Silencer and engine

Abstract

The silencer comprises a shell, a reactor and an air inlet channel are arranged in the shell, the reactor is located at the air outlet end of the air inlet channel, the reactor is filled with a catalyst, the air inlet channel is arranged in a bent mode, and a flow dividing piece enabling passing air flow to be dispersed is arranged in the air inlet channel. Waste gas before entering the reactor can be scattered, it is guaranteed that the waste gas evenly enters a catalyst, all the catalyst can participate in the reaction, the utilization rate of the catalyst is increased, purification of the waste gas is enhanced, and the discharged waste gas can meet the emission standard with the higher requirement. The invention further provides an engine comprising the silencer.

Description

Technical Field

[0001] This invention relates to a muffler, and more specifically to a muffler and an engine. Background Technology

[0002] A muffler, also known as an exhaust muffler, is an important component installed in the exhaust system. Its main function is to reduce the noise and vibration generated by engine exhaust gases, and it also plays a role in emission control. Through its internal design and materials, the muffler slows down the flow of exhaust gases, causing the exhaust airflow to bend, reflect, and disperse internally, thereby reducing exhaust noise. To further purify the exhaust gases, the muffler also contains a catalytic converter to absorb harmful gases such as nitrogen oxides and hydrocarbons.

[0003] Chinese patent document CN109252931A discloses a catalyst mounting structure and a muffler, including a reaction tube containing a catalyst, an intake pipe for introducing exhaust gas into the reaction tube, and an exhaust pipe for discharging exhaust gas from the reaction tube. A collection pipe is provided between the intake end of the reaction tube and the opening of the intake pipe to slow down the exhaust gas flow rate. The inner diameter of the collection pipe is larger than the inner diameter of the intake pipe. In this patent document, the collection pipe slows down the flow rate of the exhaust gas passing through it, allowing the exhaust gas to diffuse within the collection pipe before entering the reaction tube. This avoids the exhaust gas entering the catalyst too quickly and not having enough time to diffuse, which would lead to localized concentration of exhaust gas in the catalyst and incomplete catalyst reaction, thus improving the catalyst's reaction efficiency. A muffler incorporating this catalyst mounting structure is also provided. With the improvement in catalyst reaction efficiency, the muffler's cleaning ability is improved, better adapting to increasingly stringent national emission standards. However, this prior art increases the length of the muffler, thus increasing the engine size. However, if the collection pipe is not long enough, there will still be problems with uneven diffusion of exhaust gas, resulting in insufficient catalytic reaction, low reaction efficiency, and poor purification effect on exhaust gas. Summary of the Invention

[0004] To address the technical problem of insufficient catalytic reaction in existing silencers, this invention provides a silencer comprising a housing, a reactor and an air inlet duct within the housing, the reactor being located at the air outlet of the air inlet duct, and the reactor being filled with a catalyst, wherein the air inlet duct is curved and a flow divider is provided within the air inlet duct to disperse the passing airflow.

[0005] Compared with existing technologies, the curved intake duct in this solution shortens the length of the intake duct, thereby reducing the volume of the muffler. When exhaust gas passes through the curved intake duct of the muffler, most of it enters the catalyst via the outer side of the bend and above the intake duct, resulting in insufficient catalyst utilization. By installing a flow divider before the catalyst, the exhaust gas in the intake duct is dispersed after passing through the flow divider. The dispersed exhaust gas continues to flow within the intake duct and reaches the reactor, thus uniformly entering the catalyst. All the catalyst can participate in the reaction, improving catalyst utilization and enhancing the purification of exhaust gas, enabling the emitted exhaust gas to meet higher emission standards.

[0006] Preferably, the diverter is positioned perpendicular to the air intake direction of the air intake duct, and the outer surface of the diverter abuts against the inner surface of the air intake duct. This design ensures that all exhaust gases are dispersed, so the uniformly dispersed exhaust gases enter the catalyst to participate in the reaction, resulting in a better purification effect.

[0007] Preferably, the flow divider is provided with multiple flow divider holes. This solution can force the exhaust gas to flow separately, thereby dispersing the airflow and ensuring the purification effect.

[0008] Preferably, the flow dividers are symmetrically arranged on the flow divider. This symmetrical arrangement facilitates the installation of the flow divider within the intake duct.

[0009] Preferably, the reactor section is inserted into the outlet end of the air inlet duct. This design ensures that all airflow enters the catalyst, guaranteeing the purification effect on all waste gases.

[0010] Preferably, a diffusion section is provided between the reactor and the flow divider. The diffusion section in this design further ensures sufficient diffusion of the airflow within the inlet duct, guaranteeing a more complete catalytic reaction and improving reaction efficiency.

[0011] Secondly, the present invention provides an engine including a muffler as described in any of the above embodiments.

