CN86202876U

CN86202876U - Exhaust purification muffler for automobile

Info

Publication number: CN86202876U
Application number: CN198686202876U
Authority: CN
Inventors: 姜鹏明; 耿晓音; 战家恺
Original assignee: Beijing Municipal Institute of Labour Protection
Current assignee: Beijing Municipal Institute of Labour Protection
Priority date: 1986-05-13
Filing date: 1986-05-13
Publication date: 1987-04-29

Abstract

The utility model discloses a purifying and sound-muffling device for an automobile, which relates to an exhaust purification muffler for automotive engines or other internal-combustion engines. The impedance combined integrated purification muffler of the device is designed by utilizing catalytic purifying and the impedance combined broad band muffling principle, and has the advantages of high purification efficiency, notable muffling effect, saving fuel and saving labor.

Description

Exhaust purification muffler for automobile

The utility model is about the engine exhaust purifying muffler, particularly the automobile exhaust gas purifying silencing apparatus.

The seriousness of the environmental pollution that the exhaust of motor and exhaust sound are caused is well-known.Control to the external purification and the exhaust sound of automobile exhaust, normally adopt independent of each other minute body structure of purifier and silencing apparatus, this minute body structure not only causes the increase of engine power loss and oil consumption, also can increase installation fee and cost of production, to being difficult to apply in transformation with car.The inventor participates in designing, application number is two cylinder type automobile exhaust gas purifying silencing apparatuss of 85202176 " utility application; be to utilize simple expansion cavity resistance principle to reach the noise elimination purpose; exhaust enters through water conservancy diversion Taper Pipe, dedusting piece and catalyzer from the silencing apparatus inlet and turn to 180 ° of outflows in inner core, turns to 180 ° to be discharged in the atmosphere again.This purifying muffler because central gas stream moves towards to turn too much, causes exhaust not smooth, causes the air-flow regenerated noise easily, and the exhaust sound tone color worsens because of radio-frequency component increases, and burns inner member simultaneously easily because of the purifier inside temperature is too high.

It is effective that the purpose of this utility model provides a kind of purification noise elimination, and can reduce the whole purifying muffler of the impedance composite of motor power consumption and oil consumption.

The utility model is the improvement to above-mentioned existing pair of cylinder type automobile exhaust gas purifying silencing apparatus, be included in the cylinder blanket cylindrical shell have perforation on the wall with the configuration of casing cylinder coaxial line and separate a distance before, pipe in the back, dispose umbrella shape perforation assembly parts in preceding between pipe front-end face and the conic diffuse ear end face, in the pipe several catalyzer purifying part that separate each other are housed in preceding, pipe rearward end and corresponding casing cylinder position are set with ring-type catalyzer purifying part in preceding, and the pipe ear end face is provided with an internal partition in preceding, the front portion is equipped with a contraction earlier in the pipe in the back, the convergent-divergent pipe that straight transitions is then expanded, the straight transitions section of convergent-divergent pipe and its afterbody dispose the catalyzer purifying part, the site of perforation that has the interior pipe in back disposes an internal partition and is set with ring-type catalyzer purifying part at the outer surface and the corresponding casing cylinder position at its this position, at the back outer wall of inner tube of corresponding convergent-divergent pipe straight transitions section to the noise elimination member of making of microperforated panel is housed between the casing cylinder, the outer wall of inner tube of microperforated panel noise elimination member back between the casing cylinder and before in the outer wall of pipe front portion between the casing cylinder external partition is housed, and at outer wall of inner tube to a plurality of chambeies of formation between the casing cylinder.

Umbrella shape described in the utility model perforation assembly parts is equipped with in being at least by two and is stamped to form and has the umbrella shape part in hole that staggers mutually with microperforated panel, with the top truncation of the umbrella shape part on top and be fixed on the inwall of sleeve pipe, the thickness δ of its microperforated panel is 0.6～1.2mm, micro-pore diameter φ is 0.6～0.8mm, punching rate is 3～5%, when adopting two tri-angle-holed umbrella shape parts that have three 60 ° of angles of staggering mutually, the axial distance of umbrella shape part is 5～50mm.

Catalyzer purifying part described in the utility model is to adopt ceramic catalyst or ABO ₃Outside alloy catalyst or pottery and ABO ₃Outside the alloy mixed catalyst make.

Convergent-divergent pipe described in the utility model, its expanding duct is 2～5 with the length ratio of straight transitions part, the diameter ratio is 1.3～2.

Microperforated panel noise elimination member described in the utility model is to be 0.5～1mm with thickness δ, and micro-pore diameter φ is 0.5～1mm, and punching rate is 1～5%, axially leaves the two layers of porous plates at least in 50～200mm space and makes, and forms different chamber between the member.When adopting double-deck ring-type microperforated panel noise elimination member, thickness of slab δ is 0.8mm, and micro-pore diameter φ is 0.8mm, and the first layer punching rate is 2.5%, and second layer punching rate is 1%.

