A diesel engine exhaust pipe heat insulation and noise reduction device

Abstract

This utility model relates to the field of diesel engine technology and discloses a diesel engine exhaust pipe heat insulation and noise reduction device, including a housing, an exhaust pipe installed in a mounting hole, and several mounting slots evenly spaced circumferentially on the inner surface of the housing. Each mounting slot contains a noise reduction component, which includes a mounting block disposed in the mounting slot. An arc-shaped plate is fixedly connected to the outside of the mounting block, and a partition is provided on the outside of the arc-shaped plate. Sound-absorbing cotton is provided on both sides of the partition, and a protective plate is provided on the outside of the sound-absorbing cotton. This utility model uses independent mounting slots circumferentially on the inner surface of the housing, with the noise reduction component embedded in the slot by the mounting block. The sound-absorbing cotton is sealed between the arc-shaped plate and the protective plate by a bolt-fixed protective plate. During maintenance, only the bolts need to be removed to remove the entire noise reduction component, allowing direct cleaning or replacement of the sound-absorbing cotton and carbon deposits on the partition. This achieves efficient maintenance of the complex internal flow channels and sound-absorbing materials without damaging the structure, significantly extending the device's lifespan and maintaining stable noise reduction performance.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine technology, specifically to a diesel engine exhaust pipe heat insulation and noise reduction device. Background Technology

[0002] A diesel engine is an internal combustion engine that uses diesel fuel. It generates high temperatures by compressing air, causing the injected diesel fuel to ignite and produce power. Its core characteristic is compression ignition, which results in high thermal efficiency, high torque, and strong durability. It is widely used in ships, trucks, generator sets, and other fields.

[0003] During the exhaust process, the exhaust pipe of existing diesel engines generates strong noise due to combustion pulsation and high-speed turbulence. It is necessary to install a muffler to reduce the noise level. However, a large number of impurities contained in the exhaust will accumulate inside the muffler during long-term operation, causing blockage of the airflow channel and failure of the sound-absorbing material. Since the existing muffler adopts a closed integrated structure, its complex internal cavity and partition cannot be effectively cleaned, which ultimately affects the muffler performance and service life. Utility Model Content

[0004] The purpose of this utility model is to provide a heat insulation and noise reduction device for diesel engine exhaust pipes, which solves the problem that existing mufflers adopt a closed integrated structure, and their complex internal cavities and partitions cannot be effectively cleaned.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a heat insulation and noise reduction device for a diesel engine exhaust pipe, comprising a housing, a cover installed at one end of the housing, and an intake pipe at the other end, with a connecting flange at the end of the intake pipe, an installation hole on the outer side of the cover for installing the exhaust pipe, and several mounting grooves equidistantly spaced on the inner surface of the housing, each mounting groove containing a noise reduction component, the noise reduction component including a mounting block disposed in the mounting groove, an arc-shaped plate fixedly connected to the outer side of the mounting block, a partition on the outer side of the arc-shaped plate, sound-absorbing cotton on both sides of the partition, and a protective plate on the outer side of the sound-absorbing cotton.

[0007] Furthermore, the partition is multiple and is distributed obliquely along the surface of the arc-shaped plate, the guard plate is fixedly connected to the arc-shaped plate by bolts, and the sound-absorbing cotton is sandwiched between the guard plate and the arc-shaped plate.

[0008] Furthermore, the sound-absorbing cotton is made of ceramic fiber, and the surface of the protective plate has several perforations.

[0009] Furthermore, a number of heat dissipation fins are provided at equal intervals around the outer side of the outer shell.

[0010] Furthermore, a number of reinforcing plates are fixedly connected between the outer shell and the air intake pipe, and the reinforcing plates are equidistantly distributed around the air intake pipe.

[0011] Furthermore, a positioning hole is provided at the upper end of the outer shell, and a positioning block is provided at the lower end of the cover, the positioning block being inserted into the positioning hole.

[0012] This utility model has the following beneficial effects:

[0013] (1) This utility model has an independent mounting groove set circumferentially on the inner surface of the shell. The noise reduction component is embedded in the groove by the mounting block. The sound-absorbing cotton is sealed between the arc plate and the protective plate by the bolt-fixed protective plate. During maintenance, the noise reduction component can be taken out as a whole by simply removing the bolts. The sound-absorbing cotton and carbon deposits on the partition can be cleaned or replaced directly. This achieves efficient maintenance of the complex internal flow channels and sound-absorbing materials without damaging the structure, significantly extending the life of the device and maintaining stable noise reduction performance.

