CN2605386Y

CN2605386Y - Exhaust silencer for internal combustion engine

Info

Publication number: CN2605386Y
Application number: CN 02251625
Authority: CN
Inventors: 林辉江
Original assignee: 张水成
Priority date: 2002-08-12
Filing date: 2002-08-12
Publication date: 2004-03-03
Anticipated expiration: 2012-08-12

Abstract

The utility model relates to a device to reduce the exhaust noise in the internal combustion engine. The exhaust pipe of the internal combustion engine adopts the optimization technology to change the sectional area of the air stream circulation, that is, to set a little traverse and a longitudinal metal pipe in the inner cavity of the exhaust pipe with a plurality of holes and are fixed in the interrelated outer wall of the exhaust pipe; therefore, the high speed pulsing air flowing into the exhaust pipe is changed into the low speed steady air stream. The utility model has the advantage of novel structure, little resistance for exhausting and low Power Consumption rate.

Description

Novel exhaust silencing apparatus on the internal-combustion engine

Affiliated technical field

The utility model relates to a kind of device of internal-combustion engine in the mechanical industry, especially is a kind of air exhaust muffler device that reduces engine noise.

Background technique

At present, both at home and abroad the silencing apparatus theory on internal-combustion engine is that one dimension (line) is static basically, though be applied to the exhaust silencer aspect two dimension (plane) or three-dimensional (solid) is arranged, and also is the various formula that derive under the stable prerequisite of air-flow low speed.Theoretical calculation and Practical Calculation error are big, and especially the error in high-frequency range is bigger.

Noise elimination that it is generally acknowledged its silencing apparatus mainly is that intermediate frequency is eliminated the noise.In fact, in the dry sound of the exhaust of internal-combustion engine, low frequency, intermediate frequency, high frequency all exist, and designing its silencing apparatus should be the full range silencing apparatus.The exhaust of internal-combustion engine, the pulse pneumatic that is high temperature and high speed is not stable air-flow, more is not the steady air flow less than 20m/s (meter per second clock).When the exhaust valve of internal-combustion engine had just been opened, exhaust velocity was up to 600-700m/s, and the high-frequency noise that this high speed pulse pneumatic produces weakens or prolongs and makes the silencing apparatus inefficacy.

The purpose of this utility model is to overcome the deficiency in the above prior art, and provide a kind of in the outlet pipe of internal-combustion engine: adopt the sectional area optimisation technique that becomes airflow, the high speed pulse pneumatic is become the low speed steady air flow, reach the purpose that reduces noise and save fuel oil.

Summary of the invention

Formation of the present utility model:

The outlet pipe of existing internal-combustion engine, different cross section for hollow, difform exhaust pipe, and exhaust pipe of the present utility model adopts change airflow section optimal technology, promptly be provided with vertical little metal tube in the inner chamber of outlet pipe, little metal tube is provided with some apertures, little metal tube by and be fixed on its lateral partitions, outlet pipe is provided with the little metal tube of air inlet and exhaust, and the little metal tube of inlet and outlet is fixed on the associated outer wall of internal-combustion engine vent-pipe.

Description of drawings

Embodiment during the utility model is incited somebody to action in conjunction with the accompanying drawings further specifies:

Fig. 1 is the main TV structure sketch of the novel exhaust silencing apparatus on the internal-combustion engine,

Fig. 2 is the side-looking A--A cross-section structure sketch of the novel exhaust silencing apparatus on the internal-combustion engine,

The sequence number at zero in the diagram, parts and position thereof:

1, the tube wall of silencing apparatus, 2, expansion chamber, 3, the housing of silencing apparatus, 4, the dividing plate of silencing apparatus, 5, expansion chamber, 6, hush tube, 7, the dividing plate of silencing apparatus, 8, expansion chamber, 9, the dividing plate of silencing apparatus, 10, expansion chamber, 11, hush tube, 11 ', relief opening, 12, hush tube, 13, hush tube, 13 ', the suction port of silencing apparatus, 14, the little hush tube (totally 6) between the dividing plate of silencing apparatus.A--A is the section of Fig. 1.

