CN86209754U - Damped muffler for automobile - Google Patents

Abstract

The utility model discloses a damped muffler for light cars, comprising a perforated pipe, a perforated plate, and four expansion chambers. After entering into the muffler, air flow goes through multistage expansion and self interference by damping so that favorable erasing effect is achieved; meanwhile, the power performance of the entire car is ensured. The utility model has the effects of simple structure, fuel saving, etc.

Description

Damped muffler for automobile

The utility model belongs to motor car engine airflow noise-elimination device or venting gas appliance.Be specially adapted to use the automobile exhaust noise reduction of 492-Q h type engine h (four cylinders, diameter 92mm, stroke 92mm petrol engine).

Existing domestic production with supporting resistance automobile exhaust or the silencer of above-mentioned motor, all adopt hole pipe, resonant cavity and expansion chamber structure, can reach certain erasure effect, but perforated pipe and expansion chamber design are unreasonable, the shortcoming of erasure effect difference.

The purpose of this utility model is the above-mentioned shortcoming that overcomes in the prior art, designs a kind of automobile silencer of simple in structure, reasonable in design, good muffling effect.

The automobile resistant noise-reducing device of the utility model design utilizes the abrupt interface of pipeline, and impedance mismatching is interfered acoustic reflection, adopts the technology of perforated plate, makes and is decayed along the sound wave of pipe transmmision, thereby reach the effect of noise reduction.

Specific design scheme of the present utility model is: the metal circular tube that has aperture and intermediate isolating above sound wave enters with air-flow, four expansion chambers are housed above pipe, the sheetmetal of twice perforation is housed between expansion chamber, and making it has higher erasure effect in wide frequency range.

Compare with prior art, resistance mobile muffler of the present utility model, simple in structure, reasonable in design, good muffling effect (can reach below 81.3 decibels).

Description of drawings:

Fig. 1 is resistance mobile muffler structure (Fig. 1 is the specification digest accompanying drawing)

Fig. 2 is the resistance mobile muffler first expansion chamber sectional view

Fig. 3 is resistance mobile muffler the 3rd an expansion chamber sectional view

1---suction port 2---perforated pipe 3---first expansion chamber

4---perforated plate 5---second expansion chamber 6---perforated pipes

7---perforated pipe 8---the 3rd expansion chamber 9---the 4th expansion chambers

10---perforated plate 11---outlet pipe 12---perforated pipe dividing plates

In conjunction with the accompanying drawings, embodiment of the present utility model is described:

The utility model is by cylinder blanket, porous suction tude (1), and atresia outlet pipe (11), perforated plate (4), non-porous separator plate and termination are formed.Dividing plate is cased successively, and suction tude (1) and outlet pipe (11) are contained in the circular hole of dividing plate, and its relative position such as Fig. 3 show.A metal spacer block (12) is housed in the suction tude (1), and porous barrier (4) is contained in the non-porous separator plate both sides, and forms four expansion chambers (3), (5), (8), (9) with end cap.Suction tude is inserted into the 4th expansion chamber (9) from an end of first expansion chamber (3), and outlet pipe (11) is connected near on the porous barrier of the 4th expansion chamber.

Sound wave enters baffler with air-flow by suction port (1), entering first expansion chamber (3) by perforated pipe (2) expands, the aperture that passes through again above the perforated plate (4) enters second expansion chamber (5), pass through perforated pipe (6) again, (7) enter the 3rd expansion chamber (8) and the 4th expansion chamber (9), main flow to the four expansion chambers (9) pass through perforated plate (10) afterwards and get back to the 3rd expansion chamber (8) expansion, and with enter the sound wave interference of the 4th expansion chamber (9) through perforated pipe (7), last air-flow is by outlet pipe (11) exhaust silencer, the sound wave air-flow in baffler through overdamping, self interferes mutually, reaches best erasure effect.

The main designing technique parameter of resistance mobile muffler of the present utility model is:

The length divergence ratio

First expansion chamber, 200～210mm 6～8

Second expansion chamber, 160～170mm 14～16

The 3rd expansion chamber 60～70mm 15～17

The 4th expansion chamber 110～120mm 9～11

The perforated plate aperture is 3～8mm

Damped muffler for automobile of the present utility model, the power loss of tests ratio is not more than 5%; The insertion loss value is not less than 22 decibels.

Claims (3)

1, a kind of resistance mobile muffler, it is made up of cylindrical outer cover, porous suction tude, atresia outlet pipe, porous barrier, non-porous separator plate and end cap, dividing plate is cased successively, air inlet-outlet pipe is contained in the circular hole of dividing plate, it is characterized in that dividing between the sector hole in the described suction tude metal spacer block is housed, described porous barrier is contained in the non-porous separator plate both sides and forms four expansion chambers with end cap, suction tude is inserted into the 4th expansion chamber from an end of first expansion chamber, and outlet pipe is connected near on the porous barrier of the 4th expansion tube.

2, according to the baffler of claim 1, it is characterized in that the length range of described expansion chamber is respectively, first Room is 200～210mm, and second Room is 160～170mm, and the 3rd Room is 60～70mm, and fourth ventricle is 110～120mm.

3, according to the baffler of claim 1, it is characterized in that described perforation dividing plate, pore diameter range is 3～8mm.