Air pipe silencer for ship

Abstract

The utility model relates to the technical field of silencers, and discloses an air pipe silencer for a ship. In the utility model, the central anechoic chamber comprises a central anechoic chamber shell and a first anechoic layer fixedly connected inside the central anechoic chamber shell, a second anechoic layer is arranged on one side of the first anechoic layer close to the tapered anechoic chamber, and the silencer is fixedly connected with the pipe orifice of the air pipe through the flange plate. The air flow sequentially passes through the divergent anechoic chamber, the central anechoic chamber and the convergent anechoic chamber and finally flows out of the air supply pipe, when the air flow passes through the central anechoic chamber, the flow speed of the air flow is greatly reduced through cooperation of the first anechoic layer and the second anechoic layer, and meanwhile the anechoic effect is further improved under the action of the divergent anechoic chamber and the convergent anechoic chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of mufflers, in particular to a duct muffler for ships. Background Art

[0002] A muffler is a device used to reduce the sound intensity and change the sound characteristics. In the field of firearms, a muffler can significantly reduce the noise generated when a firearm is fired, making it more concealed; in the industrial field, large machinery and equipment in factories may also be equipped with mufflers to reduce the noise generated during operation, protect the hearing health of workers, and reduce noise pollution to the surrounding environment; in the transportation system, mufflers can effectively reduce noise, making vehicles and ships travel more quietly and comfortably.

[0003] The Chinese patent with the publication number CN215752976U discloses a duct muffler for ships. The air outlet of the ship duct is connected to the input end of the first-stage air duct through a flange. When the wind enters the first-stage air duct, the sound-absorbing layer can perform a primary noise reduction operation on the noise generated by the wind flow. At the same time, the wind pushes the movable plate to move, and the movable plate disengages from the output end of the first-stage air duct. The wind enters the second-stage air duct from the input end of the second-stage air duct, and the sound-absorbing plate can perform a secondary noise reduction operation on the noise generated by the wind flow, and finally discharges from the output end of the second-stage air duct, thus completing the noise reduction work of the ship pipeline.

[0004] However, in the above-mentioned prior art, the noise reduction effect through only two-stage noise reduction operations is relatively limited and cannot meet some scenarios with high noise reduction requirements on ships (such as the rest area of the passenger cabin).

[0005] Therefore, in order to solve such problems, we propose a duct muffler for ships. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a duct muffler for ships, aiming to solve the problem that the noise reduction effect of the existing technology through only two-stage noise reduction operations is relatively limited in the above-mentioned background art.

[0007] To achieve the above purpose, the utility model adopts the following technical scheme: A duct muffler for ships includes a flange and a gradually expanding muffler chamber installed on one side of the flange. The end of the gradually expanding muffler chamber away from the flange is fixedly connected to a central muffler chamber. The end of the central muffler chamber away from the gradually expanding muffler chamber is fixedly connected to a gradually shrinking muffler chamber. The end of the gradually shrinking muffler chamber away from the central muffler chamber is fixedly connected to an air supply duct. The central muffler chamber includes a central muffler chamber housing and a first sound-absorbing layer fixedly connected inside the central muffler chamber housing. A second sound-absorbing layer is arranged on the side of the first sound-absorbing layer close to the gradually shrinking muffler chamber, and the second sound-absorbing layer is fixedly connected to the inner wall of the central muffler chamber housing.

[0008] Preferably, the gradually expanding soundproof chamber includes a gradually expanding soundproof chamber outer shell and a first layer of sound-absorbing cotton installed on the inner wall of the gradually expanding soundproof chamber outer shell. One end of the gradually expanding soundproof chamber outer shell is fixedly connected to a flange, and the other end is fixedly connected to the central soundproof chamber outer shell.

[0009] Preferably, the gradually contracting soundproof chamber includes a gradually contracting soundproof chamber outer shell and a second layer of sound-absorbing cotton installed on the inner wall of the gradually contracting soundproof chamber outer shell. One end of the gradually contracting soundproof chamber outer shell is fixedly connected to the central soundproof chamber outer shell, and the other end is fixedly connected to an air supply pipe.

