CN219691849U - Noise reduction structure for air outlet of centrifugal fan - Google Patents

Abstract

The utility model discloses a noise reduction structure of an air outlet of a centrifugal fan, and relates to the technical field of centrifugal fans, comprising a volute; the noise reduction mechanism comprises a noise reduction barrel, noise absorption cotton and a noise absorption block, wherein the noise reduction barrel is fixedly arranged in the air outlet pipe, an installation cavity is formed in the noise reduction barrel, the noise absorption block is fixedly arranged on one side of the noise absorption cotton, and a noise absorption hole communicated with the installation cavity is formed in the noise reduction barrel; according to the technical scheme provided by the utility model, the noise reduction mechanism is adopted, noise generated in the centrifugal fan is discharged through the air outlet pipe when the centrifugal fan is used, sound waves passing through the air outlet pipe in the process can enter the installation cavity through the sound absorption holes, when the sound waves enter the installation cavity from the sound absorption holes, the sound waves continuously rebound in the installation cavity under the influence of the sound absorption blocks, and the sound absorption cotton is matched to attenuate the sound waves so as to reduce the noise generated in the air outlet pipe, reduce the influence of the noise on the environment, and simultaneously enable the centrifugal fan to be used in occasions with requirements on the size of the sound.

Description

Noise reduction structure for air outlet of centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a noise reduction structure of an air outlet of a centrifugal fan.

Background

The centrifugal fan is a machine which increases the pressure of gas and discharges the gas by means of input mechanical energy, and is a driven fluid machine. Centrifugal fans are widely used for ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial kilns; cooling and ventilation in air-conditioning devices and household appliances; drying and selecting grains; inflation and propulsion of wind tunnel wind source and air cushion ship, etc.

In the working process of the conventional centrifugal fan, the air outlet of the conventional centrifugal fan generates large noise, the working environment is extremely influenced, and if a person works in the noise environment for a long time, the physical and mental health of the worker is easily damaged.

Disclosure of Invention

The utility model aims to solve the technical problem of overcoming the defects of the prior art and providing a noise reduction structure of an air outlet of a centrifugal fan, which is used for solving the problem that the air outlet of the centrifugal fan in the prior art generates larger noise.

In view of the above, the utility model provides a noise reduction structure of an air outlet of a centrifugal fan, which comprises a volute, wherein an impeller is rotationally connected inside the volute, an air outlet pipe is fixedly arranged inside the volute, and a noise reduction mechanism is arranged inside the air outlet pipe;

the noise reduction mechanism comprises a noise reduction barrel, sound absorption cotton and a sound absorption block, wherein the noise reduction barrel is fixedly arranged inside the air outlet pipe, an installation cavity is formed in the noise reduction barrel, the sound absorption cotton is fixedly arranged inside the installation cavity, the sound absorption block is fixedly arranged on one side of the sound absorption cotton, a plurality of sound absorption blocks are arranged, and sound absorption holes communicated with the installation cavity are formed in the noise reduction barrel.

Optionally, the sound absorbing holes are formed in a plurality of ways.

Optionally, the sound absorbing block is located at one side of the sound absorbing hole.

Optionally, a chamfer is formed at the bottom of the inner wall of the silencing barrel.

Optionally, the top of the air outlet pipe is fixedly provided with a buffer cushion, a buffer cavity is formed in the buffer cushion, and a buffer piece is fixedly arranged in the buffer cavity.

Optionally, the cushion pad and the air outlet pipe are provided with a plurality of mounting holes.

From the above technical solutions, the embodiment of the present utility model has the following advantages:

1. according to the noise reduction structure for the air outlet of the centrifugal fan, the noise reduction mechanism is adopted, noise generated in the centrifugal fan can be discharged through the air outlet pipe when the noise reduction structure is used, sound waves passing through the air outlet pipe in the process can enter the installation cavity through the sound absorption holes, when the sound waves enter the installation cavity from the sound absorption holes, the sound waves continuously rebound in the installation cavity under the influence of the sound absorption blocks, and the sound waves are attenuated by matching with the sound absorption cotton so as to reduce the noise generated at the air outlet pipe, reduce the influence of the noise on the environment, and meanwhile, the centrifugal fan can be used in occasions with requirements on the size of the sound.

