CN210948864U - Silencer wind scooper for general gasoline engine - Google Patents

Abstract

The utility model discloses a lead to quick-witted silencer wind scooper of using, including silencer wind scooper body (2) inner chamber is provided with silencer body (1) be provided with a plurality of bloops (3) on silencer wind scooper body (2) just be located bloop (3) department on the outer wall or the inner wall of silencer wind scooper body (2) and be provided with the cotton (4) of inhaling of covering bloop (3) region. The utility model has the advantages of simple structure, use reliably, low cost, adopt it to make in the silencer high-frequency noise that high-speed air current produced and because of the silencer vibration most noise is fixed inhales the sound cotton and absorbs after the medium-high frequency noise radiation that the surface produced, reached noise reduction effect, improved user's travelling comfort.

Description

Silencer wind scooper for general gasoline engine

Technical Field

The utility model relates to a general engine, especially a silencer wind scooper for general engine.

Background

With the development of general engine technology, the interest of users on engines gradually shifts from dynamic nature to comfort in use, such as noise, vibration, man-machine interaction and the like, wherein the noise is one of important factors influencing the comfort in use. The noise sources are mainly classified into intake noise, exhaust noise, and mechanical noise; as exhaust muffler technology has advanced in recent years, there has been great progress in reducing the noise of exhaust noise caused by mufflers, but there has been little interest in reducing the noise of muffler covers.

For a general engine, the structure of the whole engine from inside to outside is an engine (including a silencer), a wind scooper and a whole engine outer cover. The inner surface and the outer surface of the common silencer wind scooper are smooth, the main functions of the common silencer wind scooper are wind guiding and heat insulation, and the common silencer wind scooper also has a sound insulation effect to a certain extent. Because the silencer is completely covered by the air guide cover and the inner and outer surfaces are smooth, most of high-frequency noise generated by high-speed flow of tail gas in the silencer and medium-high frequency noise generated by surface vibration of the silencer cannot penetrate through the air guide cover, are reflected and superposed back and forth in the inner space of the air guide cover and finally are diffused to the outside at the air outlet.

In order to solve the problem, the common solution is to paste sound-deadening and heat-insulating cotton on the inner wall or the outer wall of the silencer, but the sound-deadening effect is not obvious.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a silencer wind scooper for general engine that noise reduction effect is good.

The utility model aims at realizing through such technical scheme, a silencer wind scooper for general engine, including silencer wind scooper body inner chamber is provided with the silencer body be provided with a plurality of bloops on the silencer wind scooper body just be located on the outer wall or the inner wall of silencer wind scooper body that the hole department that just lies in is provided with the sound of inhaling that covers the amortization hole region cotton.

The silencing hole is located in the area, close to the silencer body, on the silencer air guide cover body.

Further, the diameter of each silencing hole is 5 mm-12 mm.

In order to enhance the noise reduction effect, the area of the holes of the muffling hole accounts for 60-80% of the area of the corresponding muffler wind scooper body near the periphery of the muffler body.

Further, in order to increase the heat insulation effect, the sound absorption cotton is arranged on the outer wall of the silencer air guide cover body, and a shell which covers the sound absorption cotton and is fixed on the silencer body is arranged on the outer side of the sound absorption cotton.

Since the technical scheme is used, the utility model has the advantages of simple structure, use reliably, low cost, adopt it to make the high frequency noise that high velocity air produced in the silencer and because of the silencer vibration most noise is fixed inhales the sound cotton absorption behind the medium-high frequency noise radiation that the surface produced, reached noise reduction effect, improved user's travelling comfort.

Drawings

The drawings of the utility model are as follows:

fig. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

FIG. 4 is a second schematic structural diagram of the present invention;

FIG. 5 is a cross-sectional view C-C of FIG. 4;

fig. 6 is a cross-sectional view taken along line D-D of fig. 4.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention as claimed in the appended claims.

