CN220400222U

CN220400222U - Array type hollow chimney muffler

Info

Publication number: CN220400222U
Application number: CN202321743255.8U
Authority: CN
Inventors: 荀淮娣; 戴晓波; 郭宝; 尤坤运; 杜乐
Original assignee: Shanghai Environmental Protection Co ltd
Current assignee: Shanghai Environmental Protection Co ltd
Priority date: 2023-07-05
Filing date: 2023-07-05
Publication date: 2024-01-26
Anticipated expiration: 2033-07-05

Abstract

The utility model belongs to the technical field of noise control, and relates to a muffler for a chimney. The utility model provides an array type hollow chimney muffler, which comprises a muffler outer guard plate, a muffler column and a steel pipe; the outer guard plate of the muffler forms the periphery of the array type hollow chimney muffler, a plurality of steel pipes are fixed in the outer guard plate of the muffler, and each steel pipe is fixed with a plurality of silencing posts; the silencing posts are hollow, and the axes of the silencing posts are arranged in parallel along the airflow direction; the axis of the steel pipe is perpendicular to the axis of the silencing column, and the axis of the silencing column is consistent with the axis direction of a channel surrounded by the outer guard plate of the silencer. The noise of the chimney is reduced under the condition that the exhaust performance of the chimney is not affected, the regeneration noise is low, and the pressure loss is low; and compared with the traditional solid muffler, the hollow muffler is lighter in overall material load bearing and high in safety performance.

Description

Array type hollow chimney muffler

Technical Field

The utility model belongs to the technical field of noise control, and relates to a muffler, in particular to a muffler for a chimney.

Background

A chimney is a structure for providing ventilation for hot flue gas or smoke of a boiler, furnace or fireplace, and is increasingly used with the rapid development of the modern industry.

The noise value of the boiler exceeds 90dB, the frequency is mainly concentrated in the range of 1000-4000 Hz, wherein the 1000-2000Hz frequency noise is mainly from high-power rotating machinery such as a boiler induced draft fan, a water supply pump and the like, and the 4000Hz frequency noise is from steam disturbance and air exhaust purging in a steam pipeline. In the chimney of the air outlet of the boiler, the aerodynamic noise caused by the interaction of dynamic air and static air is up to 100-110dB because the air flow in the boiler flows at high speed at the air outlet of the chimney. Because of the environmental protection requirement, the arrangement of the exhaust chimney must meet the index of a certain height, therefore, the height of the chimney is generally higher, which causes the characteristics of high position and large noise of the exhaust chimney, and the noise is shielded by other structures, so that the shielding effect is very small, the propagation distance is long, the radiation influence range is wide, and the noise source type with very large harm of noise pollution is provided.

Although the traditional muffler can effectively reduce noise, the exhaust performance of a chimney is affected to a certain extent, and the muffler is easy to erode and age due to the large flow velocity, and is slowly damaged from inside to outside, so that the service life is short, and the safety performance is low.

Disclosure of Invention

The utility model aims to solve the technical problem of improving the silencing equipment of the chimney, reducing the noise of the chimney under the condition of not influencing the exhaust performance of the chimney as much as possible, and further prolonging the service life of the silencing equipment of the chimney.

The utility model provides an array type hollow chimney muffler, which is a ventilating muffler device with a prolonged service life due to the fact that a muffler array is compounded in impedance, wherein a muffler column filled with sound absorbing materials is mainly arranged in a muffler channel, the muffler column is fixedly arranged in a ventilating duct through a steel pipe bracket and is arranged in parallel along the airflow direction along the axis.

The utility model relates to an array type hollow chimney muffler, which comprises a muffler outer guard plate 1, a muffler column 5 and a steel pipe 4; the muffler outer guard plate 1 forms the periphery of an array hollow chimney muffler, a plurality of steel pipes 4 are fixed in the muffler outer guard plate 1, and each steel pipe 4 is fixed with a plurality of muffler columns 5; the silencing posts 5 are hollow and the axes of the silencing posts 5 are arranged in parallel along the air flow direction; the axis of the steel pipe 4 is perpendicular to the axis of the silencing post 5, and the axis of the silencing post 5 is consistent with the axis direction of a channel surrounded by the outer guard plate 1 of the silencer.

