Silent ventilating fan

Abstract

The utility model relates to a kind of mute ventilation fan, including outer cover, fan blade, motor and base, base includes shell and pedestal, the one end of pedestal corresponding outer cover is front end, pedestal is set in shell rear end, pedestal is provided with the accommodating cavity of front end opening, motor is set in accommodating cavity and is detachably connected with pedestal by connecting piece, motor includes the driving shaft connected with fan blade, fan blade is set in the one end of pedestal corresponding outer cover, shell and pedestal are connected by multiple evenly arranged connecting parts, connecting part is obliquely set from front end to rear end, fan blade includes the hub connected with driving shaft and the blade that surrounds hub and is evenly arranged, blade is obliquely set towards the opposite direction of connecting part. By adopting the above technical scheme, improve suction efficiency, reduce air intake resistance and turbulence, so as to reduce noise;Blade is obliquely set towards the opposite direction of connecting part, reverse flow guide forces tangential velocity component ordered attenuation, can avoid vortex flow impact to form, effectively improve exhaust volume.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, and in particular relates to a silent ventilation fan. Background Technology

[0002] Exhaust fans are widely used in our daily lives, often in places like bathrooms, kitchens, laboratories, and darkrooms for ventilation. A typical exhaust fan consists of a casing, motor, fan blades, air outlet, and air inlet cover. It relies on the motor driving the fan blades to generate centrifugal force to achieve air extraction and ventilation. Because the airflow is large during operation, the vibration of the airflow generates significant noise, which, combined with the noise from the motor itself, has a considerable impact on environmental noise. Utility Model Content

[0003] In summary, to overcome the shortcomings of the prior art, this utility model provides a silent ventilation fan.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a silent ventilation fan, comprising an outer cover, fan blades, a motor, and a base. The base includes a housing and a pedestal, with one end of the pedestal corresponding to the outer cover as the front end. The pedestal is disposed within the rear end of the housing and has a receiving cavity with a front opening. The motor is disposed within the receiving cavity and detachably connected to the pedestal via a connector. The motor includes a drive shaft connected to the fan blades. The fan blades are disposed at one end of the pedestal corresponding to the outer cover. The housing and the pedestal are connected by a plurality of evenly arranged connecting parts, which are inclined from the front end to the rear end. The fan blades include a hub connected to the drive shaft and blades evenly arranged around the hub, with the blades inclined in the opposite direction to the connecting parts.

[0005] By adopting the above technical solution, the fan blades are set at the front end of the base, which improves the suction efficiency, optimizes the airflow entry path, reduces intake resistance and turbulence, thereby reducing noise and helping to maintain a compact structure and cost advantage. The blades are tilted in the opposite direction to the connecting part, so that the airflow has enough acceleration time in the blade channel. The connecting part is tilted in the opposite direction to the blades, and the reverse flow forces the tangential velocity component to decay in an orderly manner, which can avoid the formation of vortices by airflow impact and effectively improve the exhaust volume.

[0006] The present invention is further configured such that: the connecting part is inclined clockwise from the front end to the rear end, and the blade is inclined counterclockwise from the front end to the rear end, with the included angle between the two being α, where 103°≤α≤147°.

[0007] By adopting the above technical solution, an expanding obtuse-angle flow channel is formed, which forces the airflow to decelerate rapidly. Through the expansion channel cross-section and reverse guidance, the tangential kinetic energy of the airflow is efficiently converted into static pressure energy, providing smoother flow direction, reducing boundary layer separation, and resulting in higher stability and wider applicability. The obtuse-angle expanding flow channel provides a smooth pressure gradient, strengthens the wall-attached flow, and ensures that the airflow flows closely to the guide vanes, avoiding separation. Turbulence intensity is reduced by 40%, and airflow stability is improved. The connection part and the blade are tilted in opposite directions to avoid broadband noise generated by high-speed swirling flow impacting the outer shell. Reducing flow separation can suppress the mid-to-high frequency hissing sound caused by vortex shedding, suppress rotational noise, and reduce overall noise. The tilt angle between the two is α, 103°≤a≤147°, which provides a self-cleaning tendency. Contaminants are thrown to the outer wall by centrifugal force, extending the cleaning cycle.

