan blade 3. This ensures effective airflow while preventing the grid size from being too large, causing poor airflow, or too small, preventing the airflow direction from being changed.

[0047] Furthermore, the minimum distance between the air outlet grille 13 and the fan blade 3 along the axial direction of the fan blade 3 refers to the gap between the grille surface and the closest part of the fan blade 3, which is between 0.05 and 0.2 times the diameter of the fan blade 3. This ensures smooth airflow while avoiding excessive contact between the fan blade 3 and the air outlet grille 13, thereby reducing unnecessary friction and noise.

[0048] The side of the air outlet grille 13 closest to the receiving cavity 4 is the windward side, and the side furthest from the receiving cavity 4 is the outlet side. Following the direction of airflow, the thickness of the grille gradually increases from the windward side to the outlet side. This contributes to the stability and efficiency of airflow; by gradually increasing the thickness, changes in airflow velocity are mitigated, the outlet gradually becomes smaller, and the airflow is pressurized, thus allowing the airflow to travel further. The thickness on the windward side does not exceed 3mm. This avoids airflow instability caused by excessive thickness and helps maintain good ventilation.

[0049] The accommodating cavity 4 is divided into a front cavity and a rear cavity by the front cover 1 and the rear cover 2. The rear cavity and the front cavity together form the accommodating cavity 4. The fan blade 3 is located in the rear cavity, and the foremost end of the fan blade 3 is located on the boundary line between the front cavity and the rear cavity. The motor is located in the space of the front cavity. The motor can be fixed on the front cover 1 or the rear cover 2. In this solution, the motor is fixed on the front cover 1. In order to better fix the motor, the surface of the cover plate 11 facing the fan blade 3 is recessed in the middle of the cover plate 11 with a fixing groove 112. The fixing groove 112 is provided with a motor for driving the fan blade 3. The motor is at least partially located in the fixing groove 112. The air guide structure 111 surrounds the fixing groove 112.

[0050] The front cover 1 has a fixing tube 113 on the side facing the accommodating cavity 4. The fixing tube 113 is located at the central axis of the front cover 1 and is a tubular component, with the central part used to fix the rotating shaft of the fan blade 3. A motor is sleeved on the outside of the fixing tube 113. The motor is an external rotor motor, which includes a rotor and a stator. The stator is fixed outside the fixing tube 113, and the rotor is sleeved outside the stator, rotating relative to the stator. The external rotor motor allows for a more compact overall design of the fan 100, and the rotor of the external rotor motor is located outside the housing, allowing for freer airflow and aiding in motor heat dissipation.

[0051] When the motor is fixed to the front cover 1, in order to ensure that the air guide structure 111 can guide most of the airflow, the maximum diameter of the fixing groove 112 is less than or equal to the diameter of the hub 31, or the difference between the maximum diameter of the fixing groove 112 and the diameter of the hub 31 does not exceed 3mm, so that most of the airflow generated by the blades 32 can be discharged by the air guide structure 111.

[0052] The minimum distance between the air outlet grille 13 and the fan blade 3 along the axial direction of the fan blade 3 is 0.05-0.2 times the diameter of the fan blade 3. Since there is an assembly gap in the fan blade 3, if the air outlet grille 13 and the fan blade 3 are too close, they will directly hit the air outlet grille 13 and cause noise. If the distance is too far, it will generate cavity noise.

[0053] Furthermore, the fan blade 3 is equipped with a rotating shaft that mates with the fixed tube 113. The rotating shaft is inserted into the fixed tube 113, and a bearing is fitted over the rotating shaft to allow it to rotate relative to the fixed tube 113. A fixing groove 112 for placing the stator is provided on the air outlet side of the fan blade 3, and the fixing groove 112 is located in the middle, with the rotating shaft fixed in the middle of the fixing groove 112. The rotor is fixedly installed in the rotating groove. When the rotating shaft is inserted into the fixed tube 113, the rotor will be fitted onto the stator. When the rotor rotates relative to the stator, it will drive the fan blade 3 to rotate, and the rotating shaft of the fan blade 3 will also rotate within the fixed tube 113.

[0054] Among them, a mounting groove 114 for mounting the battery and circuit board is provided on the side of the cover plate 11 away from the accommodating cavity 4. The mounting groove 114 is recessed towards the accommodating cavity 4 in the axial direction, and in the axial direction, the mounting groove 114 is within the range of the side plate 12, so as to prevent the mounting groove 114 and the components inside it from protruding outside the front cover 1.

[0055] A battery mounting position is provided in the middle of the mounting slot 114 for placing the battery. The battery is electrically connected to the motor to supply power to the motor. A circuit board is installed below the battery mounting position and is electrically connected to the motor and battery. The circuit board can control the motor switch and is equipped with a charging connector to charge the battery.

[0056] Preferably, a display screen 5 is provided on the side of the cover plate 11 away from the receiving cavity 4, which can display information such as battery power and the usage status of the fan 100. The diameter of the display screen 5 is larger than the diameter of the mounting groove 114 and smaller than the diameter of the cover plate 11. The display screen 5 is in front of the cover plate 11 and can hide the battery fixing position and the motor, keeping the product aesthetically pleasing.

