Silencer and engine

Abstract

The silencer comprises a shell, a partition plate is arranged in the shell, a silencing cavity is formed by the partition plate and the shell, the shell is further provided with an air inlet channel extending into the silencing cavity, a catalyst assembly is arranged in the silencing cavity, and the outlet end of the air inlet channel is connected with the catalyst assembly; wherein an air flow mixing piece for mixing air flow exhausted by the air inlet channel is arranged in the air inlet channel. Waste gas and fresh air are forcibly mixed and diffused by utilizing the airflow mixing piece, so that the waste gas can uniformly enter a catalyst when reaching the catalyst, the utilization rate of the catalyst is also improved, the purification effect of the waste gas is ensured, and the emission standard with higher requirements can be met. The invention further discloses 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] As a crucial component of an engine, the muffler reduces engine noise. Since engine exhaust contains harmful gases such as nitrogen oxides and carbon monoxide, modern mufflers also incorporate catalysts to purify the exhaust, reducing the amount of these harmful gases. Therefore, ensuring effective exhaust purification and compliance with emission standards requires sufficient contact between the exhaust gas and the catalyst.

[0003] Chinese patent document CN109252931A discloses a catalyst mounting structure and a silencer, including a reaction tube containing a catalyst, an inlet pipe for introducing waste gas into the reaction tube, and an exhaust pipe for discharging waste gas from the reaction tube. A collection pipe is provided between the inlet end of the reaction tube and the opening of the inlet pipe to slow down the waste gas flow rate. The inner diameter of the collection pipe is larger than the inner diameter of the inlet pipe. In this patent document, the collection pipe slows down the flow rate of the waste gas passing through it, allowing the waste gas to diffuse within the collection pipe before entering the reaction tube. This avoids the waste gas entering the catalyst too quickly and not having enough time to diffuse, which would lead to localized concentration of waste gas in the catalyst and incomplete catalyst reaction, thus improving the catalyst's reaction efficiency. A silencer incorporating this catalyst mounting structure is also provided. With the improvement in catalyst reaction efficiency, the silencer's cleaning ability is enhanced, better adapting to increasingly stringent national emission standards. However, although this prior art allows the waste gas to diffuse before entering the catalyst through the collection pipe, the problem of low catalyst utilization still exists. Summary of the Invention

[0004] To address the technical problem of low catalyst utilization in the prior art, this invention provides a muffler, including a housing, a partition inside the housing forming a muffler cavity with the partition, an air inlet extending into the muffler cavity on the housing, a catalyst assembly inside the muffler cavity, and an outlet end of the air inlet connected to the catalyst assembly; wherein: an airflow mixing component for mixing the airflow discharged from the air inlet is provided inside the air inlet.

[0005] Because the exhaust gas from the engine is at a high temperature, it will be clearly separated from the fresh air entering the intake manifold when it diffuses naturally in the collection pipe. The exhaust gas will be on top of the fresh air and will only slowly mix with the fresh air as it flows along the collection pipe. Therefore, if the exhaust gas has a short diffusion time in the collection pipe, there will be insufficient mixing. As a result, when it enters the catalyst, it will only come into contact with a localized part of the catalyst, leading to low catalyst utilization and failure to meet emission standards.

[0006] In this solution, an airflow mixing component is added to the section of the airflow path between the exhaust gas and the catalyst. This component forces the exhaust gas and fresh air to mix and diffuse, ensuring that the exhaust gas can enter the catalyst evenly when it reaches the catalyst. This improves the catalyst utilization rate, ensures the purification effect of the exhaust gas, and meets higher emission standards.

[0007] Preferably, the airflow mixing component is a spoiler arranged radially parallel to the air intake duct, and the spoiler has multiple turbulence holes. This design can achieve forced mixing of exhaust gas and fresh air, ensuring sufficient mixing of fresh air and exhaust gas, and has a simple structure.

[0008] Preferably, the air inlet side of the turbulence hole is provided with a raised air guide section, which has an air guide channel communicating with the turbulence hole. The windward surface of the air guide section is inclined towards another turbulence hole. In this design, the air guide channel can introduce exhaust gas and fresh air into the turbulence hole, while the windward surface can guide the airflow blowing onto the airflow mixing component to the air guide channel, thereby ensuring smooth airflow mixing and a simple structure.

[0009] Preferably, the air outlet side of the turbulence hole is provided with a protruding air outlet portion, which is provided with an air outlet duct communicating with the air guide duct. The outer surface of the air outlet portion is inclined in the direction away from the air outlet side of the turbulence hole along the air outlet direction. In this solution, the air outlet portion is used to guide the airflow passing through the turbulence hole to achieve the mixing of subsequent airflow, and the structure is simple.

[0010] Preferably, the air intake duct includes a connecting section, a diffuser section, and a mixing section in sequence. The connecting section is located at the air intake end of the air intake duct, the diameter of the diffuser section increases from the connecting section to the mixing section, and the airflow mixing component is located at the rear end of the diffuser section and connected to the mixing section. In this design, the diffuser section is used to diffuse the airflow first, and then turbulence mixing is performed, thereby ensuring that the airflow can be mixed more fully.

[0011] Preferably, the air inlet end of the catalyst assembly is inserted into the mixing section. In this solution, the mixing section is used to install the catalyst assembly, eliminating the need for an additional installation structure for the catalyst assembly.

[0012] Preferably, the air intake is connected to a supplementary air pipe. This design ensures a continuous intake of fresh air and has a simple structure.

