Low-noise exhaust manifold of small gasoline generating set

Abstract

The utility model discloses a low-noise exhaust manifold of a small gasoline generating set. The low-noise exhaust manifold comprises an air inlet pipe. One end of the branch pipe is provided with an integrated fixed pipe head; the noise reduction part is mounted between the branch pipe and the air inlet pipe and comprises a connecting pipe head in screwed connection with the fixed pipe head through threads, a noise reduction pipe integrally cast and formed with the connecting pipe head, an inner sound absorption pipe combined with the noise reduction pipe in a split manner, an air outlet pipe communicated with the interior of the inner sound absorption pipe, and an exhaust cylinder communicated with the air outlet pipe; the inner sound absorption pipe is mounted in the noise reduction pipe; the exhaust manifold is provided with a noise reduction design capable of dispersing waste gas and absorbing and dissipating sound waves, when the waste gas in the branch pipe is exhausted, the waste gas is shunted, flows through the gas outlet pipe, then enters the inner sound absorption pipe and then is exhausted after entering the gas inlet pipe, and the purpose that the waste gas flow is divided into multiple strands is achieved. The purposes of absorbing and dissipating sound wave energy, reducing airflow speed and reducing noise are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust component technology, specifically relating to a low-noise exhaust manifold for a small gasoline generator set. Background Technology

[0002] The exhaust manifold is an important component of a gasoline generator set. It is connected to the engine block of the gasoline generator set and is mainly used to collect the exhaust gas discharged from each cylinder of the engine and guide it into the exhaust pipe. It has the functions of collecting exhaust gas, guiding exhaust gas, optimizing exhaust efficiency and reducing emissions.

[0003] When exhausting gas, the exhaust gas enters the exhaust manifold and then exits into the exhaust pipe. The exhaust gas entering the exhaust manifold will generate noise. Although the noise can be reduced by applying sound-absorbing coating materials, the exhaust gas entering the exhaust manifold will create airflow impact between the exhaust gas and the pipe. The exhaust gas is not diverted, and the diverted gas cannot be used to reduce noise and dissipate the sound wave energy of the gas. This is a shortcoming.

[0004] Existing exhaust manifolds lack noise reduction design capabilities to disperse exhaust gases and absorb and dissipate sound waves during exhaust gas transport. To address this, this application proposes a low-noise exhaust manifold for small gasoline generator sets. Utility Model Content

[0005] The purpose of this invention is to provide a low-noise exhaust manifold for a small gasoline generator set, in order to solve the problem of noise reduction design in the exhaust manifold mentioned in the background art, which lacks the ability to disperse exhaust gas and absorb and dissipate sound waves.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-noise exhaust manifold for a small gasoline generator set, including an intake pipe;

[0007] A branch pipe, one end of which is equipped with an integrated fixed pipe head;

[0008] The noise reduction component installed between the branch pipe and the intake pipe includes a connecting pipe head that is threadedly connected to the fixed pipe head, a noise reduction pipe integrally cast with the connecting pipe head, an inner sound-absorbing pipe that is separately combined with the noise reduction pipe, an exhaust pipe that communicates with the inside of the inner sound-absorbing pipe, and an exhaust cylinder that communicates with the exhaust pipe. The inner sound-absorbing pipe is installed inside the noise reduction pipe. A concave air collection groove is formed on the surface of one end of the inner sound-absorbing pipe, and an exhaust channel communicating with the air collection groove is formed on the surface of the other end of the inner sound-absorbing pipe. The exhaust pipe communicates with the corresponding exhaust channel.

[0009] The guide includes a fixed post located at the center and guide plates evenly distributed on the outer surface of the fixed post.

[0010] Preferably, a sound-absorbing cylinder is installed between the inner sound-absorbing tube and the noise-reducing tube, and the sound-absorbing cylinder is fixed to the inner sound-absorbing tube and the noise-reducing tube by adhesive.

