Drop-shaped array type silencer

Abstract

The utility model discloses a water-drop-shaped array type silencer which comprises a silencer shell (10), a sound absorber array composed of a plurality of sound absorber units (20) and 1 / 2 sound absorber units (30) is arranged in the shell, the whole sound absorber units (20) are in a falling water drop shape, and therefore a long and narrow ventilation path with the front portion thin and the rear portion thick is formed between the adjacent sound absorber units. According to the water-drop-shaped array type silencer, the silencing performance and the aerodynamic performance can be both considered.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental noise, in particular to a water-drop-shaped array muffler. Background Art

[0002] In recent years, in order to prevent and control environmental noise pollution, protect and improve the production and living environment of the people, the prevention and control efforts of environmental noise pollution have been continuously increased, and many noise prevention and control technical means have been developed, which have promoted the industrial development and product innovation in the field of noise control; the muffler is one of such products, which is a noise elimination device with an air flow channel that can effectively reduce noise. The array muffler is a new type of noise reduction device designed and developed based on its application in noise control projects for many years. It is widely used in muffler systems such as subways, power plants, ships, and building air ducts, and has the characteristics of strong noise elimination ability, saving storage space, convenient transportation, light handling, and simple installation. The sound absorbers of the array muffler can be flexibly adjusted longitudinally and transversely, which can effectively improve the noise reduction effect in the low-frequency and high-frequency bands and reduce the resistance loss of the system.

[0003] A muffler is a noise elimination device with an air flow channel that can effectively reduce noise, and it has two major indicators: noise elimination performance and ventilation performance. The ventilation performance, that is, the aerodynamic performance, is one of the important indicators for evaluating the performance of the muffler and is an important indicator factor that should be considered first in the design of the muffler. However, it is difficult to have both good noise elimination performance and aerodynamic performance. When a large amount of noise reduction is achieved in a traditional muffler, usually a greater resistance loss has to be incurred, and vice versa. The array muffler can maximize the ventilation performance of the muffler. However, whether it is a circular noise elimination unit or a square sound absorption unit, generally the upper and lower spacing and the left and right spacing are positioned, but the spacing in the direction of the diagonal sound absorption unit is the square root of the horizontal and vertical spacing. This is also the main reason affecting the noise elimination performance of the muffler.

[0004] Therefore, new technologies and equipment are needed to at least partially solve the defects existing in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a water-drop-shaped array muffler that takes both noise elimination performance and aerodynamic performance into account, so as to overcome the deficiency in noise elimination performance in the prior art.

[0006] In order to have both noise elimination performance and aerodynamic performance at the same time, the utility model adopts the following technical solutions:

[0007] According to one aspect of the present utility model, a water-drop-shaped array muffler is provided, which is characterized in that it includes: a muffler housing (10), and an absorber array composed of a plurality of absorber units (20) is arranged inside the housing. Among them, the absorber unit (20) is integrally in the shape of a falling water drop, so that a long and narrow ventilation path with a narrow front and a wide rear similar to the Bernoulli principle is formed between adjacent absorber units.

[0008] According to an embodiment of the present utility model, the muffler housing (10) is in the shape of a column with openings at both ends, and the absorber array is arranged inside the muffler housing through a transverse connecting rod (11) and a longitudinal support rod (12).

[0009] According to an embodiment of the present utility model, the side wall (101) of the columnar muffler housing is a composite structure, including an outer protective panel, an inner perforated panel, and an absorber layer arranged between the outer layer and the inner layer.

[0010] According to an embodiment of the present utility model, the absorber unit (20) includes an outer perforated panel layer (21). The perforated panel layer (21) is in the shape of a falling water drop, including a semi-circular head (211), an intermediate arc connecting part (212), and a pointed tail (213). The aperture on the perforated panel layer (21) is 2.5 mm to 3 mm, and the perforation rate is 25% to 30%.

