Improved diesel engine silencer

Abstract

The utility model discloses an improved diesel engine silencer which comprises a shell, the upper end and the lower end of the shell are fixedly connected with an air outlet pipe and an air inlet pipe respectively, a first circulation pipe is arranged in the shell and located above the air inlet pipe, and a second circulation pipe is arranged in the shell and located on the outer side of the first circulation pipe. Three silencer cavities are formed in the shell through first circulating pipes and second circulating pipes, first sound absorbing materials are arranged on the surfaces of the silencer cavities, connecting pipes are fixedly connected to openings in the tops of the first circulating pipes and openings in the bottoms of the second circulating pipes, and small holes are formed in the connecting pipes to form perforated pipe structures. Every two adjacent silencer cavities are connected through a connecting pipe. Through the structure, a plurality of silencer cavities are formed among the second circulating pipe, the first circulating pipe and the inner wall of the shell, the flowing path of gas is increased, and when the gas flows in the silencer cavities, the first sound absorbing material can effectively absorb and reduce noise, so that the noise is reduced, and a good silencing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the muffler technical field, especially in a kind of improved diesel engine muffler. BACKGROUND

[0002] With the acceleration of industrialization and the acceleration of urbanization, noise pollution becomes a hot issue that people concern. Especially in some intensive land use, such as urban highway, airport, wharf and other public facilities diesel engine noise is very big, affecting the normal life of surrounding residents.

[0003] In the prior art, through retrieval, it is found that Chinese patent discloses "a muffler for diesel engine", its application number is "201621220276.1", the above-mentioned patent mainly includes shell, is provided with gas outlet on the upper part of shell, is provided with gas inlet below, is provided with left end cover on left side, is provided with right end cover on right side, is provided with sound-absorbing cover in shell;Among them, gas outlet is connected with gas outlet pipe, gas inlet is connected with gas inlet pipe, and a flue gas filtering device is installed between gas inlet pipe and gas inlet, the sound-absorbing cover divides the inner cavity of shell into left and right two inner cavities, left inner cavity is communicated with gas inlet pipe, right inner cavity is communicated with gas outlet pipe, and the left and right inner cavities of shell are filled with porous sound-absorbing material respectively. Although the above-mentioned muffler sets up porous sound-absorbing material and sound-absorbing cover in inner cavity, it has double-layer sound-absorbing and noise-reducing effect. However, when gas enters the sound-absorbing structure from the inside of gas inlet, the flow path is relatively short, and it is directly discharged after simply passing through sound-absorbing cover and porous sound-absorbing material, which may cause the sound wave not to be better interfered and offset in the transmission process, so that the sound-absorbing effect is limited. Especially in high speed or high load working condition, it may not fully play its sound-absorbing effect. Therefore, the utility model provides an improved diesel engine muffler to solve the problems in the above background technology. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an improved diesel engine muffler, which increases the flow path of gas, effectively absorbs and reduces noise through the first sound-absorbing material, thereby reducing noise and achieving good sound-absorbing effect.

[0005] To achieve the above-mentioned purpose, an improved diesel engine muffler is provided, which comprises a shell, the upper and lower ends of the shell are fixedly connected with a gas outlet pipe and a gas inlet pipe respectively, a first flow-through pipe is arranged inside the shell and above the gas inlet pipe, a second flow-through pipe is arranged inside the shell and outside the first flow-through pipe, three muffler cavities are formed in the shell through the first flow-through pipe and the second flow-through pipe, the surface of the muffler cavity is provided with first sound-absorbing material, the opening at the top of the first flow-through pipe and the opening at the bottom end of the second flow-through pipe are fixedly connected with a connecting pipe, a plurality of small holes are formed in the connecting pipe to form a perforated pipe structure, and every two adjacent muffler cavities are connected through the connecting pipe.

[0006] According to the improved diesel engine muffler, the inside of the outlet pipe is also provided with small holes to form a perforated pipe structure.

[0007] According to the improved diesel engine muffler, the inside of the small holes of the outlet pipe is provided with second sound-absorbing materials.

[0008] According to the improved diesel engine muffler, the shell is made of stainless steel.

[0009] According to the improved diesel engine muffler, the first sound-absorbing material and the second sound-absorbing material are made of glass fiber or ceramic fiber.

[0010] According to the improved diesel engine muffler, the upper and lower ends of the shell are provided with arc structures, and the top end of the second flow pipe is also provided with an arc structure.

[0011] The utility model has the advantages of:

[0012] 1. Compared with the prior art, the improved diesel engine muffler, the second flow pipe, the first flow pipe and the inner wall of the shell form a plurality of muffler cavities, and the flow path of the gas is increased. When the gas flows in the muffler cavity, the first sound-absorbing material covering the surface can effectively absorb and reduce noise, thereby reducing noise. The muffler cavities are communicated through the connecting pipes, and the small holes on the connecting pipes can make the gas flow better, thereby reducing the generation of noise and achieving good muffling effect.

[0013] 2. Compared with the prior art, the improved diesel engine muffler, when the exhaust gas is discharged through the outlet pipe, the small holes can make the gas flow through the holes, and the second sound-absorbing material filled in the small holes can further reduce the noise of the exhaust gas.

[0014] Additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further described below in combination with the drawings and examples;

[0016] Figure 1 It is whole structure schematic diagram of the utility model a kind of improved diesel engine muffler;

[0017] Figure 2 It is main view sectional structure schematic diagram of the utility model a kind of improved diesel engine muffler;

[0018] Figure 3The utility model relates to an improved diesel engine silencer Figure 2 Amplification structure schematic view in middle A;

[0019] Figure 4 The utility model relates to an improved diesel engine silencer Figure 2 Amplification structure schematic view in middle B.

