Surface-cooled heat recovery muffler

Abstract

This invention discloses a surface-cooled heat recovery muffler, aiming to provide a surface-cooled heat recovery muffler with a simple structure, reduced surface temperature, and a more compact internal structure by utilizing the internal heat exchange chamber as a sound-absorbing baffle, thus improving the utilization rate of exhaust heat. The invention includes a pipe body, two sets of cooling chambers, and a heat exchange module. The heat exchange module includes two sets of internal heat exchange chambers and several sets of heat exchange water pipes. The two sets of cooling chambers are respectively located on both sides of the outer edge of the pipe body, and the two sets of internal heat exchange chambers are respectively located on both sides of the inner edge of the pipe body and connected to the corresponding cooling chambers. The several sets of heat exchange water pipes are located between the two sets of internal heat exchange chambers and connected to the two sets of cooling chambers, cooperating with the heat exchange water pipes when airflow passes through the pipe body. This invention applies to the technical field of pipeline silencing.

Description

Technical Field

[0001] This invention relates to the technical field of pipeline silencing, and particularly to a surface-cooled heat recovery silencer. Background Technology

[0002] Marine diesel engines, as the core power unit of ships, generate intense noise from their exhaust pipes, with peak noise levels reaching 130 dB(A). This is the primary source of noise pollution on ships, accounting for over 80% of engine room noise pollution. This noise includes low-frequency pressure pulsation noise, high-frequency eddy current noise, and jet noise, which not only harms the health of crew members but also causes noise pollution in the waterway and affects the ship's acoustic stealth performance. Therefore, mufflers have become an essential component of exhaust pipes. Traditional marine diesel engine exhaust pipe mufflers have high surface temperatures, requiring insulation, and the high heat from the exhaust cannot be recovered. Especially with high-speed diesel engines, the exhaust temperature is high, necessitating insulation of the muffler surface and requiring a strong ventilation system in the muffler compartment for heat dissipation, thus increasing shipbuilding costs. Furthermore, due to the extremely high surface temperature of the muffler, fuel leaks can easily cause fires, jeopardizing ship safety. The exhaust pipe carries away a significant amount of heat without utilizing it. If a surface-cooled heat recovery muffler with a simple structure, reduced surface temperature, and internal heat exchange chamber that doubles as a muffler baffle, making the muffler more compact and improving the utilization rate of exhaust heat can be designed, the above problems can be solved. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a surface-cooled heat recovery muffler with a simple structure, which reduces the surface temperature of the muffler, utilizes the internal heat exchange cavity as a muffler baffle, makes the muffler more compact, and improves the utilization rate of exhaust heat.

[0004] The technical solution adopted in this invention is as follows: This invention includes a pipe body, two sets of cooling chambers, and a heat exchange module. The heat exchange module includes two sets of inner heat exchange chambers and several sets of heat exchange water pipes. The two sets of cooling chambers are respectively arranged on both sides of the outer edge of the pipe body. The two sets of inner heat exchange chambers are respectively arranged on both sides of the inner edge of the pipe body and connected to the corresponding cooling chambers. The several sets of heat exchange water pipes are arranged between the two sets of inner heat exchange chambers and connected to the two sets of cooling chambers. When the airflow passes through the pipe body, it cooperates with the several sets of heat exchange water pipes.

[0005] Furthermore, each of the two sets of cooling chambers is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet and the cooling water outlet are connected and communicated with several sets of exchange water pipes through the cooling chambers and the two sets of internal heat exchange chambers.

[0006] Furthermore, a sound-absorbing module is provided on the inner edge of the tube, and the sound-absorbing module includes sound-absorbing cotton and a perforated plate.

[0007] Furthermore, the tube body is provided with an exhaust inlet and an exhaust outlet at both ends, respectively. The airflow enters the tube body cavity through the exhaust inlet, contacts the heat exchange module, and is discharged through the exhaust outlet.

[0008] Furthermore, the sound-absorbing cotton includes an inner sponge layer, a rubber and plastic heat-insulating sponge layer, a pearl cotton layer, and an aluminum foil layer, with one side of the inner sponge layer, the rubber and plastic heat-insulating sponge layer, the pearl cotton layer, and the aluminum foil layer attached to the inner edge of the cooling cavity.

[0009] Furthermore, the inner edge of the heat exchange water pipe is provided with a threaded groove, which engages with the cooling water as it passes through the heat exchange water pipe.