[0011] According to an embodiment of the present utility model, the absorber unit (20) further includes a resistive absorber material (22) filled inside, and a non-alkali water-repellent fiberglass cloth is laid flat on the inner side of the perforated panel layer to protect the resistive absorber material.

[0012] According to an embodiment of the present utility model, the absorber unit (20) further includes an inner support plate (23) arranged inside, and the inner support plate (23) is a perforated plate.

[0013] According to an embodiment of the present utility model, the resistive absorber material (22) is centrifugal glass wool, and the bulk density is 16 kg / m3 to 48 kg / m3.

[0014] According to an embodiment of the present utility model, the muffler housing (10) is an assembled structure, including a longitudinal housing plate (101-1) and a transverse housing plate (101-2), and the longitudinal housing plate (101-1) and the transverse housing plate (101-2) are connected by a stepped lap joint.

[0015] According to an embodiment of the present utility model, the absorber unit (20) further includes a support rod (24).

[0016] Based on years of application in noise control projects and combined with the characteristics of the enterprise itself, the present utility model designs and develops a new type of noise elimination and reduction device, which can be widely applied to noise elimination systems such as subways, power plants, ships, and building air ducts. It has the characteristics of strong noise elimination ability, saving storage space, convenient transportation, light handling, and simple installation. In addition, the sound absorbers of the array type muffler can be flexibly adjusted longitudinally and transversely, which can effectively improve the noise reduction effect in the low-frequency and high-frequency bands and reduce the system resistance loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Some specific implementation examples of the present utility model will be described in detail hereinafter with reference to the drawings in an exemplary but non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. The objectives and features of the present utility model will become more apparent in view of the following description in conjunction with the drawings, in which:

[0018] Figure 1 FIG. is a front view structural schematic diagram of a water droplet-shaped array type muffler according to an implementation example of the utility model;

[0019] Figure 2 FIG. is a sectional schematic diagram of the water droplet-shaped array type muffler along the air flow direction according to an implementation example of the utility model;

[0020] Figure 3 FIG. is a structural schematic diagram of a sound absorber unit of the water droplet-shaped array type muffler according to an implementation example of the utility model;

[0021] Figure 4 FIG. is a structural schematic diagram of a sound absorber unit of a 1 / 2 water droplet-shaped array type muffler according to an implementation example of the utility model for increasing high-frequency noise elimination;

[0022] Figure 5 FIG. is a schematic diagram of Bernoulli's principle; and

[0023] Figure 6 FIG. is a schematic diagram of the air flow direction of the water droplet-shaped array type muffler according to an implementation example of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments, but the embodiments or descriptions are not used to limit the protection scope of the present utility model.

[0025] Figure 1 FIG. is a front view structural schematic diagram of a water droplet-shaped array type muffler according to an implementation example of the utility model; Figure 2 FIG. is a sectional schematic diagram of the water droplet-shaped array type muffler along the air flow direction according to an implementation example of the utility model; Figure 3Schematic structural diagram of the sound absorption body unit of the water droplet-shaped array muffler according to the utility model embodiment.

[0026] Referring to the accompanying drawings, the water droplet-shaped array muffler of the embodiment may include a muffler housing 10 and a sound absorption body array composed of a plurality of sound absorption body units 20 disposed within the muffler housing 10, wherein the sound absorption body unit 20 is integrally in the shape of a falling water droplet, thereby forming a narrow ventilation path with a thinner front and thicker rear similar to the Bernoulli principle between adjacent sound absorption body units 20.