Example 1: as shown in fig. 1, 2 and 3, the silencer air guide cover for the general engine comprises a silencer air guide cover body 2, wherein a silencer body 1 is arranged in an inner cavity of the silencer air guide cover body 2, and the silencer air guide cover is characterized in that: the silencer wind scooper body 2 is provided with a plurality of silencing holes 3, and sound absorbing cotton 4 covering the silencing holes 3 is arranged on the outer wall or the inner wall of the silencer wind scooper body 2 and located at the silencing holes 3.

Further, the silencing hole 3 is positioned on the silencer wind scooper body 2 and is close to the area of the silencer body 1; the approach described here is closest to the muffler body 1 relative to the other regions.

In the utility model, the diameter of each silencing hole 3 is 5 mm-12 mm.

In order to further increase the noise reduction effect, the opening area of the silencing hole 3 accounts for 60-80% of the area of the corresponding silencer air guide cover body 2 close to the periphery of the silencer body 1.

In the utility model, high-frequency noise generated by high-speed airflow in the silencer body 1 and most of the noise generated by the vibration of the silencer body 1 after medium-high frequency noise radiation enter the sound-absorbing cotton 4 through the sound-absorbing hole 3, and sound waves are absorbed by the sound-absorbing cotton 4, thereby playing a better sound-absorbing effect and reducing the noise; meanwhile, the muffling hole 3 and the outer wall form a Helmholtz combined resonator, so that a good sound absorption effect is achieved on low-frequency noise.

Example 2: as shown in fig. 4, 5 and 6, the sound-absorbing cotton 4 is provided on the outer wall of the muffler air guide cover body 2, and a casing 5 fixed to the muffler body 1 so as to cover the sound-absorbing cotton 4 is provided outside the sound-absorbing cotton 4.

Because the sound-absorbing cotton 4 has certain thickness and density, the hollowed-out silencer wind scooper body 2 still has a heat insulation effect, and hot cooling air at the periphery of an engine can be prevented from being diffused to the area between the silencer wind scooper body 2 and the whole machine outer cover, so that the phenomenon that the air temperature in the inner space of the generator set shell is increased to influence the performance is avoided; meanwhile, the shell 5 completely isolates the heat of the silencer body 1 from being transmitted outwards through the radiating holes.

At half anechoic test room, use LMS noise test analytic system, according to 2005/88 CE noise instruction and ISO3744-2010 acoustics sound pressure method survey noise source sound power level-the engineering method of approximate free field above the plane of reflection "respectively to the former machine of same general plane with the utility model discloses carry out the noise contrast test, test data is as follows:

Claims (5)

1. the utility model provides a silencer wind scooper for general gasoline engine, includes silencer wind scooper body (2), be provided with silencer body (1) in silencer wind scooper body (2) inner chamber, characterized by: the silencer wind scooper is characterized in that a plurality of silencing holes (3) are formed in the silencer wind scooper body (2), and sound absorbing cotton (4) covering the silencing holes (3) are arranged on the outer wall or the inner wall of the silencer wind scooper body (2) and located at the silencing holes (3).

2. The air guide cover of the general engine muffler as set forth in claim 1, wherein: the silencing hole (3) is located on the silencer air guide cover body (2) and is close to the area of the silencer body (1).

3. The air guide cover of the general engine muffler as set forth in claim 2, wherein: the diameter of each silencing hole (3) is 5-12 mm.

4. The air guide cover of the general engine muffler as defined in claim 3, wherein: the area of the opening of the silencing hole (3) accounts for 60-80% of the area of the corresponding silencer wind scooper body (2) close to the periphery of the silencer body (1).

5. The air guide cover of the general engine muffler as defined in claim 4, wherein: the sound absorption cotton (4) is arranged on the outer wall of the silencer air guide cover body (2), and a shell (5) which covers the sound absorption cotton (4) and is fixed on the silencer body (1) is arranged on the outer side of the sound absorption cotton (4).

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