[0010] Furthermore, the perforated plate is bonded to the aluminum foil layer, and the perforated plate is provided with a plurality of through holes.

[0011] Furthermore, the spacing between adjacent sets of heat exchange water pipes is equal.

[0012] The beneficial effects of this invention are as follows: This application avoids the silencer emitting a large amount of heat to the environment, reduces the heat dissipation load of the compartment where the silencer is located, and thus allows the use of a lower air volume fan, thereby reducing the cost of compartment ventilation. Especially for high-speed ships, silencers are generally located in the jet pump room at the stern of the ship. This compartment is inherently small and cannot accommodate a large air volume fan, resulting in excessively high temperatures in the jet pump room during ship operation. This invention significantly reduces the surface temperature of the silencer, avoiding safety hazards caused by high surface temperatures. In this design, the internal heat exchange chamber is used as a sound-absorbing baffle, making the silencer more compact and improving the utilization rate of exhaust heat. After the exhaust passes through the silencer, the temperature is greatly reduced, which is beneficial to the working reliability of the exhaust pipe end through the compartment. The output hot water can be used for heating ship fuel, water production in the water maker, and cabin heating, thereby improving the ship's economy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the noise reduction module; Figure 3 This is a cross-sectional view of the sound-absorbing cotton; Figure 4 This is a plan view of the perforated plate. Detailed Implementation

[0014] like Figures 1 to 4As shown, in this embodiment, the present invention includes a pipe body 1, two sets of cooling chambers 2, and a heat exchange module 3. The heat exchange module 3 includes two sets of inner heat exchange chambers 31 and several sets of heat exchange water pipes 32. The two sets of cooling chambers 2 are respectively disposed on both sides of the outer edge of the pipe body 1. The two sets of inner heat exchange chambers 31 are respectively disposed on both sides of the inner edge of the pipe body 1 and connected to the corresponding cooling chambers 2. The several sets of heat exchange water pipes 32 are disposed between the two sets of inner heat exchange chambers 31 and connected to the two sets of cooling chambers 2. When the airflow passes through the pipe body 1, it cooperates with the several sets of heat exchange water pipes 32. Therefore, this application mainly consists of an outer wall cooling chamber, a sound-absorbing baffle that also serves as an inner heat exchange chamber, heat exchange water pipes, sound-absorbing cotton, a perforated plate, an exhaust inlet / outlet, and a cooling water inlet / outlet. The outer wall of the muffler is encased in the cooling water chamber, which significantly reduces the heat radiation emitted by the muffler to the environment; the internal heat exchange chamber of the muffler also serves as a sound-absorbing baffle, which not only increases the heat exchange efficiency but also plays a role in sound absorption; the heat exchange tubes inside the muffler increase the heat exchange efficiency and improve the recovery of exhaust heat; and the sound-absorbing cotton and perforated plate inside the muffler also improve the muffler's sound absorption capacity.

[0015] like Figure 1 As shown, in this embodiment, the two sets of cooling chambers 2 are respectively provided with cooling water inlets 4 and cooling water outlets 5. The cooling water inlets 4 and the cooling water outlets 5 are connected and communicate with each other through the cooling chambers 2 and the two sets of internal heat exchange chambers 31 and several sets of exchange water pipes 32. Therefore, the cooling water inlets 4 and the cooling water outlets 5 can be connected to an external circulation system to realize the circulation of cooling water.

[0016] like Figures 1 to 4 As shown, in this embodiment, a sound-absorbing module 6 is provided on the inner edge of the tube body 1. The sound-absorbing module 6 includes sound-absorbing cotton 61 and a perforated plate 62. Therefore, the sound-absorbing module 6 serves to insulate the inside of the tube body 1 and prevent heat from being conducted to the outside of the tube body 1.

[0017] like Figure 1 As shown, in this embodiment, the tube body 1 is provided with an exhaust inlet 7 and an exhaust outlet 8 at both ends. The airflow enters the cavity of the tube body 1 through the exhaust inlet 7, contacts the heat exchange module 3, and is discharged through the exhaust outlet 8. Thus, the airflow enters from the exhaust inlet 7 and flows out from the exhaust outlet 8, forming a gas flow.

[0018] like Figure 3As shown, in this embodiment, the sound-absorbing cotton 61 includes an inner sponge layer 611, a rubber-plastic thermal insulation sponge layer 612, a pearl cotton layer 613, and an aluminum foil layer 614. The inner sponge layer 611, the rubber-plastic thermal insulation sponge layer 612, the pearl cotton layer 613, and the aluminum foil layer 614 are attached to one side of the inner edge of the cooling cavity 2. Therefore, the multi-layer thermal insulation cotton structure provides better sound absorption.