[0011] Preferably, the inner surface of the noise-reducing tube and the outer surface of the inner sound-absorbing tube are coated with a first sound-absorbing coating.

[0012] Preferably, the inner surface of the inner sound-absorbing tube is coated with a second sound-absorbing coating.

[0013] Preferably, the side surface of the guide plate away from the fixed post is in contact with the inner surface of the inner sound-absorbing tube, and one end of the fixed post has a conical structure.

[0014] Preferably, one end of the exhaust cylinder is tapered, the end of the exhaust cylinder near the outlet pipe is sealed, one end of the outlet pipe is embedded inside the exhaust cylinder, and the inner surface of the outlet pipe is coated with a third sound-absorbing coating.

[0015] Preferably, the central axes of the noise reduction tube, the connecting tube head, the fixing tube head, and the exhaust cylinder are on the same axis, and one end of the exhaust cylinder is inserted into the interior of the fixing tube head.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In this invention, the exhaust manifold has a noise reduction design that disperses exhaust gas and absorbs and dissipates sound waves. When the exhaust gas in the manifold is discharged, the exhaust gas is diverted and flows through the outlet pipe and then enters the inner sound absorption pipe, and then enters the inlet pipe and is discharged. This achieves the purpose of dividing the exhaust gas flow into multiple streams, thereby absorbing and dissipating sound wave energy, reducing airflow speed, and reducing noise. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a side view of the intake pipe of this utility model.

[0020] Figure 3 This is a top view schematic diagram of the separate air intake pipe and inner sound absorption pipe of this utility model;

[0021] Figure 4 For the present utility model Figure 3 Enlarged structural diagram of section A in the middle;

[0022] Figure 5 This is a side view of the air outlet pipe of this utility model.

[0023] In the diagram: 1. Branch pipe; 2. Intake pipe; 3. Noise reduction pipe; 4. Connecting pipe head; 5. Inner sound-absorbing pipe; 6. Sound-absorbing cylinder; 7. First sound-absorbing coating; 9. Exhaust cylinder; 11. Fixed pipe head; 51. Second sound-absorbing coating; 52. Exhaust channel; 53. Air collection groove; 54. Exhaust pipe; 81. Fixed column; 82. Guide plate; 541. Third sound-absorbing coating. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0025] Please see Figures 1 to 5 This utility model provides a technical solution: a low-noise exhaust manifold for a small gasoline generator set, including an intake pipe 2; a branch pipe 1, one end of which is provided with an integral fixed pipe head 11. The branch pipe 1 and the fixed pipe head 11 are integrally cast. The branch pipe 1, the intake pipe 2, and the noise reduction component form a complete exhaust manifold for the emission of exhaust gas; the noise reduction component installed between the branch pipe 1 and the intake pipe 2 includes a connecting pipe head 4 connected to the fixed pipe head 11 by a threaded connection, a noise reduction pipe 3 integrally cast with the connecting pipe head 4, an inner sound-absorbing pipe 5 separately combined with the noise reduction pipe 3, an exhaust pipe 54 communicating with the interior of the inner sound-absorbing pipe 5, and an exhaust cylinder 9 communicating with the exhaust pipe 54. The exhaust pipe 54 and the inner sound-absorbing pipe 5 are firmly bonded with strong adhesive. The inner sound-absorbing pipe 5 is installed inside the noise reduction pipe 3. The exhaust cylinder 9 passes through the connecting pipe head 4 and is inserted into the interior of the fixed pipe head 11. The exhaust pipes 54 are evenly distributed on the inner sound-absorbing pipe 5. When the exhaust gas in pipe 1 is discharged, the exhaust gas is diverted and flows through the outlet pipe 54 and then into the inner sound-absorbing pipe 5, and then into the inlet pipe 2 before being discharged. The diameter of the outlet pipe 54 is smaller than that of the inner sound-absorbing pipe 5 and the inlet pipe 2, so as to achieve the purpose of dividing the exhaust gas flow into multiple streams, thereby reducing the airflow speed and noise. The inner sound-absorbing pipe 5 and the outlet pipe 54 are made of sound-absorbing material, such as ceramic fiber, to absorb vibration and noise. A concave air-collecting groove 53 is opened on the surface of one end of the inner sound-absorbing pipe 5, and an exhaust channel 52 communicating with the air-collecting groove 53 is opened on the surface of the other end of the inner sound-absorbing pipe 5. The outlet pipe 54 is connected to the corresponding exhaust channel 52, and the exhaust gas flow in the inner sound-absorbing pipe 5 can enter the interior of the outlet pipe 54 along the exhaust channel 52. The guide component includes a fixed column 81 located at the center and guide plates 82 evenly distributed on the outer surface of the fixed column 81. The fixed column 81 and the guide plates 82 have the effect of diverting the airflow and reducing the noise generated by the airflow impact.

