Honeycomb type folded plate exhaust silencer

Abstract

The utility model discloses a honeycomb type folded plate air exhaust silencer which comprises a shell with ventilation honeycomb openings in the two ends, a silencing assembly is arranged in the shell and comprises a plurality of sound absorption folded plates arranged at intervals and a pair of metal baffles for clamping and fixing the sound absorption folded plates, and the metal baffles are arranged in the shell. Ventilation channels for noise to pass through are formed between the adjacent sound absorption folded plates and the ventilation honeycomb openings in the two ends. The device provided by the utility model can effectively reduce the exhaust noise of the air conditioning unit.

Description

Technical Field

[0001] The utility model belongs to the technical field of sound elimination, and in particular relates to a honeycomb type folding plate exhaust silencer. Background Art

[0002] With the acceleration of urbanization and the improvement of people's living standards, central air conditioning has become an indispensable part of modern buildings. However, the noise of central air conditioning systems, especially air conditioning units, is caused by the periodic pulsation of the fan blades by the uneven air flow at the outlet. The weight of the fan blades and the uneven distribution of the pressure on the fan blades cause the disturbance of the surrounding gas and parts when rotating, which constitutes rotational noise. When the gas flows through the fan blades, turbulent layers, vortices and vortex separation are generated, causing the pulsation of the pressure distribution on the fan blades and generating eddy noise.

[0003] This will not only affect people's comfort, but may also have a negative impact on people's health. Therefore, research on noise treatment of air-conditioning units is particularly important.

[0004] Patent document CN208793169U discloses an air conditioning exhaust fan power generation and noise reduction device, including a fixed disk, a noise reduction accelerator, a rectifier accelerator and a power generation unit; the fixed disk is fixedly connected to the exhaust fan, the air inlet of the noise reduction accelerator is connected to the air outlet of the exhaust fan through the fixed disk, a plurality of heat-conducting ribs with serrated trailing edges are evenly spaced on the inner wall of the noise reduction accelerator, sound-absorbing material is provided between the heat-conducting ribs and the inner wall of the noise reduction accelerator, the air outlet of the noise reduction accelerator is connected to the air inlet of the rectifier accelerator; the rectifier air outlet is provided with a power generation unit.

[0005] Patent document CN219345093U discloses a low-noise hair dryer, comprising a handle shell and an annular bracket; a ventilation hole is provided in the middle of the annular bracket, and a sound insulation groove is provided on the inner side of the ventilation hole so that the wool felt is connected to the ventilation hole, and a sound-absorbing layer is provided at the end of the annular bracket, and the sound-absorbing layer comprises a honeycomb structure composed of a plurality of structural units of the same shape arranged according to a preset rule; each structural unit has an air flow hole; the air flow can flow through the air flow holes of the structural unit, and the uniform distribution of each structural unit can adjust the air flow in the air duct, so that the air flow distribution through the air duct is more uniform, so as to avoid the occurrence of high-frequency noise caused by uneven distribution of the air flow direction, thereby reducing the noise of the hair dryer; a sound insulation groove is provided on the side of the annular bracket, and when the air flow passes through the ventilation holes of the annular bracket, the wool felt can further reduce the noise of the air flow, thereby achieving secondary noise reduction and improving the noise reduction effect. Utility Model Content

[0006] The utility model aims to provide a honeycomb type folding plate exhaust muffler, which can effectively reduce the exhaust noise of an air conditioning unit.

[0007] In order to achieve the purpose of the utility model, the following technical solution is provided: a honeycomb type folded plate exhaust silencer, comprising a shell with ventilation honeycomb openings at both ends, a silencer assembly is arranged in the shell, and the silencer assembly includes a plurality of sound-absorbing folded plates arranged at intervals, and a pair of metal baffles for clamping and fixing the plurality of sound-absorbing folded plates, a ventilation channel for noise to pass through is formed between adjacent sound-absorbing folded plates and through the ventilation honeycomb openings at both ends.

[0008] The utility model offsets or absorbs noise through a bent ventilation channel and reduces wind pressure loss based on a honeycomb-type inlet and outlet, thereby achieving the task of silencing medium and high frequency noise.

[0009] Specifically, a guide wedge is provided at the air inlet of the ventilation honeycomb to reduce the wind resistance at the air inlet end.

[0010] Specifically, there are multiple silencer components, which are stacked up and down to form a ventilation channel matrix. There are multiple silencer components, which are stacked up and down to form a ventilation channel matrix. A perforated sound-absorbing baffle is provided between every two silencer components to increase the air intake and thus improve the sound reduction efficiency.

[0011] Specifically, the perforated sound-absorbing partition is made of one or more of organic fiber materials, hemp-cotton felt, inorganic fiber materials, glass wool, rock wool, mineral wool, urea-formaldehyde foam plastics and urethane foam plastics.

[0012] Specifically, the sound-absorbing folding plate is obtained by punching holes in a metal folding plate based on the Helmholtz resonance sound absorption principle based on noise spectrum characteristics.

[0013] Specifically, the shell is made of metal sheet, which is convenient for adapting to air outlet ducts of different specifications and sizes, and is used to protect the internal structure of the muffler.

[0014] Specifically, the two ends of the shell provided with ventilation honeycomb openings are made of steel or aluminum.

