AU2020102294A4

AU2020102294A4 - Noise reducer for fans

Info

Publication number: AU2020102294A4
Application number: AU2020102294A
Authority: AU
Inventors: Jian CHI; Wei Jiang
Original assignee: Jiangsu Yongyi Environmental Protection Technology Co Ltd
Current assignee: Jiangsu Yongyi Environmental Protection Technology Co Ltd
Priority date: 2020-06-22
Filing date: 2020-07-02
Publication date: 2020-10-29
Anticipated expiration: 2028-07-02
Also published as: CN212509001U; WO2021258416A1

Abstract

A b s t r a c t A noise reducer for fans comprises an upper cylinder, a middle cylinder, and a lower cylinder. Cylinder walls of the middle cylinder include an outer cylinder wall and an inner cylinder wall located on the inner side of the outer cylinder. A noise-reduction layer is disposed between the inner cylinder wall and the outer 5 cylinder wall and has a thickness of 7-9cm. The inner cylinder wall is a porous plate. Multiple noise-reduction plates are disposed on the inner cylinder wall of the middle cylinder, are parallelly arranged in the height direction of the middle cylinder at intervals, and include left noise-reduction plates and right noise-reduction plates, wherein the right sides of the left noise-reduction plates are o staggered with the left sides of the right noise-reduction plates, the lower surfaces of the noise-reduction plates are concave-convex surfaces formed by concave parts and convex parts, and the noise-reduction plates are composite plates filled with noise-reduction cotton. An upper conical cap is mounted on the inner side of the upper cylinder, and a lower conical cap is mounted on the inner side of the lower 5 cylinder. Noises can be reduced to 20-30dB from over 100dB by means of repeated echoing and reduction, and the noise reduction effect is satisfactory.

Description

A b s t r a c t

A noise reducer for fans comprises an upper cylinder, a middle cylinder, and a lower cylinder. Cylinder walls of the middle cylinder include an outer cylinder wall and an inner cylinder wall located on the inner side of the outer cylinder. A noise-reduction layer is disposed between the inner cylinder wall and the outer cylinder wall and has a thickness of 7-9cm. The inner cylinder wall is a porous plate. Multiple noise-reduction plates are disposed on the inner cylinder wall of the middle cylinder, are parallelly arranged in the height direction of the middle cylinder at intervals, and include left noise-reduction plates and right noise-reduction plates, wherein the right sides of the left noise-reduction plates are o staggered with the left sides of the right noise-reduction plates, the lower surfaces of the noise-reduction plates are concave-convex surfaces formed by concave parts and convex parts, and the noise-reduction plates are composite plates filled with noise-reduction cotton. An upper conical cap is mounted on the inner side of the upper cylinder, and a lower conical cap is mounted on the inner side of the lower cylinder. Noises can be reduced to 20-30dB from over 100dB by means of repeated echoing and reduction, and the noise reduction effect is satisfactory.

S p e cifica tio n

Noise Reducer for Fans

Technical Field

The utility model relates to the technical field of fan parts, in particular to a noise reducer used for various fans, air inlet/outlet pipes, and the like.

Description of Related Art

Fan noise reducers are usually used to reduce noises of fans. Existing fan noise reducers eliminate wind resistance and isolate noises in fans typically by reducing air power noises at the air inlet of an air passage and dividing the air inlet o into several segments, thus having a good noise reduction effect. However, the existing fan noise reducers have the following problems: multiple anti-noise plates are designed in the fan noise reducers, such that the air flow is hindered; the internal design of the noise reducers is complicated, which makes machining and installation difficult and increases the manufacturing cost; and the existing fan noise reducers are large in size, heavy, inconvenient to carry, and the like.

In addition, part of the existing noise reducers are simple in structure and include a housing, wherein an inner pipe is disposed in the housing, porous noise-absorption materials are filled between the housing and the inner pipe, an air door is fixedly disposed at the air inlet end of the housing with screws, and a plurality of perforated plates are mounted in the inner pipe. However, due to the fact that a plurality of through holes are formed in the inner pipe, noises will not be blocked when passing through the inner pipe. Most noises will be transmitted to the outside from the inner pipe, and only a small part of noises will be absorbed by the noise-absorption materials from the through holes. Hence, the noise reducers of such a structure have an unsatisfying noise reduction effect.