Preferably, the inner parts of the outer muffler guard plate 1 and the sound-absorbing column 5 are filled with sound-absorbing materials. The inside of the muffler outer panel 1 is a portion surrounded between the outer panel back plate 2 and the outer panel face plate 3, and a triangular mesh portion filled with color is shown in fig. 1. The interior of the sound-deadening column 5 (the portion enclosed between the sound-deadening column inner panel 6 and the sound-deadening column outer panel 7, i.e., the color-filled portion in fig. 1, the solid portion in the drawing) is also filled with sound-absorbing material, but the steel pipe 4 is hollow or hollow. The sound absorbing material is a material with strong sound energy absorbing and noise reducing performances. The sound absorbing material is to be impedance matched to the acoustic characteristics of the surrounding sound transmission medium so that the sound energy enters the sound absorbing material without reflection and so that a substantial portion of the incident sound energy is absorbed. The sound absorbing material of the present utility model may be a conventional sound absorbing material such as mineral wool, glass wool, wood wool sound absorbing board, or the like. In a preferred embodiment of the utility model, the sound absorbing material is 48K superfine glass wool wrapped by hydrophobic glass fiber cloth.

Preferably, the inner space formed by the muffler outer protection plate 1 is designed streamline to realize low air resistance; or, the silencing post 5 is provided with an arc-shaped flow guide tip on the windward side for reducing wind resistance.

Preferably, the thickness of the muffler outer protection plate 1 may be between 80mm and 120mm, increasing according to the noise reduction requirement.

Preferably, the silencing post 5 is welded and fixed inside the outer silencer protecting plate 1 through a steel pipe 4, the array type hollow chimney silencer is welded and fixedly installed through a keel (including but not limited to the steel pipe 4), the thickness of the keel is 2mm, and the array type hollow chimney silencer is formed by folding an aluminum plate. The material of the keels is steel pipes, and the steel pipes are collectively called keels because of the supporting and fixing functions. The welding fixation can reduce noise generated by loose friction among all parts of the array type hollow chimney muffler, and is convenient to manufacture and process.

Preferably, the outer frame of the array type hollow chimney muffler consists of four muffler outer guard plates 1 and a panel, and the panel is detachably connected with the muffler outer guard plates 1; the four muffler outer guard plates 1 are sequentially connected to form a hollow cuboid channel, a plurality of mutually parallel steel pipes 4 are fixed between the two opposite muffler outer guard plates 1, and every two steel pipes 4 form a group; the cross section of the silencing post 5 is rectangular, and two opposite parallel sides of the rectangle are respectively fixed on two steel pipes 4 forming a group.

Preferably, the muffler outer protection plate 1 is provided with a plurality of steel pipes 4 along the axis of the channel, and the muffler column 5 is fixedly arranged in the space surrounded by the muffler outer protection plate 1 through the steel pipes 4.

Preferably, the array type hollow chimney muffler is made of aluminum materials. In a preferred embodiment of the utility model, the muffler outer guard plate 1 is an aluminum plate with the diameter of 1.5mm, the panel of the array type hollow chimney muffler is a perforated aluminum plate with the diameter of 1.5mm, the periphery of the internal muffler column 5 is a perforated aluminum plate with the diameter of 1.2mm, the perforation hole diameters of all perforated plates are less than or equal to phi 2.5, and the perforation rate is 20% -30%.

Preferably, the perforated aluminum sheets are referred to as panels, and the panels are distinguished from the outer panels in that the panels are perforated to absorb sound and the outer panels are conventional aluminum sheets without perforations. Sound absorption by perforated panels: the perforated panel surface has numerous fine pores, and when an acoustic wave is incident on the panel surface, a part of the acoustic wave is reflected off the panel surface, and another part of the acoustic wave penetrates into the panel to be absorbed into the sound absorbing material (namely 48K ultrafine glass wool, a filling part in the figure). The sound absorbing material has numerous fine pores, and when sound waves propagate in the sound absorbing material, two mechanisms mainly cause attenuation of the sound waves (namely noise attenuation): (1) the air in the small holes or gaps of the material is moved due to vibration generated by sound waves, friction is caused between the small holes or gaps of the material and the hole wall, the air close to the hole wall and the surface of the fiber is not easy to move due to the influence of the hole wall, and a considerable part of sound energy is converted into heat energy due to the action of friction and viscous force, so that the sound waves are attenuated, and reflected sound is attenuated to achieve the purpose of sound absorption: (2) the heat loss caused by the heat exchange between the air in the pores and the walls of the pores and the fibers also attenuates the acoustic energy.

Preferably, the steel pipe 4 is a rectangular steel pipe, the length of the long side of the rectangular steel pipe is the same as the distance between the two parallel opposite muffler outer protection plates 1, and the short side of the rectangular steel pipe is fixed on the muffler outer protection plates 1.

Preferably, the array type hollow chimney muffler is mounted on a ventilation duct.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "several" and "a plurality" means two or more, unless specifically defined otherwise.

