CN205810375U - A kind of microperforated panel acoustic filter - Google Patents

Abstract

The utility model relates to an airflow muffler, and specifically provides a micro-perforated plate muffler with higher structural strength and sound-absorbing performance: it includes a shell, a micro-perforated plate and a honeycomb core; the shell is provided with a micro-perforated plate, and the A closed cavity is formed between the micro-perforated plate and the shell, and a honeycomb core is filled in the closed cavity, and the honeycomb core is fixedly connected with the shell and the micro-perforated plate. The utility model uses the honeycomb core to separate the large cavity formed by the micro-perforated plate and the shell into several small cavities, thereby improving the noise reduction performance of the muffler. Adding a honeycomb core to the cavity formed by the micro-perforated plate and the shell can significantly improve the structural strength, prevent the internal micro-perforated plate from vibrating under the action of high-speed and high-pressure airflow, and can also improve the sound insulation performance of the shell. In the micro-perforated plate muffler of the utility model, the cavity thicknesses of the upper and lower surfaces of the shell can be inconsistent, thereby widening the sound absorption bandwidth of the muffler.

Description

A micro perforated plate muffler

technical field

The utility model relates to an airflow muffler, in particular to a micro-perforated plate muffler with higher structural strength and muffler performance.

Background technique

The sound-absorbing structure of the micro-perforated plate has the characteristics of good low-frequency sound-absorbing performance, wide-band sound-absorbing frequency, no need to fill any porous sound-absorbing materials, light weight, excellent fireproof, moisture-proof and anti-corrosion performance, etc., and has been considered as the sound-absorbing structure with the most development potential in the future structure. The micro-perforated plate muffler is made of micro-perforated plate sound-absorbing structure, and has been widely used in occasions with high requirements for middle and low frequency noise reduction performance, high requirements for cleanliness, and special requirements for temperature, humidity, and pressure. At present, there is still a large gap between the muffler performance of the micro-perforated plate muffler and the muffler made of traditional resistive sound-absorbing materials, especially in the middle and high frequency bands. It is a major difficulty to further improve the muffler performance of the micro-perforated plate muffler.

The utility model with the application number 201320539150.0 discloses a micro-perforated plate muffler, which includes an inner micro-perforated plate and an outer micro-perforated plate, the inner micro-perforated plate and the outer micro-perforated plate are cylindrical, and the inner micro-perforated plate It is arranged concentrically with the outer micro-perforated plate, a resonance chamber is formed between the inner micro-perforated plate and the outer micro-perforated plate, and an air layer with a length of 5-20 cm is left at the rear of the inner micro-perforated plate. In this technical solution, the micro-perforated plate and the shell are only connected by the two ends of the micro-perforated plate, and the structural strength is relatively poor. The scheme increases the weight of the structure and increases the difficulty of manufacturing the product.

The utility model with the application number 200920029579.9 discloses a corrugated micro-perforated plate muffler, which uses corrugated micro-perforated plates of different specifications with a wavelength of 4cm to 400cm and a peak height of 2cm to 200cm to replace the flat micro-perforated inside the traditional micro-perforated plate muffler plate. This technical solution processes the micro-perforated plate into a corrugated shape, which increases the contact area between the sound wave and the micro-perforated plate, changes the incident angle of the sound wave, and can improve the sound absorption performance, but at the same time deteriorates the aerodynamic performance, especially under high-speed airflow. Resistance will increase more.

Utility model content

(1) Technical problems to be solved

The purpose of the utility model is to provide a micro-perforated plate muffler to solve the problems of the existing micro-perforated plate muffler with low internal structural strength and low noise reduction.

(2) Technical solution

In order to solve the above technical problems, the utility model provides a micro-perforated plate muffler, the micro-perforated plate muffler includes a shell, a micro-perforated plate and a honeycomb core; A closed cavity is formed between the bodies, the closed cavity is filled with a honeycomb core, and the honeycomb core is fixedly connected with the shell and the micro-perforated plate.

The honeycomb core divides the large cavity formed between the micro-perforated plate and the shell into several small cavities, thereby improving the noise reduction performance of the muffler. Moreover, the honeycomb core connects and fixes the micro-perforated plate and the housing, which significantly improves the structural strength of the muffler, prevents the internal micro-perforated plate from vibrating under the action of high-speed and high-pressure airflow, and improves the sound insulation performance of the housing.

Preferably, the honeycomb core is fixed with the shell and the micro-perforated plate by bonding, for example, by bonding and fixing with an adhesive.

Further, in order to better realize the sound-absorbing performance of the closed cavity and improve the mechanical properties of the glued fixation, it is preferable that the thickness of the closed cavity formed by the micro-perforated plate and the shell is 20mm-500mm.