Brief Summary of the Utility Model

The technical issue mainly to be settled by the utility model is to provide a

S p e cifica tio n

noise reducer for fans. Noises enter the noise reducer via an air inlet, are echoed to a middle cylinder by a lower conical cap, are then echoed to an upper conical cap after being absorbed and reduced by a porous plate, noise-reduction plates parallelly arranged in a staggered manner and a noise-reduction layer, and are finally discharged via an air outlet. In this process, the noises are repeatedly echoed and reduced and thus can be reduced to 20-30dB from over 100dB, and the noise reduction effect is satisfactory. One technical solution adopted by the utility model to settle the aforesaid technical issue is as follows: a noise reducer for fans comprises upper cylinder, a o middle cylinder, and a lower cylinder, wherein the cross-sections of the upper cylinder, the middle cylinder and the lower cylinder are rectangular, an aperture of the upper cylinder becomes smaller gradually from bottom to top, an aperture of the lower cylinder becomes smaller gradually from top to bottom, the lower end of the lower cylinder is connected to an air inlet, and the upper end of the upper cylinder is connected to an air outlet: Cylinder walls of the middle cylinder include an outer wall cylinder and an inner wall cylinder located on the inner side of the outer cylinder wall, a noise-reduction layer is disposed between the inner cylinder wall and the outer cylinder wall and has a thickness of 7-9cm, and the inner cylinder wall is a porous plate; Multiple noise-reduction plates are arranged on the inner cylinder wall of the middle cylinder and are perpendicular to the inner cylinder wall, the noise-reduction plates are parallelly arranged in the height direction of the middle cylinder at intervals and include left noise-reduction plates and right noise-reduction plates, the right sides of the left noise-reduction plates are staggered with the left sides of the right noise-reduction plates, the distance between the adjacent noise-reduction plates is 1/4-1/3 of the length of the noise-reduction plates, and the length of staggered parts of the left noise-reduction

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plates and the right noise-reduction plates is 1/3-1/2 that of the noise-reduction plates; The lower surfaces of the noise-reduction plates are concave-convex surfaces formed by concave parts and convex parts; The noise-reduction plates are composite plates filled with noise-reduction cotton; and An upper conical cap is mounted on the inner side of the upper cylinder, a lower conical cap is mounted on the inner side of the lower cylinder, and the upper conical cap is symmetrical with the lower conical cap. Furthermore, the noise-reduction plates have a thickness of 4-6mm, and the convex parts protrude out of the lower surfaces by 0.6-1.0mm. Furthermore, the upper conical cap and the lower conical cap have a height of 18-22cm and a conicity (a) of 45-55°. Furthermore, the lower surfaces of the noise-reduction plates are densely formed with noise-reduction holes used for reducing noises. Furthermore, the porous plate is a galvanized plate which is regularly and densely formed with through holes. The through holes have a diameter of 3-4mm, and the distance between the adjacent through holes is 2-3mm. Furthermore, the upper conical cap is fixedly connected to the upper cylinder through bolts and bolt holes matched with the bolts; and The lower conical cap is fixedly connected to the lower cylinder through bolts and bolt holes matched with the bolts. Furthermore, the fixed connection is implemented by four-point fixation. Furthermore, each noise-reduction plate has a side welded to the inner cylinder wall of the middle cylinder. Furthermore, the noise-reduction plates are galvanized metal plates filled with noise-reduction cotton. The utility model has the following beneficial effects:

S p e cifica tio n

1. The cylinder walls of the middle cylinder of the utility model include the inner cylinder wall and the outer cylinder wall, the noise-reduction layer is disposed between the inner cylinder wall and the outer cylinder wall, the noise-reduction plates are parallelly arranged on the middle cylinder in a staggered manner, the upper conical cap is mounted on the inner side of the upper cylinder, and the lower conical cap is mounted on the inner side of the lower cylinder; noises enter the noise reducer via the air inlet, the noises are echoed by the lower conical cap to the middle cylinder, are then echoed to the upper conical cap after being absorbed and reduced by the porous plate. The multiple noise-reduction o plates parallelly arranged in the staggered manner and the noise-reduction layer, and finally are discharged via the air outlet; and in this process, the noise-reduction cotton filled in the noise-reduction plates as well as the concave-convex lower surface of the noise-reduction cotton can improve the noise reduction effect, and particularly, the multiple noise-reduction plates parallelly arranged in the staggered manner can greatly improve the number of times of noise absorption and noise echoing, and the noises can be decreased to 20-30dB from over 100dB by means of repeated echoing and reduction, and the noise reduction effect is satisfactory.

2. The upper conical cap and the lower conical cap are arranged in the noise reducer of the utility model, so that the number of times of noise echoing is increased, noises are absorbed to the maximum extent, and the noise reduction effect is realized;

3. The height and conicity of the upper and lower conical caps of the utility model are reasonably set, so that the air flow will not be hindered, and fans can acquire sufficient air; and the noises can be echoed and reduced to the maximum extent, and the noise reduction effect is good;

4. The lower surfaces of the noise-reduction plates of the utility model are densely formed with noise-reduction holes used for reducing noises, and part of the

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noises enter the noise-reduction cotton via the noise-reduction holes, so that the noise reduction effect is further improved; and

5. The porous plate of the utility model is a galvanized plate, thus being resistant to smoke impacts, high in corrosion resistance, long in-service life and is easy to maintain.

