Silencer and engine

Abstract

The utility model discloses a silencer which comprises a shell, a silencing cavity is formed in the shell, an air inlet communicated with the silencing cavity is formed in the shell, an air inlet pipe is arranged in the silencing cavity, one end of the air inlet pipe is matched with the air inlet in a sealing mode, an air supplementing pipe is arranged on the shell in a penetrating mode, and the other end of the air supplementing pipe is matched with the silencing cavity. One end of the air supplementing pipe extends into the silencing cavity and is directly communicated with the air inlet pipe, and the air supplementing pipe is matched with the shell in a sealed mode. According to the scheme, the problem that in the prior art, emission of a silencer is prone to exceeding the standard is solved.

Description

Technical Field

[0001] The utility model relates to an airflow muffler for a general engine which utilizes air supplement to perform exhaust treatment, in particular to a muffler.

[0002] The utility model also relates to an engine. Background Art

[0003] A muffler is a device used to reduce the exhaust noise of an engine, and this is mainly achieved by weakening the exhaust noise through multiple chambers set in the muffler. The combustion exhaust gas emitted by the engine contains a large amount of pollutants, so the existing way to reduce pollution emissions is mainly to set a catalyst in the muffler to consume the pollutants. When the catalyst catalyzes the reaction of pollutants, it requires a certain amount of fresh air in the exhaust gas to better carry out the catalytic reaction. In the prior art, the muffler is generally connected to the exhaust pipe of the engine, and an air supply pipe is connected to the exhaust pipe. The air supply pipe is used to supplement fresh air to the exhaust pipe of the engine, so that the exhaust gas and fresh air are mixed and enter the muffler for reaction.

[0004] Chinese patent document CN110080866A discloses an emission reduction device for a generator set, wherein a muffler is disclosed, the exhaust pipe of the generator set is connected to the muffler, and an air supply pipe is connected to the exhaust pipe. The prior art connects the air supply pipe to the exhaust pipe of the generator set to supply air, so that the exhaust gas is mixed with fresh air before entering the muffler.

[0005] In existing engines, sometimes the exhaust pipe of the engine cannot be set, so the muffler needs to be directly connected to the engine, so that the air supply pipe can only be directly connected to the muffler to achieve the mixing of exhaust gas and fresh air. The specific setting method is generally to connect the air supply pipe with the muffler cavity of the muffler, and the exhaust gas discharged by the engine first enters the muffler cavity of the muffler. However, such a setting method is prone to excessive pollutant emissions when used. Utility Model Content

[0006] The utility model aims to provide a muffler to solve the problem that the muffler in the prior art easily has excessive emissions.

[0007] In order to achieve the above-mentioned purpose, the basic scheme of the utility model provides a muffler and an engine, including a shell, a muffler cavity is formed inside the shell, an air inlet connected to the muffler cavity is arranged on the shell, an air inlet pipe is arranged in the muffler cavity, one end of the air inlet pipe is sealed with the air inlet, an air supply pipe is arranged through the shell, one end of the air supply pipe extends into the muffler cavity and is directly connected to the air supply pipe, and the air supply pipe is sealed with the shell.

[0008] Preferably, the air intake pipe is provided with a bent portion, and the connection between the air supply pipe and the air intake pipe is located outside the bent portion.

[0009] Preferably, the connection between the air supply pipe and the air intake pipe is close to an end of the air intake pipe connected to the air inlet.

[0010] Preferably, a portion of the air inlet pipe located at the curved portion away from the air inlet is bent.

[0011] The position where the air supply pipe penetrates the shell is located on the same side of the shell as the air inlet. With such an arrangement, the air supply pipe and the air inlet are connected and assembled on the same side of the shell, which is conducive to reducing the space required for the installation of the muffler.

[0012] The utility model also provides an engine, comprising any one of the above-mentioned mufflers.

[0013] The utility model has the following beneficial effects:

[0014] 1. An air intake pipe is arranged in the silencer chamber of the muffler, and an air supply pipe directly connected to the air intake pipe is arranged on the muffler, so that the air supply pipe directly supplies fresh air to the air intake pipe, thereby avoiding the phenomenon of unstable air supply volume when the air supply pipe is connected to the muffler chamber, thereby ensuring the stability of fresh air supply, which is conducive to the muffler to process pollutants in the exhaust gas and avoid the problem of excessive emissions.

[0015] 2. The bending arrangement of the intake pipe and the arrangement of the curved portion make it difficult for the pressure fluctuation formed in the muffler to affect the air supply of the air supply pipe, which is beneficial to further improve the stability of the air supply, thereby improving the muffler's performance in treating exhaust gas.