[0008] The present invention is further provided that: the blade is twisted, and the middle part of the blade protrudes in a counterclockwise direction.

[0009] By adopting the above technical solution, the middle part of the blade protrudes counterclockwise, and the blade tilts counterclockwise from the front end to the rear end to form a local high angle of attack zone, which improves aerodynamic efficiency, reduces noise, and achieves anti-fouling, anti-vibration, anti-fatigue, high load, long service life, and low noise.

[0010] The present invention further comprises: the blade includes an inner end side connected to the hub and an outer end side opposite to it, the inner end side having an inclination angle b relative to the axis of the hub, 23°≤b≤45°, and the outer end side having an inclination angle c relative to the axis of the hub, 44°≤c≤46°.

[0011] By adopting the above technical solutions, the blade tilt angle determines the "angle of attack" of the air entering the blade. A suitable tilt angle allows the airflow to flow over the blade surface with minimal impact and maximum lift. Optimizing the angle can significantly reduce induced drag and surface drag, and improve aerodynamic efficiency. A suitable tilt angle can guide the airflow to flow more smoothly along the blade surface, reducing the strong turbulence generated by airflow stripping and vortices.

[0012] The present invention further comprises: the hub being cap-shaped, the hub including a ring wall and an arc apex connected to the front of the ring wall, the connection between the ring wall and the arc apex being an arc-shaped transition connection, and the inner end side being connected to the front of the ring wall and extending obliquely to the arc apex.

[0013] By adopting the above technical solution, when the airflow passes through the curved apex, the streamline generates a pressure gradient difference, forming aerodynamic lift, thereby more efficiently converting the rotational kinetic energy of the motor into kinetic and pressure energy of the airflow. The apex can significantly increase the airflow angle of attack range, reduce airflow separation, and drive a larger volume of air at the same speed. The smooth arc surface reduces airflow stripping and vortex breaking, and reduces aerodynamic noise.

[0014] The present invention further provides that the angle of inclination of the connecting part relative to the axis of the base is d, where 10°≤d≤31°.

[0015] By adopting the above technical solution, the small angle of inclination of the connection part means that its curvature is more gradual. It can guide the airflow direction from tangential to axial more gradually and gently, greatly reducing the impact intensity between the fluid and the surface of the guide plate, significantly reducing mid-to-high frequency turbulence noise, causing less disturbance to the airflow, and improving flow adaptability.

[0016] The present invention further comprises: a check valve at the rear end of the base, the check valve including a housing connected to the base, a channel inside the housing, the front end of the channel being an air inlet and the rear end being an air outlet, a first baffle and a second baffle adapted to and symmetrically arranged with respect to the air outlet being arranged near the air outlet inside the channel, a reset component for driving the first baffle and the second baffle to close at the air outlet position being arranged behind the first baffle and the second baffle, the housing having a base at the center of one end corresponding to the air inlet, and a plurality of guide plates evenly arranged around the base inside the housing, the guide plates being inclined from the front end to the rear end and in the same inclination direction as the connecting part.

[0017] By adopting the above technical solution, during exhaust, air enters from the air inlet. The first and second baffles are blown by the wind, and the sides of the baffles not connected to the housing rotate and open towards the exhaust outlet, allowing air to be discharged from the openings of the first and second baffles along the exhaust outlet direction. When exhaust is complete, the reset assembly resets the first and second baffles, allowing them to close at the exhaust outlet. A check valve is installed to prevent backflow, and the closed check valve forms a physical barrier, preventing insects and rodents from entering the room from the outside or public pipes through the exhaust outlet. The guide plate is inclined from the front end to the rear end. The placement and tilt of the connecting part are in the same direction, which has a very significant synergistic effect. The airflow can leave the connecting part of the base at a continuous and smooth angle, be rectified, and then smoothly enter the check valve guide plate. Finally, it is discharged outdoors through the valve, which greatly reduces static pressure loss. This allows the fan to discharge more air at the same power / speed, or to achieve the same airflow with a lower fan speed and lower power consumption, making it more energy-efficient. The smooth and continuous airflow reduces the impact of airflow excitation force on the valve plate and the entire system structure, greatly reducing the aerodynamic noise of the exhaust system during operation. At the same time, reducing vibration helps to extend the life of the fan, valve plate and connecting parts. The present invention further comprises: a receiving part is provided at one end of the outer shell corresponding to the outer cover; a receiving groove for accommodating the circuit board is provided in the receiving part; a through hole for inserting the fan blade is provided in the middle of the receiving part; the outer cover includes a covering part for covering the receiving groove; a wiring part connected to the outer shell is provided on one side of the base; the wiring part is provided with a wire groove with an open front end; a wiring channel is provided on the outer shell corresponding to the position of the wire groove; one end of the wiring channel is connected to the receiving groove, and the other end is connected to the wire groove.

