Composite noise reduction interlayer structure of ventilating duct

Abstract

The utility model discloses a composite noise reduction interlayer structure of a ventilating duct, which belongs to the technical field of ventilating ducts and comprises a heat insulation outer pipe and an air inlet pipe mounted on one side of the heat insulation outer pipe. A sound insulation layer, a damping layer, a sound absorption layer and an inner perforated layer are fixedly connected to the interior of the outer heat preservation pipe from outside to inside. The adjusting handle is rotated to drive the circular plugging plate to adjust the air inlet amount, the adjusting angle of the circular plugging plate can be checked through the scale marks, air enters the ventilation pipeline, at the moment, airflow noise enters the inner wall of the pipeline, the inner perforated layer guides sound waves into the sound absorption layer, preliminary sound absorption treatment is conducted through the porous material, and the damping layer absorbs vibration energy; resonance noise caused by vortexes and pulsation is reduced, the sound insulation layer prevents residual noise from radiating outwards to form a second barrier, the outer-layer heat preservation outer pipe keeps structural integrity, noise reduction is conducted on the ventilation pipeline through multi-stage noise reduction, and the situation that rest of surrounding people is affected is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of ventilation duct technology, and more specifically, to a composite noise reduction sandwich structure for ventilation ducts. Background Technology

[0002] Ventilation ducts are a crucial component of modern building and industrial systems, widely used in central air conditioning, exhaust, supply, fire smoke extraction, underground space ventilation, and many other fields.

[0003] Based on the above, the inventors have discovered that: currently, when ventilation ducts are in use, the movement of gas within the duct and its impact on the inner wall of the duct will generate noise. At the same time, the vibration of the duct itself will also generate noise, which will affect the rest of people in the surrounding area. Therefore, in view of this, the inventors have studied and improved the existing structure to provide a composite noise reduction sandwich structure for ventilation ducts, in order to achieve a more practical purpose. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a composite noise reduction sandwich structure for ventilation ducts. It can prevent noise generated by gas impacting the inner wall of the duct when it moves inside the duct. At the same time, the vibration of the duct itself will also generate noise, which will affect the rest of the surrounding people.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A composite noise-reducing sandwich structure for ventilation ducts includes an insulated outer pipe and an air inlet pipe. The air inlet pipe is installed on one side of the insulated outer pipe, and the inner side of the insulated outer pipe is fixedly connected with a sound insulation layer, a damping layer, a sound-absorbing layer, and an inner perforated layer from the outside to the inside. The inner sidewall of the air inlet pipe is equipped with a first mounting plate and a second mounting plate from top to bottom. A connecting column is installed between the first mounting plate and the second mounting plate. A circular sealing plate is installed on one side of the connecting column. A mounting bracket is bolted to the top of the connecting column. An adjusting handle is installed on the top of the connecting column. A fastening button is threaded to the inner side of the adjusting handle, and a scale line is fixedly connected to the upper part of the adjusting handle.

[0009] Furthermore, the outer insulation pipe and the air inlet pipe are made entirely of galvanized steel sheet, the sound insulation layer is made entirely of high-density fiberboard, the damping layer is made entirely of rubber-based material, the sound absorption layer is made entirely of centrifugal glass wool, and the inner perforated layer is made entirely of galvanized steel sheet.

[0010] Furthermore, an arc-shaped groove is provided on the inner side of the adjustment handle, and the scale lines are distributed in a semi-arc shape on one side of the arc-shaped groove.

[0011] Furthermore, a fastening disc is threadedly connected to the lower part of the fastening button, and the fastening disc is embedded inside the mounting bracket.

[0012] Furthermore, the inner side of the circular sealing plate is provided with three sets of equally spaced threaded grooves, which are connected to the connecting column by bolts.

[0013] Furthermore, the surface of the inner perforated layer is provided with uniformly distributed micropores, and the diameter of each micropore is consistent.

[0014] Furthermore, the circular sealing plate is bolted to the connecting column, and a movable shaft is installed on the inner side of the mounting plate, with the top of the movable shaft connected to the bottom of the connecting column.