[0013] Secondly, the present invention provides an engine including a muffler of any of the above-described embodiments.

[0014] The present invention has the following beneficial effects: 1. This invention utilizes an airflow mixing component to forcibly mix and diffuse exhaust gas and fresh air. Therefore, when the exhaust gas reaches the catalyst, it can enter the catalyst evenly, thereby improving the catalyst utilization rate, ensuring the purification effect of the exhaust gas, and meeting higher emission standards.

[0015] 2. The present invention first diffuses the airflow and then mixes it with turbulence, thereby ensuring that the airflow can be mixed more fully. Attached Figure Description

[0016] Figure 1 This is a partial schematic diagram of the muffler in an embodiment of the muffler and engine of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the central spoiler. Detailed Implementation

[0017] The following detailed description illustrates the specific implementation method: 1. Definition Catalytic converter assembly: This is a device used in exhaust systems that combines a catalyst and a ceramic matrix. The catalyst accelerates the oxidation of harmful substances in exhaust gases, 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 gases but also effectively reduces exhaust noise.

[0018] Turbulence: refers to the instability of fluid flow caused by changing the shape or arrangement of an object's surface, thereby generating unstable flow states such as turbulence or eddies.

[0019] 2. The reference numerals in the accompanying drawings include: housing 1, air inlet 2, baffle 3, silencer 4, diffuser section 5, spoiler 6, catalyst assembly 7, air guide 61, air guide 611, windward surface 612, air outlet 62, and air outlet 621.

[0020] The basic implementation examples are as follows: Figure 1 As shown: A muffler includes a housing with a partition 3 inside. The partition 3 and the housing 1 form a muffler cavity 4. The housing also has an air inlet duct 2 extending into the muffler cavity 4, and the air inlet duct 2 is connected to a make-up air pipe. A catalyst assembly 7 is installed inside the muffler cavity 4, and the outlet end of the air inlet duct 2 is connected to the catalyst assembly 7. The air inlet duct 2 includes a connecting section, a diffuser section 5, and a mixing section in sequence. The connecting section is located at the air inlet end of the air inlet duct, the diameter of the diffuser section increases from the connecting section towards the mixing section, and an airflow mixing component is located at the rear end of the mixing section and connected to the mixing section. The air inlet end of the catalyst assembly 7 is inserted into the mixing section.

[0021] The intake duct 2 is equipped with an airflow mixing component that mixes the airflow exiting the intake duct 2. Specifically, such as... Figure 2As shown, the airflow mixing component is a spoiler 6 arranged radially parallel to the air intake duct 2, and the spoiler 6 has multiple spoiler holes. The air intake side of the spoiler hole has a raised air guide portion 61, and the air guide portion 61 has an air guide channel 611 communicating with the spoiler hole. The windward surface 612 of the air guide portion 61 is inclined towards another spoiler hole. The air outlet side of the spoiler hole has a raised air outlet portion 62, and the air outlet portion 62 has an air outlet channel 621 communicating with the air guide channel 611. The outer surface of the air outlet portion 62 is inclined in the direction away from the air outlet side of the spoiler hole along the air outlet direction.

[0022] This embodiment also provides an engine that includes the above-described muffler.

[0023] The specific implementation process is as follows: Exhaust gas from the engine enters the intake duct 2, and fresh air enters the intake duct 2 through the air supply pipe. The exhaust gas and fresh air flow along the intake duct 2. When entering the diffuser section 5, the exhaust gas and fresh air diffuse and mix. Then, the mixed gas flows to the spoiler 6, flows along the windward side 612 of the air guide section 61, enters the spoiler hole, and then flows out along the air outlet 62 into the mixing section. There, the exhaust gas and fresh air mix again, and the fully mixed gas enters the catalyst. The catalyst contacts the gas and purifies it. The purified gas continues to flow and finally exits the muffler.

[0024] 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 muffler, comprising a housing, a partition plate being provided inside the housing to form a muffler cavity, an air inlet extending into the muffler cavity being provided on the housing, a catalyst assembly being provided inside the muffler cavity, and an outlet end of the air inlet plate being connected to the catalyst assembly; characterized in that: The air intake duct is equipped with an airflow mixing component that mixes the airflow discharged from the air intake duct.

2. The silencer according to claim 1, characterized in that: The airflow mixing component is a spoiler plate arranged radially parallel to the air intake, and the spoiler plate is provided with multiple spoiler holes.

3. The silencer according to claim 2, characterized in that: The air inlet side of the turbulence hole is provided with a protruding air guide, the air guide is provided with an air guide channel communicating with the turbulence hole, and the windward surface of the air guide is inclined towards another turbulence hole.

4. The silencer according to claim 3, characterized in that: The air outlet side of the turbulence hole is provided with a protruding air outlet portion, the air outlet portion is provided with an air outlet channel communicating with the air guide channel, and the outer surface of the air outlet portion is inclined in the direction away from the air outlet side of the turbulence hole along the air outlet direction.

5. The silencer according to any one of claims 1-4, characterized in that: The air intake duct includes a connecting section, a diffuser section, and a mixing section in sequence. The connecting section is located at the air intake end of the air intake duct. The diameter of the diffuser section increases from the connecting section to the mixing section. The airflow mixing component is located at the rear end of the diffuser section and is connected to the mixing section.

6. The silencer according to claim 5, characterized in that: The air inlet of the catalyst assembly is inserted into the mixing section.

7. The silencer according to claim 6, characterized in that: The air intake is connected to a supplemental air pipe.

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

Images