CN2816373Y

CN2816373Y - Heavy automobile boosted diesel engine exhausting silencer

Info

Publication number: CN2816373Y
Application number: CN 200520009789
Authority: CN
Inventors: 林辉江
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-16
Filing date: 2005-08-16
Publication date: 2006-09-13
Anticipated expiration: 2015-08-16

Abstract

The utility model relates to a heavy automobile boosted diesel engine exhausting silencer, which is characterized in that an inner cavity has four chambers of different sizes; a first intermediate silencing pipe (8) is arranged between the first chamber and the second chamber; a second intermediate silencing pipe (9) is arranged between the second chamber and the third chamber; a ventilating pipe (8) is arranged between the third chamber and the fourth chamber; the total area of small holes on each of the silencing pipes is larger than the section area of the silencing pipe; the total area of the small holes (1a) on an air inlet silencing pipe (1) is larger than the total area of the small holes (8a) on the first intermediate silencing pipe (8) or the total area of the small holes (9a) on the second intermediate silencing pipe (9); the total area of the small holes (8a) on the first intermediate silencing pipe (8) or the total area of the small holes (9a) on the second intermediate silencing pipe (9) is larger that the total area of the small holes (2a) on an exhaust silencing pipe (2). The utility model has the advantages of large insertion loss, small power loss and small exhaust pressure loss, and the utility model has an obvious lowering effect on air flow noise of each frequency band in exhausted air of the heavy automobile boosted diesel engine.

Description

A kind of heavy-duty car supercharged diesel engine exhaust silencer

Technical field

The utility model relates to silencing apparatus, especially a kind of heavy-duty car supercharged diesel engine exhaust silencer.

Background technique

China's heavy-duty car adopts 240～450PS supercharged diesel engine mostly at present, with general resistive structure or the impedance complex structure of adopting of its equipped mutually silencing apparatus, hush tube all is through-pipe structure, both ends open, and usually only with a pipe, perforate is " well " font on the pipe.It is less that it inserts loss (sound deadening capacity), shellfish to tens decibel in a measure only, do not satisfy the requirement of national GB1495-2002 standard, the power loss ratio that has is very big, oil consumption very, and the exhaust pressure that has loss is excessive, reaches tens kPas (KPa), influence the proper functioning of turbosupercharger, thereby engine performance is worsened.

The model utility content

It is big that the purpose of this utility model provides a kind of insertion loss (sound deadening capacity), and power loss ratio is little, the heavy-duty car supercharged diesel engine exhaust silencer that the exhaust pressure loss is little.

For this reason, heavy-duty car supercharged diesel engine exhaust silencer described in the utility model, comprise inlet and outlet hush tube, forward and backward end cap and housing, the silencing apparatus inner chamber that forward and backward end cap and housing form is divided into four chambers by lateral partitions that intersects vertically and vertical dividing plate, wherein the I chamber is greater than the IV chamber, the IV chamber is greater than the II chamber, and the II chamber is greater than the III chamber; The intake noise reduction pipe stretches into the I chamber from front cover, and its inner sealing, the I chamber is communicated with by the first middle hush tube with the II chamber, the II chamber is communicated with by the second middle hush tube with the III chamber, the III chamber is communicated with by breathing pipe or hole with the IV chamber, the exhausting silencer caliber stretches in the IV chamber to passing housing, and its inner sealing; Be equipped with aperture on each hush tube, the gross area of aperture is greater than the sectional area of place hush tube separately on each hush tube, the gross area of aperture is greater than the gross area of aperture on the hush tube in the middle of the aperture or second on the hush tube in the middle of first on the intake noise reduction pipe, in the middle of first on the hush tube in the middle of the aperture or second on the hush tube gross area of aperture greater than the gross area of aperture on the exhausting silencer pipe.

The silencing apparatus inner chamber is divided into four chambers that vary in size in the utility model, have many apertures on the tube wall of each hush tube, by " throttling " effect of aperture on each hush tube and their tube walls and " the gas storage storage is pressed " effect of each chamber, make the high temperature and high speed pulse pneumatic that enters silencing apparatus be changed the steady air flow lower into temperature, that airspeed is lower, thereby the strong noise value that the high speed pulse pneumatic is produced drops to lower noise figure, reaches the purpose of noise reduction.Air-flow is when the aperture of each root hush tube enters the place chamber, and airflow direction all changes 90 °, because air-flow and sound wave stream direction in silencing apparatus constantly change, air-flow and sound wave stream is broken away from, and has part to be opposite direction to move.Like this, the damping coefficient of sound wave increases, and noise descends.Because the effect of aperture on each hush tube, a big strand air-flow is dispersed into the ejection of hundreds of thigh little airflow and enters each chamber, and enters the next stage hush tube with suction, is subjected to the rubbing action of hole wall in the sound wave transmittance process, and noise descends.In addition, because each pipe is gone up air-flow (sound wave) of aperture ejection phase difference is arranged, crest and the trough part of can cancelling out each other also can reach the purpose of noise reduction.

