Multi-wing low-noise centrifugal fan

Abstract

The multi-wing type low-noise centrifugal fan comprises a protective cover, an air outlet square pipe is fixedly connected to the outer surface of the protective cover, a silencing frame is arranged in the air outlet square pipe, second ventilation holes are formed in the silencing frame, arc-shaped blocks are fixedly connected to the front side and the rear side of the interior of the silencing frame, and the front side and the rear side of the interior of the silencing frame are provided with first ventilation holes. First ventilation holes are formed in the arc-shaped blocks and communicate with the front sides and the rear sides of the arc-shaped blocks, positioning blocks are fixedly connected to the four corners of the upper surface of the silencing frame, positioning grooves are formed in the positioning blocks, and positioning bolts are slidably connected to the interiors of the positioning grooves. And the positioning bolt is in threaded connection with the interior of the air outlet square pipe. Through the structural design of the silencing frame, airflow noise can be effectively absorbed and dispersed, the overall noise level during operation of the fan is reduced, the second ventilation holes formed in the silencing frame increase the passing area of airflow, turbulent flow and resistance generated when the airflow passes are reduced, and therefore noise is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field, concretely is a kind of multi-wing low-noise centrifugal fan. BACKGROUND

[0002] With the development of industrialization and urbanization, the requirement of air circulation and quality is higher and higher, multi-wing centrifugal fan can produce larger air volume and air pressure at lower speed through its unique wing design, meet the demand of efficient airflow delivery.

[0003] The existing multi-wing centrifugal fan is difficult to be applied in hospital, library, recording studio and other places with strict noise requirement due to excessive noise. INVENTION CONTENTS

[0004] The utility model discloses a kind of multi-wing low-noise centrifugal fan, the structure design of sound-absorbing frame can effectively absorb and disperse airflow noise, reduce the overall noise level when fan operates, the second vent hole opened in the inside of sound-absorbing frame increases the passing area of airflow, reduces turbulence and resistance when airflow passes, to reduce noise generation.

[0005] To achieve the above object, provide a kind of multi-wing low-noise centrifugal fan, comprising: protective cover, the outer surface of the protective cover is fixedly connected with air outlet square tube, the inside of the air outlet square tube is provided with sound-absorbing frame, the inside of the sound-absorbing frame is opened with second vent hole, the inside of the sound-absorbing frame is fixedly connected with arc block on both sides, the inside of the arc block is opened with first vent hole, and first vent hole is communicated with the front and rear sides of arc block, the upper surface of the sound-absorbing frame is fixedly connected with positioning block in four corners, the inside of the positioning block is opened with positioning slot, the inside of the positioning slot is slidably connected with positioning bolt, and positioning bolt is connected with the inside of air outlet square tube by screw thread. Through screw thread connection, ensure the stability of sound-absorbing frame, avoid displacement or looseness, improve overall noise reduction effect.

[0006] According to the multi-wing low-noise centrifugal fan, the number of second vent holes is several, and each second vent hole is communicated with the inner and outer surfaces of the sound-absorbing frame. Multiple second vent holes optimize airflow distribution, reduce noise generation and improve fan operation efficiency.

[0007] According to the multi-wing low-noise centrifugal fan, the arc block is located below the second vent hole, and the first vent hole and the second vent hole are arranged in parallel. The position of the arc block optimizes airflow guidance, reduces noise and improves airflow stability.

[0008] According to the multi-wing low-noise centrifugal fan, the upper surface of the air outlet square pipe is fixedly connected with a second fixed block, eight second positioning holes are arranged in the inside of the second fixed block, and the eight second positioning holes are arranged around the second fixed block.

[0009] According to the multi-wing low-noise centrifugal fan, the front surface of the protective cover is fixedly connected with an air inlet square pipe, the front surface of the air inlet square pipe is fixedly connected with a first fixed block, eight first positioning holes are arranged in the inside of the first fixed block, and the eight first positioning holes are arranged around the first fixed block.

[0010] According to the multi-wing low-noise centrifugal fan, the rear surface of the protective cover is fixedly connected with a motor, the output end of the motor is fixedly connected with a rotating column, and the rotating column extends to the inside of the protective cover. The eight first positioning holes ensure that the air inlet square pipe is stably installed, and reduce vibration noise and the risk of structural looseness.

[0011] According to the multi-wing low-noise centrifugal fan, the outer surface of the rotating column is fixedly connected with a rear baffle, and the front surface of the rear baffle is fixedly connected with a plurality of wing blades. The wing blades are arranged to facilitate airflow and efficient circulation.

[0012] According to the multi-wing low-noise centrifugal fan, the front surface of each wing blade is fixedly connected with a front baffle, and the inner surface of the front baffle is fixedly connected with a pressure boosting restraint block. The pressure boosting restraint block optimizes airflow pressure distribution, reduces noise and improves fan performance and energy efficiency.