Internal partition described in the utility model has aperture, and punching rate is 5～25%.

The automobile exhaust gas purifying silencing apparatus that the utility model provides, because blast air is good luck direction catalyzer purifying part outside the pipe in the catalyzer purifying part flow direction of interior pipe, avoided because of turning the big curved drag losses that causes, the even flow path catalyzer of blast air is beneficial to energy-conservation province merit, owing to adopted umbrella shape perforation assembly parts, the convergent-divergent pipe that has the straight transitions section, structures such as microperforated panel noise elimination member, not only help purifying, also realized sound absorption, resonance sound-absorbing, the combination that expanssion type is eliminated the noise, formed and do not used resistive material, the impedance complex wideband noise elimination structure of all metal construction.All thus, be directed at this purification silencer and had sound deadening capacity big (greater than 30dB(A), about 1000 times of sound energy attenuation), frequency of noise elimination wide (to very strong noise elimination effect is all arranged in the broad frequency range of 31.3～8KHZ, general engine noise peak value is between 63～500HZ), energy-conservation province merit, purification efficiency advantages of higher.According to GB3845～83, GB3842-83 and the world " exhaust silencer for internal-combustion engine test method; is Beijing 213 silencing apparatuss and the two gardens of GG85202176 cartridge type automobile exhaust gas purifying silencing apparatus with this purifying muffler and homemade 121,130, U.S.'s jeep; with a type of engine purify, technical orders such as noise elimination, power consumption, oil consumption test, data are as shown in table 1:

Of the present utility modelly will be illustrated in conjunction with following accompanying drawing with by an embodiment about characteristics.

Accompanying drawing 1---automobile exhaust gas purifying acoustic wave filter structure schematic representation.

Accompanying drawing 2-umbrella shape perforation assembling unit structure schematic representation

Embodiment:

Adopt that the silencing apparatus L/D ratio is 3.6, outer tube diameter is 1.6 with the diameter of inner pipe ratio; Alloy is 1.2 with ceramic mixed catalyst purifying part, its loading amount ratio; The angle of flare of conic diffuse and convergent-divergent pipe and angle of throat are 45 °; With 2 tri-angle-holed, axial distances that have three 60 ° of angles of staggering mutually is the umbrella shape perforation assembly parts (the top truncation on top) of 50mm; With expanding duct and flat segments length than being that 3:1, diameter are than the convergent-divergent pipe that is 2; With the purifying muffler that two double-deck ring-type microperforated panel noise elimination members constitute, structure as shown in Figure 1.Air-flow purifies the noise elimination process: air-flow from suction tude 1 through conic diffuse 2 again to umbrella shape perforation assembly parts 3(at this moment; air-flow passes from the hole that intermeshes; the similar labyrinth that entered; the umbrella shape part has been tackled unburned charcoal cigarette completely; guard catalyst is few contaminated; sound wave has experienced contraction-expansion-contraction again-expansion again in the umbrella shape part; variation has taken place in acoustic impedance; played certain noise elimination effect) enter the catalyzer purifying part 4 that grouping is put then; 5; the 6 interior in the past again hole groups 8 that manage 7 outer walls enter outer ring-like catalyzer purifying part 9(this moment; because the internal diameter of the inner tube diameter of catalyzer purifying part greater than suction tude 1 is housed; flow line speed descends; increased the time of contact of air-flow and catalyzer; the air-flow that carries catalytic reaction heat and waste heat plays preheating and insulation to the catalyzer of back; help the raising of purification efficiency) through the catalyzer purifying part 12 of the straight transitions section of convergent-divergent pipe 11 and afterbody and 13(because in the convergent-divergent pipe circulation area is shunk with expansion gradually; when reaching the noise elimination effect; also has good aeroperformance; produce eddy current hardly; promptly reduced resistance; also suppressed regenerated noise; because corresponding length different of continually varying divergence ratio every bit apart from throat's straight tube; thereby broadening frequency of noise elimination; because catalyzer purifying part 12; 13 distances are far away; according to aperture diffusion noise-cancelling theory; in catharsis, help eliminating the noise; purifying and noise elimination combines) the hole group 14 who enters pipe 26 outer walls in the back manages the hole group 17 of 26 outer walls in outer ring-like catalyzer purifying part 15 and back; enter catalyzer purifying part 18 and taper and shrink 19, discharge from tail pipe 20 at last.Because the hole group 14 on hole group 21 on ante-chamber 27 and the preceding inner tube wall and back cavity 29 and the back inner tube wall has constituted Hai Muhuo and has grown resonant cavity, can decay respectively a certain medium-high frequency band noise and be positioned at the peak-peak noise of low frequency, the rectilinear propagation of motor sound wave that internal partition 10 has hindered shelves, in before the airflow passes during pipe ring shape catalyzer purifying part 9, except that the sub-fraction reflected sound, most of noise has been attenuated in lumen 28, not only broadening noise elimination frequency band, and to the pulsation source of the gas and the pulsation sound source play rectified action, reduce exhaust sound, improved the tone color of exhaust sound.