The beneficial effects of the utility model are: insert loss (sound deadening capacity) greatly, power loss ratio is little, and the exhaust pressure loss is little, and the pneumatic noise of the heavy-duty car supercharged diesel engine being discharged each frequency range in the gas all has remarkable reduction effect.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A-A sectional view of Fig. 1.

Among the figure: hush tube 8 aperture 8a second middle hush tube 9 aperture 9a breathing pipes or hole 10 sound-absorbing materials, 11 guard shields, the 12 hole 12a in the middle of the intake noise reduction pipe 1 aperture 1a exhausting silencer pipe 2 aperture 2a front covers 3 rear end covers 4 housings 5 lateral partitions 6 vertical dividing plates 7 first

Embodiment

As shown in Figure 1 and Figure 2, forward and backward end cap 3 of the present utility model and 4 and the silencing apparatus inner chamber that forms of housing 5 be divided into four chambers by lateral partitions 6 that intersects vertically and vertical dividing plate 7, wherein the I chamber is greater than the IV chamber, and the IV chamber is greater than the II chamber, and the II chamber is greater than the III chamber.Intake noise reduction pipe 1 stretches into the I chamber from front cover 3, and its inner sealing, the I chamber is communicated with by the first middle hush tube 8 with the II chamber, the II chamber is communicated with by the second middle hush tube 9 with the III chamber, the III chamber is communicated with by breathing pipe or hole 10 with the IV chamber, exhausting silencer pipe 2 radially passes housing 5 and stretches in the IV chamber, and its inner sealing.Be equipped with aperture on each hush tube, the gross area of aperture is greater than the sectional area of place hush tube separately on each hush tube, the gross area of aperture 1a is greater than the gross area of aperture 9a on the hush tube 9 in the middle of the aperture 8a or second on the hush tube 8 in the middle of first on the intake noise reduction pipe 1, in the middle of first on the hush tube 8 in the middle of the aperture 8a or second on the hush tube 9 gross area of aperture 9a greater than the gross area of aperture 2a on the exhausting silencer pipe 2.

The inner that Fig. 1 illustrates intake noise reduction pipe 1 is fixed on the vertical dividing plate 7, the inner of exhausting silencer pipe 2 is fixed on the lateral partitions 6, one end opening of the first middle hush tube 8 also passes vertical dividing plate 7 and stretches in the I chamber, the other end sealing also is fixed on the rear end cover 4, one end opening of the second middle hush tube 9 also passes lateral partitions 6 and stretches in the II chamber, and the other end sealing also is fixed on the housing 5.Be that each hush tube all adopts one to disconnect the structure of mouth, end sealing, and all adopt 2 points (or more than 2) means of fixation, make each hush tube firmly, reliably.

Fig. 1 also illustrates, and inboard and housing 5 inwalls in the forward and backward end cap 3 of silencing apparatus and 4 are lined with sound-absorbing material 11 and guard shield 12, and the porose 12a that distributes on the guard shield 12 is with the middle and high audio-frequency noise in the further elimination exhaust.

The cross section that Fig. 2 the illustrates silencing apparatus ellipse that is as the criterion, the oval external frame of this standard is made up of the camber line of two straight lines, four fillets and two evaginations, hush tube 8 and silencing apparatus axis parallel in the middle of the intake noise reduction pipe 1 and first, hush tube 9 is vertical with the silencing apparatus shaft axis in the middle of the exhausting silencer pipe 2 and second.

