Silencer and engine

Abstract

The utility model discloses a silencer which 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, a catalyst is filled in the reactor, 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. According to the utility model, waste gas before entering the reactor can be scattered, the waste gas is ensured to uniformly enter a catalyst, and all the catalyst can participate in the reaction, so that the utilization rate of the catalyst is improved, the purification of the waste gas is enhanced, and the discharged waste gas can meet the discharge standard with higher requirements. The utility model further provides an engine comprising the silencer.

Description

Technical Field

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

[0002] The muffler, also known as the exhaust silencer, is an important component installed in the exhaust system. Its main function is to reduce the noise and vibration generated by the exhaust gas emitted by the engine. It also has some emission control functions. The muffler slows down the flow of exhaust gas through its internal design and materials, allowing the exhaust gas flow to bend, reflect and disperse internally, thereby reducing the exhaust noise. In order to purify the exhaust gas, a catalyst is also installed in the muffler to absorb harmful gases such as nitrogen oxides and hydrocarbons in the exhaust gas.

[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, the length of the muffler is increased, which also increases the volume of the engine. However, if the collection pipe is not long enough, there will still be the problem of uneven exhaust gas diffusion, resulting in insufficient catalyst reaction, low reaction efficiency and poor exhaust gas purification effect. Utility Model Content

[0004] In order to solve the technical problem of insufficient catalyst reaction of the muffler in the prior art, the utility model provides a muffler, comprising a shell, a reactor and an air inlet duct are arranged in the shell, the reactor is located at the air outlet end of the air inlet duct, and the reactor is filled with a catalyst, wherein: the air inlet duct is curved, and a diverter is arranged in the air inlet duct to disperse the airflow passing through.

[0005] Compared with the prior art, in this solution, the curved setting of the intake duct can shorten the length of the intake duct, thereby reducing the volume of the muffler. When the exhaust gas passes through the curved intake duct of the muffler, most of it enters the catalyst through the outer side of the curved part and above the intake duct, resulting in insufficient catalyst utilization. A diverter is set in front of the catalyst so that the exhaust gas in the intake duct is dispersed by the diverter after passing through the diverter. The dispersed exhaust gas continues to flow in the intake duct to reach the reactor, thereby evenly entering the catalyst. All catalysts can participate in the reaction, which improves the catalyst utilization rate, strengthens the purification of exhaust gas, and enables the discharged exhaust gas to meet higher emission standards.

[0006] Preferably, the flow divider is arranged perpendicular to the air inlet direction of the air inlet, and the outer surface of the flow divider abuts against the inner surface of the air inlet. This solution can ensure that all exhaust gases are dispersed, so the exhaust gases are evenly dispersed and enter the catalyst to participate in the reaction, which can achieve better purification effect.

[0007] Preferably, a plurality of diversion holes are provided on the diversion member. This solution can forcibly divert the exhaust gas, thereby dispersing the airflow and ensuring the purification effect.

[0008] Preferably, the flow diverter holes are symmetrically arranged on the flow diverter element. The symmetrical arrangement in this solution facilitates the installation of the flow diverter element in the air inlet duct.

[0009] Preferably, the reactor is partially inserted into the outlet end of the air inlet. This solution can ensure that all airflows enter the catalyst, ensuring the purification effect of all exhaust gases.

[0010] Preferably, a diffusion section is provided between the reactor and the flow divider. The provision of the diffusion section in this solution can further ensure that the airflow is fully diffused in the air inlet, ensure that the catalyst reacts more fully, and improve the reaction efficiency.

[0011] In a second aspect, the utility model provides an engine, comprising a muffler according to any of the above schemes.

[0012] The utility model has the following beneficial effects:

[0013] 1. The utility model can disperse the waste gas before entering the reactor, ensure that the waste gas enters the catalyst evenly, all the catalysts can participate in the reaction, improve the catalyst utilization rate, strengthen the purification of the waste gas, and make the discharged waste gas meet higher emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a partial schematic diagram of a muffler and an engine embodiment of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the diverter. DETAILED DESCRIPTION

[0016] The following is further described in detail through specific implementation methods:

[0017] 1. Definition

[0018] Catalyst: The muffler catalyst is 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.

[0019] 2. The reference numerals in the drawings of the specification include: lower cover 1, partition 2, muffler chamber 3, reactor 4, air inlet 5, diverter 6, mounting portion 7, diverter hole 8.

[0020] The embodiment is basically as shown in the attached Figure 1 and Figure 2 As shown: a muffler, including a shell, the shell includes a lower cover 1, a baffle 2, an exhaust pipe, a reactor 4 and an air inlet 5 are arranged in the shell, the baffle 2 and the lower cover 1 form a muffler chamber 3, the reactor 4 includes a cylindrical shell and a catalyst filled in the cylindrical shell. The axial direction of the reactor 4 is arranged 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 5.

[0021] The air inlet 5 is bent, and a flow divider 6 is provided inside the air inlet 5 to disperse the air flow passing through. The flow divider 6 is located at one end of the air inlet of the reactor 4. A diffusion section is provided between the reactor 4 and the flow divider 6. In this embodiment, the length of the diffusion section is 0.53 times the diameter of the air inlet 5. The flow divider 6 is perpendicular to the air inlet direction of the air inlet 5, and the outer surface of the flow divider 6 abuts against the inner surface of the air inlet 5. A plurality of flow divider holes 8 are provided on the flow divider 6. In this embodiment, the flow divider holes 8 are symmetrically arranged on the flow divider 6. Figure 2 As shown, mounting portions 7 are provided on both sides of the flow divider 6, and mounting grooves are provided on the inner wall of the air inlet duct 5. The flow divider 6 is installed in the air inlet duct 5 through the cooperation between the mounting portions 7 and the mounting grooves.

[0022] This embodiment also discloses an engine including the above-mentioned muffler.

[0023] The specific implementation process is as follows: after the exhaust gas is discharged from the engine, it enters the intake duct 5. The exhaust gas temperature is high. Therefore, when it flows along the intake duct, since the hot air will flow upward, most of the exhaust gas will flow upward and gather at the upper end of the intake duct. Then it flows along the intake duct 5 and reaches the diverter 6. Although most of the exhaust gas gathers at the top, when it reaches the diverter, it is restricted by the diverter holes on the diverter. Part of the exhaust gas continues to flow through the diverter holes on the upper part of the diverter, and the remaining part of the air flow can only flow through the diverter holes on the lower part of the diverter. Therefore, the exhaust gas is dispersed by the diverter holes 8 on the diverter 6 so that most of the exhaust gas is no longer accumulated above the intake duct 5. Then the exhaust gas continues to flow along the intake duct 5 and enters the diffusion section to ensure that the exhaust gas diffuses more fully. Finally, it reaches the reactor 4 and enters the catalyst. After being purified by the catalyst, it is discharged from the muffler through the exhaust pipe.

[0024] 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 reactor and an air inlet are arranged in the shell, the reactor is located at the outlet end of the air inlet, and the reactor is filled with a catalyst, characterized in that: The air inlet is arranged in a curved manner, and a flow divider is arranged in the air inlet for dispersing the airflow passing through the air inlet.

2. The muffler according to claim 1, characterized in that: The flow divider is arranged perpendicular to the air intake direction of the air intake passage, and the outer surface of the flow divider abuts against the inner surface of the air intake passage.

3. The muffler according to claim 1, characterized in that: The flow dividing member is provided with a plurality of flow dividing holes.

4. The muffler according to claim 3, characterized in that: The flow dividing holes are symmetrically arranged on the flow dividing member.

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

6. The muffler 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: Comprising a muffler as described in any one of claims 1-6.

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