[0013] Compared with the prior art, the multi-wing low-noise centrifugal fan has the following beneficial effects:

[0014] The sound-absorbing frame, the second vent hole, the arc block, the first vent hole, the positioning block, the positioning groove and the positioning bolt are arranged, and the structure of the sound-absorbing frame is designed, so that the airflow noise can be effectively absorbed and dispersed, the overall noise level during operation of the fan is reduced, the second vent hole arranged in the sound-absorbing frame increases the airflow passing area, reduces the turbulence and resistance during airflow passing, and the noise is reduced.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below in combination with the drawings and embodiments.

[0017] Figure 1 It is a perspective view of the multi-wing low-noise centrifugal fan of the present application.

[0018] Figure 2 Figure 2 is a side view of the multi-wing low-noise centrifugal fan of the present application;

[0019] Figure 3 Figure 3 is a cross-sectional view of the multi-wing low-noise centrifugal fan of the present application;

[0020] Figure 4 Figure 4 is a structure enlarged view of the multi-wing low-noise centrifugal fan of the present application Figure 3 Figure 5 is a structure enlarged view of the multi-wing low-noise centrifugal fan of the present application

[0021] Figure 1: 1, protective cover; 2, air inlet square tube; 3, first fixed block; 4, first positioning hole; 5, air outlet square tube; 6, second fixed block; 7, second positioning hole; 8, rotating column; 9, pressure boosting restraint block; 10, front baffle; 11, wing blade; 12, rear baffle; 13, first ventilation hole; 14, motor; 15, sound attenuation frame; 16, positioning block; 17, positioning groove; 18, positioning bolt; 19, second ventilation hole; 20, arc block. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be apparently and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figures 1-4 The present application provides a technical solution: a multi-wing low-noise centrifugal fan, comprising: a protective cover 1, the outer surface of the protective cover 1 is fixedly connected with an air outlet square tube 5 for guiding and discharging airflow, the inside of the air outlet square tube 5 is provided with a sound attenuation frame 15 for reducing the noise during operation of the fan 14, the inside of the sound attenuation frame 15 is provided with a second ventilation hole 19 for increasing the passing area of airflow, the front and rear sides of the inside of the sound attenuation frame 15 are both fixedly connected with arc blocks 20 for supporting and guiding airflow, the inside of the arc blocks 20 is provided with first ventilation holes 13 for further dispersing and reducing airflow noise, and the first ventilation holes 13 are in communication with the front and rear sides of the arc blocks 20 to ensure smooth passing of airflow, the upper surface of the sound attenuation frame 15 is fixedly connected with positioning blocks 16 at four corners for fixing the position of the sound attenuation frame 15, the inside of the positioning blocks 16 is provided with positioning grooves 17 for installing positioning bolts 18, the inside of the positioning grooves 17 is slidably connected with the positioning bolts 18 for fixing the sound attenuation frame 15 in the air outlet square tube 5, and the positioning bolts 18 are in threaded connection with the inside of the air outlet square tube 5 to ensure the stability of the sound attenuation frame 15.

[0024] The number of the second vent holes 19 is several, which is used for optimizing the distribution of air flow and noise control, each of the second vent holes 19 is communicated with the inner and outer surfaces of the soundproof frame 15, which ensures the uniform air flow, the arc block 20 is located below the second vent hole 19, which is used for guiding the air flow to the second vent hole 19, the first vent hole 13 and the second vent hole 19 are arranged in parallel, which jointly act to reduce noise and optimize air flow, the upper surface of the air outlet square tube 5 is fixedly connected with the second fixing block 6, which is used for fixing the position of the air outlet square tube 2, the inside of the second fixing block 6 is provided with eight second positioning holes 7, which is used for installing and fixing the fan assembly, and the eight second positioning holes 7 are arranged around the second fixing block 6, which ensures uniform and stable fixation, the front surface of the protective cover 1 is fixedly connected with the air inlet square tube 2, which is used for guiding the external air flow into the fan, the front surface of the air inlet square tube 2 is fixedly connected with the first fixing block 3, which is used for fixing the position of the air inlet square tube 2, the inside of the first fixing block 3 is provided with eight first positioning holes 4, which is used for installing and fixing the air inlet square tube, and the eight first positioning holes 4 are arranged around the first fixing block 3, which ensures uniform and stable fixation, the rear surface of the protective cover 1 is fixedly connected with the motor 14, which is used for driving the operation of the fan, the output end of the motor 14 is fixedly connected with the rotating column 8, which is used for transmitting the power of the motor 14, and the rotating column 8 extends to the inside of the protective cover 1, which is used for connecting the rotating assembly inside the fan, the outer surface of the rotating column 8 is fixedly connected with the rear baffle 12, which is used for supporting and fixing the wing blade 11, the front surface of the rear baffle 12 is fixedly connected with a plurality of wing blades 11, which is used for generating air flow and increasing wind pressure, the front surface of each wing blade 11 is fixedly connected with the front baffle 10, which is used for enhancing the directivity of air flow, the inner surface of the front baffle 10 is fixedly connected with the pressure boosting restraint block 9, which is used for optimizing the air flow pressure and distribution.

