Marine silencer with replaceable sound absorption core body
By designing an alternative sound-absorbing core structure and using technical means such as fixed spikes and rotating bearings, the problem of uneven filling and ineffective sound-absorbing core in marine mufflers is solved, and the performance and maintenance of mufflers are improved.
Patent Information
- Application Number
- CN202411923688.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-05-06
AI Technical Summary
During the processing and production process, existing marine mufflers are prone to the problem of uneven and unfixed filling of the sound absorbing core, and the deformation of the sound absorbing core after long-term use causes the muffler performance to decline and cannot be replaced.
A marine muffler with a sound absorbing core is designed, adopting an outer cylinder, an inner cylinder and a removable sound absorbing core structure. Fixed spikes are provided outside the inner cylinder to uniformly lay the sound absorbing core, and the sound absorbing core is conveniently disassembled, as well as rotating bearings and rotating handles.
The sound-absorbing core is uniformly laid and tightened in the muffler, which improves the maintenance, economy and service life of the muffler, while improving aerodynamic and acoustic performance.
Smart Images
Figure CN119943015A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of ship mufflers, and in particular relates to a ship muffler with a replaceable sound-absorbing core. Background Art
[0002] In recent years, as ships develop towards low noise, light weight, compactness and high power, ships have put forward higher requirements for the muffler performance, aerodynamic performance and reliability of marine mufflers. At present, marine mufflers mostly use fluffy and porous materials as filling materials for the sound-absorbing core, such as glass wool. Due to the particularity of ships, the size of marine mufflers is usually large (meter level), which makes the sound-absorbing core filled in the muffler larger in volume and heavier in weight, which brings considerable challenges to the production and processing of the muffler, and also has a certain impact on the reliability and maintainability of the muffler. In the production and processing of marine mufflers, there is a key step in the filling of the sound-absorbing core inside the muffler. There are usually two ways to fill the sound-absorbing core. The first way is to first process the overall frame of the muffler, and then divide the whole piece of sound-absorbing core into small pieces and fill it into the muffler cavity. The second way is to first process the inner cylinder of the muffler, and then lay the whole piece of sound-absorbing core directly on the inner cylinder and then cover the outer cylinder. The advantage of the first method is that the sound-absorbing core can be filled more tightly, but the disadvantage is that it is difficult to lay the sound-absorbing core evenly and make it fit tightly with the inner cylinder. The advantage of the second method is that the sound-absorbing core can be laid very evenly, but the disadvantage is that it is difficult to fill the sound-absorbing core tightly. When producing and processing marine silencers, due to the large overall size and the large amount of sound-absorbing material filled inside the silencer, no matter which of the above methods is used to lay the sound-absorbing core, it is difficult to make the sound-absorbing core fill the silencer cavity evenly and tightly, which will make it difficult for the produced silencer to achieve the designed silencer performance to a certain extent.
[0003] Normally, marine mufflers are not replaced unless they are seriously damaged after being installed on board. That is, marine mufflers will work with the ship for a long time at sea, and will be in a strong swaying and extremely humid working environment. This makes the glass wool in the sound-absorbing core of the muffler very easy to absorb water and become damp. Moisture will greatly increase the weight of the glass wool. Under the action of gravity, the glass wool filled in the muffler cavity will sag, which may cause the glass wool to no longer be tightly attached to the inner cylinder of the muffler, or may cause the glass wool to fall to the lower end of the muffler, so that the upper section of the muffler is no longer filled with glass wool, and a cavity will appear. Strong swaying at sea will aggravate the above problems, causing the glass wool to be severely deformed in other directions as well, which will greatly reduce the acoustic performance of the muffler.
