CN209430261U - A diesel generator muffler - Google Patents

Abstract

The utility model discloses a diesel generator muffler, which comprises a primary noise reduction structure, a secondary noise reduction structure, an axial flow fan and a casing. The two ends of the casing are respectively connected with an intake pipe and an exhaust pipe. A first mounting plate, a second mounting plate, a third mounting plate and a fourth mounting plate parallel to each other are arranged, and a plurality of Ventilation holes, a first-level anechoic chamber is formed between the first mounting plate and the second mounting plate, a second-level anechoic cavity is formed between the third mounting plate and the fourth mounting plate, and the first-level anechoic structure is arranged in the first-level anechoic cavity, The secondary anechoic structure is arranged in the secondary anechoic cavity, and the axial flow fan is arranged between the second mounting plate and the third mounting plate. The utility model not only ensures the noise reduction effect on the generator, but also makes the gas circulation in the silencer smooth, and effectively prevents environmental noise pollution.

Description

A diesel generator muffler

technical field

The utility model relates to the technical field of motor noise reduction, in particular to a diesel generator noise reduction device.

Background technique

Diesel generator sets will inevitably produce noise during operation. If the necessary noise reduction measures are not taken, the noise generated by the unit will cause serious damage to the surrounding environment. Therefore, a muffler is usually installed at the exhaust end of the generator to reduce the exhaust noise of the generator. The muffler of the existing diesel generator adopts a single-section straight-type muffler, the internal structure is unreasonable, and the muffler is 10-25dB (A), which cannot solve the problem of noise emission up to the standard.

Utility model content

The purpose of the utility model is to provide a muffler for a diesel generator, which can enhance the muffler effect and realize the discharge of generator noise up to the standard.

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A diesel generator muffler, comprising a primary noise reduction structure, a secondary noise reduction structure, an axial flow fan and a casing, the two ends of the casing are respectively connected to an intake pipe and an exhaust pipe, and the casing is provided with mutually parallel The first mounting plate, the second mounting plate, the third mounting plate and the fourth mounting plate are all provided with a plurality of ventilation holes on the first mounting plate, the second mounting plate, the third mounting plate and the fourth mounting plate, the first A primary anechoic chamber is formed between the mounting plate and the second mounting plate, a secondary anechoic cavity is formed between the third mounting plate and the fourth mounting plate, the primary anechoic structure is set in the primary anechoic cavity, and the secondary anechoic structure It is arranged in the secondary anechoic chamber, and the axial flow fan is arranged between the second mounting plate and the third mounting plate.

Both the first-level noise reduction structure and the second-level noise reduction structure include a plurality of broken-line sound-absorbing sheets, and the plurality of broken-line sound-absorbing sheets of the first-level noise reduction structure are arranged in parallel between the first mounting plate and the second mounting plate In between, a plurality of broken-line sound-absorbing sheets of the secondary sound-absorbing structure are arranged in parallel between the third mounting plate and the fourth mounting plate.

The shell includes a horizontal shell and a vertical shell, the vertical shell is provided with a horizontal baffle, and the horizontal baffle is provided with a plurality of ventilation holes, and the horizontal baffle divides the inside of the vertical shell into an air intake cavity and a transition cavity, the horizontal shell communicates with the transition cavity of the vertical shell, the air intake cavity of the vertical shell is connected with an air intake pipe, and the side of the horizontal shell away from the vertical shell is connected with an exhaust pipe. The sound attenuation structure, the secondary sound attenuation structure and the axial flow fan are all arranged in the horizontal casing.

A filling layer of sound-absorbing material is provided on the inner wall of the air intake chamber of the vertical housing.

The sound-absorbing material filling layer is a glass fiber wool filling layer.

The utility model increases the amount of noise elimination by arranging two sections of noise reduction structures, and at the same time utilizes the axial flow fan between the two sections of noise elimination structures to optimize the aerodynamic characteristics inside the muffler and reduce resistance, and is especially suitable for generators away from the factory boundary. Nearby, where the noise is difficult to control.

The noise reduction structure of the utility model adopts a broken-line noise reduction sheet, which avoids the direct impact of the noise, and uses the incident, refraction, reflection, interference, variable speed and frequency shift of the sound wave to absorb and attenuate the sound energy, and effectively reduce the noise in the 63~8000HZ frequency band. The noise reduction is increased to 40~50dB(A).

The shell of the utility model is provided with a vertical shell and a horizontal shell that communicate with each other, so that the exhaust gas of the generator first passes through the air intake chamber of the vertical shell for noise reduction, and then enters the first-stage muffler chamber and the second-stage muffler chamber of the horizontal shell through the transition chamber. The advanced anechoic chamber eliminates noise, which further improves the noise reduction effect.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

As shown in Figure 1, a kind of diesel generator muffler described in the utility model includes a primary noise reduction structure, a secondary noise reduction structure, an axial flow fan 6 and a casing, and the two ends of the casing are respectively connected with an intake pipe 1 and a The exhaust pipe 10 is provided with a first mounting plate 2, a second mounting plate 5, a third mounting plate 7 and a fourth mounting plate 8 parallel to each other in the shell, the first mounting plate 2, the second mounting plate 5, the third mounting plate Both the mounting plate 7 and the fourth mounting plate 8 are provided with a plurality of ventilation holes, and a first-level anechoic chamber 3 is formed between the first mounting plate 2 and the second mounting plate 5, and between the third mounting plate 7 and the fourth mounting plate 8 A secondary anechoic cavity 9 is formed between them, the primary anechoic structure is set in the primary anechoic cavity 3, the secondary anechoic structure is set in the secondary anechoic cavity 9, and the axial flow fan 6 is set in the second mounting plate 5 and the third between the mounting plates 7.