[0018] By adopting the above technical solutions, the wires are restricted and organized, and the wires are prevented from getting tangled with the fan blades, thus providing protection; messy cables are prevented from disturbing the airflow in the duct, reducing airflow interference; the cable trays guide the cables away from the motor heat dissipation, ensuring unobstructed cooling airflow.

[0019] The present invention further includes: a wire groove cover is provided at the front end of the wiring part, the wire groove cover includes a first cover for covering the wire groove and a second cover for covering the wiring channel, the first cover and the second cover are arranged in an L-shape.

[0020] By adopting the above technical solutions, the cable tray cover further serves to restrict and protect the cable tray.

[0021] The present invention further comprises: a cover plate for blocking the through hole is provided at the front end of the outer cover; a slot is provided at the front end of the outer cover; a connecting post adapted to the slot is provided at the position of the cover plate corresponding to the slot; the cover plate is inserted into the slot and connected to the outer cover through the connecting post; and an air intake space communicating with the through hole is provided between the cover plate and the outer cover.

[0022] By adopting the above technical solution, the fan blades are not easily visible from the outside, making them more aesthetically pleasing. At the same time, the plug-in design facilitates quick assembly; it blocks most of the dust; and the detachable baffles make it easy to disassemble and replace, and facilitate cleaning and maintenance.

[0023] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples. Attached Figure Description

[0024] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0025] Figure 2 This is a partial cross-sectional view of an embodiment of the present utility model. Figure 1 .

[0026] Figure 3 This is a partial cross-sectional view of an embodiment of the present utility model. Figure 2 .

[0027] Figure 4 This is a partial cross-sectional perspective view of an embodiment of the present utility model.

[0028] Figure 5 This is a perspective view of the base according to an embodiment of the present utility model.

[0029] Figure 6 This is a side view of the fan blade according to an embodiment of the present utility model.

[0030] Reference numerals: 1. Outer cover, 11. Cover, 12. Slot, 2. Fan blade, 21. Hub, 211. Circumferential wall, 212. Arc apex, 22. Blade, 221. Inner end side, 222. Outer end side, 3. Motor, 31. Drive shaft, 4. Base, 41. Housing, 411. Wiring channel, 42. Base, 421. Receiving cavity, 43. Connecting part, 44. Receiving part, 441. Receiving 442. Through hole, 45. Wiring part, 451. Wire groove, 5. Check valve, 51. Housing, 511. Channel, 512. Air inlet, 513. Air outlet, 514. Base, 515. Guide plate, 52. First baffle, 53. Second baffle, 54. Reset assembly, 6. Wire groove cover, 61. First cover, 62. Second cover, 7. Cover plate, 71. Connecting column, 8. Air intake space. Detailed Implementation

[0031] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0032] See appendix Figure 1-6 This embodiment discloses a silent ventilation fan, including an outer cover 1, fan blades 2, a motor 3, and a base 4. The base 4 includes a housing 41 and a base 42. The end of the base 42 corresponding to the outer cover 1 is the front end. The base 42 is disposed inside the rear end of the housing 41. The base 42 is provided with a receiving cavity 421 with a front opening. The motor 3 is disposed in the receiving cavity 421 and is detachably connected to the base 42 through a connector. The motor 3 includes a drive shaft 31 connected to the fan blades 2. The fan blades 2 are disposed at the end of the base 42 corresponding to the outer cover 1. The housing 41 and the base 42 are connected by a plurality of evenly arranged connecting parts 43. The connecting parts 43 are inclined from the front end to the rear end. The fan blades 2 include a hub 21 connected to the drive shaft 31 and blades 22 evenly arranged around the hub 21. The blades 22 are inclined in the opposite direction to the connecting parts 43.

