CN105864109B - A muffler for the air inlet of an axial flow fan - Google Patents

Abstract

The invention provides a muffler for the air inlet of an axial flow fan, the overall structure of which is a cylinder connected with the air inlet of the fan, including: a shell (1), a flange (2), a central muffler (3) and several Noise-absorbing and diverting plug-in (4); the front plate of the housing (1) is circular, with a round hole in the middle, and the flange (2) is installed on the round hole for connecting with the air inlet of the fan. blue connection; the back plate of the housing (1) is a circular solid plate; the cylindrical side wall of the housing (1) is evenly provided with several rectangular air inlets; the housing (1) A cavity is formed inside, and in the cavity, the muffler cylinder (3) is arranged on the rear plate of the housing (1); several muffler guides are evenly distributed around the muffler cylinder (3). The upper arc surface of the flow insert (4) is tangent to the circumference of the air inlet of the fan, and the lower arc surface forms an air inlet channel with the upper arc surface of another adjacent sound-absorbing flow guiding insert (4).

Description

A muffler for the air inlet of an axial flow fan

technical field

The invention relates to the field of muffler equipment, in particular to a muffler for an air inlet of an axial flow fan.

Background technique

In recent years, with the rapid development of social economy, noise pollution has attracted more and more attention. Working in an industrial place with high noise for a long time will cause symptoms such as auditory fatigue, headache, tinnitus, and even loss of hearing in severe cases. Therefore, noise control in industrial places is becoming more and more important.

At present, the axial flow fan is noisy, the wind speed is fast, and there are few noise reduction solutions. It is generally used to add a noise reduction device at the inlet. The noise reduction device has problems such as bulky, difficult to fix, large flow resistance, and difficult to achieve the noise reduction effect.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of large volume, difficult fixing, and difficult to meet the requirements of the noise reduction effect of the current axial flow fan air inlet muffler, and to design an axial flow fan inlet with small volume, simple structure and remarkable noise reduction effect. Air muffler.

In order to achieve the above object, the present invention provides a muffler for the air inlet of an axial flow fan. The guide insert 4; the front plate of the housing 1 is circular, with a round hole in the middle, and the flange 2 is installed on the round hole for flange connection with the air inlet of the fan; the housing 1 The rear plate is a circular solid plate; several rectangular air inlets are uniformly arranged on the cylindrical side wall of the housing 1; a cavity is formed inside the housing 1, and in the cavity, the housing 1. The muffler tube 3 is provided on the rear plate; the tube is filled with muffler cotton; several muffler guide inserts 4 are evenly distributed around the muffler tube 3, and the muffler guide inserts 4 The material is a perforated plate, its upper arc surface is tangent to the circumference of the air inlet of the fan, and its lower arc surface forms an air inlet channel with the upper arc surface of another adjacent sound-absorbing and guiding insert 4 .

In the above technical solution, a cavity is formed between the upper arc surface and the lower arc surface of the sound-absorbing flow guide insert 4 and the contacting shell 1, and an inserting plate 5 is arranged in the cavity along the longitudinal direction of the entire device, and the The cavity is divided into two parts, which are used to increase the sound insulation effect and reduce sound radiation; the insert plate 5 is a solid plate; the sound-absorbing cotton 6 is filled in the entire cavity of the sound-absorbing and guiding insert 4 .

In the above technical solution, the number of the sound-absorbing flow-guiding inserts 4 is ten.

In the above technical solution, the thickness of the sound-absorbing cotton 6 in the plurality of sound-absorbing guide inserts 4 is gradually reduced to increase the width of the sound-absorbing frequency band.

In the above technical solution, the axial height of the casing 1 is 500mm.

In the above technical solution, the material of the housing 1 is a high-density sound insulation material, and a sound insulation damping plate is pasted on its inner surface to increase the sound insulation.

In the above technical solution, the sum of the areas of all the rectangular air inlets on the cylindrical side wall of the casing 1 is greater than twice the diameter of the air inlet of the fan.

In the above technical solution, the material of the flange 2 is a high-density sound insulation material.

In the above technical solution, the diameter of the muffler cylinder 3 is half of the diameter of the air inlet of the fan, and the material is a perforated plate.

In the above technical solution, the inner wall of the rear panel of the housing 1 is provided with a sound-absorbing layer for directly absorbing the noise radiated by the fan.

The advantages of the present invention are:

1. The muffler of the present invention can effectively muffle and insulate the air inlet of the fan through the cooperation of the muffler guide insert and the central muffler cylinder, preventing noise radiation;

2. The noise-eliminating and diverting plug-in of the present invention can increase the length of the muffler channel while guiding the flow, and at the same time, the partition installed inside the plug-in can effectively insulate the sound and prevent sound from radiating to the outside; moreover, the streamlined structure of the noise-eliminating and diverting plug-in Can effectively reduce wind resistance;

3. The muffler of the present invention has the characteristics of simple structure, convenient processing and remarkable noise reduction effect.

Description of drawings

Fig. 1 is the structural representation of air inlet muffler of the present invention;

Fig. 2 is the radial sectional view of air inlet muffler of the present invention;

Fig. 3 is an axial sectional view of the air inlet muffler of the present invention.