[0019] like Figure 1 As shown, in this embodiment, the inner edge of the heat exchange water pipe 32 is provided with a threaded groove, which engages with the cooling water as it passes through the heat exchange water pipe 32. Therefore, the threaded groove increases the contact area between the cooling water and the inner wall of the heat exchange water pipe 32, resulting in higher heat absorption efficiency.

[0020] like Figure 2 and Figure 4 As shown, in this embodiment, the perforated plate 62 is bonded to the aluminum foil layer 614, and the perforated plate 62 is provided with a plurality of through holes 63.

[0021] like Figure 1 As shown, in this embodiment, the spacing between adjacent sets of heat exchange water pipes 32 is equal. Therefore, having the same spacing between several sets of heat exchange water pipes 32 allows for a smoother flow of air, reducing the likelihood of turbulence.

[0022] The working principle of this invention is as follows: When the marine diesel engine starts, the generated hot airflow flows into the pipe body 1 through the exhaust inlet 7, and the cooling water flows into several sets of heat exchange water pipes 32 through the cooling water inlet 4. When the hot airflow passes through several sets of heat exchange water pipes 32, it conducts heat to the cooling water and flows out through the cooling water outlet 5. The cooled airflow flows out through the exhaust outlet 8 and works with the muffler module 6 to achieve surface cooling heat recovery.

[0023] Although the embodiments of the present invention are described with reference to actual solutions, they do not constitute a limitation on the meaning of the present invention. Modifications to the embodiments and combinations with other solutions based on this specification will be obvious to those skilled in the art.

Claims

1. A surface-cooled heat recovery silencer, comprising a tube body (1), two sets of cooling chambers (2), and a heat exchange module (3), characterized in that: The heat exchange module (3) includes two sets of internal heat exchange chambers (31) and several sets of heat exchange water pipes (32). The two sets of cooling chambers (2) are respectively arranged on both sides of the outer edge of the pipe body (1). The two sets of internal heat exchange chambers (31) are respectively arranged on both sides of the inner edge of the pipe body (1) and connected to the corresponding cooling chambers (2). Several sets of heat exchange water pipes (32) are arranged between the two sets of internal heat exchange chambers (31) and connected to the two sets of cooling chambers (2). When the airflow passes through the pipe body (1), it cooperates with several sets of heat exchange water pipes (32).

2. The surface-cooled heat recovery silencer according to claim 1, characterized in that: The two sets of cooling chambers (2) are respectively provided with cooling water inlet (4) and cooling water outlet (5). The cooling water inlet (4) and the cooling water outlet (5) are connected to several sets of exchange water pipes (32) through the cooling chamber (2) and the two sets of internal heat exchange chambers (31).

3. The surface-cooled heat recovery silencer according to claim 1, characterized in that: The inner edge of the tube (1) is provided with a sound-absorbing module (6), which includes sound-absorbing cotton (61) and a perforated plate (62).

4. The surface-cooled heat recovery silencer according to claim 1, characterized in that: The tube body (1) is provided with an exhaust inlet (7) and an exhaust outlet (8) at both ends. The airflow enters the cavity of the tube body (1) through the exhaust inlet (7) and comes into contact with the heat exchange module (3) and is discharged through the exhaust outlet (8).

5. A surface-cooled heat recovery silencer according to claim 3, characterized in that: The sound-absorbing cotton (61) includes an inner sponge layer (611), a rubber and plastic heat-insulating sponge layer (612), a pearl cotton layer (613), and an aluminum foil layer (614). The inner sponge layer (611), the rubber and plastic heat-insulating sponge layer (612), the pearl cotton layer (613), and the aluminum foil layer (614) are attached to the inner edge of the cooling cavity (2) on one side.

6. A surface-cooled heat recovery silencer according to claim 1, characterized in that: The inner edge of the heat exchange water pipe (32) is provided with a threaded groove, and the cooling water enters the heat exchange water pipe (32) and cooperates with the threaded groove.

7. A surface-cooled heat recovery silencer according to claim 5, characterized in that: The perforated plate (62) is attached to the aluminum foil layer (614), and the perforated plate (62) is provided with a plurality of through holes (63).

8. A surface-cooled heat recovery silencer according to claim 1, characterized in that: The spacing between two adjacent sets of heat exchange water pipes (32) is equal.

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