[0033] In this embodiment, the connecting part 43 is inclined clockwise from the front end to the rear end, and the blade 22 is inclined counterclockwise from the front end to the rear end, with an included angle of inclination α, where 103°≤α≤147°.

[0034] In this embodiment, the blade 22 is further configured to be twisted, and the middle part of the blade 22 protrudes in a counterclockwise direction.

[0035] This embodiment further specifies that the blade 22 includes an inner end side 221 connected to the hub 21 and an outer end side 222 disposed opposite to it. The angle of inclination of the inner end side 221 relative to the axis of the hub 21 is b, where 23°≤b≤45°, and the angle of inclination of the outer end side 222 relative to the axis of the hub 21 is c, where 44°≤c≤46°.

[0036] In this embodiment, the hub 21 is further configured as follows: the hub 21 is shaped like a cap, the hub 21 includes a ring wall 211 and an arc top 212 connected to the front of the ring wall 211, the connection between the ring wall 211 and the arc top 212 is an arc transition connection, and the inner end side 221 is connected to the front of the ring wall 211 and extends obliquely to the arc top 212.

[0037] In this embodiment, the angle of inclination of the connecting part 43 relative to the axis of the base 42 is d, where 10°≤d≤31°.

[0038] This embodiment further includes: a check valve 5 at the rear end of the base 4, the check valve 5 including a housing 51 connected to the base 4, a channel 511 inside the housing 51, the front end of the channel 511 being an air inlet 512 and the rear end being an air outlet 513, a first baffle 52 and a second baffle 53 adapted to and symmetrically arranged with the air outlet 513 near the position of the exhaust outlet 513 inside the channel 511, a reset component 54 for driving the first baffle 52 and the second baffle 53 to close at the position of the exhaust outlet 513 is provided behind the first baffle 52 and the second baffle 53, and a base 514 is provided at the center of one end of the housing 51 corresponding to the air inlet 512, and a plurality of guide plates 515 are evenly arranged around the base 514 inside the housing 51, the guide plates 515 are inclined from the front end to the rear end and are inclined in the same direction as the connecting part 43.

[0039] This embodiment further includes the following: a receiving portion 44 is provided at one end of the outer shell 41 corresponding to the outer cover 1; a receiving groove 441 for accommodating the circuit board is provided in the receiving portion 44; a through hole 442 for inserting the fan blade 2 is provided in the middle of the receiving portion 44; the outer cover 1 includes a covering portion 11 for covering the receiving groove 441; a wiring portion 45 connected to the outer shell 41 is provided on one side of the base 42; the wiring portion 45 is provided with a wire groove 451 with an open front end; a wiring channel 411 is provided on the outer shell 41 corresponding to the position of the wire groove 451; one end of the wiring channel 411 is connected to the receiving groove 441, and the other end is connected to the wire groove 451.

[0040] In this embodiment, the front end of the wiring part 45 is provided with a wire groove cover 6. The wire groove cover 6 includes a first cover 61 for covering the wire groove 451 and a second cover 62 for covering the wiring channel 411. The first cover 61 and the second cover 62 are arranged in an L-shape.

[0041] This embodiment further includes: a cover plate 7 for blocking the through hole 442 is provided at the front end of the outer cover 1, a slot 12 is provided at the front end of the outer cover 1, a connecting post 71 adapted to the slot 12 is provided at the position of the cover plate 7 corresponding to the slot 12, the cover plate 7 is inserted into the slot 12 and connected to the outer cover 1 through the connecting post 71, and an air intake space 8 communicating with the through hole 442 is provided between the cover plate 7 and the outer cover 1.

[0042] In the description of this utility model, it should be noted that the terms "center", "front", "rear", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. The term "between" mentioned above does not only refer to the orientation or position, but also includes the interaction between different parts.