[0057] Furthermore, a charging port 121 is provided on the front cover, extending through the side panel 12. The charging connector of the circuit board is located inside the charging port 121 for easy connection to external circuitry. Dividing the front cover into upper and lower sections based on the direction of gravity, the charging port 121 is located in the lower half of the front cover and faces downwards. Preferably, the charging port 121 is located at the bottom or center of the front cover. When external wires are connected, their weight is concentrated at the bottom of the casing, preventing pulling on the upper parts and affecting the overall weight of the device. Furthermore, being in the center also avoids the appearance of displacement or other undesirable effects caused by weight fluctuations in other locations.

[0058] The fan 100 also includes a frame 6 for supporting the entire fan 100, wherein at least one of the front cover 1 and the rear cover 2 is mounted on the frame 6. The frame 6 surrounds the entire fan 100, and the center of the front cover 1 and the rear cover 2 is located at three-fifths of the height of the frame 6 and below. Both the front cover 1 and the rear cover 2 are circular to ensure that the center of gravity of the fan 100 is not too high and to prevent it from tipping over.

[0059] Furthermore, at least one support pad is provided on the frame 6, which is located at the bottom of the frame 6 to tilt the frame 6 towards the front of the fan blade 3 in the direction of airflow. When the fan 100 blows air, it exerts a backward force on the entire fan 100. The forward tilt of the frame 6 counteracts the force of the wind, thereby maintaining overall balance.

[0060] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A fan, characterized by, The fan comprises a front cover and a rear cover, the front cover and the rear cover are combined to form a containing cavity, a fan blade is arranged in the containing cavity, the fan blade comprises a hub and a plurality of blades arranged circumferentially around the hub, the front cover comprises a cover plate, a plurality of air outlet grids and a side plate, the side plate is arranged around the periphery of the cover plate, the cover plate and the side plate are arranged in a spaced manner, the plurality of air outlet grids are arranged between the cover plate and the side plate and connect the cover plate and the side plate, and the plurality of air outlet grids are arranged in a spaced manner and form air outlets. The cover plate is located at the front end of the fan blade in the air outlet direction and covers the hub, the edge of the cover plate extends in the radial direction of the hub and at least partially covers the blades, and the surface of the cover plate towards the fan blade is provided with a wind guide structure for guiding air flow to the air outlets.

2. The fan of claim 1, wherein, The outline of the cover plate in the air outlet direction of the fan blade is circular, and the diameter of the cover plate is 0.7-0.9 times the maximum diameter of the fan blade.

3. The fan of claim 2, wherein, The cover plate is coaxially arranged with the fan blade.

4. The fan of claim 1, wherein, The surface of the cover plate towards the fan blade is at least partially configured to gradually move away from the fan blade from the center of the cover plate to the edge of the outline of the cover plate, thereby forming the wind guide structure.

5. The fan of claim 4, wherein, The wind guide structure is an inclined surface arranged on the surface of the cover plate towards the fan blade, or the wind guide structure is an arc-shaped surface arranged on the surface of the cover plate towards the fan blade.

6. The fan of claim 1, wherein, The maximum distance between the side of the hub close to the wind guide structure and the wind guide structure in the axial direction is 0.1-0.3 times the diameter of the fan blade.

7. The fan of claim 1, wherein, The diameter of the hub is 0.4-0.5 times the diameter of the fan blade.

8. The fan of claim 1, wherein, The surface of the cover plate towards the fan blade is concave in the middle of the cover plate and is provided with a fixing groove, a motor for driving the fan blade is arranged in the fixing groove, the motor is at least partially located in the fixing groove, and the wind guide structure is arranged around the side of the fixing groove.

9. The fan of claim 8, wherein, The maximum diameter of the fixing groove is less than or equal to the diameter of the hub, or the difference between the maximum diameter of the fixing groove and the diameter of the hub is not more than 3 mm.

10. The fan of claim 1, wherein, The minimum distance between the air outlet grid and the fan blade in the axial direction of the fan blade is 0.05-0.2 times the diameter of the fan blade.

11. The fan of claim 1, wherein, The maximum size of the air outlet grid in the axial direction of the fan blade is 0.03-0.2 times the diameter of the fan blade.

12. The fan of claim 1, wherein, The gap width between the cover plate and the side plate is 0.05-0.2 times the diameter of the fan blade.

13. The fan of claim 1, wherein, The side close to the containing cavity of the air outlet grid is the windward side, and the side away from the containing cavity is the air outlet side, and the thickness gradually increases from the windward side to the air outlet side.

14. The fan of claim 13, wherein, The thickness of the windward side is not more than 3 mm.

15. The fan of claim 1, wherein, The inner diameter of the side plate gradually decreases away from the containing cavity.

16. The fan of any one of claims 1-15, wherein, The fan further comprises a frame, at least one of the front cover and the rear cover is arranged on the frame, and the center positions of the front cover and the rear cover are located at the position of three-fifths or below of the height position of the frame.

17. The fan of claim 16, wherein, The frame is provided with at least one support pad, and the support pad is arranged at the bottom of the frame to incline the frame towards the front side in the air outlet direction of the fan blade.

18. The fan of claim 16, wherein, The side plate is provided with a charging port away from the side surface of the accommodating cavity, and the opening of the charging port faces the bottom of the frame body.

19. The fan of any one of claims 1-15, wherein, The side away from the accommodating cavity of the cover plate is also provided with a display screen, and the diameter of the display screen is smaller than the diameter of the cover plate.

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