[0004] The sound-absorbing core is mostly made of porous sound-absorbing materials, and its sound absorption performance is closely related to the porosity. In a humid environment, the moisture content of the sound-absorbing core will increase, causing its pores to become smaller or blocked, and the porosity to decrease, thus affecting its sound absorption performance. The water absorption rate of the sound-absorbing core may increase, which will affect its thermal insulation performance and may cause mold growth. The environmental performance of the sound-absorbing core may decrease due to aging, releasing more harmful substances. If the muffler is installed in the ventilation duct, the harmful substances released due to the aging of the sound-absorbing core will seriously affect the health of the crew. Generally, the space on the ship is compact, and the size of the muffler is large. It is difficult to replace the muffler as a whole after the ship is completed and launched. Therefore, the marine muffler is usually designed so that the internal sound-absorbing core does not need to be replaced and maintained. In fact, long-term use will bring the above-mentioned problems. Therefore, it is particularly important to design a muffler that can easily replace the internal sound-absorbing core of the muffler. Summary of the invention
[0005] In view of the above-mentioned deficiencies of the existing marine mufflers, the present invention provides a marine muffler with a replaceable sound-absorbing core, which can solve the problems of uneven and loose filling of the internal sound-absorbing core that are easy to occur in the processing and production process of the existing marine mufflers, as well as the problems of deformation of the internal sound-absorbing core and degradation of the muffler performance after long-term use while the sound-absorbing core cannot be replaced.
[0006] In order to achieve the above-mentioned purpose, the present invention provides a marine silencer with a replaceable sound-absorbing core, comprising an outer cylinder, an inner cylinder and a sound-absorbing core, wherein a mounting support is provided at the bottom of the outer cylinder; the inner cylinder is coaxially rotatably placed in the outer cylinder; the outer wall of the inner cylinder is axially provided with a plurality of rows of circumferentially evenly distributed fixing spikes; the sound-absorbing core comprises a plate-shaped waterproof cloth bag filled with sound-absorbing material; a cloth belt A is provided at the bottom of one end of the waterproof cloth bag, and a cloth belt B is provided at the top of the other end; an opening for laying the waterproof cloth bag is provided on the outer cylinder, and a cover plate is provided on the opening sealing bolt; the cloth belt A is pressed and embedded on a single row of the fixing spikes, and the cloth belt B is integrally pressed between the cover plate and the outer cylinder; the fixing spikes are embedded in the waterproof cloth bag and make the two end planes of the waterproof cloth bag abut against each other.
[0007] Furthermore, end plates are provided at both ends of the outer cylinder, and the outer ends of the end plates are integrally connected with flange rings with inlets and outlets; the inner cylinder is coaxially rotatably arranged between the two end plates.
[0008] Furthermore, a rotating bearing is provided between the end plate and the inner cylinder.
[0009] Furthermore, the outer walls at both ends of the inner cylinder are provided with rotating handles; the rotating handles are used to drive the inner cylinder to rotate and to disassemble and assemble the sound absorbing core; the sound absorbing core is laid between the two rotating handles.
[0010] Furthermore, the rotating handle comprises a circular ring, and the circular ring and the inner cylinder are welded together via a plurality of radial connecting rods; one of the connecting rods is provided with a U-shaped clamp, and the clamp is bolted and fixed to the inner wall of the end plate.
[0011] Furthermore, a plurality of screws distributed in a rectangular shape are fixedly provided at the opening of the outer cylinder; a plurality of the screws on one side of the opening of the outer cylinder pass through the cloth belt B; and the screws are fastened to the cover plate through nuts.
[0012] Furthermore, the cloth belt A is provided with mounting holes matching the single row of the fixing spikes; the cloth belt B is provided with fixing holes matching the corresponding plurality of the screws.
[0013] Furthermore, a sound absorbing body cavity for laying multiple layers of the sound absorbing core is provided between the outer cylinder and the inner cylinder.
[0014] Furthermore, a sealing ring is provided on the cover plate, and the sealing ring is located between the cover plate and the outer cylinder; the sealing ring is located on the outer side of the cloth belt B.
[0015] Furthermore, the inner cylinder is a tubular perforated plate.
[0016] The beneficial effects brought by the present invention are as follows:
[0017] 1. Fixed spikes for installing the sound-absorbing core are provided on the outside of the inner cylinder of the muffler. The evenly distributed fixed spikes enable the sound-absorbing core to be evenly laid on the inner cylinder of the muffler during the processing and production of the marine muffler. On the one hand, this ensures the flatness of the inner surface of the muffler, and on the other hand, it ensures that the sound-absorbing body cavity of the muffler can be evenly filled with the sound-absorbing material without large gaps.