[0026] In this embodiment, a sound-absorbing cylinder 6 is installed between the inner sound-absorbing pipe 5 and the noise-reducing pipe 3. The sound-absorbing cylinder 6 is glued and fixed to the inner sound-absorbing pipe 5 and the noise-reducing pipe 3. The sound-absorbing cylinder 6 is made of sound-absorbing material, such as glass fiber, to achieve the effect of absorbing and reducing noise.

[0027] In this embodiment, the inner surface of the noise reduction tube 3 and the outer surface of the inner sound-absorbing tube 5 are coated with a first sound-absorbing coating 7, and the inner surface of the inner sound-absorbing tube 5 is coated with a second sound-absorbing coating 51. The first sound-absorbing coating 7 and the second sound-absorbing coating 51 are made of high-temperature resistant sound-absorbing materials, such as ceramic-based sound-absorbing coatings, which have good sound absorption performance and can absorb and dissipate sound wave energy to reduce noise propagation.

[0028] In this embodiment, the side surface of the guide plate 82 away from the fixed post 81 is attached to the inner surface of the inner sound-absorbing tube 5. One end of the fixed post 81 has a conical structure. The fixed post 81 and the guide plate 82 have the effect of diverting airflow and reducing the noise generated by airflow impact.

[0029] In this embodiment, one end of the exhaust cylinder 9 is tapered, and the end of the exhaust cylinder 9 near the exhaust pipe 54 is sealed. One end of the exhaust pipe 54 is embedded inside the exhaust cylinder 9. The exhaust gas discharged from the exhaust pipe 54 is discharged through the exhaust cylinder 9. The inner surface of the exhaust pipe 54 is coated with a third sound-absorbing coating 541, which is made of a high-temperature resistant sound-absorbing material, such as a ceramic-based sound-absorbing coating, to reduce noise.

[0030] In this embodiment, the central axes of the noise reduction tube 3, the connecting tube head 4, the fixed tube head 11, and the exhaust cylinder 9 are on the same axis. One end of the exhaust cylinder 9 is inserted into the interior of the fixed tube head 11, so that the exhaust gas flows in the same direction, avoiding noise generated by airflow impact.

[0031] Working principle and usage process of this utility model:

[0032] The manifold 1 is connected to the cylinder block, and the intake manifold 2 is connected to the exhaust manifold. Exhaust gas enters the manifold 1 and is finally discharged from the intake manifold 2.

[0033] The exhaust pipe 54 is evenly distributed on the inner sound-absorbing pipe 5. When the exhaust gas in the branch pipe 1 is discharged, the exhaust gas is diverted and flows through the exhaust pipe 54 before entering the inner sound-absorbing pipe 5, and then enters the inlet pipe 2 before being discharged. This achieves the purpose of dividing the exhaust gas flow into multiple streams, thereby reducing the airflow speed and noise. The aperture of the exhaust pipe 54 is smaller than the apertures of the inner sound-absorbing pipe 5 and the inlet pipe 2. Increasing the apertures of the inner sound-absorbing pipe 5 and the inlet pipe 2 reduces the exhaust speed and reduces airflow noise.