[0015] 3. Beneficial effects

[0016] Compared with existing technologies, the advantages of this utility model are:

[0017] This solution involves fixing a sound insulation layer, a damping layer, a sound-absorbing layer, and an inner perforated layer to the inside of the insulated outer pipe from the outside in. When using the ventilation duct, first turn the adjustment handle to move the circular sealing plate to adjust the air intake. The scale lines indicate the adjustment angle of the circular sealing plate. As air enters the ventilation duct, airflow noise enters the inner wall of the duct. The inner perforated layer guides the sound waves into the sound-absorbing layer, where the porous material performs initial sound absorption. The damping layer absorbs vibration energy, reducing resonance noise caused by eddies and pulsations. The sound insulation layer prevents residual noise from radiating outward, forming a second barrier. The outer insulated outer pipe maintains structural integrity and also provides insulation. This multi-stage noise reduction effectively reduces noise in the ventilation duct, preventing disturbance to surrounding personnel. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the planar aspect of this utility model;

[0020] Figure 3 This is a schematic diagram of the air inlet pipe of this utility model;

[0021] Figure 4 This is a schematic diagram of the main body of the pipe of this utility model.

[0022] Explanation of the labels in the diagram:

[0023] 1. Insulated outer pipe; 2. Air inlet pipe; 3. Mounting bracket; 4. Adjustment handle; 5. Fastening button; 6. Scale line; 7. Sound insulation layer; 8. Damping layer; 9. Sound absorption layer; 10. Inner perforated layer; 11. Circular sealing plate; 12. Connecting column; 13. Mounting plate one; 14. Mounting plate two. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Example:

[0026] Please see Figure 1-4 A composite noise-reducing sandwich structure for ventilation ducts includes an insulated outer pipe 1 and an air inlet pipe 2. The air inlet pipe 2 is installed on one side of the insulated outer pipe 1 and is used for air to enter the ventilation duct. The interior of the insulated outer pipe 1 is fixedly connected from the outside to the inside with a sound insulation layer 7, a damping layer 8, a sound-absorbing layer 9, and an inner perforated layer 10, which are used to reduce noise within the ventilation duct. The inner wall of the air inlet pipe 2 is fitted with a first mounting plate 13 and a second mounting plate 14 from top to bottom, which are used to install a connecting column 12. A connecting column 12 is installed between the first mounting plate 13 and the second mounting plate 14, and the connecting column 12 is used to install a circular sealing plate 11. A circular sealing plate 11 is installed on one side of the connecting column 12, and the circular sealing plate 11 is used to control the air intake in conjunction with an adjusting handle 4. A mounting bracket 3 is bolted to the top of the connecting column 12, and the mounting bracket 3 is used to install the adjusting handle 4. The adjusting handle 4 is installed on the top of the connecting column 12, and a fastening button 5 is threaded to the inside of the adjusting handle 4. A scale line 6 is fixedly connected to the upper part of the adjusting handle 4. The adjusting handle 4 and the scale line 6 are used to adjust the angle of the circular sealing plate 11.

[0027] See Figure 1 and Figure 2The outer insulation pipe 1 and the air inlet pipe 2 are made entirely of galvanized steel plate. The outer insulation pipe 1 and the air inlet pipe 2 are used to increase the strength of the ventilation duct. The sound insulation layer 7 is made entirely of high-density fiberboard. The sound insulation layer 7 is used to block external noise from spreading inward and prevent internal noise from leaking out. The damping layer 8 is made entirely of rubber-based material. The damping layer 8 is used to absorb resonance noise caused by airflow disturbance and reduce structural sound transmission. The sound absorption layer 9 is made entirely of centrifugal glass wool. The sound absorption layer 9 is used to absorb mid-to-high frequency noise. The inner perforated layer 10 is made entirely of galvanized steel plate. The inner perforated layer 10 is used to guide sound waves in the airflow into the sound absorption layer 9.

[0028] See Figure 1 and Figure 3 An arc-shaped groove is provided on the inner side of the adjustment handle 4, and the scale line 6 is distributed in a semi-arc shape on one side of the arc-shaped groove. The adjustment handle 4 and the scale line 6 are used to adjust the angle of the circular sealing plate 11, thereby adjusting the air volume of the air inlet pipe 2.

[0029] See Figure 1 and Figure 3 The fastening button 5 is threadedly connected to a fastening disc below it. The fastening disc is embedded inside the mounting bracket 3. The fastening button 5 passes through the mounting bracket 3 and is threadedly connected to the fastening disc, thereby achieving the purpose of limiting the adjustment handle 4.