[0010] Preferably, the first soundproof layer includes a first fixing ring and a second fixing ring arranged on one side of the first fixing ring. Both the first fixing ring and the second fixing ring are fixedly connected to the inner wall of the central soundproof chamber outer shell, and a first porous partition is fixedly connected between the first fixing ring and the second fixing ring.

[0011] Preferably, the second soundproof layer includes a third fixing ring and a fourth fixing ring arranged on one side of the third fixing ring. Both the third fixing ring and the fourth fixing ring are fixedly connected to the inner wall of the central soundproof chamber outer shell. A plurality of springs are installed on the side of the fourth fixing ring close to the third fixing ring, and a second porous partition is fixedly connected to the end of the spring away from the fourth fixing ring.

[0012] Preferably, the holes of the first porous partition are smaller than those of the second porous partition, and the number of holes of the first porous partition is more than that of the second porous partition.

[0013] Preferably, the air supply pipe includes an air supply pipe outer shell and multiple groups of protrusions arranged on the inner wall of the air supply pipe outer shell. The protrusions are distributed in a spiral shape.

[0014] The utility model has the following beneficial effects:

[0015] In the utility model, the central soundproof chamber includes a central soundproof chamber outer shell and a first soundproof layer fixedly connected inside the central soundproof chamber outer shell. A second soundproof layer is arranged on the side of the first soundproof layer close to the gradually contracting soundproof chamber. The muffler is fixedly connected to the pipe orifice of the air duct through a flange. The air flow passes through the gradually expanding soundproof chamber, the central soundproof chamber, and the gradually contracting soundproof chamber in sequence, and finally flows out through the air supply pipe. On the way of passing through the central soundproof chamber, the cooperation of the first soundproof layer and the second soundproof layer greatly slows down the flow rate of the air flow. At the same time, under the action of the gradually expanding soundproof chamber and the gradually contracting soundproof chamber, the soundproof effect is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of a ship air duct muffler proposed by the utility model;

[0017] Figure 2 is a central cross-sectional schematic diagram of a ship air duct muffler proposed by the utility model;

[0018] Figure 3 A three-dimensional schematic diagram of the first sound insulation layer in a duct silencer for ships proposed by the present utility model;

[0019] Figure 4 A three-dimensional schematic diagram of the second sound insulation layer in a duct silencer for ships proposed by the present utility model;

[0020] Figure 5 A three-dimensional schematic diagram of the air supply duct in a duct silencer for ships proposed by the present utility model.

[0021] Legend:

[0022] 1. Flange; 2. Diverging sound insulation chamber; 21. Outer shell of the diverging sound insulation chamber; 22. First sound absorption cotton; 3. Central sound insulation chamber; 31. Outer shell of the central sound insulation chamber; 32. First sound insulation layer; 321. First fixing ring; 322. Second fixing ring; 323. First porous partition; 33. Second sound insulation layer; 331. Third fixing ring; 332. Fourth fixing ring; 333. Spring; 334. Second porous partition; 4. Converging sound insulation chamber; 41. Outer shell of the converging sound insulation chamber; 42. Second sound absorption cotton; 5. Air supply duct; 51. Outer shell of the air supply duct; 52. Protrusion. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. The terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] Please refer to Figure 1 and Figure 2 Figure 2 for an embodiment provided by the present utility model: a duct silencer for a ship, which includes a flange 1 and a gradually expanding silencing chamber 2 installed on one side of the flange 1. One end of the gradually expanding silencing chamber 2 away from the flange 1 is fixedly connected to a central silencing chamber 3. One end of the central silencing chamber 3 away from the gradually expanding silencing chamber 2 is fixedly connected to a gradually contracting silencing chamber 4. One end of the gradually contracting silencing chamber 4 away from the central silencing chamber 3 is fixedly connected to an air supply duct 5. The central silencing chamber 3 includes a central silencing chamber outer shell 31 and a first silencing layer 32 fixedly connected inside the central silencing chamber outer shell 31. A second silencing layer 33 is arranged on the side of the first silencing layer 32 close to the gradually contracting silencing chamber 4, and the second silencing layer 33 is fixedly connected to the inner wall of the central silencing chamber outer shell 31. The silencer is fixedly connected to the pipe orifice of the air duct through the flange 1. The air flow passes through the gradually expanding silencing chamber 2, the central silencing chamber 3, and the gradually contracting silencing chamber 4 in sequence, and finally flows out through the air supply duct 5. When the air flow passes through the central silencing chamber 3, the cooperation between the first silencing layer 32 and the second silencing layer 33 greatly slows down the flow rate of the air flow. At the same time, under the action of the gradually expanding silencing chamber 2 and the gradually contracting silencing chamber 4, the silencing effect is further improved.

