CN2816366Y

CN2816366Y - IC engine exhausting silencer

Info

Publication number: CN2816366Y
Application number: CN 200520009753
Authority: CN
Inventors: 林辉江
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-09
Filing date: 2005-08-09
Publication date: 2006-09-13
Anticipated expiration: 2015-08-09

Abstract

The utility model relates to an IC engine exhausting silencer of large insertion loss, which is characterized in that partition boards (2, 5, 6) divides the inner part of the silencer into four chambers (a first, a second, a third and a fourth), wherein the volume of the first chamber is larger than that of the third chamber, the volume of the third chamber is larger than that of the second chamber, and the volume of the second chamber is larger than that of the fourth chamber; the air inlet silencing pipe (7) and intermediate silencing pipes (10, 11) are of the same pipe structure of which one end is provided with an opening, and the other end is closed; the pipe wall of each of the silencing pipes is distributed with small holes (12); both ends of a ventilating pipe (3) are provided with openings, and both ends of an exhaust pipe (9) are provided with openings; one end of the exhaust pipe (9) extends outside an end cover, and the other end passing through the first and the second chambers extend into the third chamber; the ventilating pipe (3) communicates the second and the third chambers. The utility model which is suitable for automobiles has the advantages of large insertion loss (silencing quantity) and small power loss ratio. The utility model not only can meet the requirements of relevant noise standards of China, but also can meet the requirements of an automobile manufacturer to the installation positions and methods.

Description

Insert the big exhaust silencer for internal-combustion engine of loss

One, technical field:

The utility model relates to silencing apparatus, especially a kind of big exhaust silencer for internal-combustion engine of loss that inserts.

Two, background technique:

At present, the sectional area of the exhaust silencer for internal-combustion engine of using on the automobile passenger vehicle, general circle, flat, the ellipse of adopting, but its suction tude and discharge tube all are the shaft axiss along silencing apparatus, from an end (or a side) air inlet, from the other end (or opposite side) exhaust, and less from same end face air inlet and exhaust.Fig. 1 is the conventional construction from same end face turnover.Among Fig. 1,1 and 5 is end caps, the 2nd, and housing, the 3rd, sound-absorbing material, the 4th, have the breathing pipe of many apertures on the tube wall, Fig. 2 is the A-A sectional view of Fig. 1.Traditional exhaust silencer for internal-combustion engine is to reduce noise by sound-absorbing material 3 sound absorptions that are filled between silencing apparatus and the breathing pipe, thereby inserts loss (sound deadening capacity) not quite, generally has only tens decibels, does not satisfy the requirement of the relevant noise level limit of present country.

Three, content of the present utility model:

It is big that the purpose of this utility model provides a kind of insertion loss (sound deadening capacity), can satisfy the exhaust silencer for internal-combustion engine that the relevant noise level limit of country requires.

For achieving the above object, the purpose of this utility model is: design a kind of big exhaust silencer for internal-combustion engine of loss that inserts, comprise end cap, shell, dividing plate, hush tube, breathing pipe and outlet pipe, its key is: dividing plate is separated into 4 chambers with silencing apparatus inside, wherein the I cavity volume is greater than the III chamber, the III chamber is greater than the II chamber, and the II chamber is greater than the IV chamber; Intake noise reduction pipe and middle hush tube are an end opening, the tubular construction of end sealing, and on tube wall, be distributed with aperture; The opening end of intake noise reduction pipe stretches out outside the end cap, and closed end is fixed on the dividing plate between I, the II chamber, and middle hush tube closed end all is fixed on the dividing plate between II, the III chamber, and its opening end stretches into I chamber or IV chamber respectively; Breathing pipe and outlet pipe two ends are opening all, and wherein outlet pipe one end stretches out outside the end cap, and the other end passes I, the II chamber stretches in the III chamber, and breathing pipe is communicated with II, IV chamber.

The gross area of aperture is greater than the sectional area of this hush tube on the described hush tube.

Described by the air current flow direction, the aperture gross area of being opened on the hush tube of front is greater than the gross area of the aperture of opening on the hush tube of back.

The total sectional area of the middle hush tube in the described same radial cross section is greater than the sectional area of intake noise reduction pipe or outlet pipe.

Above-mentioned all hush tubes, tracheae and outlet pipe all have the support fixation more than 2, the shaft axis of every pipe all with the axis parallel of shell.

Adopt the beneficial effect of such scheme to be: insert loss (sound deadening capacity) greatly, power loss ratio is little, and it can satisfy the requirement of the relevant noise standard of country, also can satisfy the requirement of auto vendor to mounting point and method.

Below in conjunction with accompanying drawing the utility model is further described.

Four, description of drawings:

Fig. 1 is the structural representation of traditional combustion engine exhaust silencer.

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

Fig. 3 is a structural representation of the present utility model.

Fig. 4 is the right elevation of Fig. 3.

Fig. 5 is the A-A sectional view of Fig. 3.

