Muffler and engine

Abstract

The utility model discloses a muffler, including a shell, a partition is arranged in the shell, the partition and the shell form a muffler chamber, the shell is also provided with an air inlet extending into the muffler chamber, a catalyst assembly is arranged in the muffler chamber, and the outlet end of the air inlet is connected to the catalyst assembly; wherein: an air flow mixer is arranged in the air inlet for mixing the air flow discharged from the air inlet. The utility model utilizes the air flow mixer to force the exhaust gas and fresh air to mix and diffuse, so when the exhaust gas reaches the catalyst, it can evenly enter the catalyst, thus improving the catalyst utilization rate, ensuring the purification effect of the exhaust gas, and meeting higher emission standards. The utility model also discloses an engine including the above-mentioned muffler.

Description

Technical Field

[0001] The utility model relates to a muffler, in particular to a muffler and an engine. Background Art

[0002] As an important component of the engine, the muffler can reduce the noise generated by the engine. Since the exhaust gas emitted by the engine contains harmful gases such as nitrogen oxides and carbon monoxide, the muffler is currently equipped with a catalyst to purify the exhaust gas and reduce the amount of harmful gases contained in the exhaust gas. Therefore, in order to ensure the purification effect of the exhaust gas and make the exhaust gas meet the emission standards, the exhaust gas needs to be fully in contact with the catalyst.

[0003] Chinese patent document CN109252931A discloses a catalyst installation structure and a muffler, including a reaction tube equipped with 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 collecting pipe for slowing down the exhaust gas flow rate is provided between the intake end of the reaction tube and the pipe mouth of the intake pipe, and the inner diameter of the collecting pipe is larger than the inner diameter of the intake pipe. In the patent document, the collecting pipe slows down the flow rate of the exhaust gas passing through it, and the exhaust gas diffuses in the collecting pipe before entering the reaction tube, thereby avoiding the exhaust gas entering the catalyst too fast and not having time to diffuse, resulting in local concentration of exhaust gas in the catalyst, insufficient catalyst reaction, and improving the reaction efficiency of the catalyst. At the same time, a muffler including the catalyst installation structure is also provided. With the improvement of the catalyst reaction efficiency, the cleaning ability of the muffler is improved, and it can better adapt to the increasingly stringent national emission standards. However, in the prior art, although the exhaust gas can be diffused through the collecting pipe before entering the catalyst, there is still a problem of low catalyst utilization. Utility Model Content

[0004] In order to solve the technical problem of low catalyst utilization rate in the prior art, the utility model provides a muffler, including a shell, a baffle is arranged in the shell, the baffle and the shell form a muffler chamber, the shell is also provided with an air inlet extending into the muffler chamber, the muffler chamber is provided with a catalyst assembly, and the outlet end of the air inlet is connected to the catalyst assembly; wherein: an air flow mixing element is arranged in the air inlet for mixing the air flow discharged from the air inlet.

[0005] Since the exhaust gas temperature discharged by the engine is relatively high, when the exhaust gas enters the collecting pipe and diffuses naturally, it will be clearly stratified with the fresh air entering the intake duct, and the exhaust gas will be on the upper layer of the fresh air. It will slowly mix with the fresh air in the process of flowing along the collecting pipe. Therefore, if the exhaust gas diffusion time in the collecting pipe is short, there will be a problem of insufficient mixing. Therefore, when entering the catalyst, it will only come into contact with local catalysts, resulting in the problem of low catalyst utilization rate, and it will also cause the exhaust gas to fail to meet emission standards.

[0006] In this solution, an air flow mixer is added in the section after the exhaust gas is discharged from the intake duct and before it enters the catalyst. The air flow mixer is used to force the exhaust gas and fresh air to mix and diffuse. Therefore, when the exhaust gas reaches the catalyst, it can enter the catalyst evenly, thereby improving the catalyst utilization rate, ensuring the exhaust gas purification effect, and meeting higher emission standards.

[0007] Preferably, the airflow mixing element is a spoiler arranged radially parallel to the air inlet, and a plurality of spoiler holes are arranged on the spoiler. This solution can realize the forced mixing of exhaust gas and fresh air, ensure the full mixing of fresh air and exhaust gas, and has a simple structure.

[0008] Preferably, a raised air guide portion is provided on the air inlet side of the spoiler hole, and the air guide portion is provided with an air guide channel connected to the spoiler hole, and the windward surface of the air guide portion is inclined toward another spoiler hole. In this solution, the air guide channel can introduce exhaust gas and fresh air into the spoiler hole, and the windward surface can guide the airflow blowing onto the airflow mixing element to the air guide channel, thereby ensuring smooth mixing of the airflow, and the structure is simple.

[0009] Preferably, a raised air outlet portion is provided on the air outlet side of the spoiler hole, the air outlet portion is provided with an air outlet duct connected to the air guide duct, and the outer surface of the air outlet portion is inclined along the air outlet direction toward the direction away from the air outlet side of the spoiler hole. In this solution, the air outlet portion is used to guide the airflow passing through the spoiler hole to achieve mixing of subsequent airflows, and the structure is simple.

[0010] Preferably, the air inlet duct includes a connecting section, a diffusion section 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 diffusion section increases along the connecting section toward the mixing section, and the air flow mixer is located at the rear end of the diffusion section and connected to the mixing section. In this solution, the diffusion section is used to diffuse the air flow first, and then the turbulent flow mixing is performed, thereby ensuring that the air flow can be more fully mixed.

[0011] Preferably, the air inlet end of the catalyst assembly is inserted into the mixing section. In this solution, the catalyst assembly is installed by using the mixing section, and there is no need to set up an additional installation structure of the catalyst assembly.