[0043] Although this article uses terms such as outer cover 1, cover part 11, slot 12, fan blade 2, hub 21, ring wall 211, arc top 212, blade 22, inner end side 221, outer end side 222, motor 3, drive shaft 31, base 4, outer shell 41, wiring channel 411, base 42, receiving cavity 421, connecting part 43, receiving part 44, receiving groove 441, through hole 442, wiring part 45, wire groove 451, check valve 5, housing 51, channel 511, air inlet 512, air outlet 513, base 514, guide plate 515, first baffle 52, second baffle 53, reset assembly 54, wire groove cover 6, first cover 61, second cover 62, cover plate 7, connecting column 71, air intake space 8, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A silent ventilation fan, characterized in that: The device includes an outer cover, fan blades, a motor, and a base. The base includes a housing and a pedestal. One end of the pedestal corresponding to the outer cover is the front end. The pedestal is located inside the rear end of the housing and has a receiving cavity with a front opening. The motor is located inside the receiving cavity and is detachably connected to the pedestal via a connector. The motor includes a drive shaft connected to the fan blades. The fan blades are located at one end of the pedestal corresponding to the outer cover. The housing and the pedestal are connected by multiple evenly arranged connecting parts. The connecting parts are inclined from the front end to the rear end. The fan blades include a hub connected to the drive shaft and blades evenly arranged around the hub. The blades are inclined in the opposite direction to the connecting parts.

2. A silent ventilation fan according to claim 1, characterized in that: The connecting part is inclined clockwise from the front end to the rear end, and the blade is inclined counterclockwise from the front end to the rear end. The angle between the two inclinations is α, where 103°≤α≤147°.

3. A silent ventilation fan according to claim 2, characterized in that: The blades are twisted, and the middle part of the blades bulges in a counterclockwise direction.

4. A silent ventilation fan according to claim 2, characterized in that: The blade includes an inner end side connected to the hub and an outer end side opposite to it. The angle of inclination of the inner end side relative to the axis of the hub is b, where 23°≤b≤45°, and the angle of inclination of the outer end side relative to the axis of the hub is c, where 44°≤c≤46°.

5. A silent ventilation fan according to claim 4, characterized in that: The hub is cap-shaped, and includes a ring wall and an arc apex connected to the front of the ring wall. The connection between the ring wall and the arc apex is an arc transition connection. The inner end side is connected to the front of the ring wall and extends obliquely to the arc apex.

6. A silent ventilation fan according to claim 1, characterized in that: The angle of inclination of the connecting part relative to the axis of the base is d, where 10°≤d≤31°.

7. A silent ventilation fan according to claim 1, characterized in that: A check valve is provided at the rear end of the base. The check valve includes a housing connected to the base. A channel is provided inside the housing. The front end of the channel is an air inlet and the rear end is an air outlet. A first baffle and a second baffle, which are adapted to the air outlet and symmetrically arranged, are provided in the channel near the air outlet. A reset component for driving the first baffle and the second baffle to close at the air outlet position is provided behind the first baffle and the second baffle. A base is provided at the center of one end of the housing corresponding to the air inlet. Multiple guide plates are evenly arranged around the base inside the housing. The guide plates are inclined from the front end to the rear end and in the same inclination direction as the connecting part.

8. A silent ventilation fan according to claim 1, characterized in that: The outer casing has a receiving part at one end corresponding to the outer cover. The receiving part has a receiving groove for accommodating the circuit board. The middle of the receiving part has a through hole for inserting the fan blade. The outer cover includes a covering part for covering the receiving groove. The base has a wiring part connected to the outer casing on one side. The wiring part has a wire groove with an opening at the front end. The outer casing has a wiring channel at the position corresponding to the wire groove. One end of the wiring channel is connected to the receiving groove, and the other end is connected to the wire groove.

9. A silent ventilation fan according to claim 8, characterized in that: The front end of the wiring section is provided with a wire groove cover, which includes a first cover for covering the wire groove and a second cover for covering the wiring channel. The first cover and the second cover are arranged in an L-shape.

10. A silent ventilation fan according to claim 1, characterized in that: The front end of the outer cover is provided with a cover plate for blocking the through hole. The front end of the outer cover is provided with a slot. The cover plate is provided with a connecting post that matches the slot at the corresponding position. The cover plate is inserted into the slot and connected to the outer cover through the connecting post. An air intake space that communicates with the through hole is provided between the cover plate and the outer cover.

Images