The technical solutions of the utility model are summarized above, can be implemented in accordance with the contents in the specification to be better understood, and will be detailed hereinafter with reference to preferred embodiments of the utility model.

o Brief Description of the Several Views of the Drawings

FIG. 1 is an overall structural view of the utility model;

FIG. 2 is a bottom view of an upper cylinder of the utility model;

Reference signs in the figures: 1, upper cylinder; 2, middle cylinder; 21, outer cylinder wall; 22, inner cylinder wall; 23, noise-reduction layer; 3, lower cylinder; 4, air inlet; 5, air outlet; 6, left noise-reduction plate; 7, right noise-reduction plate; 8, upper conical cap; 9, lower conical cap; 10, bolt; H, height of the upper conical cap and lower conical cap; a: conicity of upper conical cap and lower conical cap.

Detailed Description of the Utility Model

The specific implementations of the utility model are explained below with specific embodiments, and those skilled in the art can easily understand the advantages and effects of the utility model with reference to the contents in the specification. The utility model can also be implemented in other ways, that is, different modifications and alterations can be made without departing from the scope of the utility model. Embodiment: A noise reducer for fans, as shown in FIG. 1 and FIG. 2, comprises an upper cylinder 1, a middle cylinder 2, and a lower cylinder 3,

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wherein the cross-sections of the upper cylinder, the middle cylinder and the lower cylinder are rectangular, an aperture of the upper cylinder becomes smaller gradually from bottom to top, an aperture of the lower cylinder becomes smaller gradually from top to bottom, the lower end of the lower cylinder is connected to an air inlet 4, and the upper end of the upper cylinder is connected to an air outlet

5; Cylinder walls of the middle cylinder include an outer cylinder wall 21 and an inner cylinder wall 22 located on the inner side of the outer cylinder wall, a noise-reduction layer 23 is disposed between the inner cylinder wall and the outer o cylinder wall and has a thickness of 7-9cm, and the inner cylinder wall is a porous plate; Multiple noise-reduction plates are disposed on the inner cylinder wall of the middle cylinder and are perpendicular to the inner cylinder wall, the noise-reduction plates are parallelly arranged in the height direction of the middle cylinder at intervals and include left noise-reduction plates 6 and right noise-reduction plates 7, the right sides of the left noise-reduction plates are staggered with the left sides of the right noise-reduction plates, and the distance between the adjacent noise-reduction plates is 1/4-1/3 of the length of the noise-reduction plates; and the length of staggered parts of the left noise-reduction plates and the right noise-reduction plates are 1/3-1/2 that of the noise-reduction plates; The lower surfaces of the noise-reduction plates are concave-convex surfaces formed by concave parts and convex parts; The noise-reduction plates are composite plates filled with noise-reduction cotton; and An upper conical cap 8 is mounted on the inner side of the upper cylinder, a lower conical cap 9 is mounted on the inner side of the lower cylinder, and the upper conical cap is symmetrical with the lower conical cap.

S p e cifica tio n

In this embodiment, the distance between the adjacent noise-reduction plates and the length of the staggered parts of the left and right noise-reduction plates are set reasonably, so that the air flow will not be hindered to ensure that fans can acquire sufficient air; and noises can be echoed and reduced to the maximum extent, and the noise reduction effect is good. The thickness of the noise-reduction plates is 4-6mm, and the convex parts protrude out of the lower surfaces by 0.6-1.0mm. The height H of the upper conical cap and the lower conical cap is 18-22cm, and the conicity a of the upper conical cap and the lower conical cap is 45-55°. The lower surfaces of the noise-reduction plates are densely formed with noise-reduction holes used for reducing noises. The porous plate is a galvanized plate which is regularly and densely formed with through holes, the diameter of the through holes is 3-4mm, and the distance between the adjacent through holes is 2-3mm. In this embodiment, the upper conical cap is fixedly connected to the upper cylinder through bolts 10 and bolt holes matched with the bolts; The lower conical cap is fixedly connected to the lower cylinder through bolts 10 and bolt holes matched with the bolts or in other manners, for example, by welding one end of each bolt to the upper conical cap (lower conical cap) and the other end of each bolt to the upper cylinder (lower cylinder). In this embodiment, the fixed connection is implemented by four-point fixation. One side of each noise-reduction plate is welded to the inner cylinder wall of the middle cylinder. The noise-reduction plates are galvanized metal plates filled with noise-reduction cotton. In this embodiment, the height of the upper conical cap and the lower conical cap is preferably 20cm, and the conicity of the upper conical cap and the lower

