CN219017233U - Exhaust muffler - Google Patents

Abstract

The utility model provides an exhaust muffler which is characterized by comprising a shell, an air inlet straight pipe, a partition plate and a small hole injection pipe, wherein the inner wall of the shell is covered with a resistive sound absorption structure, the partition plate divides a cavity of the shell into a first cavity and a second cavity, one end of the air inlet straight pipe penetrates through an end plate of the shell to penetrate through the first cavity and then penetrates through the partition plate to extend to the second cavity, the small hole injection pipe is connected with the second cavity, a first end plate is arranged at a pipe orifice of one end of the small hole injection pipe far away from the air inlet straight pipe, a large number of holes are formed in the first end plate, a large number of holes are formed in the end plate of the shell close to the small hole injection pipe, and a plurality of silencing structures are arranged at the part of the air inlet straight pipe penetrating through the first cavity. The utility model can reduce the energy and the pressure of the high-pressure and high-noise air flow and discharge the air flow by arranging a plurality of silencing structures to attenuate the sound energy, jetting two small holes to reduce the air pressure of the silencing structures and absorbing the sound energy by the resistive sound absorption structure, thereby effectively improving the silencing effect and simultaneously effectively reducing the air pressure of the exhaust.

Description

Exhaust muffler

Technical Field

The utility model relates to an exhaust muffler, and belongs to the technical field of mufflers.

Background

High-pressure exhaust noise is commonly present in factories, and when high-pressure gas is exhausted from an exhaust port at a high speed, extremely strong vibration and noise are often accompanied, so that the high-pressure exhaust noise is harmful to the health of operators, and pollutes the environment of the factories and even the environment outside the factories. Aiming at high-pressure emptying noise, a diffusion decompression silencing or small-hole injection silencing device is conventionally adopted, so that the device is large in size, consumes more steel, is high in airflow resistance and cannot meet the use requirement.

Disclosure of Invention

The utility model aims to overcome the technical defects and provide the exhaust muffler which eliminates sound energy, resistive noise elimination through a pipeline, and discharges high-pressure high-noise airflow after energy dissipation and pressure reduction after orifice injection and pressure reduction.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

the utility model firstly provides a sound absorbing device which comprises a shell, an air inlet straight pipe, a baffle plate and a small hole injection pipe, wherein the inner wall of the shell is covered with a sound absorbing resistive structure, the baffle plate divides a cavity of the shell into a first cavity and a second cavity, one end of the air inlet straight pipe penetrates through an end plate of the shell to penetrate through the first cavity and then penetrates through the baffle plate to extend to the second cavity, the small hole injection pipe is connected with the small hole injection pipe, a first end plate is arranged at a pipe orifice of one end of the small hole injection pipe far away from the air inlet straight pipe, a large number of holes are formed in the first end plate, a large number of holes are formed in the end plate of the shell close to the small hole injection pipe, and a plurality of sound absorbing structures are arranged at a part of the air inlet straight pipe penetrating through the first cavity.

Preferably, each of the silencing structures comprises a silencing hole arranged on the wall of the air inlet straight pipe in the first cavity, and a silencing pipeline with one end connected with the silencing hole and the other end connected with the resistive sound absorbing structure.

Preferably, the number of the silencing structures is two.

Preferably, the air inlet straight pipe, the small hole injection pipe and the second cavity are coaxial.

Preferably, the resistive sound absorbing structure comprises a perforated panel and sound absorbing cotton, the sound absorbing cotton is covered on the inner wall of the outer shell, and the perforated panel is covered on the sound absorbing cotton.

Preferably, the housing is a hollow cylindrical structure.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model has the advantages that the air inlet straight pipe, the small hole injection pipe and the second cavity are coaxially arranged, the air flow resistance is small, so that the gas can pass more smoothly, the silencing effect is further improved, the structure is compact, the silencing effect is ensured, and the volume is effectively reduced.

Drawings

Fig. 1 is a cross-sectional view of the present utility model.

Reference numerals: the sound absorption device comprises a shell 1, sound absorption cotton 2, a perforated panel 3, an air inlet straight pipe 4, a sound absorption mechanism 5, a first cavity 6, a partition 7, a small-hole injection pipe 8 and a second cavity 9.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if there is a directional indication (such as up, down, left, right, front, rear.