[0026] Please refer to Figure 2 Figure 2 . The gradually expanding silencing chamber 2 includes a gradually expanding silencing chamber outer shell 21 and a first sound-absorbing cotton 22 installed on the inner wall of the gradually expanding silencing chamber outer shell 21. One end of the gradually expanding silencing chamber outer shell 21 is fixedly connected to the flange 1, and the other end of the gradually expanding silencing chamber outer shell 21 is fixedly connected to the central silencing chamber outer shell 31. By setting the expanding shape of the gradually expanding silencing chamber outer shell 21, the contact area between the air flow and the first sound-absorbing cotton 22 is increased, so that a part of the energy of the air flow is absorbed when the air flow just flows in.

[0027] Please refer to Figure 2 Figure 2 . The gradually contracting silencing chamber 4 includes a gradually contracting silencing chamber outer shell 41 and a second sound-absorbing cotton 42 installed on the inner wall of the gradually contracting silencing chamber outer shell 41. One end of the gradually contracting silencing chamber outer shell 41 is fixedly connected to the central silencing chamber outer shell 31, and the other end of the gradually contracting silencing chamber outer shell 41 is fixedly connected to the air supply duct 5. By setting the contracting shape of the gradually contracting silencing chamber outer shell 41, the contact area between the air flow and the second sound-absorbing cotton 42 is increased, so that a part of the energy of the air flow is absorbed when the air flow is about to flow out.

[0028] Please refer to Figure 3 Figure 3 . The first silencing layer 32 includes a first fixing ring 321 and a second fixing ring 322 arranged on one side of the first fixing ring 321. Both the first fixing ring 321 and the second fixing ring 322 are fixedly connected to the inner wall of the central silencing chamber outer shell 31. A porous partition plate 323 is fixedly connected between the first fixing ring 321 and the second fixing ring 322, and the porous partition plate 323 is used to make the air flow disperse and flow through, reducing the concentrated energy of the air flow.

[0029] Please refer toFigure 4 , the sound absorption layer two 33 includes a fixing ring three 331 and a fixing ring four 332 arranged on one side of the fixing ring three 331. Both the fixing ring three 331 and the fixing ring four 332 are fixedly connected to the inner wall of the central sound absorption chamber housing 31. A plurality of springs 333 are installed on the side of the fixing ring four 332 close to the fixing ring three 331. One end of the spring 333 far from the fixing ring four 332 is fixedly connected to a porous partition two 334. When the air flow velocity is too fast, the porous partition two 334 will translate in the direction close to the fixing ring four 332, increasing the distance between the porous partition one 323 and the porous partition two 334, playing a role in slowing down the air flow velocity. When the flow velocity decreases, the reset of the spring 333 keeps the porous partition one 323 and the porous partition two 334 at an appropriate distance all the time.

[0030] Please refer to Figure 3 , Figure 4 , the holes of the porous partition one 323 are smaller than those of the porous partition two 334, and the holes of the porous partition one 323 are more than those of the porous partition two 334. The small holes of the porous partition one 323 can effectively block and disperse higher-frequency sound waves, consuming sound energy through friction and viscous resistance. When the air flow and sound waves reach the large holes of the porous partition two 334 after the preliminary treatment by the porous partition one 323, the large holes have a good resistance and sound absorption effect on medium and low-frequency sound waves, and can also reduce the air flow resistance.

