A noise reduction structure for air ducts on passenger roll-on / roll-off ships

Abstract

This utility model provides a noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship: it includes a ventilation duct, within which a noise reduction channel is slidably connected. A gap cavity is provided between the outer wall of the noise reduction channel and the inner wall of the ventilation duct. A layer of noise-reducing cotton is wrapped inside the gap cavity on the outer wall of the noise reduction channel. Several noise reduction components are installed inside the noise reduction channel. Both the ventilation duct and the noise reduction channel are rectangular pipes. At least two parallel guide rails are provided on the inner walls of both the upper and lower sides of the ventilation duct. Sliding end plates are welded to both ends of the noise reduction channel, and guide grooves are provided on the outer sides of the sliding end plates corresponding to the guide rails. This utility model has a reasonable design, reducing the noise emitted by the ventilation duct of the passenger roll-on / roll-off ship, thereby improving the comfort of the passenger accommodation environment and reducing the rate of customer complaints.

Description

Technical Field

[0001] This utility model relates to a noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship. Background Technology

[0002] A ro-ro passenger ship is a vessel that combines cargo transportation and passenger transport functions, allowing vehicles to enter and exit the cargo hold under their own power. It is primarily used for inland waterway ferries and short-to-medium-distance maritime transport. In other words, a ro-ro passenger ship is a multi-functional vessel that can transport cargo (such as containers and wheeled pallets) and carry passengers; some high-end ro-ro passenger ships even offer accommodation and related entertainment activities. As people's demands for accommodation environments increase, noise from the ventilation ducts in the accommodation cabins of ro-ro passenger ships is increasingly likely to lead to customer complaints and ultimately customer loss. Therefore, a ro-ro passenger ship ventilation duct with sound-absorbing capabilities is needed to reduce noise within the accommodation cabins. Utility Model Content

[0003] In view of this, the purpose of this utility model is to overcome the shortcomings of the prior art and provide a noise reduction structure for the ventilation duct of a passenger ro-ro ship. The structure is reasonably designed to reduce the noise emitted by the ventilation duct of the passenger ro-ro ship, thereby improving the comfort of the passenger accommodation environment and reducing the rate of customer complaints.

[0004] This utility model is achieved by the following scheme: a noise reduction structure for a passenger roll-on / roll-off ship duct: including a ventilation duct, a noise reduction channel slidably connected inside the ventilation duct, a gap cavity provided between the outer wall of the noise reduction channel and the inner wall of the ventilation duct, a noise reduction cotton layer covering the outer wall of the noise reduction channel inside the gap cavity, and a number of noise reduction components installed inside the noise reduction channel.

[0005] Furthermore, both the ventilation duct and the silencing channel are rectangular ducts. At least two parallel guide rails are provided on the inner walls of the upper and lower sides of the ventilation duct. Sliding end plates are welded to both ends of the silencing channel, and guide grooves are provided on the outer side of the sliding end plates corresponding to the guide rails.

[0006] Furthermore, the sliding end plate of the ventilation duct is fixedly engaged with the inner wall of the ventilation duct, and the end face of the sliding end plate is flush with the end face of the ventilation duct.

[0007] Furthermore, the silencing assembly includes a porous ceramic plate. A bracket for fixing the porous ceramic plate is provided within the silencing channel. The bracket includes L-shaped support plates symmetrically arranged vertically. The horizontal part of the L-shaped support plates is fixed to the inner wall of the silencing channel, and the vertical part of the L-shaped support plates is fixed to the edge of the porous ceramic plate. Furthermore, the porous ceramic plate is arched, and the raised surface of the fixed porous ceramic plate faces the windward direction.

[0008] Furthermore, the silencing assembly also includes at least two silencing discs, and the sliding end plate is provided with a mounting groove for placing the silencing discs, the outer periphery of the silencing discs being screwed into the mounting groove.

[0009] Furthermore, the silencer disc includes a disc body, on which several silencers are horizontally arranged. Each silencer includes an inner tube and an outer tube, with a filling gap between the inner tube and the outer tube. The air inlet end of the inner tube is sealed from the air inlet end of the outer tube. Several silencer holes are evenly distributed on the inner tube, and the filling gap is filled with silencer cotton.

