Silencer and engine

Abstract

The silencer 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 sealed mode, an air supplementing pipe is arranged on the shell in a penetrating mode, and an air outlet is formed in the shell. 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] This invention relates to an airflow muffler for general engines that utilizes supplemental air for exhaust treatment, specifically a muffler.

[0002] The present invention also relates to engines. Background Technology

[0003] A muffler is a device used to reduce engine exhaust noise, primarily by weakening the noise through multiple chambers within the muffler. Engine exhaust contains a large amount of pollutants, so current methods for reducing emissions mainly involve using catalysts within the muffler to react and consume these pollutants. For the catalyst to effectively catalyze the pollutants, a certain amount of fresh air is required in the exhaust gas. In existing technology, the muffler is typically connected to the engine's exhaust pipe, with a supplemental air pipe connected to the exhaust pipe. This supplemental air supply brings fresh air into the engine's exhaust pipe, allowing the exhaust gas to mix with the fresh air before entering the muffler for the reaction.

[0004] Chinese patent document CN110080866A discloses an emission reduction device for a generator set, which includes a muffler connected to the generator set's exhaust pipe, with a supplementary air pipe connected to the exhaust pipe. This prior art achieves air replenishment by connecting a supplementary air pipe to the generator set's exhaust pipe, allowing the exhaust gas to mix with fresh air before entering the muffler.

[0005] In some existing engines, the exhaust pipe cannot be configured, necessitating a direct connection between the muffler and the engine. This means the air intake pipe must also connect directly to the muffler to mix exhaust gases with fresh air. Typically, the air intake pipe is connected to the muffler's silencing chamber, allowing the exhaust gases to enter this chamber first. However, this configuration can easily lead to excessive pollutant emissions during operation. Summary of the Invention

[0006] The purpose of this invention is to provide a muffler to solve the problem that existing mufflers are prone to exceeding emission standards.

[0007] To achieve the above objectives, the basic solution of the present invention provides a muffler and an engine, including a housing, an air intake cavity formed inside the housing, an air inlet communicating with the air intake cavity on the housing, an air intake pipe disposed inside the air intake cavity, one end of the air intake pipe being sealed to the air intake cavity, and a supplementary air pipe passing through the housing, one end of the supplementary air pipe extending into the air intake cavity and directly communicating with the air intake pipe, the supplementary air pipe being sealed to the housing. Preferably, the air intake pipe has a bend, and the connection between the supplemental air pipe and the air intake pipe is located on the outside of the bend.

[0008] Preferably, the connection between the supplemental air pipe and the intake pipe is near the end where the intake pipe connects to the intake port.

[0009] Preferably, the portion of the air intake pipe located away from the air intake at the bend is bent.

[0010] The air supply pipe penetrates the housing at the same side as the air inlet. This arrangement, with both the air supply pipe and the air inlet connected and assembled on the same side of the housing, helps to reduce the space required for muffler installation.

[0011] The present invention also provides an engine comprising any of the above-mentioned mufflers.

[0012] The present invention has the following beneficial effects: 1. An air intake pipe is installed inside the silencer's silencer cavity, and a make-up air pipe is installed on the silencer that is directly connected to the air intake pipe. This allows the make-up air pipe to directly supply fresh air to the air intake pipe, thus avoiding the unstable air supply that can easily occur when the make-up air pipe is connected to the silencer cavity. This ensures the stability of the fresh air supply and helps the silencer to treat pollutants in the exhaust gas, thereby preventing emissions from exceeding standards.

[0013] 2. The bends and bends in the intake pipe prevent pressure fluctuations within the muffler from affecting the air supply, thus improving the stability of the air supply and enhancing the muffler's performance in treating exhaust gases.

[0014] 3. The air intake pipe prevents the exhaust gas entering the silencer chamber from the air intake port from blowing directly onto the baffle, thus avoiding damage to the baffle due to prolonged exposure to the high temperature of the exhaust gas, which helps to improve the service life of the silencer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a muffler embodiment 1 of the present invention; Figure 2 for Figure 1 Sectional view of AA; Figure 3 This is a schematic diagram of embodiment 2 of the silencer of the present invention. Detailed Implementation

[0016] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: partition 1, silencer 2, air inlet pipe 3, bend 31, lower shell 4, air inlet 5, supplementary air pipe 6, and supplementary air conduit 7.