Furthermore, if the description of "first," "second," etc. is referred to in this disclosure, it is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1, the exhaust muffler provided by the utility model is characterized by comprising a housing 1, an air inlet straight pipe 4, a partition 7 and a small hole injection pipe 8, wherein the inner wall of the housing 1 is covered with a resistive sound absorption structure, the partition 7 divides the cavity of the housing 1 into a first cavity 6 and a second cavity 9, the resistive sound absorption structure on the inner wall of the housing of the second cavity effectively absorbs sound energy, one end of the air inlet straight pipe 4 penetrates through an end plate of the housing 1 and then penetrates through the partition 7 to extend to the second cavity 9 to be connected with the small hole injection pipe 8, one end pipe orifice of the small hole injection pipe 8 far away from the air inlet straight pipe 4 is provided with a first end plate, a large number of holes are formed in the first end plate, the end plate of the housing 1 close to the small hole injection pipe 8 is provided with a large number of holes, the small hole injection pipe 8 and the end plate provided with a large number of holes of the housing 1 form two small hole injection pipes, the high-pressure high-noise-absorbing structure is used for reducing high-pressure high-noise-level air flow, the air inlet straight pipe 4 penetrates through the first cavity 6 and penetrates through the large-volume of the small-volume high-volume sound absorbing structure 5, and the high-damping structure is required to be effectively attenuated according to the high-noise-damping structure is required to be arranged.

Further, each of the silencing structures 5 includes a silencing hole formed in the wall of the air inlet straight pipe 4 in the first cavity 6, and a silencing pipe with one end connected to the silencing hole and the other end connected to the resistive sound absorbing structure, the high-pressure high-noise air flow enters the silencing hole and then further enters the silencing pipe, and the sound energy of the incident sound wave and the sound energy of the reflected sound wave are superimposed to effectively attenuate the sound energy, and meanwhile, the resistive sound absorbing structure effectively absorbs the sound energy.

Optionally, the number of the silencing structures 5 is two, and the number of the silencing structures is set according to actual conditions.

Preferably, the air inlet straight pipe 4, the small-hole injection pipe 8 and the second cavity 9 are coaxial, so that the air flow resistance is small, and the air passing is smoother.

Optionally, the resistive sound absorbing structure includes a perforated panel 3 and sound absorbing cotton 2, the sound absorbing cotton 2 is covered on the inner wall of the casing 1, the perforated panel 3 is covered on the sound absorbing cotton 2, and the sound absorbing cotton effectively absorbs sound energy.

Optionally, the shell 1 is of a hollow cylindrical structure, and the structure of the shell is set according to the requirement.

When high-pressure high-noise air flow enters from the air inlet straight pipe 4 and passes through the silencing mechanism 5, the sound energy is attenuated, the quantity of the silencing mechanisms 5 is set according to actual needs, the air flow after the sound energy attenuation is decompressed through the small-hole injection pipe 8 and then enters the second cavity 9, the sound absorption cotton 2 on the inner wall of the outer shell of the second cavity 9 effectively absorbs the sound energy of the air flow, and the air flow after the energy dissipation and decompression is discharged after being further decompressed through the end plate of the outer shell 1 provided with a large number of holes, so that the effective silencing effect is achieved.

The utility model effectively reduces the volume while guaranteeing the silencing effect, and can be used in the air inlet and exhaust structures of boilers, roots fans, internal combustion engines and other equipment in industrial production.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (6)

1. The utility model provides an exhaust silencer, its characterized in that, including shell (1), inlet tube (4), baffle (7) and aperture injection tube (8), the inner wall of shell (1) all covers resistive sound absorbing structure, baffle (7) separate the cavity of shell (1) into first cavity (6) and second cavity (9), the one end that inlet tube (4) passed through the one end board of shell (1) runs through behind first cavity (6) and passes baffle (7) and extend to second cavity (9) and be connected with aperture injection tube (8), the one end mouth of pipe that inlet tube (4) were kept away from to aperture injection tube (8) is provided with first end plate, a large amount of holes have been seted up to the end plate that shell (1) is close to aperture injection tube (8), the part that inlet tube (4) run through first cavity (6) is provided with a plurality of sound absorbing structure (5).

2. An exhaust muffler according to claim 1, characterized in that each of the sound-attenuating structures (5) comprises a sound-attenuating aperture provided in the wall of the inlet straight tube (4) in the first cavity (6), a sound-attenuating duct connected at one end to the sound-attenuating aperture and at the other end to the resistive sound-absorbing structure.

3. An exhaust muffler according to claim 2, characterized in that the number of the sound-damping structures (5) is two.

4. An exhaust muffler according to claim 3, characterized in that the inlet straight pipe (4), the orifice injection pipe (8) and the second cavity (9) are coaxial.

5. The exhaust muffler according to claim 4, wherein the resistive sound absorbing structure comprises a perforated panel (3) and sound absorbing cotton (2), the sound absorbing cotton (2) being covered on an inner wall of the outer shell (1), the perforated panel (3) being covered on the sound absorbing cotton (2).

6. The exhaust muffler according to claim 5, characterized in that the housing (1) is of hollow cylindrical structure.

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