[0010] Furthermore, the mufflers on the two muffler discs are staggered.

[0011] Furthermore, the disc body has a threaded hole corresponding to the muffler, and the outer wall of the outer tube has an external thread corresponding to the threaded hole.

[0012] Furthermore, a heat insulation layer is sandwiched between the sound-absorbing channel and the sound-absorbing cotton layer.

[0013] Compared with the prior art, the present invention has the following advantages: it is reasonably designed, reduces the noise emitted by the ventilation pipes of passenger roll-on / roll-off ships, thereby improving the comfort of the passenger accommodation environment and reducing the rate of customer complaints. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the ventilation duct port structure of this utility model; Figure 3 for Figure 1 Schematic diagram of the AA section structure; Figure 4 for Figure 1 Enlarged structural diagram at point B.

[0015] In the diagram: 1-Ventilation duct; 2-Silencing channel; 3-Gap cavity; 4-Silencing cotton layer; 5-Silencing component; 6-Guide rail; 7-Sliding end plate; 8-Guide groove; 9-Insertion hole; 10-Clamping pin; 11-Porous ceramic plate; 12-L-shaped support plate; 13-Silencing disc; 14-Mounting groove; 15-Disc body; 16-Silencer; 17-Inner tube; 18-Outer tube; 19-Filling gap; 20-Silencing hole; 21-Silencing cotton; 22-Insulation layer. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] like Figure 1-4 As shown, a noise reduction structure for a passenger roll-on / roll-off ship duct includes a ventilation duct 1, a noise reduction channel 2 slidably connected inside the ventilation duct, a gap cavity 3 between the outer wall of the noise reduction channel and the inner wall of the ventilation duct, a noise reduction cotton layer 4 covering the outer wall of the noise reduction channel inside the gap cavity, and several noise reduction components 5 installed inside the noise reduction channel. In use, the noise reduction of the ventilation duct is achieved through the noise reduction cotton layer and the noise reduction components on the noise reduction channel. At the same time, since the noise reduction channel slides into the ventilation duct, the installation is relatively convenient.

[0020] In this embodiment, in order to achieve a sliding fit between the ventilation duct and the silencing channel, both the ventilation duct and the silencing channel are rectangular pipes. At least two parallel guide rails 6 are provided on the inner walls of the upper and lower sides of the ventilation duct. Sliding end plates 7 are welded to the outer ends of the silencing channel. Guide grooves 8 are provided on the outer sides of the sliding end plates corresponding to the guide rails. The sliding fit between the ventilation duct and the silencing channel is achieved through the cooperation of the guide grooves and the guide rails.

[0021] In this embodiment, in order to fix the silencing channel after sliding, the sliding end plate of the ventilation duct is snapped together with the inner wall of the ventilation duct. Specifically, the ventilation duct has a hole 9, and the outer periphery of the sliding end plate is also provided with a corresponding hole. After the two holes are connected, they are fixed by a locking pin 10. The end face of the sliding end plate is flush with the end face of the ventilation duct.

[0022] In this embodiment, to further achieve noise reduction, the noise reduction component includes a porous ceramic plate 11. A bracket for fixing the porous ceramic plate is provided in the noise reduction channel. The bracket includes an L-shaped support plate 12 arranged symmetrically at the top and bottom. The L-shaped support plate is horizontally fixed to the inner wall of the noise reduction channel, and the vertical part of the L-shaped support plate is fixed to the edge of the porous ceramic plate. The noise reduction of the ventilation pipe is further achieved through the porous ceramic plate. Furthermore, the porous ceramic plate is arched, and the convex surface of the porous ceramic plate is facing the windward direction.

[0023] In this embodiment, the noise level in the duct near the ventilation duct outlet is significantly higher than that in the duct not near the outlet. Therefore, it is necessary to further add a silencing mechanism based on the above-mentioned device. Specifically, the silencing assembly also includes at least two silencing discs 13. The sliding end plate is provided with a mounting groove 14 for placing the silencing discs. The outer periphery of the silencing disc is screwed into the mounting groove. The specific structure of the silencing disc is as follows: the silencing disc includes a disc body 15. Several silencers 16 are horizontally placed on the disc body. The silencer includes an inner tube 17 and an outer tube 18. There is a filling gap 19 between the inner tube and the outer tube. The air inlet end of the inner tube is closed to the air inlet end of the outer tube. The other end can be closed by a detachable annular cover plate. Several silencing holes 20 are evenly distributed on the inner tube. The filling gap is filled with silencing cotton 21. Threaded holes are opened on the disc body corresponding to the silencers. External threads are provided on the outer wall of the outer tube corresponding to the threaded holes. The silencers on the two silencing discs are staggered, making the silencing more thorough.

