CN204551779U - Double-deck series connection medical clean microperforated panel noise damper - Google Patents

Abstract

The utility model discloses a double-layer series-connected medical clean micro-perforated plate muffler, which has a casing. The front and rear ends of the casing are provided with an inlet pipe and an outlet pipe, and a first pipe is connected between the inlet pipe and the outlet pipe. A micro-perforated plate, a second micro-perforated plate is arranged between the first micro-perforated plate and the housing, and several micro-perforated plates are uniformly arranged on the first micro-perforated plate and the second micro-perforated plate. The structure is simple, easy to use, and has good broadband absorption characteristics. It is composed of thin metal or other materials with micro-holes with a diameter of less than 1mm, and a cavity behind the plate. It is clean, pollution-free, high-temperature resistant, and corrosion-resistant. , The characteristics of being able to withstand the impact of high-speed airflow, in the case of high temperature, its relative acoustic resistance will become larger, the relative sound quality will become smaller, the resonance frequency will move to high frequency, and the frequency bandwidth will increase.

Description

Double-layer series medical clean micro-perforated plate silencer

technical field

The utility model relates to a double-layer series-connected medical clean micro-perforated plate muffler.

Background technique

The muffler is a device that prevents sound transmission and allows airflow to pass through, and is an important measure to eliminate aerodynamic noise. The muffler is a noise reduction device installed on the airflow channel of the aerodynamic equipment or in the intake and exhaust system. The micro-perforated plate muffler is generally made of a pure metal sheet with a thickness of less than 1mm, and a drill bit with a hole diameter of less than 1mm is used to perforate the sheet with a perforation rate of 1%-3%. By choosing different perforation ratios and cavity depths with different plate thicknesses, the spectrum performance of the muffler can be controlled, so that it can obtain a good noise reduction effect in the required frequency range. For environmental systems with high temperature, high humidity, oil mist, and water vapor, microporous structure noise reduction equipment is generally used. For environmental systems with clean requirements such as operating rooms, recording rooms, and clean workshops, microporous structure noise reduction equipment should be used.

In building decoration such as hospitals, whether it is to control reverberation time, reduce noise, improve sound diffusion or eliminate sound quality defects, it is inseparable from the use of sound-absorbing materials. Sound-absorbing materials play an important role in improving sound quality and reducing noise. The micro-perforated plate sound-absorbing structure is widely used in many fields such as sound absorption and noise reduction. It is inconvenient to install and transport, increase workload, complex structure, narrow noise reduction frequency band, large pressure loss, and large air regeneration noise, which cannot achieve noise reduction and environmental protection. At the same time, it is not easy to control. Resistive packing will be used during use, and dust will be generated during work. It is afraid of oil mist and water vapor. It has poor resistance to high temperature, corrosion resistance and high-speed airflow impact, and has a long service life. Short, need to be replaced frequently, increase production cost.

Contents of the invention

The technical problem to be solved by the utility model is to provide an improved double-layer series medical clean micro-perforated plate muffler in order to solve the problems existing in the prior art in the above-mentioned background technology.

The technical scheme adopted by the utility model to solve the technical problem is: a double-layer serial medical clean micro-perforated plate muffler, which has a shell, and the front and rear ends of the shell are provided with an inlet pipe and an outlet pipe, and the inlet pipe A first micro-perforated plate is connected to the outlet pipe, a second micro-perforated plate is arranged between the first micro-perforated plate and the housing, and several micro-perforated plates are uniformly arranged on the first micro-perforated plate and the second micro-perforated plate.

Further, the perforation rate of the first micro-perforated plate and the second micro-perforated plate is 1.4%-1.6%, the diameter of the micro-perforated plate is 0.3-0.5mm, and the plate thickness of the micro-perforated plate is 0.3-0.6mm, The structure is simple, the use is convenient, and it has good broadband absorption characteristics.