[0025] Working principle: the protective cover 1 is fixed at the specified position through the first fixing block 3 and the second fixing block 6, the first positioning hole 4 and the second positioning hole 7 are used to cooperate with the bolt for fastening, which ensures the stable installation of the fan, the motor 14 is connected to the power supply, which ensures that the power supply voltage matches the rated voltage of the motor, and checks whether the circuit connection is safe and reliable, starts the motor 14, the motor 14 drives the rotating column 8 to rotate, the rear baffle 12 and the wing blade 11 on the rotating column 8 rotate, and the air flow is generated, the external air flow enters the fan through the air inlet square tube 2, the design of the air inlet square tube 2 ensures that the air flow enters uniformly, reduces turbulence and noise, the wing blade 11 rotates, the air flow passes between the front baffle 10 and the pressure boosting restraint block 9, the pressure boosting restraint block 9 optimizes the air flow pressure, which ensures the efficient flow of air flow, the air flow is discharged from the air outlet square tube 5 through the action of the rear baffle 12 and the wing blade 11. The soundproof frame 15 and the arc block 20 inside the air outlet square tube 5 further reduce the noise through the first vent hole 13 and the second vent hole 19, which ensures that the air flow is smoothly discharged, the design of the soundproof frame 15 and the arc block 20 effectively disperses and absorbs the noise of the air flow, at the same time, the positioning block 16 and the positioning bolt 18 ensure the stable installation of the soundproof frame 15, which avoids additional noise caused by vibration.

[0026] The utility model embodiment has been explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, still can make various changes in the knowledge range possessed by the ordinary skilled in the art without departing from the utility model's tenet.

Claims

1. A multi-bladed low noise centrifugal fan comprising: The protective cover (1) outer surface fixedly connected with the air outlet square tube (5), characterized by: the inside of the air outlet square tube (5) is provided with sound-absorbing frame (15), the inside of the sound-absorbing frame (15) is provided with second vent hole (19), the inside of the sound-absorbing frame (15) is fixedly connected with arc block (20) on both sides, the inside of the arc block (20) is provided with first vent hole (13), and first vent hole (13) is communicated with the front and back sides of arc block (20), the upper surface of the sound-absorbing frame (15) is fixedly connected with positioning block (16), the inside of the positioning block (16) is provided with positioning groove (17), the inside of the positioning groove (17) is slidably connected with positioning bolt (18), and the positioning bolt (18) is screw connected with the inside of the air outlet square tube (5).

2. A multiple-bladed low-noise centrifugal fan as claimed in claim 1, characterized in that: The number of second vent holes (19) is several, and each second vent hole (19) is communicated with the inner and outer surfaces of the sound-absorbing frame (15).

3. A multiple-bladed low-noise centrifugal fan as claimed in claim 1, characterized in that: The arc block (20) is located below the second vent hole (19), and the first vent hole (13) and the second vent hole (19) are arranged in parallel.

4. A multiple blade low noise centrifugal fan as claimed in claim 1, wherein: The upper surface of the air outlet square tube (5) is fixedly connected with the second fixed block (6), the inside of the second fixed block (6) is provided with eight second positioning holes (7), and the eight second positioning holes (7) are arranged on the periphery of the second fixed block (6).

5. A multiple blade low noise centrifugal fan as claimed in claim 1, wherein: The front surface of the protective cover (1) is fixedly connected with the air inlet square tube (2), the front surface of the air inlet square tube (2) is fixedly connected with the first fixed block (3), the inside of the first fixed block (3) is provided with eight first positioning holes (4), and the eight first positioning holes (4) are arranged on the periphery of the first fixed block (3).

6. A multiple blade low noise centrifugal fan as claimed in claim 1, wherein: The rear surface of the protective cover (1) is fixedly connected with the motor (14), the output end of the motor (14) is fixedly connected with the rotating column (8), and the rotating column (8) extends into the inside of the protective cover (1).

7. A multiple blade low noise centrifugal fan as claimed in claim 6, wherein: The outer surface of the rotating column (8) is fixedly connected with the back baffle (12), and the front surface of the back baffle (12) is fixedly connected with a plurality of wing blades (11).

8. A multiple blade low noise centrifugal fan as claimed in claim 7, wherein: The front surface of each wing blade (11) is fixedly connected with the front baffle (10), and the inner surface of the front baffle (10) is fixedly connected with the booster restraint block (9).

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