[0012] Preferably, the air inlet is connected to an air supply pipe. This solution can ensure the continuous entry of fresh air and has a simple structure.

[0013] In a second aspect, the utility model provides an engine, comprising a muffler according to any of the above schemes.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model utilizes an air flow mixer to forcefully mix and diffuse the exhaust gas and fresh air. Therefore, when the exhaust gas reaches the catalyst, it can evenly enter the catalyst, thereby improving the catalyst utilization rate, ensuring the exhaust gas purification effect, and meeting higher emission standards.

[0016] 2. The utility model diffuses the airflow first and then performs turbulent mixing, thereby ensuring that the airflow can be more fully mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial schematic diagram of the muffler in the embodiment of the utility model and the engine;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the middle spoiler. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] 1. Definition

[0021] Catalyst assembly: A device used in the exhaust system that combines a catalyst and a ceramic matrix. The role of the catalyst is to accelerate the oxidation reaction of harmful substances in the exhaust gas, converting them into harmless carbon dioxide and water. The ceramic matrix is ​​responsible for absorbing sound waves and reducing exhaust noise. Therefore, the catalyst can not only purify the exhaust gas, but also effectively reduce the noise during exhaust.

[0022] Disturbance: refers to the instability of fluid flow caused by changing the shape or layout of the surface of an object, thereby producing unstable flow states such as turbulence or eddy currents.

[0023] 2. The reference numerals in the drawings of the specification include: housing 1, air inlet duct 2, partition 3, muffler chamber 4, diffuser 5, spoiler 6, catalyst assembly 7, air guide portion 61, air guide duct 611, windward surface 612, air outlet portion 62, and air outlet duct 621.

[0024] The embodiment is basically as shown in the attached Figure 1 As shown: the muffler includes a shell, a partition 3 is provided in the shell, and the partition 3 and the shell 1 form a muffler chamber 4. The shell is also provided with an air inlet 2 extending into the muffler chamber 4, and the air inlet 2 is connected to an air supply pipe. A catalyst assembly 7 is provided in the muffler chamber 4, and the outlet end of the air inlet 2 is connected to the catalyst assembly 7. The air inlet 2 includes a connecting section, a diffusion section 5 and a mixing section in sequence. The connecting section is located at the air inlet end of the air inlet, and the diameter of the diffusion section increases along the connecting section toward the mixing section. The air flow mixer 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.

[0025] An air flow mixing element is provided in the air intake duct 2 for mixing the air flow discharged from the air intake duct 2. Specifically, Figure 2As shown, the air flow mixing element is a spoiler 6 arranged radially parallel to the air inlet duct 2, and a plurality of spoiler holes are arranged on the spoiler 6. A raised air guide portion 61 is arranged on the air inlet side of the spoiler hole, and the air guide portion 61 is provided with an air guide duct 611 connected to the spoiler hole, and a windward surface 612 of the air guide portion 61 is arranged obliquely toward another spoiler hole. A raised air outlet portion 62 is arranged on the air outlet side of the spoiler hole, and the air outlet portion 62 is provided with an air outlet duct 621 connected to the air guide duct 611, and the outer surface of the air outlet portion 62 is arranged obliquely along the air outlet direction toward the direction away from the air outlet side of the spoiler hole.

[0026] This embodiment also provides an engine including the above-mentioned muffler.

[0027] The specific implementation process is as follows: the exhaust gas discharged by the engine enters the intake duct 2, and the fresh air enters the intake duct 2 through the air supply pipe. The exhaust gas and the fresh air flow along the intake duct 2, and when entering the diffusion section 5, the exhaust gas and the fresh air diffuse and mix, and then the mixed gas flows to the spoiler 6, flows along the windward surface 612 of the air guide part 61, enters the spoiler hole, and then flows out along the air outlet part 62 to enter the mixing section, so that the exhaust gas and the fresh air are mixed again, and the fully mixed gas enters the catalyst, the catalyst contacts the gas, purifies the gas, and the purified gas continues to flow and is finally discharged from the muffler.

[0028] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A muffler, comprising a shell, a baffle plate provided in the shell, the baffle plate and the shell forming a muffler chamber, an air inlet extending into the muffler chamber provided on the shell, a catalyst assembly provided in the muffler chamber, an outlet end of the air inlet connected to the catalyst assembly; characterized in that: An air flow mixing element for mixing the air flow discharged from the air flow passage is arranged in the air flow passage.

2. The muffler according to claim 1, characterized in that: The airflow mixing element is a spoiler disposed radially parallel to the air inlet duct, and a plurality of spoiler holes are disposed on the spoiler.

3. The muffler according to claim 2, characterized in that: A raised air guide portion is provided on the air inlet side of the spoiler hole, and the air guide portion is provided with an air guide channel connected with the spoiler hole, and the windward surface of the air guide portion is inclined toward another spoiler hole.

4. The muffler according to claim 3, characterized in that: A raised air outlet portion is provided on the air outlet side of the spoiler hole, and the air outlet portion is provided with an air outlet duct connected to the air guide duct, and an outer surface of the air outlet portion is inclined along the air outlet direction toward a direction away from the air outlet side of the spoiler hole.

5. The muffler according to any one of claims 1 to 4, characterized in that: The air inlet duct includes a connecting section, a diffusion section 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 diffusion section increases along the connecting section toward the mixing section. The airflow mixing element is located at the rear end of the diffusion section and connected to the mixing section.

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

7. The muffler according to claim 6, characterized in that: The air inlet passage is connected with an air supply pipe.

8. An engine, characterized in that: Comprising a muffler as described in any one of claims 1-7.

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