[0015] Specifically, a mounting ring is arranged on the outer side of the shell to facilitate transportation.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The silencer is improved based on the honeycomb air inlet and outlet, and the sound-absorbing folding plates are used to absorb and reduce the exhaust noise of the air-conditioning unit, thereby achieving the task of silencing medium and high-frequency noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a honeycomb type folded plate exhaust muffler provided in this embodiment;

[0019] In the figure, 1. ventilation honeycomb; 2. sound-absorbing folding plate; 3. porous sound-absorbing baffle; 4. shell; 5. metal baffle; 6. guide wedge. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] like Figure 1 As shown, the honeycomb folded plate exhaust silencer provided in this embodiment, the silencer principle of the silencer is: when the sound wave passes through the pipe lined with porous sound-absorbing material, the sound wave will stimulate the vibration of the air molecules in the countless small holes in the material, and consume part of the sound energy to overcome the friction and viscosity to achieve the purpose of silencer. The silencer provided in this embodiment is mainly used for exhaust noise reduction of air conditioning units, especially for the task of silencer of medium and high frequency noise.

[0022] The silencer provided in this embodiment includes a shell 4 with ventilation honeycomb openings at both ends, and a silencer assembly is arranged in the shell. The silencer assembly includes a plurality of sound-absorbing folded plates 2 arranged at intervals, and a pair of metal baffles 5 for clamping and fixing the plurality of sound-absorbing folded plates 2, and a ventilation channel for noise to pass through is formed between adjacent sound-absorbing folded plates 2 and through the ventilation honeycomb openings 1 at both ends.

[0023] Furthermore, the ventilation honeycomb 1 is usually rectangular, and the size of the rectangle needs to be designed according to the spectral characteristics of the noise. In order to reduce the wind pressure loss of the muffler, the ventilation honeycomb 1 needs to be optimized according to the exhaust characteristics of the fan. The material of the ventilation honeycomb 1 is usually metal such as steel and aluminum.

[0024] The sound-absorbing folding plate 2 is formed by bending a metal plate, and the bending angle needs to comprehensively consider factors such as noise characteristics, equipment operating power, wind speed, etc. More specifically, the sound-absorbing folding plate 2 is perforated on the metal folding plate based on the Helmholtz resonance sound absorption principle according to the noise spectrum characteristics.

[0025] In addition, the two sound-absorbing folding plates 2 are spaced a certain distance apart and are vertically welded to the two metal baffles 5 to form a ventilation channel of a single ventilation honeycomb 1, and the size of the ventilation honeycomb 1 can be adjusted by adjusting the spacing between the sound-absorbing folding plates 2 and the spacing between the metal baffles.

[0026] There are multiple silencer components, which are stacked up and down to form a ventilation channel matrix. A perforated sound-absorbing baffle 3 is provided between every two silencer components. The perforated sound-absorbing baffle 3 is usually made of organic fiber material, linen cotton felt, inorganic fiber material, glass wool, rock wool, mineral wool, urea-formaldehyde foam plastic, urethane foam plastic, etc.

[0027] The shell 4 is usually made of a metal plate to protect the internal structure of the muffler. Its surface usually needs to be galvanized or other anti-rust treatments. In addition, an installation ring is arranged on its outer side to facilitate lifting.

[0028] A guide wedge 6 is provided at the air inlet of the shell 4, and its function is to reduce the wind resistance at the air inlet end of the muffler as much as possible.

[0029] In addition, the terms "upper", "lower", "inner", "outer", "front", "rear" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Unless otherwise specifically stated, the relative steps, numerical expressions and values ​​of the components and steps described in these embodiments do not limit the scope of the present invention.

[0030] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

[0031] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above-mentioned embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A honeycomb folded plate exhaust muffler, characterized in that: It comprises a shell with ventilation honeycomb openings at both ends, a silencer assembly is arranged in the shell, and the silencer assembly comprises a plurality of sound-absorbing folding plates arranged at intervals, and a pair of metal baffles clamping and fixing the plurality of sound-absorbing folding plates, and a ventilation channel for noise to pass is formed through the ventilation honeycomb openings between adjacent sound-absorbing folding plates and at both ends.

2. The honeycomb type folded plate exhaust muffler according to claim 1, characterized in that: A guide wedge is arranged at the air inlet of the ventilation honeycomb opening.

3. The honeycomb type folded plate exhaust muffler according to claim 1, characterized in that: There are multiple silencer components, and the multiple silencer components are stacked up and down to form a ventilation channel matrix, and a perforated sound-absorbing partition is provided between every two silencer components.

4. The honeycomb folded plate exhaust muffler according to claim 3, characterized in that: The perforated sound-absorbing partition is made of one or more of organic fiber materials, hemp-cotton felt, inorganic fiber materials, glass wool, rock wool, mineral wool, urea-formaldehyde foam plastics and urethane foam plastics.

5. The honeycomb type folded plate exhaust muffler according to claim 1, characterized in that: The sound-absorbing folding plate is obtained by punching holes in a metal folding plate based on the Helmholtz resonance sound absorption principle, based on the noise spectrum characteristics.

6. The honeycomb type folded plate exhaust muffler according to claim 1, characterized in that: The shell is made of metal plate.

7. The honeycomb type folded plate exhaust muffler according to claim 1 or 6, characterized in that: The two ends of the shell body provided with ventilation honeycomb openings are made of steel or aluminum.

8. The honeycomb type folded plate exhaust muffler according to claim 1, characterized in that: A mounting ring is arranged on the outer side of the shell.

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