[0030] See Figure 2 and Figure 3 The inner side of the circular sealing plate 11 is provided with three sets of equally spaced threaded grooves. The threaded grooves are connected to the connecting column 12 by bolts. The threaded grooves are used to connect the circular sealing plate 11 and the connecting column 12 together with the bolts.

[0031] See Figure 2 and Figure 4 The surface of the inner perforated layer 10 is provided with uniformly distributed micropores, each of which has the same pore diameter. The micropores are used to guide sound waves in the airflow into the sound-absorbing layer 9.

[0032] See Figure 2 and Figure 3 The circular sealing plate 11 is bolted to the connecting column 12. A movable shaft is installed on the inner side of the mounting plate 13. The top of the movable shaft is connected to the bottom of the connecting column 12. The movable shaft is used to assist the circular sealing plate 11 and the connecting column 12 to rotate, so that the circular sealing plate 11 can rotate inside the air inlet pipe 2.

[0033] In use: First, turn the adjustment handle 4 to drive the circular sealing plate 11 to adjust the air intake. The scale line 6 can be used to check the adjustment angle of the circular sealing plate 11. When the air enters the ventilation duct, the airflow noise enters the inner wall of the duct. The inner perforated layer 10 guides the sound waves into the sound-absorbing layer 9, which is initially treated by the porous material. The damping layer 8 absorbs the vibration energy and reduces the resonance noise caused by eddies and pulsations. The sound insulation layer 7 prevents the remaining noise from radiating outward, forming a second barrier. The outer heat-insulating outer pipe 1 maintains the structural integrity and also has a heat-insulating function. Multi-stage noise reduction is used to reduce the noise of the ventilation duct, effectively avoiding affecting the rest of the surrounding people.

[0034] Finally, it should be noted that in the description of this utility model, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A ventilation duct composite noise reduction sandwich structure, comprising a heat preservation outer pipe (1) and an air inlet pipe (2), the air inlet pipe (2) is installed on one side of the heat preservation outer pipe (1), and the inside of the heat preservation outer pipe (1) is fixedly connected with, from outside to inside, a sound insulation layer (7), a damping layer (8), a sound absorption layer (9) and an inner perforated layer (10), characterized in that: The inner side wall of the air inlet pipe (2) is respectively provided with mounting disc one (13) and mounting disc two (14) from top to bottom, connecting column (12) is installed between mounting disc one (13) and mounting disc two (14), one side of connecting column (12) is provided with circular plugging plate (11), mounting rack (3) is bolted on the upper side of connecting column (12), adjusting handle (4) is installed on the top of connecting column (12), fastening button (5) is threadedly connected on the inner side of adjusting handle (4), and scale line (6) is fixedly connected on the upper part of adjusting handle (4).

2. A composite noise-reducing duct liner structure according to claim 1, wherein: The heat preservation outer tube (1) and the air inlet pipe (2) are made of galvanized steel sheet material, the sound insulation layer (7) is made of high density fiberboard material, the damping layer (8) is made of rubber base material, the sound absorption layer (9) is made of centrifugal glass wool material, and the inner layer perforated layer (10) is made of galvanized steel sheet material.

3. A composite noise-reducing air duct lining structure according to claim 1, wherein: The inner side of the adjusting handle (4) is provided with an arc-shaped groove, and the scale line (6) is distributed in a half-arc shape on one side of the arc-shaped groove.

4. A composite noise-reducing vent duct liner structure according to claim 1, wherein: The lower side of the fastening button (5) is threadedly connected with a fastening disc, and the fastening disc is embedded in the inner side of the mounting rack (3).

5. A composite noise-reducing vent duct lining structure according to claim 1, wherein: The inner side of the circular plugging plate (11) is provided with three groups of thread grooves which are distributed at equal distances, and the thread grooves are connected with the connecting column (12) through bolts.

6. A composite noise-reducing vent duct liner structure according to claim 1, wherein: The inner side of the inner layer perforated layer (10) is provided with micro-holes which are distributed in a surrounding manner, and the aperture of each micro-hole is consistent.

7. A composite noise-reducing vent duct liner structure according to claim 1, wherein: The circular plugging plate (11) is bolted with the connecting column (12), the inner side of the mounting disc one (13) is provided with a movable shaft, and the top of the movable shaft is connected with the bottom of the connecting column (12).

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