It should be noted that the micro-perforated plate can be set according to the shape of the shell, for example, when the shell is a tubular structure, the micro-perforated plate is concentric with the shell, and the cross-sectional shape is circular.

However, the utility model provides a preferred solution, that is, the cross-sectional shape of the housing and the micro-perforated plate is rectangular. At this time, as shown in Figure 2, the closed cavity formed by the micro-perforated plate and the housing will be in the shape of Surrounded by four sides (upper, lower, left and right sides respectively), the four corners of the closed cavity are not filled with the aforementioned honeycomb core. The thickness of the four sides of the closed cavity may be the same or different. In a specific embodiment, the thickness of the lower side of the closed cavity is 100 mm, and the thickness of the other three sides is 50 mm.

Further, according to actual needs, a sound-absorbing sheet can be provided in the ventilation channel formed by the micro-perforated plate, the axial direction of the sound-absorbing sheet is consistent with the axial direction of the ventilation channel, and the two sides of the sound-absorbing sheet are aligned with the The micro-perforated plate is fixedly connected, and the two ends of the sound-absorbing sheet are provided with diversion sections, which are triangular or arc-shaped.

The general way of the fixed connection is that when installing the sound-absorbing sheet, a keel is arranged inside the shell, and the sound-absorbing sheet is fixed on the keel. In addition, fixed connections such as welding or gluing are also acceptable.

Further, since the function of the guide section of the muffler is to guide high-speed and high-pressure airflow, the surface material of the guide section is made of smooth metal materials, such as galvanized steel sheets, and the interior of the guide section does not need to be filled with honeycomb cores.

The surface of the non-guiding section of the muffler is a micro-perforated plate, and the interior is filled with a honeycomb core.

Furthermore, a baffle is required inside the sound-absorbing sheet, and the axial direction of the baffle is consistent with the axial direction of the sound-absorbing sheet. The baffle divides the interior of the muffler into two closed cavities with the same or different thicknesses. In a specific embodiment, the baffle divides the sound damping sheet into cavities with a thickness ratio of 2:1.

The honeycomb core, the micro-perforated plate and the baffle are fixed by glue, and the honeycomb core in the sound-absorbing sheet divides the large cavity formed by the micro-perforated plate and the baffle into several small cavities, which improves the sound-absorbing performance of the sound-absorbing sheet .

Further, the material of the honeycomb core is aluminum, fireproof kraft paper or PVC, the wall thickness of the honeycomb core is 0.06mm-2mm, and the side length of the honeycomb hole is 3mm-150mm. The honeycomb core meeting this requirement can better realize the sound attenuation effect.

The thickness of the micro-perforated plate is 0.2-2.0mm, the hole diameter is 0.1-1.0mm, and the perforation rate is 0.5%-5%. As a preference, the shell, the baffle inside the sound-absorbing sheet, and the surface material of the guide section at both ends of the sound-absorbing sheet are all galvanized steel sheets with a thickness of 1mm.

Further, ports are provided at both ends of the housing to connect the air duct, preferably flange ports.

(3) Beneficial effects

The utility model uses the honeycomb core to separate the large cavity formed by the micro-perforated plate and the casing or the baffle plate into several small cavities, so as to improve the noise reduction performance of the muffler. Adding a honeycomb core to the cavity formed by the micro-perforated plate and the shell or baffle can significantly improve the structural strength, prevent the internal micro-perforated plate from vibrating under the action of high-speed and high-pressure airflow, and can also improve the sound insulation performance of the shell. In the micro-perforated plate muffler of the utility model, the upper and lower surface cavities in the housing or the upper and lower surface cavities of the muffler sheet may have different thicknesses, thereby widening the sound absorption bandwidth of the muffler.

Description of drawings

Fig. 1 is the front schematic view of the micro-perforated plate muffler described in the utility model;

Fig. 2 is a schematic side view of the micro-perforated plate muffler of the present invention.

In the figure, 1: shell; 2: micro-perforated plate; 3: honeycomb core; 4: baffle; 5: flange interface.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and Simplified descriptions do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

Example 1

As shown in Figures 1 and 2, this embodiment provides a micro-perforated plate muffler with a size of 500mm x 500mm x 1000mm and an effective muffler length of 900mm.

The muffler includes a shell, a micro-perforated plate and a honeycomb core. A micro-perforated plate is arranged in the housing, and a closed cavity is formed between the micro-perforated plate and the housing, and a honeycomb core is filled in the closed cavity, and an adhesive is passed between the honeycomb core, the housing and the micro-perforated plate Glued to fix.

The two ends of the housing are provided with flange interfaces for connecting the ventilation pipes, the length of the interfaces at both ends is 50mm, the section of the interface is rectangular, and the section size is 400×350mm.