[0017] Example 1: As shown in the attached document Figure 1 and Figure 2 As shown: An engine including a muffler. The muffler includes a housing, and a muffler cavity 2 is formed inside the housing. Figure 1 The diagram shows the lower housing 4 portion of the casing; the upper housing portion is not shown. The casing of the muffler is formed by the interlocking of the upper and lower housings 4, a conventional technique in the art, and will not be elaborated upon here. A partition 1 is provided inside the casing, and the muffler cavity 2 is formed by the partition 1 and the casing. Specifically, in this embodiment, the muffler cavity 2 is formed by the partition 1 surrounding the partition 1. An air inlet 5 communicating with the muffler cavity 2 is provided on the lower housing 4, located on the side of the muffler cavity 2 directly opposite the partition 1. An air inlet pipe 3 is provided inside the muffler cavity 2, with one end of the air inlet pipe 3 sealingly fitted to the air inlet 5. The air inlet pipe 3 has a bend 31, which allows the airflow flowing from the air inlet 5 towards the partition 1 to gradually transition to an airflow flowing approximately parallel to the partition 1. In this embodiment, the portion of the air inlet pipe 3 located away from the air inlet 5 at the bend 31 is bent. In this embodiment, the specific bending is set as a rounded bend at the end of the air intake pipe 3 away from the bending part 31.

[0018] A supplementary air pipe 6 is provided through the lower housing 4, with one end extending into the silencer cavity 2 and directly communicating with the air inlet pipe 3. In this embodiment, the supplementary air pipe 6 is sealed to the lower housing 4. In this embodiment, the connection between the supplementary air pipe 6 and the air inlet pipe 3 is located on the outside of the bend 31. The connection between the supplementary air pipe 6 and the air inlet pipe 3 is close to the end of the air inlet pipe 3 that connects to the air inlet 5, so that the supplementary air pipe 6 can promptly supplement the air inlet pipe 3, thereby allowing the supplemented gas to mix quickly with the original gas in the air inlet pipe 3.

[0019] The specific implementation process is as follows: The exhaust gas from the engine enters the intake pipe 3 inside the muffler's muffler chamber 2 through the intake port 5. The air supply pipe 6 supplements the intake pipe 3 with fresh air through the external air supply conduit 7, so that the exhaust gas and fresh air move and mix in the intake pipe 3. The air supply pipe 6 can stably supply fresh air to the intake pipe 3, so that the catalyst in the muffler can effectively treat the exhaust gas, ensuring the emission effect of the muffler and avoiding the problem of exceeding emission standards.

[0020] Example 2: Figure 3 As shown, the difference from Embodiment 1 is that the air supply pipe 6a penetrates the housing 4 at the same side as the air inlet 5 on the housing 4. This arrangement helps to reduce the space required for muffler installation, thus facilitating use in space-constrained environments.

[0021] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A muffler, comprising a housing, wherein a silencing cavity is formed inside the housing, and an air inlet communicating with the silencing cavity is provided on the housing, characterized in that: An air inlet pipe is provided inside the silencing cavity, and one end of the air inlet pipe is sealed to the air inlet. A supplementary air pipe is provided through the shell, and one end of the supplementary air pipe extends into the silencing cavity and is directly connected to the air inlet pipe. The supplementary air pipe is sealed to the shell.

2. The silencer according to claim 1, characterized in that: The intake pipe has a bend, and the connection between the supplemental air pipe and the intake pipe is located on the outside of the bend.

3. The silencer according to claim 2, characterized in that: The connection between the supplemental air pipe and the intake pipe is near the end where the intake pipe connects to the intake port.

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

5. The silencer according to claim 1, characterized in that: The air supply pipe penetrates the housing at the same side of the housing as the air inlet.

6. An engine, characterized in that: Includes the silencer as described in any one of claims 1 to 5.

Images