Embodiment

Illustrate: the waste gas that internal-combustion engine is discharged passes through 2,5,8,10 expansion chambers and

hush tube

13,6,12,14,11 by suction port 13 ' enter hush tube 13 suppressor case 3 in, the high speed pulse pneumatic is become low speed than steady air flow; Silencing apparatus dividing plate 4,7,9 can be divided into multi-cavity structure with silencing apparatus, makes pneumatic noise that phase difference be arranged; By the air-flow frequency conversion and make it and acoustic streaming breaks away from, via the relief opening 11 on the exhausting silencer pipe 11 on the silencing apparatus ' discharge.

Novel exhaust silencing apparatus on this internal-combustion engine, mainly by the external casing 3 of exhaust silencer and suction port 13 ', relief opening 11 ' constitute.In the inner chamber of the exhaust silencer on this internal-combustion engine mainly by: contain suction port 13 ' vertical hush tube 13 and the equidirectional

parallel hush tube

6,12,14,11 of plug-in type and

expansion chamber

2,5,8,10, dividing plate 4,7,9 and left and right tube wall 1 constitute, tube wall 1 with housing 3 seam be in the same place.The suction port 13 of exhaust silencer ' be one, relief opening 11 ' be one.Hush tube 13,11 on same center line,

hush tube

6,13,12,11, center line be positioned on the same cross section.

In the said A--A section, 6 little ventilation hush tubes 14 in

hush tube

6,13,12 and the dividing plate are parallel to each other and communicate; These several hush tubes and hush tube 11 in the dividing plate also communicate.

Still have some little vents on each little tube wall of said 6 little hush tubes 14.

The cross section of the housing 3 of said exhaust silencer is an ellipse.

Air flow rate can be in the 30-60m/s scope in the novel exhaust silencing apparatus on this internal-combustion engine, its silencing apparatus.

Good effect of the present utility model:

Exhausting silencing device on this internal combustion engine has adopted change airflow sectional area optimization technology, The high speed pulse pneumatic is become the low-speed stable air-flow; Make air-flow produce noise the phase difference technology of cancelling out each other is arranged; Converter technique and make the technology such as air-flow and acoustic streaming disengaging. This change airflow sectional area technology, structure is new Grain husk, it is big to have a sound deadening capacity, reduces noise, capable of saving fuel oil, and exhaust resistance is little, exhaust back pressure is low, power Loss is than little advantage.

Claims

1, the novel exhaust silencing apparatus on a kind of internal-combustion engine mainly is made of the external casing [3] of exhaust silencer and suction port [13 '], relief opening [11 '], it is characterized in that in the inner chamber of the exhaust silencer on this internal-combustion engine, by; The vertical hush tube [13] and the equidirectional parallel hush tube of plug-in type [6] that contain suction port [13 '], [12], [14, ] [11] and expansion chamber [2], [5], [8], [10]] dividing plate [4], [7], [9] and a left side, right tube wall [1] constitutes, tube wall [1] and housing [3] seam are together, the suction port of exhaust silencer [13 '] is one, relief opening [11 '] is one, hush tube [13], [11] on same center line, hush tube [6], [13], [12], [11] center line is positioned on the same cross section

2, novel exhaust silencing apparatus according to claim 1 is characterized in that in the said A--A section, and 6 little ventilation hush tubes [14] in hush tube [6], [13], [12] and the dividing plate are parallel to each other and communicate; These several hush tubes and hush tube [11] in the dividing plate also communicate,

3, according to claim 1,2 described novel exhaust silencing apparatuss, it is characterized in that still having some little vents on each little tube walls of said 6 little hush tubes [14],

4, novel exhaust silencing apparatus according to claim 1, the cross section that it is characterized in that the housing [3] of said exhaust silencer is an ellipse.