2. According to the noise reduction structure for the air outlet of the centrifugal fan, the buffer cushion is adopted, so that the effect of buffering and supporting can be achieved, and noise generated by collision between the air outlet pipe and an external pipeline when the centrifugal fan operates is avoided.

These features and advantages of the present utility model will be disclosed in detail in the following detailed description and the accompanying drawings.

Drawings

The utility model is further described with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

fig. 3 is an enlarged view of fig. 2 a in accordance with the present utility model.

Reference numerals illustrate: 1. a volute; 2. an air outlet pipe; 3. an impeller; 4. a cushion pad; 5. a mounting hole; 6. a sound deadening cylinder; 7. a mounting cavity; 8. a sound absorbing hole; 9. sound absorbing cotton; 10. a sound-absorbing block; 11. a buffer chamber; 12. and a buffer member.

Detailed Description

The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.

The following specifically describes a noise reduction structure for an air outlet of a centrifugal fan according to an embodiment of the present utility model with reference to the accompanying drawings.

Example 1

In order to facilitate understanding, referring to fig. 1 to 3, an embodiment of a noise reduction structure for an air outlet of a centrifugal fan provided by the utility model comprises a volute 1, wherein an impeller 3 is rotationally connected inside the volute 1, the connecting end of the impeller 3 is positioned at one side of the volute 1, an air inlet matched with the impeller 3 is formed inside the volute 1, an air outlet pipe 2 is fixedly arranged inside the volute 1, and a noise reduction mechanism is arranged inside the air outlet pipe 2;

noise reduction mechanism includes amortization section of thick bamboo 6, inhales sound cotton 9 and inhale sound piece 10, and amortization section of thick bamboo 6 fixed mounting is inside out tuber pipe 2, and installation cavity 7 has been seted up to amortization section of thick bamboo 6 inside, inhales sound cotton 9 fixed mounting in installation cavity 7 inside, inhale sound piece 10 fixed mounting and inhale sound cotton 9 one side, inhale sound piece 10 and be provided with a plurality of, and amortization section of thick bamboo 6 is inside to be seted up and to inhale sound hole 8 that is linked together with installation cavity 7.

It should be noted that, during the use noise that centrifugal fan inside produced can be discharged through air-out pipe 2, the sound wave that goes through air-out pipe 2 at this in-process can get into the installation cavity 7 inside through inhaling sound hole 8, through with sound absorbing block 10 setting with inhale sound hole 8 one side, can be under the influence of inhaling sound block 10 constantly rebound in installation cavity 7 inside when sound wave gets into installation cavity 7 inside from inhaling sound hole 8, cooperate again and inhale sound cotton 9 and make sound wave decay so that reduce the noise that air-out pipe 2 department produced, noise's influence to the environment, make centrifugal fan can use in some occasions that have the requirement to sound size simultaneously.

In some embodiments, as shown in fig. 3, the sound absorbing holes 8 are formed in several numbers, and the sound absorbing block 10 is located at one side of the sound absorbing holes 8.

It should be noted that, the sound absorbing hole 8 is an oblique hole, the sound absorbing block 10 is a trapezoid block, and by arranging the sound absorbing block 10 on one side of the sound absorbing hole 8, when sound waves enter the installation cavity 7 from the sound absorbing hole 8, the sound waves continuously rebound in the installation cavity 7 under the influence of the sound absorbing block 10, so that the noise generated at the air outlet pipe 2 is reduced by attenuation.

In some embodiments, as shown in fig. 2, the bottom of the inner wall of the sound deadening cylinder 6 is provided with a chamfer.