[0031] Please refer to Figure 5 , the air supply pipe 5 includes an air supply pipe housing 51 and multiple groups of protrusions 52 arranged on the inner wall of the air supply pipe housing 51. The protrusions 52 are distributed in a spiral shape. Distributing the protrusions 52 in a spiral shape on the inner wall of the air supply pipe housing 51 can make the air flow rotate when flowing out. On the one hand, it helps to evenly disperse the air flow, and on the other hand, it can also weaken the direct propagation of sound waves by rotation.

[0032] Working principle: The silencer is fixedly connected to the pipe orifice of the air duct through the flange 1. The air flow is successively reduced in energy by the sound absorption cotton one 22, the porous partition one 323, the porous partition two 334, the sound absorption cotton two 42, and the protrusions 52, and is output by the air supply pipe 5. After multiple layers of noise reduction, the sound absorption effect is obvious.

[0033] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A duct silencer for a ship, comprising a flange (1) and a gradually expanding silencing chamber (2) installed on one side of the flange (1). One end of the gradually expanding silencing chamber (2) away from the flange (1) is fixedly connected to a central silencing chamber (3). One end of the central silencing chamber (3) away from the gradually expanding silencing chamber (2) is fixedly connected to a gradually contracting silencing chamber (4). One end of the gradually contracting silencing chamber (4) away from the central silencing chamber (3) is fixedly connected to an air supply duct (5), characterized in that: The central anechoic chamber (3) includes a central anechoic chamber housing (31) and a first sound-absorbing layer (32) fixedly connected inside the central anechoic chamber housing (31). A second sound-absorbing layer (33) is provided on one side of the first sound-absorbing layer (32) close to the tapered anechoic chamber (4), and the second sound-absorbing layer (33) is fixedly connected to the inner wall of the central anechoic chamber housing (31).

2. The air duct silencer for a ship according to claim 1, wherein: The expanding anechoic chamber (2) includes an expanding anechoic chamber housing (21) and a first sound-absorbing cotton (22) installed on the inner wall of the expanding anechoic chamber housing (21). One end of the expanding anechoic chamber housing (21) is fixedly connected to the flange (1), and the other end of the expanding anechoic chamber housing (21) is fixedly connected to the central anechoic chamber housing (31).

3. The air duct silencer for a ship according to claim 1, characterized in that: The tapered anechoic chamber (4) includes a tapered anechoic chamber housing (41) and a second sound-absorbing cotton (42) installed on the inner wall of the tapered anechoic chamber housing (41). One end of the tapered anechoic chamber housing (41) is fixedly connected to the central anechoic chamber housing (31), and the other end of the tapered anechoic chamber housing (41) is fixedly connected to the air supply duct (5).

4. The air duct silencer for a ship according to claim 1, characterized in that: The first sound-absorbing layer (32) includes a first fixing ring (321) and a second fixing ring (322) provided on one side of the first fixing ring (321). Both the first fixing ring (321) and the second fixing ring (322) are fixedly connected to the inner wall of the central anechoic chamber housing (31), and a porous partition plate one (323) is fixedly connected between the first fixing ring (321) and the second fixing ring (322).

5. The air duct silencer for a ship according to claim 4, characterized in that: The second sound-absorbing layer (33) includes a third fixing ring (331) and a fourth fixing ring (332) provided on one side of the third fixing ring (331). Both the third fixing ring (331) and the fourth fixing ring (332) are fixedly connected to the inner wall of the central anechoic chamber housing (31). A plurality of springs (333) are installed on one side of the fourth fixing ring (332) close to the third fixing ring (331), and a porous partition plate two (334) is fixedly connected to the end of the spring (333) away from the fourth fixing ring (332).

6. The air duct silencer for a ship according to claim 5, characterized in that: The holes of the porous partition plate one (323) are smaller than those of the porous partition plate two (334), and the number of holes of the porous partition plate one (323) is more than that of the porous partition plate two (334).

7. A duct silencer for a ship according to claim 1, characterized in that: The air supply duct (5) includes an air supply duct housing (51) and multiple groups of protrusions (52) provided on the inner wall of the air supply duct housing (51), and the protrusions (52) are distributed in a spiral shape.

Images