[0012] The present invention has the following beneficial effects: 1. This invention can disperse the waste gas before it enters the reactor, ensuring that the waste gas enters the catalyst evenly and that all the catalyst can participate in the reaction, thereby improving the catalyst utilization rate, enhancing the purification of the waste gas, and enabling the emitted waste gas to meet higher emission standards. Attached Figure Description

[0013] Figure 1 This is a partial schematic diagram of a muffler and an engine embodiment of the present invention; Figure 2 This is a schematic diagram of the flow divider. Detailed Implementation

[0014] The following detailed description illustrates the specific implementation method: 1. Definition Catalyst: The catalyst in a muffler is a device used in the exhaust system that combines a catalyst and a ceramic matrix. The catalyst accelerates the oxidation reaction of harmful substances in the exhaust gas, converting them into harmless carbon dioxide and water. The ceramic matrix absorbs sound waves and reduces exhaust noise. Therefore, the catalyst not only purifies exhaust gas but also effectively reduces exhaust noise.

[0015] 2. The reference numerals in the accompanying drawings include: 1. lower cover, 2. partition, 3. silencer cavity, 4. reactor, 5. air inlet, 6. flow divider, 7. mounting part, and 8. flow divider hole.

[0016] The basic implementation examples are as follows: Figure 1 and Figure 2 As shown: A silencer includes a housing, which includes a lower cover 1. Inside the housing, there is a partition 2, an exhaust pipe, a reactor 4, and an air inlet duct 5. The partition 2 and the lower cover 1 form a silencer cavity 3. The reactor 4 includes a cylindrical housing and a catalyst filled inside the cylindrical housing. The axial direction of the reactor 4 is parallel to the air inlet direction, and the air inlet end of the reactor 4 is inserted into the air outlet end of the air inlet duct 5.

[0017] The air inlet duct 5 is curved, and a flow divider 6 is provided inside the air inlet duct 5 to disperse the passing airflow. The flow divider 6 is located at one end of the air inlet of the reactor 4. A diffuser section is provided between the reactor 4 and the flow divider 6. In this embodiment, the length of the diffuser section is 0.53 times the diameter of the air inlet duct 5. The flow divider 6 is arranged perpendicular to the air intake direction of the air inlet duct 5, and the outer surface of the flow divider 6 abuts against the inner surface of the air inlet duct 5. The flow divider 6 is provided with multiple flow divider holes 8. In this embodiment, the flow divider holes 8 are symmetrically arranged on the flow divider duct 6. Figure 2 As shown, the splitter 6 has mounting parts 7 on both sides, and the inner wall of the intake duct 5 has a mounting groove. The splitter 6 is installed in the intake duct 5 through the cooperation of the mounting parts 7 and the mounting groove.

[0018] This embodiment also discloses an engine that includes the above-described muffler.

[0019] The specific implementation process is as follows: After the exhaust gas is discharged from the engine, it enters the intake duct 5. Due to the high temperature of the exhaust gas, as it flows along the intake duct, the hot air rises, causing most of the exhaust gas to rise and accumulate at the upper part of the intake duct. It then flows along the intake duct 5 and reaches the distributor 6. Although most of the exhaust gas accumulates at the top, upon reaching the distributor, it is restricted by the diversion holes on the distributor. Some of the exhaust gas continues to flow through the upper part of the distributor holes, while the remaining airflow can only flow through the lower part of the distributor holes. Thus, the exhaust gas is dispersed by the diversion holes 8 on the distributor 6, preventing it from accumulating above the intake duct 5. The exhaust gas then continues to flow along the intake duct 5, entering the diffuser section to ensure more complete diffusion. Finally, it reaches the reactor 4 and enters the catalyst, where it is purified and discharged through the exhaust pipe into the muffler.

[0020] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A silencer, comprising a housing, wherein a reactor and an air inlet are disposed within the housing, the reactor being located at the air outlet end of the air inlet, and the reactor being filled with a catalyst, characterized in that: The air intake is curved, and a flow divider is provided inside the air intake to disperse the airflow.

2. The silencer according to claim 1, characterized in that: The diverter is arranged perpendicular to the air intake direction of the air intake duct, and the outer surface of the diverter abuts against the inner surface of the air intake duct.

3. The silencer according to claim 1, characterized in that: The flow divider is provided with multiple flow divider holes.

4. The silencer according to claim 3, characterized in that: The flow divider holes are symmetrically arranged on the flow divider.

5. The silencer according to any one of claims 1-4, characterized in that: The reactor portion is inserted into the outlet end of the air inlet.

6. The silencer according to claim 5, characterized in that: A diffusion section is provided between the reactor and the flow divider.

7. An engine, characterized in that: Including the silencer as described in any one of claims 1-6.

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