[0024] In this embodiment, for the sake of reasonable design, a heat insulation layer 22 is sandwiched between the sound-absorbing channel and the sound-absorbing cotton layer, and the heat insulation is made of existing heat insulation materials.

[0025] Unless otherwise stated, if any of the technical solutions disclosed in this utility model discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is merely one among many feasible numerical values ​​that has a more obvious or representative technical effect. Because there are many numerical values, it is impossible to list them all. Therefore, this utility model discloses only some numerical values ​​to illustrate the technical solutions of this utility model. Furthermore, the numerical values ​​listed above should not constitute a limitation on the scope of protection of this utility model.

[0026] If the terms "first" or "second" are used in this document to specify components, those skilled in the art should know that the use of "first" or "second" is merely for the purpose of distinguishing components in description, and unless otherwise stated, the above terms have no special meaning.

[0027] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured by integral molding using a casting process) (except where it is obviously impossible to use an integral molding process).

[0028] Furthermore, the orientations or positional relationships indicated by terms such as "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in any of the technical solutions disclosed in this utility model are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this patent. They are not intended to 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 patent. In addition, unless otherwise stated, the terms used to indicate shape in any of the technical solutions disclosed in this utility model include shapes that are similar to, close to, or approximate with it.

[0029] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship, characterized in that: The system includes a ventilation duct, a sound-absorbing channel that slides inside the ventilation duct, a gap cavity between the outer wall of the sound-absorbing channel and the inner wall of the ventilation duct, a sound-absorbing cotton layer covering the outer wall of the sound-absorbing channel inside the gap cavity, and several sound-absorbing components installed inside the sound-absorbing channel.

2. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 1, characterized in that: The ventilation duct and the silencing channel are both rectangular pipes. At least two parallel guide rails are provided on the inner walls of the upper and lower sides of the ventilation duct. Sliding end plates are welded to both ends of the silencing channel, and guide grooves are provided on the outer side of the sliding end plates corresponding to the guide rails.

3. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 2, characterized in that: The sliding end plate of the ventilation duct is fixedly engaged with the inner wall of the ventilation duct, and the end face of the sliding end plate is flush with the end face of the ventilation duct.

4. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 1, characterized in that: The noise reduction assembly includes a porous ceramic plate. A bracket for fixing the porous ceramic plate is provided in the noise reduction channel. The bracket includes L-shaped support plates arranged symmetrically at the top and bottom. The horizontal part of the L-shaped support plate is fixed to the inner wall of the noise reduction channel, and the vertical part of the L-shaped support plate is fixed to the edge of the porous ceramic plate.

5. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 4, characterized in that: The porous ceramic plate is arched, with the raised surface of the fixed porous ceramic plate facing the upwind direction.

6. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 2, characterized in that: The noise reduction assembly also includes at least two noise reduction discs, and the sliding end plate is provided with a mounting groove for placing the noise reduction discs, and the outer periphery of the noise reduction discs is screwed into the mounting groove.

7. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 6, characterized in that: The silencing disc includes a disc body, on which several silencers are horizontally placed. Each silencer includes an inner tube and an outer tube, with a filling gap between the inner tube and the outer tube. The air inlet end of the inner tube is sealed from the air inlet end of the outer tube. Several silencing holes are evenly distributed on the inner tube, and the filling gap is filled with silencing cotton.

8. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 7, characterized in that: The mufflers on the two muffler discs are staggered.

9. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 7, characterized in that: The disc body has a threaded hole corresponding to the muffler, and the outer wall of the outer tube has an external thread corresponding to the threaded hole.

10. The noise reduction structure for the ventilation duct of a passenger roll-on / roll-off ship according to claim 1, characterized in that: A heat insulation layer is sandwiched between the sound-absorbing channel and the sound-absorbing cotton layer.

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