The ventilation holes on the first mounting plate 2, the second mounting plate 5, the third mounting plate 7 and the fourth mounting plate 8 make the shell form a continuous air flow passage, the exhaust gas of the generator enters the muffler from the intake pipe 1, and first passes through a The first-stage muffler structure in the first-stage muffler chamber 3 silences the noise, and then the axial flow fan 6 provides gas circulation power, so that the gas quickly enters the second-stage muffler chamber 9, uses the second-stage muffler structure to silence the noise, and finally discharges through the exhaust pipe 10. It not only ensures the noise reduction effect, but also makes the gas flow smoothly.

In this embodiment, the first-level noise reduction structure and the second-level noise reduction structure both include a plurality of broken-line sound-absorbing sheets 4, and a plurality of broken-line sound-absorbing sheets 4 of the first-level noise reduction structure are arranged in parallel on the first mounting plate 2 and the second mounting plate 2. Between the two mounting plates 5 , a plurality of broken-line sound-absorbing sheets 4 of the secondary sound-absorbing structure are arranged in parallel between the third mounting plate 7 and the fourth mounting plate 8 . When the exhaust gas enters the muffler chamber, the zigzag-shaped muffler sheet 4 can cause sound waves to refract, reflect, interfere, change speed, and shift frequency, thereby attenuating sound energy and reducing noise.

The shell of the present embodiment comprises a horizontal shell 11 and a vertical shell 12, and the vertical shell 12 is provided with a horizontal baffle 14, and the horizontal baffle 14 is provided with a plurality of air holes, and the horizontal baffle 14 connects the vertical shell. The interior of the body 12 is divided into an air inlet chamber 15 and a transition chamber 16. The inner wall of the air inlet chamber 15 is provided with a sound-absorbing material filling layer 13, and the sound-absorbing material filling layer 13 can be a glass fiber filling layer, a polyester fiber filling layer or a glass fiber filling layer. Fiber cotton filling layer, etc. The horizontal housing 11 is in communication with the transition chamber 16 of the vertical housing 12, the air intake pipe 1 is connected to the air intake chamber 15 of the vertical housing 12, the exhaust pipe 10 is connected to the side of the horizontal housing 11 away from the vertical housing 12, The primary noise reduction structure, the secondary noise reduction structure and the axial flow fan 6 are all arranged in the horizontal casing 11 .

The exhaust gas of the generator enters the vertical casing 12, and is initially silenced by the filling layer in the intake chamber 15, then enters the transition chamber 16 through the horizontal partition 14, changes the flow direction in the transition chamber 16, and enters the horizontal casing in sequence The first-level anechoic cavity 3 and the secondary anechoic cavity 9 of 11 carry out deep noise reduction.

The working principle of the utility model is: the tail gas of the generator enters the muffler from the intake pipe 1, first absorbs part of the noise by the intake cavity 15 on the upper part of the vertical shell 12, then changes the flow direction through the transition cavity 16, and enters the horizontal shell 11, the first-stage anechoic cavity 3 is made of a plurality of zigzag-shaped anechoic sheets 4 to cause reflection and interference effects of sound waves, thereby reducing noise to a certain extent; under the action of the axial flow fan 6, the Exhaust gas maintains a certain flow rate and enters the secondary muffler chamber 9 through the air holes on the mounting plate, and is further muffled and denoised by a plurality of zigzag mufflers 4 , and finally discharged through the exhaust pipe 10 .

The utility model not only ensures the noise reduction effect on the generator, but also makes the gas circulation in the silencer smooth, effectively preventing and controlling environmental noise pollution.

Claims (5)

1. A diesel generator muffler, characterized in that: comprise a primary noise reduction structure, a secondary noise reduction structure, an axial flow fan and a casing, the two ends of the casing are respectively connected with an intake pipe and an exhaust pipe, and the casing There are a first mounting plate, a second mounting plate, a third mounting plate and a fourth mounting plate parallel to each other inside, and the first mounting plate, the second mounting plate, the third mounting plate and the fourth mounting plate are provided with multiple A ventilation hole, a first-level anechoic cavity is formed between the first mounting plate and the second mounting plate, a second-level anechoic cavity is formed between the third mounting plate and the fourth mounting plate, and the primary anechoic structure is arranged in the first-level anechoic cavity , the secondary anechoic structure is set in the secondary anechoic cavity, and the axial flow fan is set between the second mounting plate and the third mounting plate. 2. A diesel generator muffler according to claim 1, characterized in that: the first-level noise reduction structure and the second-level noise reduction structure both include a plurality of broken-line noise reduction pieces, and the first-level noise reduction structure A plurality of broken-line sound-absorbing sheets are arranged in parallel between the first mounting plate and the second mounting plate, and a plurality of broken-line sound-absorbing sheets of the secondary sound-absorbing structure are arranged in parallel between the third mounting plate and the fourth mounting plate. 3. A diesel generator muffler according to claim 2, characterized in that: the housing includes a horizontal casing and a vertical casing, a horizontal partition is arranged inside the vertical casing, and a horizontal partition is provided on the horizontal partition. A plurality of ventilation holes, the horizontal partition divides the interior of the vertical shell into an air intake cavity and a transition cavity, the horizontal shell communicates with the transition cavity of the vertical shell, the air intake cavity of the vertical shell is connected with an air intake pipe, and the horizontal shell An exhaust pipe is connected to the side of the body away from the vertical housing, and the first-stage noise reduction structure, the second-stage noise reduction structure and the axial flow fan are all arranged in the horizontal housing. 4. A diesel generator muffler according to claim 3, characterized in that: a sound-absorbing material filling layer is arranged on the inner wall of the air intake cavity of the vertical housing. 5. A diesel generator muffler according to claim 4, characterized in that: the sound-absorbing material filling layer is a glass fiber wool filling layer.