The bottom of the silencing cylinder 6 is provided with a chamfer to guide wind, so that the wind outlet of the wind outlet pipe 2 is smoother.

Example 2

In some embodiments, as shown in fig. 3, the top of the air outlet pipe 2 is fixedly provided with a buffer cushion 4, a buffer cavity 11 is formed in the buffer cushion 4, a buffer piece 12 is fixedly installed in the buffer cavity 11, and a plurality of mounting holes 5 are formed in the buffer cushion 4 and the air outlet pipe 2.

It should be noted that, through setting up the cushioning effect that cushioning pad 4 can be strengthened to setting up bolster 12, can use the bolt to be connected out tuber pipe 2 and outside pipeline through setting up mounting hole 5, make cushion 4 be located outside pipeline and go out between tuber pipe 2 through setting up cushion 4 at tuber pipe 2 top to play the effect that the buffering supported, avoid centrifugal fan to go out tuber pipe 2 and outside pipeline collision when operation and produce the noise.

The volute 1, the impeller 3 and the sound absorbing cotton 9 are well known parts and are not described herein.

Working principle: during the use noise that centrifugal fan inside produced can be discharged through tuber pipe 2, the sound wave that goes out tuber pipe 2 through this in-process can get into installation cavity 7 inside through inhaling sound hole 8, through with inhale sound piece 10 setting and inhale sound hole 8 one side, can be under the influence of inhaling sound piece 10 constantly rebound in installation cavity 7 inside when inhaling sound hole 8 department entering installation cavity 7 inside, the cotton 9 of sound absorption of cooperation again makes the sound attenuation so reduce the noise that goes out tuber pipe 2 department and produce, can use the bolt to be connected tuber pipe 2 and outside pipeline through setting up mounting hole 5, through setting up blotter 4 at tuber pipe 2 top and make blotter 4 be located between outside pipeline and the tuber pipe 2, thereby play the effect that buffering supported, play tuber pipe 2 and outside pipeline collision produce noise when avoiding centrifugal fan to operate.

The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (6)

1. The utility model provides a centrifugal fan air outlet structure of making an uproar falls which characterized in that: the novel spiral casing comprises a spiral casing (1), wherein an impeller (3) is rotationally connected inside the spiral casing (1), an air outlet pipe (2) is fixedly arranged inside the spiral casing (1), and a noise reduction mechanism is arranged inside the air outlet pipe (2);

noise reduction mechanism includes amortization section of thick bamboo (6), inhales cotton (9) and inhale sound piece (10), amortization section of thick bamboo (6) fixed mounting is in go out inside tuber pipe (2), installation cavity (7) have been seted up to amortization section of thick bamboo (6) inside, inhale cotton (9) fixed mounting and be in inside installation cavity (7), inhale sound piece (10) fixed mounting inhale cotton (9) one side, inhale sound piece (10) and be provided with a plurality of, amortization section of thick bamboo (6) inside seted up with inhale sound hole (8) that installation cavity (7) are linked together.

2. The noise reduction structure for an air outlet of a centrifugal fan according to claim 1, wherein: the sound absorbing holes (8) are formed in a plurality of mode.

3. The noise reduction structure for an air outlet of a centrifugal fan according to claim 1, wherein: the sound absorption block (10) is positioned at one side of the sound absorption hole (8).

4. The noise reduction structure for an air outlet of a centrifugal fan according to claim 1, wherein: chamfer angles are formed at the bottoms of the inner walls of the silencing barrels (6).

5. The noise reduction structure for an air outlet of a centrifugal fan according to claim 1, wherein: the top of the air outlet pipe (2) is fixedly provided with a buffer cushion (4), a buffer cavity (11) is formed in the buffer cushion (4), and a buffer piece (12) is fixedly arranged in the buffer cavity (11).

6. The noise reduction structure for an air outlet of a centrifugal fan according to claim 5, wherein: the inside of the cushion pad (4) and the air outlet pipe (2) is provided with a plurality of mounting holes (5).