The beneficial effects of the utility model include:

the three-face sound absorbing material ((1) the panel of the outer guard plate of the muffler (2) the outer panel of the muffler column (3) the inner panel of the muffler column) has high efficient noise elimination performance, so that the overall insertion loss of the muffler is high, the regeneration noise is low and the pressure loss is low;

the flow guiding tip and the silencing column in the same direction with the flow velocity of the air outlet enable the overall resistance of the silencer to be smaller, and the overall ventilation performance of the original chimney is not affected;

according to the installation conditions, noise reduction requirements, sound source frequency harmonic characteristics, customs resistance and other factors, materials of different types and distances of the noise elimination channels can be adopted, so that the effect of unused noise reduction is achieved;

4. compared with the traditional solid muffler, the hollow muffler is lighter in overall material load bearing and high in safety performance.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that, for some embodiments of the present application, each drawing in the following description may be further obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a windward plan view of a chimney muffler.

FIG. 2 is a cross-sectional view A-A.

Fig. 3 is a plan view of the air outlet face of the chimney muffler.

Wherein the reference numerals are as follows: 1-a muffler outer guard plate; 2-an outer guard plate backboard; 3-an outer panel; 4-steel pipes, which may also be referred to as keels; 5-a sound elimination column; 6-silencing an inner column panel; 7-silencing an outer column panel; 8-the windward side of the silencing column is provided with a diversion tip.

Detailed Description

The technical solutions will be clearly and completely described below by means of embodiments of the present application, it being apparent that the described embodiments are only some of the preferred embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the inventors, are within the scope of the present application based on the embodiments herein.

As shown in fig. 1 to 3, the outside of the array type hollow chimney muffler of the utility model is a quadrangle surrounded by a muffler outer guard plate 1, and a row of steel pipes 4 are welded and fixed in the muffler outer guard plate 1. In the preferred embodiment, the steel pipe 4 is a rectangular steel pipe, the length of the long side of the rectangular steel pipe is the same as the distance between two parallel and opposite muffler outer shields 1, and the short side of the rectangular steel pipe is fixed to the muffler outer shield 1. Two long sides of the rectangular steel pipe are a group, a plurality of silencing posts 5 are fixed on each group, the cross section of each silencing post 5 is rectangular, and two opposite parallel sides of each silencing post 5 are respectively fixed on the two long sides of the rectangular steel pipe.

The array type hollow chimney muffler is arranged in a ventilating duct of a chimney, the muffling column 5 is hollow, and the axes of the muffling column 5 are arranged in parallel along the air flow direction; the silencing posts 5 are fixedly arranged on the ventilating duct through the steel pipe 4 support, are arranged in parallel along the airflow direction by the axis, and are an impedance composite silencer array, and the service life of the silencer array is prolonged due to the fact that the silencer array is in the same direction as the airflow. The axis of the steel pipe 4 is perpendicular to the axis of the silencing post 5, and the axis of the silencing post 5 is consistent with the axis direction of a channel surrounded by the outer guard plate 1 of the silencer.

The chimney exhaust flow velocity is large and is in a moist environment for a long time, in order to achieve the maximization of noise reduction effect, the muffler outer guard plate 1 is an aluminum plate with the thickness of 1.5mm, the panel is a perforated aluminum plate with the thickness of 1.5mm, the four sides of the internal muffler column 5 are all perforated aluminum plates with the thickness of 1.2mm, the perforation aperture of all perforated plates is less than or equal to phi 2.5, and the perforation rate is 20% -30%. The inside of the outer guard plate 1 of the muffler and the inside of the muffling column 5 are filled with 48K superfine glass wool wrapped by hydrophobic glass fiber cloth, a ventilation gap with a certain area is reserved among the muffling columns to ensure enough air flow and good muffling performance, the channel is designed to be streamline so as to realize lower air resistance, lower regeneration noise is ensured, the windward side of the muffling column is designed to be arc-shaped flow guiding tip, and wind resistance is reduced. The silencing post 5 is welded and fixed in the silencing channel through a rectangular steel pipe (namely a keel), the whole structure of the silencer is welded and fixedly installed through the keel, the thickness of the keel is 2mm, and the silencing post is formed by folding an aluminum plate.

The perforated panel surface has numerous fine pores, and when an acoustic wave is incident on the panel surface, a part of the acoustic wave is reflected off the panel surface, and another part of the acoustic wave penetrates into the panel to be absorbed into the sound absorbing material (namely 48K ultrafine glass wool, a filling part in the drawing). The sound absorbing material has numerous fine pores, and when sound waves propagate in the sound absorbing material, two mechanisms mainly cause attenuation of the sound waves (namely noise attenuation): (1) the air in the small holes or gaps of the material is moved due to vibration generated by sound waves, friction is caused between the small holes or gaps of the material and the hole wall, the air close to the hole wall and the surface of the fiber is not easy to move due to the influence of the hole wall, and a considerable part of sound energy is converted into heat energy due to the action of friction and viscous force, so that the sound waves are attenuated, and reflected sound is attenuated to achieve the purpose of sound absorption: (2) the heat loss caused by the heat exchange between the air in the pores and the walls of the pores and the fibers also attenuates the acoustic energy. The array type hollow chimney muffler can reduce by 6-12dB (A) after being used.