[0014] (2) This utility model forms a triangular truss structure by means of reinforcing plates that are equidistantly distributed around the air pipe, which significantly improves the bending stiffness at the connection between the air pipe and the outer shell, offsets the alternating stress caused by exhaust pulsation, prevents weld fatigue cracking, and maintains the airflow channel seal.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is an exploded view of the overall structure of this utility model;

[0020] Figure 4 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle;

[0021] Figure 5 This is an exploded view of the noise reduction component structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the overall structure of this utility model during assembly;

[0023] The attached diagram lists the components represented by each number as follows:

[0024] In the diagram: 1. Outer shell; 101. Mounting slot; 102. Heat dissipation fins; 103. Positioning hole; 2. Cover; 201. Positioning block; 3. Inlet pipe; 4. Connecting flange; 5. Reinforcing plate; 6. Exhaust pipe; 7. Noise reduction component; 701. Mounting block; 702. Arc plate; 703. Partition plate; 704. Sound-absorbing cotton; 705. Protective plate; 706. Perforation. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-6 As shown, this utility model is a diesel engine exhaust pipe heat insulation and noise reduction device, including a shell 1, a cover 2 installed at one end of the shell 1, an intake pipe 3 at the other end, a connecting flange 4 at the end of the intake pipe 3, an installation hole opened on the outside of the cover 2, an exhaust pipe 6 installed in the installation hole, and a plurality of installation grooves 101 are equidistantly opened on the inner surface of the shell 1, each installation groove 101 is provided with a noise reduction component 7, the noise reduction component 7 includes an installation block 701, the installation block 701 is disposed in the installation groove 101, an arc plate 702 is fixedly connected to the outside of the installation block 701, a partition 703 is provided on the outside of the arc plate 702, sound-absorbing cotton 704 is provided on both sides of the partition 703, and a protective plate 705 is provided on the outside of the sound-absorbing cotton 704.

[0027] Both the mounting groove 101 and the mounting block 701 are T-shaped.

[0028] Multiple partitions 703 are distributed obliquely along the surface of the arc plate 702. The guard plate 705 is fixedly connected to the arc plate 702 by bolts. The sound-absorbing cotton 704 is sandwiched between the guard plate 705 and the arc plate 702.

[0029] The noise reduction component 7 is embedded in the groove by the mounting block 701, and the sound-absorbing cotton 704 is encapsulated between the arc plate 702 and the protective plate 705 by the bolt-fixed protective plate 705. During maintenance, the noise reduction component 7 can be removed as a whole by simply removing the bolts, and the sound-absorbing cotton 704 and the carbon deposits on the partition plate 703 can be directly cleaned or replaced. This achieves efficient maintenance of the complex internal flow channels and sound-absorbing materials without damaging the structure, significantly extending the life of the device and maintaining stable noise reduction performance.

[0030] The sound-absorbing cotton 704 is made of ceramic fiber, and the protective plate 705 has several perforations 706 on its surface;

[0031] Among them, the ceramic fiber material has high temperature resistance properties that can withstand the continuous thermal shock of diesel engine exhaust, avoiding high temperature embrittlement failure. At the same time, the porous fiber structure dissipates broadband sound energy through friction.

[0032] By constructing a micro-perforated sound-absorbing structure through the perforations 706 on the surface of the protective plate 705, sound waves can be efficiently penetrated into the deep layer of the sound-absorbing cotton 704. At the same time, the protective plate 705 physically blocks the airflow from directly scouring the sound-absorbing cotton 704, preventing fiber peeling and blockage of the flow channel, thus achieving dual protection of acoustic performance and material life.

[0033] A number of heat dissipation fins 102 are provided at equal intervals around the outer side of the outer casing 1;

[0034] Among them, the heat dissipation area of ​​the outer shell 1 is greatly increased by the circumferentially equidistant distribution of the heat dissipation fins 102, and the forced convective airflow forms a vortex along the inclined surface of the heat dissipation fins 102 to enhance heat transfer, so that the heat of the exhaust gas transferred to the outer shell 1 can be quickly dissipated, effectively suppressing thermal stress deformation and extending the life of the internal sound-absorbing cotton 704.

[0035] A number of reinforcing plates 5 are fixedly connected between the outer shell 1 and the air intake pipe 3. The reinforcing plates 5 are equidistantly distributed around the air intake pipe 3 in a circumferential direction.

[0036] Among them, the reinforcing plates 5, which are equidistantly distributed around the intake pipe 3, form a triangular truss structure, which significantly improves the bending stiffness at the connection between the intake pipe 3 and the outer shell 1, offsets the alternating stress caused by exhaust pulsation, prevents weld fatigue cracking, and maintains the airflow channel seal.