[0027] One end of the muffler housing 10 is an air inlet, and the other end is an air outlet. The sound absorption body unit on the air inlet side has a hemispherical cross-section at the bottom of the water droplet, and the cross-section of the sound absorption unit on the air outlet side is the tip of the water droplet. As shown in the figure, the muffler housing 10 is tubular. Taking a rectangular tube as an example, it is surrounded by four side walls 101 on the top, bottom, left, and right, that is, it includes two longitudinal shell plates 101-1 and two transverse shell plates 101-2. The longitudinal shell plates 101-1 and the transverse shell plates 101-2 can be connected by a stepped lap joint 101-3. The structure of each side wall 101 is a composite structure. For example, it can be a conventional outer plate + sound absorption structure + inner plate. The outer plate is a protective panel, the inner plate is a perforated plate, and the middle is a resistive sound absorption material or a special sound insulation structure. More specifically, the protective panel can be an unperforated metal plate, and the perforated plate preferably has a hole diameter of 2.5 mm to 3 mm and a perforation rate of 25% to 30%. The sound absorption structure can be a resistive sound absorption material or a special sound insulation structure, and a non-alkali water-repellent fiberglass cloth is laid flat inside the perforated plate to protect the sound absorption material. In this way, each side wall 101 can achieve a good sound insulation effect.

[0028] As Figure 3 、 Figure 4 shown, the sound absorption body units 20, 30 may include an outer perforated panel layer 21, a resistive sound absorption material 22, an inner support plate 23 disposed inside the perforated panel layer 21, and a support rod 24 that penetrates the sound absorption body unit 20 along the air flow direction.

[0029] The perforated panel layer 21 is integrally in the shape of a falling water droplet, a central axisymmetric body; one end is a hemispherical head 211 at the bottom of the water droplet, the other end is a pointed tail 213 at the top of the water droplet, and the middle part is in an arc transition shape, that is, the middle arc connection part 212. The hole diameter on the perforated panel layer 21 can be 2.5 mm to 3 mm, and the perforation rate can be 25% to 30%. To strengthen its structural strength, a plurality of inner support plates 23 can be provided inside the perforated panel layer 21 as stiffening ribs; the inner support plate 23 can be a perforated circular plate, for example, a galvanized steel plate with a thickness of 1.2 mm can be used. In actual processing, the perforated panel layer 21 can be formed by stamping two perforated protective panels into the shape of a water droplet and then connecting them by butting, and a resistive sound absorption material 22 can be filled inside.

[0030] The resistive sound-absorbing material 22 can, for example, adopt a conventionally known sound-absorbing material, such as centrifugal glass wool, with a bulk density of 16 kg / m3 to 48 kg / m3; and an alkali-free hydrophobic fiberglass cloth can be laid flat on the inner side of the perforated panel layer 21 to protect the sound-absorbing material.

[0031] The support rod 24 runs across the center axis position of the sound-absorbing body unit 20. For example, the support rod 24 can be a round steel bar with threads at both ends, serving as a structure to support the weight of the sound-absorbing body unit and fixedly connect both ends of the sound-absorbing body unit to the longitudinal rod support rod 12.

[0032] Reference Figure 1 and 2 , a transverse connecting rod 11 and a longitudinal support rod 12 are arranged vertically and horizontally in the muffler housing 10. Figure 1 Five longitudinal support rods 12 and one transverse connecting rod 11 are shown in . The specific quantity can also be set according to actual needs. A plurality of sound-absorbing body units are arranged at equal intervals horizontally and vertically in the muffler housing 10. Both ends of the sound-absorbing body unit are connected and supported by the longitudinal support rod 12. The sound-absorbing body unit 20 can be fixed between two adjacent longitudinal support rods 12 through the support rod 24 and the fixing bolt 13. The sound-absorbing body unit 30 is fixed on the inner walls of the muffler housing 10 on the front, back, left, and right sides, so as to be arranged in the muffler housing. For example, the sound-absorbing body unit and the support rod are connected by a round steel support rod passing through the sound-absorbing body unit. The end of the round steel has a thread not less than M6, and is connected by a bolt with a spring washer. Nuts are respectively used for fastening on both sides of the support rod to limit the rotation of the sound-absorbing body unit, and the outer side is fixed in a relaxation mode, such as anti-loosening glue, relaxation gasket, etc. The longitudinal support rod can adopt a rectangular steel pipe. In addition, the spacing of the longitudinal support rods can be arranged according to the spacing of the sound-absorbing body units 20.