[0018] 2. The integrated structure of the non-replaceable sound-absorbing core of the marine muffler has been modified. Rotating bearings and rotating handles have been added to both ends of the inner cylinder of the muffler, and an opening has been made on the outer cylinder of the muffler, equipped with a cover plate that is easy to disassemble and assemble. This allows maintenance personnel to easily open the cover plate to remove the old sound-absorbing core without disassembling the marine muffler body, and replace the new sound-absorbing core into the sound-absorbing body cavity of the marine muffler after the internal sound-absorbing material of the marine muffler has been damp, deformed, and aged due to the humid and swaying environment, without disassembling the marine muffler body.
[0019] In summary, the overall structure facilitates the uniform laying of the sound-absorbing core during the processing and production of the muffler, thereby improving the maintainability, economy, service life, and aerodynamic and acoustic performance of the marine muffler during use. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic diagram showing the structure of a marine muffler with a replaceable sound absorbing core according to the present invention;
[0021] Figure 2 Indicates the present invention Figure 1 Schematic diagram of the internal structure with the cover opened;
[0022] Figure 3 Indicates the present invention Figure 2 Schematic diagram of the structure of the middle inner cylinder;
[0023] Figure 4 Indicates the present invention Figure 1 Schematic diagram of the structure of the middle cover;
[0024] Figure 5 A schematic diagram showing the structure of a sound absorbing core of a marine muffler with a replaceable sound absorbing core according to the present invention.
[0025] In the figure, 1. inlet and outlet; 2. inner cylinder; 3. flange ring; 4. end plate; 5. cover plate; 6. screw; 7. nut; 8. outer cylinder; 9. mounting support; 10. fixing thorn; 11. sound absorbing body cavity; 12. rotating handle; 13. rotating bearing; 14. sealing ring; 15. cloth tape A; 16. waterproof cloth bag; 17. cloth tape B. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] Example
[0028] refer to Figures 1 to 5 As shown, the present invention provides a marine muffler with a replaceable sound-absorbing core, comprising an outer cylinder 8, an inner cylinder 2 and a sound-absorbing core, wherein a mounting support 9 is provided at the bottom of the outer cylinder 8; the inner cylinder 2 is coaxially rotatably placed in the outer cylinder 8; the outer wall of the inner cylinder 2 is axially provided with a plurality of rows of circumferentially evenly distributed fixed thorns 10; the sound-absorbing core comprises a plate-shaped waterproof cloth bag 16 filled with sound-absorbing material, that is, the sound-absorbing material is cut into a suitable shape as a whole and sewn into the waterproof cloth bag 16. A cloth belt A15 is provided at the bottom of one end of the waterproof cloth bag 16, and a cloth belt B17 is provided at the top of the other end; an opening for laying the waterproof cloth bag 16 is provided on the outer cylinder 8, and a cover plate 5 is provided on the opening sealing bolt.
[0029] When laying the sound-absorbing core, open the cover plate 5, manually rotate the inner cylinder 2, and the sound-absorbing core is laid along the circumference of the inner cylinder 2. The single-row fixed spikes 10 pass through the cloth belt A15 and are embedded in the waterproof bag 16 at one end of the cloth belt B17, so that the cloth belt A15 is pressed on the single-row fixed spikes 10, and the cloth belt B17 is pressed tightly between the cover plate 5 and the outer cylinder 8; the remaining fixed spikes 10 are embedded in the waterproof bag 16 and the two ends of the waterproof bag 16 are abutted, that is, the sound-absorbing core is laid in one layer along the circumference of the inner cylinder 2. At the same time, the whole is also convenient for the replacement of the sound-absorbing core, and the waterproof bag 16 improves the moisture-proof performance of the sound-absorbing material and improves the service life of the whole.
[0030] The form of the above-mentioned fixing thorn 10 is not fixed and is not limited to Figure 2 As shown, a row of columnar thorns are installed on the inner cylinder 2, that is, the lower section of the fixed thorn 10 is a cylinder, and the top is a cone with sharp thorns, which can pierce the sound-absorbing core; according to the size of the muffler, the specific application scenario, the difficulty of processing and other factors, the fixed thorns 10 in the form of serrated thorns, barbs, needle-shaped thorns, etc. can also be installed on the inner cylinder 2 to assist in fixing the sound-absorbing core in the muffler.
[0031] The cover plate 5 is provided with a sealing ring 14, which is located between the cover plate 5 and the outer cylinder 8; the sealing ring 14 is located on the outside of the cloth belt B17. The inner cylinder 2 is preferably a tubular perforated plate, which is also called a punching plate, to improve the acoustic silencing performance. The inner cylinder 2 can also be composed of multiple long strips of perforated plates, with a non-perforated partition plate spliced between every two perforated plates. A row of fixed spikes 10 of the sound-absorbing core is installed on the partition plate, which will not be described in detail.