[0037] A positioning hole 103 is provided at the upper end of the outer shell 1, and a positioning block 201 is provided at the lower end of the cover 2. The positioning block 201 is inserted into the positioning hole 103.

[0038] Among them, the radial alignment of the cover 2 and the outer shell 1 is achieved through the plug-in positioning structure of the positioning block 201 and the positioning hole 103. During assembly, the positioning block 201 is automatically inserted into the positioning hole 103 to form over-constraint, eliminating the assembly deviation before the bolts are tightened.

[0039] When in use, first push the T-shaped mounting blocks 701 of each noise reduction component 7 into the housing 1 along the corresponding mounting groove 101 to complete the positioning and assembly. Then, align the positioning block 201 of the cover 2 with the positioning hole 103 of the housing 1 and press it down to achieve radial automatic centering. Then tighten the circumferential bolts to form a sealed cavity. Finally, fix the device to the diesel engine exhaust manifold through the connecting flange 4.

[0040] During operation, high-temperature exhaust gas enters the cavity of the outer shell 1 through the intake pipe 3. After being refracted and diffused multiple times by the inclined baffle 703, the sound wave energy is absorbed by the sound-absorbing cotton 704. Finally, the exhaust gas with reduced noise is discharged through the exhaust pipe 6. At the same time, the heat dissipation area of ​​the outer shell 1 is greatly increased by the circumferentially equidistant distribution of the heat dissipation fins 102. The forced convection airflow forms a vortex along the inclined surface of the heat dissipation fins 102 to enhance heat transfer, and the heat conducted by the exhaust gas to the outer shell 1 is quickly dissipated, effectively suppressing thermal stress deformation and extending the life of the internal sound-absorbing cotton 704.

[0041] When it is necessary to clean or replace the noise reduction component 7, loosen the circumferential fastening bolts of the cover 2 to release the sealing pressure, lift the cover 2 to disengage the positioning block 201 from the positioning hole 103, and then remove the top cover of the outer shell 1. At this time, each noise reduction component 7 can be directly slid outward along the T-shaped mounting groove 101 to remove the noise reduction component 7. Then the sound-absorbing cotton 704 and the partition 703 can be cleaned or replaced. After maintenance, reassemble in reverse order to restore use.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A diesel exhaust pipe heat insulation and noise reduction device, comprising a shell (1), one end of which is provided with a cover (2), and the other end is provided with an air inlet pipe (3), the end of the air inlet pipe (3) is provided with a connecting flange (4), and the outer side of the cover (2) is provided with a mounting hole, and an exhaust pipe (6) is mounted in the mounting hole, characterized in that: The inner surface of the outer shell (1) is provided with several mounting slots (101) at equal intervals in the circumferential direction, and each mounting slot (101) is provided with a noise reduction component (7); The noise reduction component (7) includes a mounting block (701), which is located in a mounting groove (101). An arc-shaped plate (702) is fixedly connected to the outside of the mounting block (701). A partition (703) is provided on the outside of the arc-shaped plate (702). Sound-absorbing cotton (704) is provided on both sides of the partition (703). A protective plate (705) is provided on the outside of the sound-absorbing cotton (704).

2. The diesel engine exhaust pipe heat insulation and noise reduction device according to claim 1, characterized in that: The partition (703) consists of multiple partitions that are inclinedly distributed along the surface of the arc plate (702). The guard plate (705) is fixedly connected to the arc plate (702) by bolts. The sound-absorbing cotton (704) is sandwiched between the guard plate (705) and the arc plate (702).

3. The diesel engine exhaust pipe heat insulation and noise reduction device according to claim 2, characterized in that: The sound-absorbing cotton (704) is made of ceramic fiber, and the protective plate (705) has several perforations (706) on its surface.

4. The diesel engine exhaust pipe heat insulation and noise reduction device according to claim 1, characterized in that: The outer shell (1) is provided with several heat dissipation fins (102) at equal intervals around its outer periphery.

5. The diesel engine exhaust pipe heat insulation and noise reduction device according to claim 1, characterized in that: A number of reinforcing plates (5) are fixedly connected between the outer shell (1) and the air intake pipe (3), and the reinforcing plates (5) are equidistantly distributed around the air intake pipe (3).

6. The diesel engine exhaust pipe heat insulation and noise reduction device according to claim 1, characterized in that: The upper end of the outer shell (1) has a positioning hole (103), and the lower end of the cover (2) has a positioning block (201), which is inserted into the positioning hole (103).

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