[0034] The inner sound-absorbing pipe 5 and the air outlet pipe 54 are made of sound-absorbing material to absorb vibration and noise. The sound-absorbing cylinder 6 installed between the inner sound-absorbing pipe 5 and the noise reduction pipe 3 is made of sound-absorbing material to absorb and reduce noise.

[0035] In addition, the first sound-absorbing coating 7, the second sound-absorbing coating 51, and the third sound-absorbing coating 541 are made of high-temperature resistant sound-absorbing materials, which have good sound absorption performance and can absorb and dissipate sound wave energy, thereby reducing noise propagation.

[0036] In summary: The exhaust manifold has a noise reduction design that disperses exhaust gas and absorbs and dissipates sound waves. When the exhaust gas in the branch pipe 1 is discharged, the exhaust gas is split and flows through the outlet pipe 54 and then enters the inner sound absorption pipe 5, and then enters the intake pipe 2 before being discharged. This achieves the purpose of splitting the exhaust gas flow into multiple streams, thereby absorbing and dissipating sound wave energy, reducing airflow speed, and reducing noise.

[0037] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-noise exhaust manifold for a small gasoline generator set, characterized in that: include Intake pipe (2); A branch pipe (1) is provided at one end of which is an integral fixed pipe head (11); The noise reduction component installed between the branch pipe (1) and the intake pipe (2) includes a connecting pipe head (4) that is threadedly connected to the fixed pipe head (11), a noise reduction pipe (3) integrally cast with the connecting pipe head (4), an inner sound-absorbing pipe (5) separately combined with the noise reduction pipe (3), an exhaust pipe (54) connected to the inside of the inner sound-absorbing pipe (5), and an exhaust cylinder (9) connected to the exhaust pipe (54). The inner sound-absorbing pipe (5) is installed inside the noise reduction pipe (3). A concave air collection groove (53) is opened on the surface of one end of the inner sound-absorbing pipe (5), and an exhaust channel (52) connected to the air collection groove (53) is opened on the surface of the other end of the inner sound-absorbing pipe (5). The exhaust pipe (54) is connected to the corresponding exhaust channel (52). The guide includes a fixed post (81) located at the center and guide plates (82) evenly distributed on the outer surface of the fixed post (81).

2. The low-noise exhaust manifold of a small gasoline generator set according to claim 1, characterized in that: A sound-absorbing tube (6) is installed between the inner sound-absorbing tube (5) and the noise-reducing tube (3), and the sound-absorbing tube (6) is fixed to the inner sound-absorbing tube (5) and the noise-reducing tube (3) by adhesive.

3. The low-noise exhaust manifold of a small gasoline generator set according to claim 1, characterized in that: The inner surface of the noise reduction tube (3) and the outer surface of the inner sound-absorbing tube (5) are coated with a first sound-absorbing coating (7).

4. The low-noise exhaust manifold of a small gasoline generator set according to claim 1, characterized in that: The inner surface of the inner sound-absorbing tube (5) is coated with a second sound-absorbing coating (51).

5. The low-noise exhaust manifold of a small gasoline generator set according to claim 1, characterized in that: The guide plate (82) has its side surface away from the fixed post (81) in contact with the inner surface of the inner sound-absorbing tube (5), and one end of the fixed post (81) has a conical structure.

6. The low-noise exhaust manifold of a small gasoline generator set according to claim 1, characterized in that: One end of the exhaust cylinder (9) is tapered, and the end of the exhaust cylinder (9) near the exhaust pipe (54) is sealed. One end of the exhaust pipe (54) is embedded inside the exhaust cylinder (9), and the inner surface of the exhaust pipe (54) is coated with a third sound-absorbing coating (541).

7. The low-noise exhaust manifold of a small gasoline generator set according to claim 1, characterized in that: The central axes of the noise reduction tube (3), the connecting tube head (4), the fixed tube head (11), and the exhaust cylinder (9) are on the same axis, and one end of the exhaust cylinder (9) is inserted into the interior of the fixed tube head (11).

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