[0032] The cover plate 5 not only seals the internal flow channel of the muffler, but also further fixes the sound absorbing core.
[0033] As an embodiment of the present invention, the outer walls of both ends of the inner cylinder 2 are provided with rotating handles 12; the sound absorbing core is laid between the two rotating handles 12. The rotating handles 12 facilitate manual operation and drive the inner cylinder 2 to rotate, so as to disassemble and assemble the sound absorbing core.
[0034] Specifically, the rotating handle 12 may include a ring, which is welded to the inner cylinder 2 through a plurality of radial connecting rods A; one of the connecting rods is provided with a U-shaped clamp, which is bolted and fixed to the inner wall of the end plate 4. The clamp is not shown in the figure, and a threaded hole is required on the end plate 4 to connect the clamp, and the clamp is located at the opening of the outer cylinder 8 for easy disassembly. The clamp can limit the rotation of the inner cylinder 2 in a rocking environment at sea, providing overall stability.
[0035] End plates 4 may be provided at both ends of the upper outer cylinder 8, and the outer ends of the end plates 4 are integrally connected with flange rings 3 with inlets and outlets 1; the inner cylinder 2 is coaxially rotatably arranged between the two end plates 4. The convenience of installation with related equipment is improved by the flange ring 3. Specifically, a rotating bearing 13 is provided between the end plate 4 and the inner cylinder 2. During production, the rotating bearing 13 is first limitedly installed on the end plate 4, and then the end plate 4 is welded to the outer cylinder 8. The inner cylinder 2 and the inner ring of the rotating bearing 13 are connected to the inner ring of the rotating bearing 13 by interference fit or sliding bolts, and finally the flange ring 3 is welded to the end plate 4 to limit the axial freedom of the inner cylinder 2, and the details are not repeated.
[0036] As an embodiment of the present invention, a plurality of screws 6 distributed in a rectangular shape are fixedly provided at the opening of the outer cylinder 8; a plurality of screws 6 on one side of the opening of the outer cylinder 8 pass through the cloth belt B17; and the screws 6 are fastened to the cover plate 5 through nuts 7.
[0037] The form of the cover plate 5 is not limited to Figure 4 As shown, the cover plate 5 is installed on the outer cylinder 8 of the muffler by means of screws 6 or bolts. The installation form of the cover plate 5 can be adjusted according to the specific use environment of the muffler. If the space around the muffler is small, the cover plate 5 can be designed as a circumferential sliding switch along the outer cylinder 8, or designed as an axial sliding switch along the outer cylinder 8. The details will not be repeated here.
[0038] In addition, the cloth tape A15 may be provided with mounting holes matching the single row of fixing spikes 10; the cloth tape B17 may be provided with fixing holes matching the corresponding plurality of screws 6, so as to facilitate the disassembly and assembly of the sound absorbing core. Figure 5 The whole sound absorbing core shown in the figure can also be designed into multiple pieces according to the actual application scenario and laid into the muffler separately.
[0039] A sound absorbing body cavity 11 for laying multiple layers of sound absorbing cores may be provided between the outer cylinder 8 and the inner cylinder 2. That is, the number of layers of the sound absorbing cores is not limited to Figure 5 A layer of sound absorbing core is shown in the figure. If the space of the sound absorbing body cavity 11 inside the muffler is large and the noise reduction performance of the muffler is required to be high, multiple layers of suitable sound absorbing cores can be designed and laid layer by layer into the sound absorbing body cavity 11 of the muffler.
[0040] In summary, the marine muffler produced by the above method can greatly improve the uniformity and compactness of the laying of the sound-absorbing core, so that the processed and produced marine muffler can meet the design indicators.
