CN87205539U - Petroleum-saving, fire-preventing, exhaust-purifying automobile muffler - Google Patents

Abstract

The utility model discloses a petroleum-saving, fire-preventing, exhaust-purifying automobile muffler which is used for governing the automobile exhaust. The utility model is characterized in that a center tube with the same axial line with the air inlet pipe is arranged at the center of the catalysts in which an air inlet pipe is connected. In addition, a micro perforated plate can be arranged at the place between an inner cylinder filled with many layers of catalysts and an external cylinder and near the inner cylinder. Also, an air layer can be designed between the inner cylinder and the external cylinder, and the exhaust is expelled from both sides. The structure composition has the petroleum-saving, fire-preventing, exhaust-purifying functions, not only can make the most of the preheating of the catalytic reaction, but also can prevent the catalysts overheating and burning out.

Description

Petroleum-saving, fire-preventing, exhaust-purifying automobile muffler

Automobile fuel saving, back-fire relief, exhaust purging muffler are used for exhausted gases purification.

General automobile exhaust gas purifying silencing apparatus by suction tude, in inner core that segmentation placed and left the alloy honeycomb catalyst in space is housed, forms with the urceolus and the tail pipe of inner core coaxial line, that its detailed structure is asked for an interview is that on July 30th, 1986 was announced, application number is 85202176 Chinese utility model patent " two cylinder type automobile exhaust gas purifying silencing apparatus ".In this structure, by the waste gas sent off from automobiles that catalysis is heated, can be by dividing the catalysis silencer element of four sections placements, the Returning reactor inlet, the gas that enters reactor risen give heat effect, in flow process, also improved the temperature of catalyst layer simultaneously, thereby improved catalyticing purifying effect.When outwards discharging,, just can utilize the waste heat of exhaust that catalyst layer is incubated, thereby save thermal insulating material, also reduce cost owing to formed a cavity between the inside and outside tube.The shortcoming of this structure is, when the automobile blowdown was too much, catalytic reaction heat also correspondingly increased greatly, if when the temperature of the gas of catalysis heating back discharging surpasses 1100 ℃, will burn catalyzer.The utility model then can overcome this shortcoming, it is characterized in that: a center tube coaxial with it, that link with suction tude is arranged in the centre of multi-layer catalyst, its length is a bit larger tham the axial overall dimensions of multi-layer catalyst, and it has risen inlet stream (waste gas of motor vehicle emission) and has given heat effect.In addition, between inside and outside tube, near also microperforated panel being housed in the inner core place.BPU2.3 automobile fuel saving shown in Fig. 1～2, back-fire relief, exhaust purging muffler have just adopted this structure.Air-flow is after suction tude enters center tube, turn back through the inner core domed bottom again, cross four when air communication and be purified and emit catalytic reaction heat when disperse placing and leaving the multi-layer catalyst in gap, the wall temperature that it has improved center tube has risen airflow flowing in the center tube and has given heat effect.Then flowed out by the high-temp waste gas after the catalysis, discharge through tail pipe from the both sides conduit between microperforated panel and the urceolus.The characteristics of its air-flow trend are: it is streamlined distribution earlier on the hemisphere face, goes so that air-flow can be assigned in the through hole of each layer catalyzer equably.Because every layer of only thick 20～25mm of catalyzer when air-flow successively passes through, can utilize micropore to enlarge the principle of eliminating the noise and reduce pneumatic noise.Can adjust according to noise spectrum as for the gap between each catalyst layer, generally have 10,15,20,50, class such as 70mm.The domed bottom of inner core and the cavity between catalyst layer are equivalent to a noise elimination cavity, the long duct of the left and right sides then can reduce low-frequency noise between the inside and outside tube, especially be positioned at the conduit inboard, thickness is the microperforated panel of 0.8mm, by having the aperture that percent opening is 1.0～3.5% φ 0.8 thereon, can absorb partly sound wave, also play the noise elimination effect.The more important thing is: between microperforated panel and inner tank theca, leave the space, it separates high-temp waste gas and the inner core that catalyzer is housed, thereby eliminated the possibility that catalyzer is burnt out by high-temp waste gas, can not produce flame even the inflammable matter in exhaust when the catalyst coating, is also only seen rubescent and blaze up.Here, multi-layer catalyst plays a multilayer flame trap.Fig. 3～4 item are BPU5.5 automobile fuel saving, back-fire relief, exhaust purging muffler, it is not with microperforated panel, but an air layer is arranged around inner core, it both can separate high-temp waste gas and the inner core that catalyzer is housed, to guarantee that catalyzer can be not overheated, inner core is not directly contacted with ambient air, play insulation effect.

Embodiment:

One, BPU2.3 automobile fuel saving, back-fire relief, exhaust purging muffler.

The longitudinal section of this device of Fig. 1.

1 suction tude; 2 urceolus;

3 microperforated panels; 4 multi-layer catalysts;

5 inner cores; 6 tail pipes;

7 center tubes; 8 inlet stream; 9 blast airs.

The cross section of this device of Fig. 2.

That catalyzer is used is ABO ₃Type alloy honeycomb catalyst, carrier are Aludiromes, center tube and the inner core stainless steel of 0.8mm, the shell thick A of 1mm ₃Steel plate.It is applicable to that engine cylinder volume is 2.3 liters a gasoline car, as 212,121, and 130 cars etc.Adorned six chassis 1 day～June 4 June in 1987 in Beijing, its test result sees Table one.

Two, BPU5.5 automobile fuel saving, back-fire relief, exhaust purging muffler

The longitudinal section of this device of Fig. 3.

10 front covers; 11 ear tubes; 12 rear end covers;

13 plate washers; 14 ring plates.

The cross section of this device of Fig. 4.

Its material and BPU2.3 are together.It is applicable to that engine cylinder volume is 5.5 liters a gasoline car, as liberation car, east wind 140 cars etc.Its test result sees Table two in by the end of May, 1987 five of Beijing entruckings.

Three, back-fire relief experiment:

Test unit: Shanghai Inst. of Car and Tractor

Date of test: on March 31st, 1987

Experimental subjects: BPU2.3 automobile fuel saving, back-fire relief, exhaust purging muffler.Under the situation of 50Km/h when 30 ℃ of ambient temperatures, engine operating condition are the simulated roadway experiment, a gasoline tube is put at about 1.5 meters in the relief opening front lower place, interior dress gasoline 120mL, and the gasoline volatilization area is 11310mm ², allowing motor operation 5 minutes, this moment, the exhaust outlet temperature was 620 ℃, did not find the gasoline phenomenon of catching fire in the experimentation all the time.

Claims (3)

1, a kind of automobile fuel saving, back-fire relief, exhaust purging muffler are used for automobile exhaust gas improvement, general automobile exhaust gas purifying silencing apparatus by suction tude, in inner core that segmentation placed and left the alloy honeycomb catalyst in space be housed, form with the urceolus and the tail pipe of inner core coaxial line, of the present utility model being characterised in that, have in the centre of multi-layer catalyst one with its center tube coaxial, that link to each other with suction tude, its length is a bit larger tham the axial overall dimensions of multi-layer catalyst; There is air buffer the outside of catalyzer tube.There is exhaust steam passage the interlayer outside in the left and right sides.

2, automobile fuel saving according to claim 1, back-fire relief, exhaust purging muffler is characterized in that, between inside and outside tube, near microperforated panel being housed the inner core place.

3, automobile fuel saving according to claim 1, back-fire relief, exhaust purging muffler, the flow area that it is characterized in that left and right sides exhaust steam passage are 2.5～3.0 times of center tube flow area.

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