Further, the shape of the micro-perforation is square, the center-to-center distance between the holes is 2-4mm, and the ratio of the front and rear cavity depths is 3:1, which has good broadband absorption characteristics and can withstand the impact of high-speed airflow , in the case of high temperature, the relative acoustic resistance will become larger, the relative acoustic mass will become smaller, the resonant frequency will move to high frequency, and the frequency bandwidth will increase.

Further, the shell is made of steel, stainless steel or alloy steel, which has the characteristics of cleanness, no pollution, high temperature resistance, corrosion resistance, and can withstand the impact of high-speed airflow. It uses a wide range of materials and prolongs the use of the product. Long life, no need for frequent maintenance and replacement.

The beneficial effect of the utility model is that the utility model is simple in structure, easy to use, and has good broadband absorption characteristics. It is formed by piercing a thin plate of metal or other materials with micropores with a diameter of less than 1mm, and adding a cavity behind the plate. , has the characteristics of cleanness, no pollution, high temperature resistance, corrosion resistance, and can withstand the impact of high-speed airflow. Under high temperature conditions, its relative acoustic resistance will become larger, the relative sound quality will become smaller, the resonance frequency will move to high frequency, and the frequency bandwidth will increase. .

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a structural representation of the utility model.

Among the figures: 1. housing, 2. inlet pipe, 3. outlet pipe, 4. first micro-perforated plate, 5. second micro-perforated plate, 6. micro-perforated.

Detailed ways

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

As shown in Figure 1, a double-layer serial medical clean micro-perforated plate muffler has a housing 1, and the front and rear ends of the housing 1 are provided with an inlet pipe 2 and an outlet pipe 3, and the inlet pipe 2 and the outlet pipe 3 is connected with a first micro-perforated plate 4, a second micro-perforated plate 5 is provided between the first micro-perforated plate 4 and the housing 1, and the first micro-perforated plate 4 and the second micro-perforated plate 5 are evenly provided with Several microperforations 6, the perforation rate on the first microperforation plate 4 and the second microperforation plate 5 is 1.4%-1.6%, the diameter of the microperforation 6 is 0.3-0.5mm, and the plate thickness of the microperforation plate 6 is 0.3- 0.6mm, the shape of the micro-perforation 6 is square, the distance between the holes is 2-4mm, the ratio of the front and rear cavity depths is 3:1, and the shell 1 is made of steel, stainless steel or alloy steel.

The specific double-layer micro-perforated plate is connected in series with a layer of second micro-perforated plate 5 and the cavity structure after the structure of the first micro-perforated plate 4, so that the frequency band can be expanded to the low-frequency direction, while the high-frequency absorption is not affected. The noise absorption capacity is enhanced in the entire frequency band. After installing the muffler, the noise of the original air pump is greatly reduced, and the noise reduction is particularly obvious when it falls below the target value in the entire frequency band.

Inspired by the above ideal embodiment according to the utility model, through the above description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (4)

1. A double-layer series medical clean micro-perforated plate muffler has a housing (1), characterized in that: the front and rear ends of the housing (1) are provided with inlet pipes (2) and outlet pipes (3 ), the first micro-perforated plate (4) is connected between the inlet pipe (2) and the outlet pipe (3), and the second micro-perforated plate (4) is provided between the first micro-perforated plate (4) and the housing (1) 5), the first micro-perforated plate (4) and the second micro-perforated plate (5) are uniformly provided with several micro-perforated holes (6). 2. The double-layer serial medical clean micro-perforated plate muffler according to claim 1, characterized in that: the perforation rate of the first micro-perforated plate (4) and the second micro-perforated plate (5) is 1.4 %-1.6%, the diameter of the micro-perforated plate (6) is 0.3-0.5 mm, and the thickness of the micro-perforated plate (6) is 0.3-0.6 mm. 3. The double-layer serial medical clean micro-perforated plate muffler according to claim 1, characterized in that: the shape of the micro-perforated (6) is square, and the distance between the holes is 2-4mm. The ratio of anterior and posterior chamber depths is 3:1. 4. The double-layer serial medical clean micro-perforated plate muffler according to claim 1, characterized in that: the housing (1) is made of steel, stainless steel or alloy steel.