Five, embodiment:

Please see Figure 3, Fig. 4, the utility model mainly is made up of left end cap 1, dividing plate 2, breathing pipe 3, shell 4, dividing plate 5, dividing plate 6, intake noise reduction pipe 7, right end cap 8, outlet pipe 9, middle hush tube 10, middle hush tube 11, its central diaphragm (2,5,6) is separated into 4 chambers (I, II, III, IV) with silencing apparatus inside, wherein the I cavity volume is greater than the III chamber, the III chamber is greater than the II chamber, and the II chamber is greater than the IV chamber; Intake noise reduction pipe 7 and

middle hush tube

10,11 are an end opening, the tubular construction of end sealing, and on tube wall, be distributed with aperture 12; The opening end of intake noise reduction pipe 7 stretches out outside the end cap, and closed end is fixed on the dividing plate 6 between I, the II chamber, and

middle hush tube

10,11 closed ends all are fixed on the dividing plate 5 between II, the III chamber, and its opening end stretches into I chamber or IV chamber respectively; Breathing pipe 3 and outlet pipe 9 two ends are opening all, and wherein outlet pipe 9 one ends stretch out outside the end cap, and the other end passes I, the II chamber stretches in the III chamber, and breathing pipe 3 is communicated with II, IV chamber.

Described hush tube (7,10,11) is gone up the sectional area of the gross area of aperture 12 greater than this hush tube.

This silencing apparatus is by the air current flow direction, and the aperture gross area of being opened on the hush tube of front is greater than the gross area of the aperture of opening on the hush tube of back.

In conjunction with Fig. 3, shown in Figure 5: middle hush tube 10 in the same radial cross section or 11 total sectional area are greater than the sectional area of intake noise reduction pipe 7 or outlet pipe 9.

All hush tubes (7,10,11), breathing pipe 3 and outlet pipe 9 all have the support fixation more than 2, the shaft axis of every pipe all with the axis parallel of shell 4.

Working principle of the present utility model is: after high temperature, high speed pulse pneumatic pipe before silencing apparatus that motor is discharged entered the intake noise reduction pipe 7 of silencing apparatus, buffering was expanded in aperture 12 ejections from the tube wall in the I chamber.Then by front end put in the

opening intervalve

10 and 10 of I chamber ' tube wall on aperture 12 spray in the II chamber expand, buffering; Enter in the IV chamber by breathing pipe 3 steering flows again and expand, cushion; Spray in the III chamber by the aperture of the middle hush tube 11 that puts in the IV chamber again and expand, discharge by breathing pipe 9 at last and enter in the atmosphere.Because intake noise reduction pipe 7, middle hush tube, each chamber of breathing pipe 3 and discharge tube 9 and silencing apparatus constitutes connects and the part parallel-connection structure, under the throttling action of aperture on each hush tube and the pipe, under the gas storage storage pressure effect of each chamber, the high speed pulse pneumatic that enters silencing apparatus is transformed into more stable low speed flow, reduces noise; Owing to adopt micropore jet, a big strand air-flow is dispersed into hundreds of thigh little airflow, air-flow harmony wave current is subjected to the rubbing action of aperture, and noise reduces; Owing to adopt micropore jet, the shift frequency effect is arranged, reduce noise; Because the sound wave of each aperture ejection has phase difference, crest and trough can be offset a part, reduce noise; Because each hush tube all can make the direction of air-flow and sound wave stream change 90 °, so change 90 ° of airflow directions * 8=720 ° in the silencing apparatus altogether, part air-flow and sound wave flow point is opened, the damping coefficient of sound wave is increased, reduce noise.

Claims

1. one kind is inserted the big exhaust silencer for internal-combustion engine of loss, comprise end cap (1,8), shell (4), dividing plate (2,5,6), hush tube (7,10,11), breathing pipe (3) and outlet pipe (9), it is characterized in that: dividing plate (2,5,6) is separated into 4 chambers (I, II, III, IV) with silencing apparatus inside, wherein the I cavity volume is greater than the III chamber, the III chamber is greater than the II chamber, and the II chamber is greater than the IV chamber; Intake noise reduction pipe (7) and middle hush tube (10,11) are an end opening, the tubular construction of end sealing, and on tube wall, be distributed with aperture (12); The opening end of intake noise reduction pipe (7) stretches out outside the end cap, closed end is fixed on the dividing plate (6) between I, the II chamber, middle hush tube (10,11) closed end all is fixed on the dividing plate (5) between II, the III chamber, and its opening end stretches into I chamber or IV chamber respectively; Breathing pipe (3) and outlet pipe (9) two ends are opening all, and wherein outlet pipe (9) one ends stretch out outside the end cap, and the other end passes I, the II chamber stretches in the III chamber, and breathing pipe (3) is communicated with II, IV chamber.

2. the big exhaust silencer for internal-combustion engine of insertion loss according to claim 1, it is characterized in that: hush tube (7,10,11) is gone up the sectional area of the gross area of aperture (12) greater than this hush tube.

3. the big exhaust silencer for internal-combustion engine of insertion loss according to claim 1 and 2, it is characterized in that: by the air current flow direction, the aperture gross area of being opened on the hush tube of front is greater than the gross area of the aperture of opening on the hush tube of back.

4. the big exhaust silencer for internal-combustion engine of insertion loss according to claim 3, it is characterized in that: the total sectional area of the middle hush tube (10 or 11) in the same radial cross section is greater than the sectional area of intake noise reduction pipe (7) or outlet pipe (9).

5. the big exhaust silencer for internal-combustion engine of insertion loss according to claim 1 and 2, it is characterized in that: all hush tubes (7,10,11), breathing pipe (3) and outlet pipe (9) all have the support fixation more than 2, the shaft axis of every pipe all with the axis parallel of shell (4).