This purification silencer is surveyed through sport car, it is that 93%HC purification conversion ratio is 75% that CO is purified conversion ratio, the outer maximum acceleration noise of car was 110dB(A originally), behind the dress purifying muffler is 79.5dB(A), the outer maximum acceleration noise reduction 30.5dB(A of car), reduce 8.5dB(A than adorning original silencing apparatus), through roadway experiment, fuel-economizing 6.3%, the highest speed ratio is adorned former silencing apparatus and is improved 1.6 kilometers/hour.Description of drawings:

Accompanying drawing 1-automobile exhaust gas purifying acoustic wave filter structure figure

1-suction tude 2-conic diffuse 3-is fixed on the umbrella shape perforation assembly parts 4 on the casing wall, 5,6,9,12,13,15, pipe 8 in before the 18-catalyzer purifying part 7-, 14,17,21-

hole group

10,16 internal partition 11-convergent-divergent pipe 19-conical converging 20-

tail pipes

22,25 external partitions 23, pipe 27-ante-chamber 28-lumen 29-back cavity 30-casing cylinder in behind the 24-microperforated panel noise elimination member 26-.

Annex 2-umbrella shape perforation assembling unit structure figure

31,32-umbrella shape part 33,34-triangle macropore 35-apical pore 36-sleeve pipe

Claims

1, a kind of automobile exhaust gas purifying silencing apparatus, by suction tude, conic diffuse, in be equipped with honeycomb catalyst interior pipe and with the cylindrical shell cylindrical shell of its coaxial line, collapsible tube and tail pipe are formed, feature of the present utility model is, interior pipe is by before axially spaced from each other, pipe is formed in the back, pipe front-end face and conic diffuse ear end face dispose umbrella shape perforation assembly parts in preceding, in the pipe several catalyzer purifying part that separate each other are housed in preceding, pipe rearward end and corresponding casing cylinder position are set with ring-type catalyzer purifying part in preceding, and the pipe ear end face is provided with an internal partition in preceding, the pipe front portion is equipped with a contraction earlier in the back, the convergent-divergent pipe that straight transitions is then expanded, the straight transitions section and the afterbody of convergent-divergent pipe dispose the catalyzer purifying part, the site of perforation that has the interior pipe in back disposes an internal partition and is set with ring-type catalyzer purifying part at the outer surface and the corresponding casing cylinder position at its this position, at the back outer wall of inner tube of corresponding convergent-divergent pipe straight transitions section to microperforated panel noise elimination member is housed between the casing cylinder, at the outer wall of inner tube of microperforated panel noise elimination member back to forming a plurality of chambeies between the casing cylinder.

2, purification silencer according to claim 1, it is characterized in that described umbrella shape perforation assembly parts is equipped with in being at least by two is stamped to form and has the umbrella shape part in hole that staggers mutually with microperforated panel, with the umbrella shape part top truncation on top and be fixed on the inwall of sleeve pipe.

3, purification silencer according to claim 1, the thickness δ that it is characterized in that the microperforated panel that described umbrella shape perforation assembly parts is used is 0.6～1.2mm, micro-pore diameter φ is that 0.6～0.8mm punching rate is 3～5%, have the tri-angle-holed of 60 ° of angles of staggering mutually on the umbrella shape part, the umbrella shape part top truncation on top also is fixed on the inwall of sleeve pipe, and the axial distance of umbrella shape part is 5～50mm.

4, purification silencer according to claim 1 is characterized in that described catalyzer purifying part is to adopt ceramic catalyst.

5, purification silencer according to claim 1 is characterized in that described catalyzer purifying part adopts except that ABO ₂Outside alloy catalyst.

6,, it is characterized in that described catalyzer purifying part adopts pottery and ABO according to claim 4 or 5 described purification silencer ₃Outside the alloy mixed catalyst.

7, according to the described purification silencer of claim 1, it is characterized in that described convergent-divergent pipe, the length ratio of its diffusing tube and straight transitions section is 2～5, and diameter ratio is 1.3～2.

8, purification silencer according to claim 1, it is characterized in that described microperforated panel noise elimination member is is 0.5～1mm with thickness δ, micro-pore diameter φ is that 0.5～1mm, punching rate are 1～5%, the two layers of porous plates at least that axially leaves 50～200 spaces is made.

9, purification silencer according to claim 1 is characterized in that described internal partition is installed with aperture, punching rate is 5～25%.