Silent pipeline fan

Abstract

The utility model provides a mute pipeline fan which comprises a shell, an air inlet, an air outlet, a wind wheel and a motor, the motor is fixedly installed on the shell, and the wind wheel comprises a cylindrical impeller body, an air resistance attenuation part and a plurality of supporting frames. An air resistance attenuation part is arranged in the center of an impeller body, a plurality of connecting ribs are arranged on the air resistance attenuation part at intervals in the circumferential direction, the connecting ribs are bent on the reverse side opposite to rotation of the impeller body, and the connecting ribs can be gradually thinned in the direction opposite to the conical direction of a plurality of blades. The connecting ribs are bent in the direction opposite to the rotating direction of the blades, when the blades rotate, the connecting ribs scatter air entering the blades, a boundary layer formed when the air flows into the blades is damaged, the friction resistance between the blades and the entering air in the rotating process of the blades is reduced, and therefore noise generated when the blades drive the air to rotate is reduced, and the service life of the blades is prolonged. And the mute effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of fan equipment technology, specifically to a silent duct fan. Background Technology

[0002] Silent duct fans are ventilation devices specifically designed to reduce operating noise. They are widely used in places requiring a quiet environment (such as homes, offices, hotels, hospitals, etc.). Their core feature is the combination of efficient ventilation and low-noise technology, ensuring that air is delivered while minimizing interference with the surrounding environment.

[0003] In existing technologies, noise reduction measures for silent duct fans typically involve using brushless DC motors or high-quality AC motors to ensure smooth operation and reduce mechanical friction and vibration noise, or using sound-insulating materials for the casing. For example, the Chinese utility model patent with authorization announcement number CN218509755U and patent name "A Silent Duct Fan" uses a layer of glass wool, a layer of hemp felt, and a layer of polystyrene granules to absorb and isolate noise, preventing excessive noise during the operation of the fan itself.

[0004] While adding sound insulation material inside the fan casing can effectively reduce noise, the sound insulation material may degrade in sound absorption performance over time due to aging, dust accumulation, or moisture. In addition, the sound insulation material may hinder heat dissipation inside the fan, causing the temperature of the motor or electronic components to rise, affecting the lifespan or operational stability of the equipment. Utility Model Content

[0005] In view of the defects existing in the prior art, the purpose of this utility model is to provide a silent duct fan to solve the problems of reduced sound insulation performance and reduced heat dissipation performance caused by the use of sound insulation materials in existing silent duct fans.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This application provides a silent duct fan, including a housing, an air inlet, and an air outlet, as well as an impeller and a motor. The motor is fixedly mounted on the housing. The impeller includes a cylindrical impeller body, an air resistance attenuation section, and multiple support frames. The air resistance attenuation section includes a circular main body and an air resistance attenuation device. A motor mounting section extending upward is provided at the center of the main body, and the motor mounting section has a motor mounting hole. The air resistance attenuation device includes several connecting ribs spaced apart along the circumferential direction. The top end of each connecting rib is fixedly connected to the top end of the motor mounting section, and the bottom end of each connecting rib is fixedly connected to the main body. The connecting ribs are bent in the opposite direction to the rotation of the impeller body. The multiple support frames are spaced apart along the circumferential direction. One end of each support frame is fixedly mounted on the inner wall of the impeller body, and the other end of each support frame is fixedly mounted on the outer edge of the main body.

[0008] Furthermore, the impeller body includes an upper connecting frame, a lower connecting frame, and multiple blades. The multiple blades are spaced apart between the upper connecting frame and the lower connecting frame in a circumferential direction. The opposite ends of the blades are fixedly connected to the upper connecting frame and the lower connecting frame, respectively. The other end of the support frame is fixedly installed on the inner edge of the lower connecting frame.

[0009] Furthermore, the blade is conical, and the width of the blade gradually decreases from one end connected to the upper connecting frame toward the other end connected to the lower connecting frame.