Working principle: as shown in Figure 1, the high temperature and high speed pulse pneumatic of being discharged by diesel engine enters after the intake noise reduction pipe 1 the aperture 1a ejection from this hush tube, expands in the I chamber, buffering; Gas in the I chamber enters from the opening end of the first middle hush tube 8, and the aperture 8a from this hush tube sprays expansion in the II chamber, buffering; Gas in the II chamber enters from the opening end of the second middle hush tube 9, and the aperture 9a from this hush tube sprays expansion in the III chamber, buffering; Gas in the III chamber enter in the IV chamber by breathing pipe or hole 10 expand, buffering, the aperture 2a from the exhausting silencer pipe 2 sucks at last, enters atmosphere through exhausting silencer pipe 2.Because " the gas storage storage is pressed " effect of " throttling " of aperture effect and each chamber on each hush tube and each hush tube, the high temperature and high speed pulse pneumatic that enters in the silencing apparatus is transformed into the more stable air-flow that temperature is lower, airspeed is lower, thereby the strong noise value that the high speed pulse pneumatic is produced drops to lower noise figure, reaches the purpose of noise reduction; Because each hush tube all makes airflow direction change 90 °, the process of gas from intake noise reduction pipe 1 to exhausting silencer pipe 2, air-flow and sound wave flow path direction constantly change, and air-flow and sound wave stream is broken away from, and have part to be the opposite direction motion.Like this, the damping coefficient of sound wave increases, and noise descends.Because each hush tube all adopts spray or suction structure, a big strand air-flow is dispersed into the ejection of hundreds of thigh little airflow, be subjected to the rubbing action of little hole wall in the sound wave transmittance process, noise descends.In addition, because the air-flow (sound wave) of aperture ejection has phase difference on each hush tube, crest and the trough part of can cancelling out each other, thus help noise reduction.

Claims

1, a kind of heavy-duty car supercharged diesel engine exhaust silencer comprises inlet and outlet hush tube (1,2), forward and backward end cap (3,4) and housing (5), it is characterized in that:

A, forward and backward end cap (3,4) are divided into four chambers with the silencing apparatus inner chamber that housing (5) forms by lateral partitions that intersects vertically (6) and vertical dividing plate (7), wherein the I chamber is greater than the IV chamber, the IV chamber is greater than the II chamber, and the II chamber is greater than the III chamber;

B, intake noise reduction pipe (1) stretch into the I chamber from front cover (3), and its inner sealing, the I chamber is communicated with by the first middle hush tube (8) with the II chamber, the II chamber is communicated with by the second middle hush tube (9) with the III chamber, the III chamber is communicated with by breathing pipe or hole (10) with the IV chamber, exhausting silencer pipe (2) radially passes housing (5) and stretches in the IV chamber, and its inner sealing;

Be equipped with aperture on C, each hush tube, the gross area of aperture is greater than the sectional area of place hush tube separately on each hush tube, the gross area that intake noise reduction pipe (1) is gone up aperture (1a) is gone up the gross area that hush tube (9) in the middle of aperture (8a) or second is gone up aperture (9a) greater than hush tube (8) in the middle of first, and hush tube (8) is gone up hush tube (9) in the middle of aperture (8a) or second and gone up the gross area of aperture (9a) is gone up aperture (2a) greater than exhausting silencer pipe (2) the gross area in the middle of first.

2, a kind of heavy-duty car supercharged diesel engine exhaust silencer according to claim 1, it is characterized in that: the inner of intake noise reduction pipe (1) is fixed on the vertical dividing plate (7), the inner of exhausting silencer pipe (2) is fixed on the lateral partitions (6), one end opening of the first middle hush tube (8) also passes vertical dividing plate (7) and stretches in the I chamber, the other end sealing also is fixed on the rear end cover (4), one end opening of the second middle hush tube (9) also passes lateral partitions (6) and stretches in the II chamber, and the other end sealing also is fixed on the housing (5).

3, a kind of heavy-duty car supercharged diesel engine exhaust silencer according to claim 1 and 2, it is characterized in that: inboard and housing (5) inwall at the forward and backward end cap of silencing apparatus (3,4) are lined with sound-absorbing material (11) and guard shield (12), and guard shield (12) is gone up distribute porose (12a).

4, a kind of heavy-duty car supercharged diesel engine exhaust silencer according to claim 1 and 2, it is characterized in that: the cross section of the silencing apparatus ellipse that is as the criterion, the oval external frame of this standard is made up of the camber line of two straight lines, four fillets and two evaginations, hush tube (8) and silencing apparatus axis parallel in the middle of the intake noise reduction pipe (1) and first, hush tube (9) is vertical with the silencing apparatus shaft axis in the middle of the exhausting silencer pipe (2) and second.

5, a kind of heavy-duty car supercharged diesel engine exhaust silencer according to claim 3, it is characterized in that: the cross section of the silencing apparatus ellipse that is as the criterion, the oval external frame of this standard is made up of the camber line of two straight lines, four fillets and two evaginations, hush tube (8) and silencing apparatus axis parallel in the middle of the intake noise reduction pipe (1) and first, hush tube (9) is vertical with the silencing apparatus shaft axis in the middle of the exhausting silencer pipe (2) and second.