[0033] The water-drop-shaped array muffler involved in the present invention belongs to a matrix muffler. It not only meets the flexible adjustment of the matrix muffler in the horizontal and vertical directions, but also the water-drop-shaped sound-absorbing body can effectively improve the noise reduction effect of the muffler, reduce the wind resistance, increase the effective area of the sound-absorbing body, and form a narrow ventilation path with a front-thin-and-back-thick shape similar to the Bernoulli principle between adjacent sound-absorbing body units (see Appendix Figure 5 and Appendix Figure 6 ), which is similar to adding a static pressure box to the muffler and can effectively reduce the airflow noise.

[0034] The sound-absorbing body of the matrix muffler of the present invention can be flexibly adjusted in the horizontal and vertical directions, effectively improving the noise reduction effect in the low-frequency and high-frequency bands and reducing the system resistance loss. In addition, the array muffler of the present invention also has the advantages of simple structure, convenient installation, convenient transportation and storage, and can be applied to the noise control of rail transit, power plants, ships, and commercial engineering construction projects.

[0035] The above has described the present utility model through specific embodiments, but the present utility model is not limited to these specific embodiments. Those skilled in the art should understand that various modifications, equivalent replacements, changes, etc. can be made to the present utility model, and as long as these transformations do not deviate from the spirit of the present utility model, they should all be within the protection scope of the present utility model. In addition, the "one embodiment" mentioned above in multiple places represents different embodiments, and of course, all or part of them can also be combined in one embodiment.

Claims

1. A water drop array muffler, characterized in that: The water drop-shaped array silencer comprises a silencer shell (10), in which a sound absorber array composed of a plurality of sound absorber units (20) is arranged, wherein the sound absorber units (20) are in the shape of falling water drops as a whole, thereby forming a narrow ventilation path between adjacent sound absorber units that is thin at the front and thick at the back similar to the Bernoulli principle.

2. The water drop array muffler according to claim 1, characterized in that: The muffler shell (10) is in the shape of a column with openings at both ends, and the sound absorber array is arranged inside the muffler shell via a transverse connecting rod (11) and a longitudinal support rod (12).

3. The water drop array muffler according to claim 2, characterized in that: The side wall (101) of the columnar muffler shell is a composite structure, comprising an outer protective plate, an inner perforated plate and a sound absorbing layer arranged between the outer layer and the inner layer.

4. The water drop array muffler according to claim 1, characterized in that: The sound absorbing unit (20) comprises an outer perforated panel layer (21), the perforated panel layer (21) is in the shape of a falling water drop, comprising a semicircular head (211), a middle arc connecting portion (212) and a pointed tail (213), the aperture of the perforated panel layer (21) is 2.5 mm to 3 mm, and the perforation rate is 25% to 30%.

5. The water drop array muffler according to claim 4, characterized in that: The sound absorbing body unit (20) also includes a resistive sound absorbing material (22) filled inside, and an alkali-free hydrophobic glass cloth is laid on the inner side of the perforated panel layer to protect the resistive sound absorbing material.

6. The water drop array muffler according to claim 4, characterized in that: The sound absorbing body unit (20) further comprises an inner supporting plate (23) arranged inside, and the inner supporting plate (23) is a perforated plate.

7. The water drop array muffler according to claim 5, characterized in that: The resistive sound absorbing material (22) is centrifugal glass wool with a bulk density of 16 kg / m3 to 48 kg / m3.

8. The water drop array muffler according to claim 1, characterized in that: The muffler shell (10) is an assembled structure, comprising a longitudinal shell plate (101-1) and a transverse shell plate (101-2), wherein the longitudinal shell plate (101-1) and the transverse shell plate (101-2) are connected by a step-type overlapping interface (101-3).

9. The water drop array muffler according to claim 4, characterized in that: The sound absorber unit (20) further comprises a support rod (24).

10. The water drop array muffler according to claim 9, characterized in that: The sound absorbing unit (20) is arranged in the muffler housing via a support rod (24) and a fixing bolt (13).

Images