[0010] Furthermore, the external dimensions of the connecting rib gradually taper in the direction opposite to the conical direction of the blade.

[0011] Furthermore, one end of the blade is connected to the outer edge of the upper connecting frame, and the other end of the blade is connected to the inner edge of the lower connecting frame.

[0012] The beneficial effects of this utility model are as follows:

[0013] By employing the aforementioned silent duct fan, an air resistance attenuation section is provided at the center of the impeller body. This section contains multiple connecting ribs arranged circumferentially and bent in the opposite direction to the impeller body's rotation. These connecting ribs gradually taper in the opposite direction to the conical direction of the blades and bend in the opposite direction to the blades' rotation. When the blades rotate, these connecting ribs disperse the air entering the blades, disrupting the boundary layer formed as the air flows into the blades. This reduces the frictional resistance between the blades and the incoming air during blade rotation, thereby reducing the noise generated when the blades drive the air to rotate, achieving a silent effect. This solves the problem of existing silent fans relying on sound-insulating materials leading to a decline in sound insulation performance and affecting the fan's heat dissipation performance. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the silent duct fan in the embodiments of this application.

[0015] Figure 2 This is a three-dimensional structural diagram of the wind turbine in the embodiments of this application.

[0016] Figure 3 This is a top view structural diagram of the wind turbine in an embodiment of this application.

[0017] Figure 4 This is a three-dimensional structural diagram of the wind turbine in another angular direction in an embodiment of this application.

[0018] In the picture:

[0019] 10-Silent duct fan;

[0020] 100 - Housing;

[0021] 200 - Air Inlet;

[0022] 300-Air outlet;

[0023] 400-Motor;

[0024] 500-Wind rotor, 501-Upper connecting frame, 502-Blade, 503-Lower connecting frame, 504-Supporting frame, 505-Main body, 506-Connecting rib, 507-Motor mounting part. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] See appendix Figure 1As shown, this embodiment provides a silent duct fan 10, including a housing 100, an air inlet 200, an air outlet 300, a fan wheel 500, and a motor 400. The air inlet 200 and the air outlet 300 are respectively disposed on opposite sides of the housing 100. The fan wheel 500 is installed in the inner cavity of the housing 100, and the air inlet 200 and the air outlet 300 are respectively connected to the fan wheel 500 so that when the fan wheel 500 rotates, air can be drawn in from the air inlet 200 and sent to the air outlet 300 for outward flow when the fan wheel 500 rotates. The motor 400 is fixedly installed on the housing 100 and is connected to the fan wheel 500 for driving the fan wheel 500 to rotate.

[0027] See attached document Figure 2 To be continued Figure 4 As shown, in this embodiment, the impeller 500 includes a cylindrical impeller body, an air resistance attenuation section, and multiple support frames 504. The air resistance attenuation section includes a circular main body 505 and an air resistance attenuation device. The main body 505 is located at the center of one end of the impeller body. A motor mounting section 507 extending upward is provided at the center of the main body 505, and the motor mounting section 507 has a motor mounting hole.

[0028] When installing motor 400, the output shaft of motor 400 is inserted into the motor mounting hole and extends outward. The extended part of the output shaft of motor 400 is locked onto the motor mounting hole by a nut.

[0029] In this embodiment, the air resistance attenuation device includes a plurality of connecting ribs 506 spaced apart along the circumferential direction. The top end of the connecting rib 506 is fixedly connected to the top end of the motor mounting part 507, and the bottom end of the connecting rib 506 is fixedly connected to the main body part 505. The connecting ribs 506 are bent in the opposite direction to the rotation of the impeller body. For example, if the rotation direction of the impeller body is counterclockwise, then the connecting ribs 506 are bent in the clockwise direction. With this arrangement, when the impeller body rotates, the air drawn into the impeller body will come into contact with the connecting ribs 506. Since the bending direction of the connecting ribs 506 is opposite to the rotation direction of the impeller body, the connecting ribs 506 disperse the drawn-in air, breaking the boundary layer formed when the air flows into the blades 502, reducing the frictional resistance between the blades 502 and the incoming air during the rotation process, thereby reducing the noise generated when the blades 502 drive the air to rotate, achieving a noise reduction effect.

