Silencing sheet structure with good air permeability
By designing an acoustic snapped structure that includes a diversion film and a backlifting groove, it solves the problem that the existing mufflers are difficult to achieve better sound anti -sounding effect without lowering ventilation. The goal of sound effect.
Patent Information
- Application Number
- CN202323663054.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2033-12-29
AI Technical Summary
While maintaining ventilation flow and flow rate, it is difficult for existing mufflers to achieve better muffler effects without reducing ventilation.
Design a good -emilerd muffle structure, including the plate -shaped body fixed in the ventilation direction in the ventilation pipeline in the ventilation direction. The surface is equipped with a guide sheet and a backlifting groove. The shell is a porous structure and fills the sound absorption material.
Through the design of the diversion and the reflection groove, the airflow forms negative pressure when passing, increasing the contact area of the airflow and the muffled medium, improves the effect of sound consumption, while maintaining ventilation, and avoiding the generation of additional noise.
Smart Images
Figure CN222393070U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building ventilation systems and relates to a sound-absorbing sheet structure with good air permeability. Background Art
[0002] The purpose of installing a silencer in the ventilation duct of a building is to reduce the noise generated during the ventilation process while maintaining a certain ventilation flow rate and flow rate. Generally speaking, the air permeability and silencing effect of the silencer are contradictory. To increase the silencing effect, it is necessary to increase the proportion and frequency of airflow passing through or contacting the silencing material as much as possible. As a building ventilation system, air permeability is undoubtedly the core energy efficiency indicator. For this reason, the present application designs a silencing sheet structure that has a smaller impact on air permeability and has a better silencing effect. Utility Model Content
[0003] The purpose of the utility model is to provide a sound-absorbing sheet structure with good air permeability in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the utility model is how to achieve a better sound-absorbing effect under the condition of good air permeability of the package.
[0004] The purpose of the utility model can be achieved through the following technical solutions: a sound-absorbing sheet structure with good air permeability, characterized in that it includes a plate-like body fixed in the ventilation duct along the flow direction of the ventilation duct where the sound-absorbing sheet is located, the plate-like body includes two symmetrically arranged sound-absorbing sections, the sound-absorbing sections have a thickness that gradually increases from the outer end to the inner end, a plurality of guide plates are alternately arranged on the plate surface of the sound-absorbing section, the guide plates are inclined to the outer side of the plate surface of the sound-absorbing section at an inclination angle of 10 to 30 degrees, and there is a concave reflux groove between adjacent guide plates.
[0005] Furthermore, the outer end of the sound-absorbing section has a mounting hole.
[0006] Furthermore, the plate-shaped body includes a shell and a sound-absorbing material filled in the shell.
[0007] Furthermore, the shell is a porous structure.
[0008] The muffler is a symmetrical structure, and the installation direction does not need to be considered during installation. Multiple mufflers are installed in the ventilation duct, and the overall flow direction of the airflow is parallel to the line connecting the two installation holes. When the airflow passes through, the guide plate guides the airflow to reduce the airflow flow cross-section. The flow velocity and airflow pressure in the reduction area are increased. After the airflow passes through the previous guide plate, a negative pressure is formed on the outside of the front section of the next guide plate and the return groove on the inside of the guide plate, which has an adsorption effect on the airflow, that is, the Venturi tube principle. In the process of the airflow moving toward the muffler plate surface caused by the pressure difference, the air at a smaller airflow velocity can also act with the muffler medium in the area with smaller air pressure to play a muffler effect. Therefore, this scheme forms a state in which the airflow moves toward the plate surface or hits the plate surface through the continuous pressure change of the airflow on the outside of the plate surface, so that more airflow can contact the plate surface when the overall airflow resistance is small, thereby improving the muffler effect. In addition, since the strong airflow is applied to a smooth surface, the wind resistance is small, and the weak airflow will not generate a large additional noise due to the reduction of the airflow velocity. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a structural schematic diagram of a silencer equipped with the silencer sheet structure.
[0010] Figure 2 It is a cross-sectional view of the structure of the sound-absorbing sheet.
[0011] In the figure, 1. plate-shaped body; 2. guide plate; 3. return groove; 4. mounting hole. DETAILED DESCRIPTION
[0012] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0013] like Figure 2 The structure of the muffler sheet shown includes a plate-like body 1 fixed in the ventilation duct along the flow direction of the ventilation duct where the muffler sheet is located. The plate-like body 1 includes two symmetrically arranged muffler sections, the thickness of which gradually increases from the outer end to the inner end. The plate surface of the muffler section is alternately provided with a plurality of guide vanes 2, which are inclined at an angle of 10 to 30 degrees toward the outer side of the muffler section plate surface, and there is a concave reflux groove 3 between adjacent guide vanes 2. The outer end of the muffler section has a mounting hole 4, and the muffler sheet is fixed to the ventilation duct by passing a pin through the mounting hole 4, such as Figure 1 as shown, making it parallel to the airflow direction.
[0014] The plate-like body 1 includes a shell and a sound-absorbing material filled in the shell. The shell is a porous structure, and the sound-absorbing material can be mineral wool, glass wool, polymer wool, etc.
[0015] The muffler is a symmetrical structure, and the installation direction does not need to be considered during installation. Multiple mufflers are installed in the ventilation duct, and the overall flow direction of the airflow is parallel to the line connecting the two mounting holes 4. When the airflow passes through, the guide plate 2 guides the airflow to reduce the airflow flow cross-section. The flow velocity and airflow pressure in the reduction area are increased. After the airflow passes through the previous guide plate 2, a negative pressure is formed at the outer side of the front section of the next guide plate 2 and the return groove 3 on the inner side of the guide plate 2, which has an adsorption effect on the airflow, that is, the Venturi tube principle. In the process of the airflow moving toward the muffler plate surface caused by the pressure difference, the air at a smaller airflow velocity can also act with the muffler medium in the area with smaller air pressure to play a muffler effect. Therefore, this scheme forms a state in which the airflow moves toward the plate surface or hits the plate surface through the continuous pressure change of the airflow on the outside of the plate surface, so that more airflow can contact the plate surface when the overall airflow resistance is small, thereby improving the muffler effect. In addition, since the strong airflow is applied to a smooth surface, the wind resistance is small, and the weak airflow will not generate a large additional noise due to the reduction of the airflow velocity.
[0016] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A sound-absorbing sheet structure with good ventilation, characterized in that: The invention comprises a plate-shaped body (1) fixed in a ventilation duct along the flow direction of the ventilation duct where the silencer plate is located, the plate-shaped body (1) comprising two symmetrically arranged silencer sections, the silencer sections having thicknesses gradually increasing from the outer end to the inner end, a plurality of guide plates (2) being alternately arranged on the plate surface of the silencer section, the guide plates (2) being inclined at an angle of 10 to 30 degrees toward the outer side of the silencer section plate surface, and a concave reflux groove (3) being provided between adjacent guide plates (2).
2. A sound-absorbing sheet structure with good ventilation according to claim 1, characterized in that: The outer end of the muffler section is provided with a mounting hole (4).
3. A sound-absorbing sheet structure with good ventilation according to claim 1, characterized in that: The plate-shaped body (1) comprises a shell and a sound absorbing material filled in the shell.
4. A sound-absorbing sheet structure with good ventilation according to claim 3, characterized in that: The shell is a porous structure.