Drawing logo:

1. Housing 2. Flange 3. Muffler

4. Noise elimination and diversion plug-in 5. Plug-in plate 6. Sound-absorbing cotton

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a muffler for the air inlet of an axial flow fan has an overall structure of a cylinder connected to the air inlet of the fan, including: a shell 1, a flange 2, a muffler cylinder 3 and several muffler guide inserts 4. The front plate of the housing 1 is circular, with a round hole in the middle, and the flange 2 is installed on the round hole for connecting with the flange of the air inlet of the fan; the rear plate of the housing 1 It is a circular solid plate; several rectangular air inlets are uniformly arranged on the cylindrical side wall of the housing 1; a cavity is formed inside the housing 1, and in the cavity, the rear plate of the housing 1 The muffler tube 3 is provided on the top; the muffler cotton is filled in the tube; several guide inserts 4 are uniformly distributed around the muffler tube 3, and the material of the muffler guide insert 4 is a perforated plate, Its upper arc surface is tangent to the circumference of the air inlet of the fan, and its lower arc surface forms an air inlet passage with the upper arc surface of another adjacent sound-absorbing and guiding insert 4 .

As shown in Figure 2, a cavity is formed between the upper arc surface, the lower arc surface and the contacting shell 1 of the sound-absorbing flow guide insert 4, and a flashboard 5 is arranged in the cavity along the longitudinal direction of the entire device. Dividing the cavity into two parts is used to increase the sound insulation effect and reduce the sound radiation; the insert plate 5 is a solid plate; the sound-absorbing cotton 6 is filled in the entire cavity of the sound-absorbing and guiding insert 4 .

Preferably, the number of the sound-absorbing flow guiding inserts 4 is ten.

The thickness of the sound-absorbing cotton 6 in the plurality of sound-absorbing guide inserts 4 gradually decreases to increase the width of the sound-absorbing frequency band.

As shown in FIG. 3 , the diameter of the muffler cylinder 3 is half the diameter of the air inlet of the fan, and the material is a perforated plate.

Preferably, the axial height of the casing 1 is 500mm.

The material of the housing 1 is a high-density sound insulation material, and a sound insulation damping plate is pasted on its inner surface to increase the sound insulation.

The sum of the areas of all the rectangular air inlets on the cylindrical side wall of the casing 1 is greater than twice the diameter of the air inlet of the fan.

The material of the flange 2 is a high-density sound insulation material.

The inner wall of the rear panel of the housing 1 is provided with a sound-absorbing layer for directly absorbing fan radiation noise.

Claims (9)

1. A muffler for the air inlet of an axial flow fan, the overall structure of which is a cylinder connected to the air inlet of the fan, including: a housing (1), a flange (2), a central muffler cylinder (3) and several mufflers The guide plug (4); it is characterized in that the front plate of the housing (1) is circular, and a round hole is opened in the middle, and the flange (2) is installed on the round hole for connecting with the air inlet of the fan flange connection; the back plate of the housing (1) is a circular solid plate; the cylindrical side wall of the housing (1) is evenly provided with several rectangular air inlets; the housing (1) ) forms a cavity inside, and in the cavity, the muffler cylinder (3) is provided on the rear plate of the housing (1); the muffler cotton is filled in the cylinder; in the muffler cylinder (3) There are several sound-absorbing flow guide inserts (4) evenly distributed around, and the material of the sound-absorbing flow guide inserts (4) is a perforated plate, and its upper arc surface is tangent to the circumference of the air inlet of the fan, and its lower arc surface is tangent to the circumference of the fan air inlet. The upper arc surface of another adjacent noise-elimination guide insert (4) constitutes the air inlet channel; the upper arc surface, the lower arc surface of the noise-elimination guide insert (4) and the contacting housing (1) form a A cavity, inside the cavity is provided with an inserting plate (5) along the longitudinal direction of the whole device, which divides the cavity into two parts for increasing the sound insulation effect and reducing sound radiation; the inserting plate (5) is a solid plate ; The sound-absorbing cotton (6) is filled in the whole cavity of the sound-absorbing guide insert (4). 2 . The muffler for the air inlet of an axial fan according to claim 1 , wherein the number of the muffler guide inserts ( 4 ) is 10. 3 . 3. The muffler for the air inlet of an axial flow fan according to claim 2, characterized in that, the thickness of the sound-absorbing cotton (6) in the plurality of sound-absorbing guide inserts (4) gradually decreases, for increasing the The width of the sound absorption band. 4. The muffler for the air inlet of an axial flow fan according to claim 1, characterized in that the axial height of the housing (1) is 500 mm. 5. The muffler for the air inlet of an axial flow fan according to claim 1, wherein the material of the housing (1) is a high-density sound insulation material, and a sound insulation damping plate is pasted on its inner surface for increasing the insulation volume. 6. The muffler for the air inlet of an axial flow fan according to claim 1, wherein the sum of the areas of all the rectangular air inlets on the cylindrical side wall of the casing (1) is greater than twice the diameter of the air inlet of the fan . 7. The muffler for the air inlet of an axial flow fan according to claim 1, characterized in that, the material of the flange (2) is a high-density sound insulation material. 8. The muffler for the air inlet of an axial fan according to claim 1, characterized in that the diameter of the muffler cylinder (3) is half of the diameter of the air inlet of the fan, and the material is a perforated plate. 9. The muffler for the air inlet of an axial flow fan according to claim 1, characterized in that, the inner wall of the rear plate of the housing (1) is provided with a sound-absorbing layer for directly absorbing fan radiated noise.