[0030] See attached document Figure 2 As shown, in some embodiments, the external dimensions of the connecting rib 506 gradually taper in the direction opposite to the conical direction of the blade 502.

[0031] Continue to refer to the appendix Figure 2As shown, multiple support frames 504 are spaced apart along the circumferential direction. One end of the support frame 504 is fixedly installed on the inner wall of the impeller body, and the other end of the support frame 504 is fixedly installed on the outer edge of the main body 505. The support frame 504 is used to realize the installation of the air resistance attenuation part on the impeller body.

[0032] See attached document Figure 2 As shown, in this embodiment, the impeller body includes an upper connecting frame 501, a lower connecting frame 503, and a plurality of blades 502. The plurality of blades 502 are spaced apart between the upper connecting frame 501 and the lower connecting frame 503 along the circumferential direction. The opposite ends of the blades 502 are fixedly connected to the upper connecting frame 501 and the lower connecting frame 503, respectively. The other end of the support frame 504 is fixedly installed on the inner edge of the lower connecting frame 503.

[0033] See attached document Figure 2 As shown, in some embodiments, the blade 502 is conical, and the width of the blade 502 gradually decreases from one end connected to the upper connecting frame 501 toward the other end connected to the lower connecting frame 503. The width of the blade 502 can affect the flow channel of the fluid, and the width can gradually narrow in the direction of fluid flow, thereby increasing the speed of the flow channel.

[0034] See attached document Figure 4 As shown, in some embodiments, one end of the blade 502 is connected to the outer edge of the upper connecting frame 501, and the other end of the blade 502 is connected to the inner edge of the lower connecting frame 503. This arrangement can increase the length of the blade 502 and improve the air intake.

[0035] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A silent duct fan, comprising a housing, an air inlet, and an air outlet, characterized in that, It also includes a wind turbine and a motor. The motor is fixedly mounted on the housing. The wind turbine includes a cylindrical impeller body, an air resistance attenuation section, and multiple support frames. The air resistance attenuation section includes a circular main body and an air resistance attenuation device. A motor mounting section extending upward is provided at the center of the main body. The motor mounting section has a motor mounting hole. The air resistance attenuation device includes several connecting ribs spaced apart along the circumferential direction. The top end of the connecting rib is fixedly connected to the top end of the motor mounting section, and the bottom end of the connecting rib is fixedly connected to the main body. The connecting rib is bent in the opposite direction to the rotation of the impeller body. Multiple support frames are spaced apart along the circumferential direction. One end of the support frame is fixedly mounted on the inner wall of the impeller body, and the other end of the support frame is fixedly mounted on the outer edge of the main body.

2. A silent duct fan according to claim 1, characterized in that, The impeller body includes an upper connecting frame, a lower connecting frame, and multiple blades. The multiple blades are spaced apart between the upper connecting frame and the lower connecting frame in a circumferential direction. The opposite ends of the blades are fixedly connected to the upper connecting frame and the lower connecting frame, respectively. The other end of the support frame is fixedly installed on the inner edge of the lower connecting frame.

3. A silent duct fan according to claim 2, characterized in that, The blade is conical, and the width of the blade gradually decreases from the end connected to the upper connecting frame to the other end connected to the lower connecting frame.

4. A silent duct fan according to claim 3, characterized in that, The connecting rib gradually tapers in the direction opposite to the tapered direction of the blade.

5. A silent duct fan according to claim 2, characterized in that, One end of the blade is connected to the outer edge of the upper connecting frame, and the other end of the blade is connected to the inner edge of the lower connecting frame.

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