The housing has a square cross-section with a cross-sectional size of 500mm×500mm; the micro-perforated plate has a rectangular cross-section with a cross-sectional size of 400mm×350mm, which completely corresponds to the interface cross-section.

Between the micro-perforated plate and the housing, a closed cavity (up, down, left, and right) is formed, the thickness of the cavity on the upper side and both sides is 50 mm, and the thickness of the lower cavity is 100 mm.

The ventilation cavity formed by the micro-perforated plate is provided with a sound-absorbing sheet, the axial direction of the sound-absorbing sheet is consistent with the axial direction of the ventilation cavity, and the two sides of the sound-absorbing sheet are fixedly connected with the micro-perforated plate to eliminate noise The two ends of the sheet are provided with guide sections, which are triangular or arc-shaped. The surface of the non-guiding section of the sound-absorbing sheet is a micro-perforated plate, and the interior of the non-guiding section is filled with a honeycomb core.

The thickness of the sound-absorbing sheet is 150 mm, and the two ends of the sound-absorbing sheet are diversion sections (also called transition sections) in a triangular shape.

A baffle is arranged inside the sound-absorbing sheet, the axial direction of the baffle is consistent with that of the sound-absorbing sheet, and the sound-absorbing sheet is divided into two cavities with a thickness of 100mm and 50mm.

Among them, the casing, the baffle inside the muffler, and the guide sections at both ends of the muffler are all made of galvanized steel sheets with a thickness of 1mm. The material of the honeycomb core is aluminum, the wall thickness of the honeycomb core is 0.08mm, and the side length of the honeycomb hole is 10mm. The micro-perforated plate is a perforated aluminum alloy plate with a plate thickness of 1 mm, a hole size of 0.04×0.4 mm micro-slit holes, and a hole spacing of 1.6 mm.

Example 2

The difference between this embodiment and Embodiment 1 lies in that the four-sided (upper, lower, left, and right) closed cavities formed between the micro-perforated plate and the housing in this embodiment have the same thickness.

Example 3

The difference between this embodiment and Embodiment 1 is that the micro-perforated plate muffler of this embodiment has a tubular structure, and the cross-sections of the housing and the micro-perforated plate are circular.

Example 4

The difference between this embodiment and Embodiment 1 is that this embodiment does not have a sound-absorbing plate structure.

The above is only a specific embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any skilled person familiar with the technical field can easily think of changes within the technical scope disclosed in the utility model Or replacement, all should be covered within the scope of protection of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (9)

1. a microperforated panel acoustic filter, it is characterised in that described microperforated panel acoustic filter includes housing, microperforated panel and honeycomb Core；

Microperforated panel is set in described housing, forms closed cavity between described microperforated panel and housing, in described closed cavity Filled honeycomb core, described honeycomb core is fixing with between housing and microperforated panel to be connected.

Microperforated panel acoustic filter the most according to claim 1, it is characterised in that described honeycomb core and housing and microperforated panel Between fixing by glueing joint.

Microperforated panel acoustic filter the most according to claim 2, it is characterised in that the envelope that described microperforated panel is formed with housing Closing cavity thickness is 20mm-500mm.

Microperforated panel acoustic filter the most according to claim 3, it is characterised in that described housing and the cross section shape of microperforated panel Shape is rectangle.

5. according to the microperforated panel acoustic filter described in claim 1-4 any one, it is characterised in that described microperforated panel is formed Ventilation tract in be provided with anechoic sheet, the axial direction of described anechoic sheet is consistent with the axial direction of ventilation tract, anechoic sheet Both sides and microperforated panel fixing be connected, the two ends of anechoic sheet arrange diversion section, triangular in shape or circular arc；In described anechoic sheet Arranging baffle plate, the axial direction of baffle plate is consistent with the axial direction of anechoic sheet.

Microperforated panel acoustic filter the most according to claim 5, it is characterised in that the surface of the non-diversion section of described anechoic sheet For microperforated panel, the inside filled honeycomb core of non-diversion section.

7. according to the microperforated panel acoustic filter described in claim 1-4 or claim 6 any one, it is characterised in that described The material of honeycomb core is aluminum, fire retardant kraft paper or PVC, and the wall thickness of described honeycomb core is 0.06mm-2mm, and the honeycomb hole length of side is 3mm-150mm。

Microperforated panel acoustic filter the most according to claim 7, it is characterised in that described microperforated panel thickness of slab is 0.2- 2.0mm, aperture 0.1-1.0mm, punching rate 0.5%-5%.

Microperforated panel acoustic filter the most according to claim 7, it is characterised in that described housing two ends arrange flange-interface and use To connect breather line.