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conical cap is preferably 450. The operating principle and process of the utility model are as follows: The noise reducer is mounted at an air outlet of a fan; when the fan operates, air in the fan passes through the air inlet of the noise reducer, noises enter the noise reducer via the air inlet, the noises are echoed by the lower conical cap to the middle cylinder, are then echoed to the upper conical cap after being absorbed and reduced by the porous plate, the multiple noise-reduction plates parallelly arranged in the staggered manner and the noise-reduction layer, and finally are discharged via the air outlet. In this process, the noise-reduction cotton filled in the o noise-reduction plates as well as the concave-convex lower surface of the noise-reduction cotton can improve the noise reduction effect, and particularly, the multiple noise-reduction plates parallelly arranged in the staggered manner can greatly improve the number of times of noise absorption and noise echoing, and the noises can be decreased to 20-30dB from over 100dB by means of repeated echoing and reduction, and the noise reduction effect is satisfactory. The above embodiments are merely preferred ones of the utility model, and are not intended to limit the patent scope of the utility model. Any equivalent structural transformations obtained on the basis of the contents of the specification and accompanying drawings of the utility model, or direct or indirect application to other relating technical fields should also fall within the patent protection scope of the utility model.

C 1a i m s

1. A noise reducer for fans, comprising an upper cylinder (1), a middle cylinder (2), and a lower cylinder (3), wherein cross-sections of the upper cylinder, the middle cylinder and the lower cylinder are rectangular, an aperture of the upper cylinder become smaller gradually from bottom to top, an aperture of the lower cylinder becomes smaller gradually from top to bottom, a lower end of the lower cylinder is connected to an air inlet (4), and an upper end of the upper cylinder is connected to an air outlet (5): cylinder walls of the middle cylinder include an outer wall cylinder (21) and an inner wall cylinder (22) located on an inner side of the outer cylinder wall, a o noise-reduction layer (23) is disposed between the inner cylinder wall and the outer cylinder wall and has a thickness of 7-9cm, and the inner cylinder wall is a porous plate; multiple noise-reduction plates are arranged on the inner cylinder wall of the middle cylinder and are perpendicular to the inner cylinder wall. The noise-reduction plates are parallelly arranged in a height direction of the middle cylinder at intervals and include left noise-reduction plates (6) and right noise-reduction plates (7), right sides of the left noise-reduction plates are staggered with left sides of the right noise-reduction plates, a distance between the adjacent noise-reduction plates is 1/4-1/3 of a length of the noise-reduction plates, a length of staggered parts of the left noise-reduction plates and the right noise-reduction plates are 1/3-1/2 that of the noise-reduction plates; lower surfaces of the noise-reduction plates are concave-convex surfaces formed by concave parts and convex parts; the noise-reduction plates are composite plates filled with noise-reduction cotton; and an upper conical cap (8) is mounted on an inner side of the upper cylinder, a lower conical cap (9) is mounted on an inner side of the lower cylinder, and the upper conical cap is symmetrical with the lower conical cap.

Claims

C 1 a i m s
2. The noise reducer for fans according to Claim 1, wherein the noise-reduction plates have a thickness of 4-6mm, and the convex parts protrude out of the lower surfaces by 0.6-1.0mm.
3. The noise reducer for fans according to Claim 1, wherein the upper conical cap and the lower conical cap have a height (H) of 18-22cm and a conicity (a) of 45-550.
4. The noise reducer for fans according to Claim 1, wherein the lower surfaces of the noise-reduction plates are densely formed with noise-reduction holes used for reducing noises. o
5. The noise reducer for fans according to Claim 1, wherein the porous plate is a galvanized plate which is regularly and densely formed with through holes, the through holes have a diameter of 3-4mm, and a distance between the adjacent through holes is 2-3mm.
6. The noise reducer for fans according to Claim 1, wherein the upper conical cap is fixedly connected to the upper cylinder through bolts (10) and bolt holes matched with the bolts; and the lower conical cap is fixedly connected to the lower cylinder through bolts (10) and bolt holes matched with the bolts.
7. The noise reducer for fans according to Claim 6, wherein the fixed connection is implemented by a four-point fixation.
8. The noise reducer for fans according to Claim 1, wherein each said noise-reduction plate has a side welded to the inner cylinder wall of the middle cylinder.
9. The noise reducer for fans according to Claim 1, wherein the noise-reduction plates are galvanized metal plates filled with noise-reduction cotton.

Drawings Attached to the Specification 02 Jul 2020 2020102294

FIG. 1

1/2

Drawings Attached to the Specification 02 Jul 2020 2020102294

FIG. 2

2/2