The above-described embodiments are merely specific embodiments of the present application, but the scope of protection of the present application is not limited thereto, and any changes or substitutions that can be suggested by one skilled in the art without creative efforts are intended to be included in the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims in the present application.

Claims

1. The array type hollow chimney muffler is characterized by comprising a muffler outer guard plate (1), a muffler column (5) and a steel pipe (4); the outer silencer guard plate (1) forms the periphery of the array type hollow chimney silencer, a plurality of steel pipes (4) are fixed in the outer silencer guard plate (1), and each steel pipe (4) is fixed with a plurality of silencing posts (5);

the silencing columns (5) are hollow, and the axes of the silencing columns (5) are arranged in parallel along the airflow direction; the axis of the steel pipe (4) is perpendicular to the axis of the silencing column (5), and the axis of the silencing column (5) is consistent with the axis direction of a channel surrounded by the outer silencer guard plate (1).

2. The array type hollow chimney muffler as claimed in claim 1, wherein the muffler outer guard plate (1) is formed by enclosing an outer guard plate back plate (2) positioned at the periphery of the muffler outer guard plate (1) and an outer guard plate panel (3) positioned inside the muffler outer guard plate (1) and facing the steel pipe (4);

the silencing post (5) is formed by encircling a silencing post outer panel (7) positioned at the periphery of the silencing post (5) and a silencing post inner panel (6) positioned inside the silencing post (5);

the inner parts of the outer guard plate (1) and/or the silencing column (5) of the silencer are filled with sound absorbing materials.

3. The array type hollow chimney muffler according to claim 2, wherein the sound absorbing material is 48K ultra fine glass wool wrapped with hydrophobic glass fiber cloth.

4. The array-type hollow chimney muffler according to claim 1, characterized in that the inner space formed by the muffler outer plate (1) is designed streamline to achieve low air resistance; or, the windward side of the silencing column (5) is provided with a windward side diversion tip (8) for reducing wind resistance.

5. The array type hollow chimney muffler as claimed in claim 1, wherein the muffler column (5) is welded and fixed inside the muffler outer guard plate (1) through a steel pipe (4), the array type hollow chimney muffler is welded and fixedly installed through a keel, the thickness of the keel is 2mm, and the array type hollow chimney muffler is formed by folding an aluminum plate.

6. The array type hollow chimney muffler as claimed in claim 1, wherein an outer frame of the array type hollow chimney muffler is composed of four muffler outer guard plates (1) and a panel, and the panel is detachably connected to the muffler outer guard plates (1); four muffler outer guard plates (1) are sequentially connected to form a hollow cuboid channel, a plurality of mutually parallel steel pipes (4) are fixed between two opposite muffler outer guard plates (1), and every two steel pipes (4) form a group; the section of the silencing column (5) is rectangular, and two opposite parallel sides of the rectangular are respectively fixed on two steel pipes (4) forming a group; the thickness of the muffler outer protection plate (1) ranges from 80mm to 120mm, and increases gradually according to the noise reduction requirement.

7. The array type hollow chimney muffler as claimed in claim 1, wherein the muffler outer guard plate (1) is provided with a plurality of steel pipes (4) along the axis of the passage, and the muffler column (5) is fixedly arranged in the space surrounded by the muffler outer guard plate (1) through the steel pipes (4).

8. The array type hollow chimney muffler according to claim 1, wherein the muffler outer guard plate (1) is an aluminum plate with the thickness of 1.5mm, the panel of the array type hollow chimney muffler is a perforated aluminum plate with the thickness of 1.5mm, the periphery of the inner muffling post (5) is a perforated aluminum plate with the thickness of 1.2mm, the perforation aperture of all perforated plates is less than or equal to phi 2.5, and the perforation rate is 20% -30%.

9. The array type hollow chimney muffler as claimed in claim 1, wherein the steel pipe (4) is a rectangular steel pipe, the length of the long side of the rectangular steel pipe is the same as the distance between two parallel opposite muffler outer guard plates (1), and the short side of the rectangular steel pipe is fixed on the muffler outer guard plates (1).

10. The array type hollow chimney muffler according to any one of claims 1 to 9, wherein the array type hollow chimney muffler is mounted on a chimney ventilation duct.