[0016] 3. The air intake pipe prevents the exhaust gas entering the silencer cavity from the air intake from blowing directly against the partition, thereby preventing the partition from being damaged due to the high temperature of the exhaust gas for a long time, which is beneficial to increasing the service life of the muffler. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 for Figure 1 Middle AA section view;

[0019] Figure 3 It is a schematic diagram of embodiment 2 of the muffler of the utility model. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The reference numerals in the drawings of the specification include: a partition 1, a muffler chamber 2, an air intake pipe 3, a curved portion 31, a lower shell 4, an air inlet 5, an air supply pipe 6, and an air supply conduit 7.

[0022] Embodiment 1: As attached Figure 1 and Figure 2 As shown: an engine includes a muffler. The muffler includes a shell, and a muffler chamber 2 is formed inside the shell. Figure 1 The lower shell 4 part of the shell is shown, and the upper shell part is not shown. It is a conventional technology in the field to form the shell of the muffler by interlocking the upper shell and the lower shell 4, which will not be repeated here. A partition 1 is arranged in the shell, and the muffler chamber 2 is formed by the partition 1 and the shell. Specifically, in this embodiment, the muffler chamber 2 is formed by the partition 1. The lower shell 4 is provided with an air inlet 5 connected to the muffler chamber 2, and the air inlet 5 is located on the side of the muffler chamber 2 facing the partition 1. An air inlet pipe 3 is arranged in the muffler chamber 2, and one end of the air inlet pipe 3 is sealed with the air inlet 5. The air inlet pipe 3 is provided with a bending portion 31, and the air flow in the air inlet pipe 3 from the air inlet 5 toward the partition 1 is gradually transitioned to an air flow roughly parallel to the partition 1 through the bending portion 31. In this embodiment, the part of the air inlet pipe 3 located at the bending portion 31 away from the air inlet 5 is bent. In this embodiment, the specific bending configuration is that the end of the air inlet pipe 3 away from the bending portion 31 is rounded.

[0023] An air supply pipe 6 is provided through the lower shell 4, and one end of the air supply pipe 6 extends into the muffler chamber 2 and is directly connected to the air intake pipe 3. In the present embodiment, the air supply pipe 6 is sealed with the lower shell 4. In the present embodiment, the connection between the air supply pipe 6 and the air intake pipe 3 is located outside the curved portion 31. The connection between the air supply pipe 6 and the air intake pipe 3 is close to the end where the air intake pipe 3 is connected to the air inlet 5, so that the air supply pipe 6 can replenish the air intake pipe 3 in time, so that the supplementary gas can be mixed with the original gas in the air intake pipe 3 as soon as possible.

[0024] The specific implementation process is as follows:

[0025] The exhaust gas discharged by the engine enters the intake pipe 3 in the silencer chamber 2 of the muffler from the air inlet 5, and the air supply pipe 6 replenishes fresh air into the intake pipe 3 through the external air supply duct 7, so that the exhaust gas and the fresh air are mixed while moving in the intake pipe 3, and the air supply pipe 6 can stably replenish the fresh air to the intake pipe 3, so that the catalyst in the muffler can effectively treat the exhaust gas, thereby ensuring the emission effect of the muffler and avoiding the problem of excessive emissions.

[0026] Example 2: Figure 3As shown, the difference from embodiment 1 is that the position where the air supply pipe 6a passes through the shell 4 and the air inlet 5 are located on the same side of the shell 4. This arrangement is conducive to reducing the space required for the installation of the muffler, so that it is convenient to use in a space-constrained environment.

[0027] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A muffler, comprising a shell, a muffler cavity is formed inside the shell, and an air inlet connected to the muffler cavity is provided on the shell, characterized in that: An air intake pipe is arranged in the muffler cavity, one end of which is sealed with the air inlet, an air supply pipe is arranged through the shell, one end of which extends into the muffler cavity and is directly connected with the air intake pipe, and the air supply pipe is sealed with the shell.

2. The muffler according to claim 1, characterized in that: The air intake pipe is provided with a bent portion, and the connection between the air supply pipe and the air intake pipe is located outside the bent portion.

3. The muffler according to claim 2, characterized in that: The connection between the air supply pipe and the air intake pipe is close to one end of the air intake pipe connected to the air inlet.

4. The muffler according to claim 3, characterized in that: The portion of the air inlet pipe located at the bent portion away from the air inlet is bent.

5. The muffler according to claim 1, characterized in that: The position where the air supply pipe penetrates the shell is located on the same side of the shell as the air inlet.

6. An engine, characterized in that: Comprising the muffler according to any one of claims 1 to 5.

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