[0041] The present invention can not only improve the performance of the muffler during the processing and production of the muffler, but also improve the maintainability of the marine muffler. After the present invention has been working with the ship for a certain period of time, due to the harsh working environment of humidity and strong swaying at sea, the sound-absorbing material inside the marine muffler has problems such as moisture and aging. The cover plate 5 can be opened, the tight hoop can be untied, and the fixing hole of the cloth belt B17 on the sound-absorbing core can be removed from the screw 6. While turning the rotating handle 12 on the inner cylinder 2, the sound-absorbing core can be extracted from the sound-absorbing body cavity 11 of the muffler. Then, a new sound-absorbing core is taken out, and the steps of laying the sound-absorbing core in the processing and production process are repeated, and the new sound-absorbing core is laid into the sound-absorbing body cavity 11 of the marine muffler. The maintainability, economy, service life, and aerodynamic performance and acoustic performance of the marine muffler during use are improved as a whole. At the same time, the sound-absorbing core inside the muffler can be conveniently replaced in a small space, and it can be ensured that the sound-absorbing core is evenly and tightly filled in the sound-absorbing body cavity 11.
[0042] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.
Claims
1. A marine muffler with a replaceable sound-absorbing core, comprising an outer cylinder (8), an inner cylinder (2) and a sound-absorbing core, characterized in that: The bottom of the outer cylinder (8) is provided with a mounting support (9); the inner cylinder (2) is coaxially rotatably arranged inside the outer cylinder (8); the outer wall of the inner cylinder (2) is axially provided with a plurality of rows of circumferentially evenly distributed fixing spikes (10); the sound-absorbing core comprises a plate-shaped waterproof bag (16) filled with sound-absorbing material; a cloth belt A (15) is provided at the bottom of one end of the waterproof bag (16), and a cloth belt B (17) is provided at the top of the other end; an opening for laying the waterproof bag (16) is provided on the outer cylinder (8), and a cover plate (5) is provided on the opening for sealing and bolting; the cloth belt A (15) is pressed on a single row of the fixing spikes (10), and the cloth belt B (17) is integrally pressed between the cover plate (5) and the outer cylinder (8); the fixing spikes (10) are embedded in the waterproof bag (16) and the two end planes of the waterproof bag (16) are abutted.
2. The marine muffler with replaceable sound absorbing core according to claim 1, characterized in that: End plates (4) are provided at both ends of the outer cylinder (8), and the outer ends of the end plates (4) are integrally connected with flange rings (3) with inlets and outlets (1); the inner cylinder (2) is coaxially rotatably arranged between the two end plates (4).
3. The marine muffler with replaceable sound absorbing core according to claim 2, characterized in that: A rotary bearing (13) is provided between the end plate (4) and the inner cylinder (2).
4. The marine muffler with replaceable sound absorbing core according to claim 3, characterized in that: The outer walls at both ends of the inner cylinder (2) are provided with rotating handles (12); the rotating handles (12) are used to drive the inner cylinder (2) to rotate and to disassemble and assemble the sound absorbing core; the sound absorbing core is laid between the two rotating handles (12).
5. The marine muffler with replaceable sound absorbing core according to claim 4, characterized in that: The rotating handle (12) comprises a circular ring, and the circular ring and the inner cylinder (2) are welded together via a plurality of radial connecting rods A; one of the connecting rods is provided with a U-shaped clamp, and the clamp is bolted and fixed to the inner wall of the end plate (4).
6. The marine muffler with replaceable sound absorbing core according to claim 5, characterized in that: A plurality of screw rods (6) distributed in a rectangular shape are fixedly provided at the opening of the outer cylinder (8); a plurality of the screw rods (6) on one side of the opening of the outer cylinder (8) pass through the cloth belt B (17); and the screw rods (6) are fastened to the cover plate (5) via nuts (7).
7. The marine muffler with replaceable sound absorbing core according to claim 6, characterized in that: The cloth belt A (15) is provided with mounting holes matching the single row of fixing spikes (10); and the cloth belt B (17) is provided with fixing holes matching the corresponding plurality of screw rods (6).
8. The marine muffler with replaceable sound absorbing core according to claim 7, characterized in that: A sound absorbing body cavity (11) for laying multiple layers of the sound absorbing core is provided between the outer cylinder (8) and the inner cylinder (2).
9. The marine muffler with replaceable sound absorbing core according to claim 8, characterized in that: The cover plate (5) is provided with a sealing ring (14), and the sealing ring (14) is located between the cover plate (5) and the outer cylinder (8); the sealing ring (14) is located on the outside of the cloth belt B (17).
10. The marine muffler with replaceable sound absorbing core according to claim 1, characterized in that: The inner cylinder (2) is a tubular perforated plate.