[0020] Legend:

[0021] 1, shell; 2, air inlet pipe; 3, air outlet pipe; 4, first flow pipe; 5, second flow pipe; 6, second sound-absorbing material; 7, connecting pipe; 8, second sound-absorbing material; 9, small hole. Specific embodiments

[0022] This part will describe the specific embodiments of the utility model in detail, and the preferred embodiments of the utility model are shown in the drawings, and the drawings are used to supplement the description of the text part, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0023] Reference Figures 1-4 , the utility model discloses an improved diesel engine silencer, which comprises a shell 1, the upper and lower ends of the shell 1 are fixedly connected with air outlet pipes 3 and air inlet pipes 2 respectively, which are used for the exhaust gas introduction and discharge of the diesel engine. The first flow pipe 4 is arranged inside the shell 1 and above the air inlet pipe 2, the second flow pipe 5 is arranged inside the shell 1 and outside the first flow pipe 4, three silencer cavities are formed in the shell 1 through the first flow pipe 4 and the second flow pipe 5, the surfaces of the silencer cavities are all provided with first sound-absorbing materials 6, the openings at the top of the first flow pipe 4 and the openings at the bottom end of the second flow pipe 5 are all fixedly connected with connecting pipes 7, small holes 9 are formed in the connecting pipes 7 to form a perforated pipe structure, and every adjacent two silencer cavities are connected through the connecting pipe 7.

[0024] The first flow pipe 4 plays a role in guiding gas flow and also defines a first silencer cavity together with the inner wall of the shell 1. The second flow pipe 5 forms another two silencer cavities with the first flow pipe 4 and the inner wall of the shell 1, thereby increasing the gas flow path. When the gas flows inside the silencer cavities, the first sound-absorbing material 6 covering the surface can effectively absorb and reduce noise, thereby reducing noise. The silencer cavities are all communicated through the connecting pipe 7, and the small holes 9 on the connecting pipe 7 can make the gas flow better, thereby reducing the generation of noise and achieving good silencing effect.

[0025] The air outlet pipe 3 is also provided with small holes 9 to form a perforated pipe structure, and the small holes 9 inside the air outlet pipe 3 are all provided with second sound-absorbing materials 8.

[0026] When the discharged gas is discharged through the gas outlet pipe 3, the small holes 9 can make the gas flow dispersedly through the holes, thereby reducing the noise, and meanwhile the second sound-absorbing material 8 filled in the small holes 9 can further reduce the noise of the discharged gas.

[0027] The shell 1 is made of stainless steel material, so that the muffler has good corrosion resistance and high temperature resistance, the first sound-absorbing material 6 and the second sound-absorbing material 8 are both made of glass fiber or ceramic fiber, which can effectively absorb sound waves and reduce noise while having high temperature resistance.

[0028] In order to optimize the flow of the gas and reduce the resistance, the upper and lower ends of the shell 1 are both provided with arc-shaped structures, and the top end of the second flow pipe 5 is also provided with an arc-shaped structure, which is beneficial to the smooth flow of the gas, so as to reduce the generation of vortex and turbulent flow, thereby better reducing the noise.

[0029] Working principle: the first flow pipe 4 plays a role of guiding the flow of the gas, and together with the inner wall of the shell 1, defines a first muffler cavity. The second flow pipe 5, the first flow pipe 4 and the inner wall of the shell 1 form another two muffler cavities, which increase the flow path of the gas. When the gas flows in the muffler cavities, the first sound-absorbing material 6 covering the surface can effectively absorb and reduce the noise, thereby reducing the noise. The muffler cavities are all communicated through the connecting pipes 7, and the small holes 9 on the connecting pipes 7 can make the gas flow dispersedly, thereby reducing the generation of noise.

[0030] When the discharged gas is discharged through the gas outlet pipe 3, the small holes 9 can make the gas flow dispersedly through the holes, thereby reducing the noise, and meanwhile the second sound-absorbing material 8 filled in the small holes 9 can further reduce the noise of the discharged gas, thereby achieving good muffling effect.

[0031] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and within the knowledge range of ordinary skilled in the art, various changes can be made without departing from the purpose of the utility model.

Claims

1. An improved diesel engine muffler, characterized in that: The invention comprises a shell (1), wherein the upper and lower ends of the shell (1) are respectively fixedly connected to an air outlet pipe (3) and an air inlet pipe (2), a first flow pipe (4) is provided inside the shell (1) and located above the air inlet pipe (2), a second flow pipe (5) is provided inside the shell (1) and located outside the first flow pipe (4), three muffler cavities are formed inside the shell (1) through the first flow pipe (4) and the second flow pipe (5), the surfaces of the muffler cavities are provided with a first sound-absorbing material (6), the opening at the top of the first flow pipe (4) and the opening at the bottom of the second flow pipe (5) are fixedly connected to a connecting pipe (7), the inside of the connecting pipe (7) is provided with a small hole (9) to form a perforated pipe structure, and each two adjacent muffler cavities are connected by the connecting pipe (7).

2. The improved diesel engine muffler according to claim 1, characterized in that: A small hole (9) is also provided inside the air outlet pipe (3) to form a perforated pipe structure.

3. The improved diesel engine muffler according to claim 2, characterized in that: The small holes (9) inside the air outlet pipe (3) are all provided with a second sound-absorbing material (8).

4. The improved diesel engine muffler according to claim 3, characterized in that: The housing (1) is made of stainless steel.

5. The improved diesel engine muffler according to claim 4, characterized in that: The first sound-absorbing material (6) and the second sound-absorbing material (8) are both made of glass fiber or ceramic fiber.

6. The improved diesel engine muffler according to claim 1, characterized in that: The upper and lower ends of the shell (1) are both configured as arc-shaped structures, and the top end of the second flow tube (5) is also configured as an arc-shaped structure.

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