CN2076606U - Exhaust catalytic-purifier for internal combustion engine - Google Patents

Abstract

The utility model discloses an exhaust catalytic-purifier for internal combustion engine, comprising an upper shell, a lower shell, a pre-positioned catalytic bed, a main catalytic bed and a flow guiding cooling plate. The catalytic beds are arranged in the shells after being wrapped by inorganic heat-insulating materials. Because, an inorganic heat-insulating wrap is adopted, the catalytic beds and the shells does not need to be fixed tightly or added with seals. Therefore, the catalytic beds has the advantages of simple structure, low requirements of machining precision and easy assembly. The exhaust catalytic-purifier for internal combustion engine is provided with the flow guiding cooling plate to prevent combustible materials on ground from being ignited, and is provided with the pre-positioned catalytic bed for purifying to improve air flow distribution and prevent the main catalytic bed from being burnt out because of fuel injection during the irregular working of cars. Therefore, the purifying rate is increased and the service life of the exhaust catalytic-purifier for internal combustion engine is prolonged.

Description

Exhaust catalytic-purifier for internal combustion engine

The utility model is a kind of I. C. engine exhaust catalytic cleaner, particularly is applicable to the exhaust catalytic cleaner of motor car engine.

The CO of motor vehicle emission, HC, NOx and noise have constituted the main source of municipal pollution, and it is the important measures of eliminating exhaust pollution that automotive exharst gas catalytic converter is installed.Polytype car exhaust gas purifier was had description, as: US 4148860, and US 3441381, CN88207738, CN86202876, CN85202176, CN88206725 etc.Use ball shape catalyst in these purifiers or use honeycomb ceramic integral catalyzer, general processing and packaging technology more complicated, the shortcoming that cooperates the assembling aspect between honeycomb ceramic integral catalyzer and the purifier shell particularly, often make the anti-mechanical vibration of purifier, thermal shock aspect ability.With the design nearer like patent US 3441,381 and CN 86202876 are arranged, CN 88206725.Between ceramic honeycomb catalyst and housing, all adopt wire gaze or have the wire gaze parcel catalyzer block of catalytic performance.Generally only use a kind of catalyzer in the purifier.

It is a kind of simple for assembly process that the purpose of this utility model is to provide, and the catalyzer shock resistance is strong, and the new catalytic purifier of fire safety ability is arranged.

The utility model improves existing integral barrel formula purifier and purifying muffler, comprise housing as independent purifier, catalyzer and flow-guiding radiation plate are formed, housing is divided into upper and lower casing two-part, the catalyzer of packing in the housing comprises precatalyst and main body catalyzer two-part, precatalyst is seated in the gas inlet end of purifier, the main body catalyzer is positioned at thereafter, catalyzer after being packed into housing welds together upper and lower casing, and is welding the flow-guiding radiation plate on the lower shell body; As purifying muffler, its purifier part is identical with independent purifier, its silencing apparatus part is characterised in that by two resonant cavities, two micropunch pipes, two dividing plates and an expansion cavity are formed, and two dividing plates will be divided into two resonant cavities and an expansion cavity in the suppressor case, and expansion cavity is positioned in the middle of two resonant cavities, a micropunch pipe is installed on purifier relief opening and the dividing plate, and second micropunch pipe is installed between another dividing plate and silencing apparatus relief opening.Structure of the present utility model is provided by Fig. 1,2,3.

Fig. 1 is catalytic cleaner packet configuration figure.Among the figure: 2, upper shell; 3, precatalyst bed; 4, main body beds; 5, inorganic heat insulation covering; 6, lower shell body; 7, flow-guiding radiation plate.Upper and lower casing the 2, the 6th becomes two symmetrical housings, and two ends become cone, move forward and backward the annulus that has convex on inner walls for preventing beds, and the annulus number is fixed according to the bed number.Beds can be according to different its structure differences of selected catalyzer, when selecting for use ceramic honey comb to be the catalyzer of carrier, the shape of carrier is made the global shape similar to the purifier cavity, can closely contact with inner walls for making beds put into housing, wrap up at honeycomb ceramic carrier external application thermal insulation inorganic material.And when selecting ball shape catalyst for use, beds 3,4 is made cylindrical bed, makes cylindrical drum with sheet metal by shape in the purifier shell, and the post two ends add metallic sieve, add catalyzer in it, be wrapped in cylinder with thermal insulation inorganic material equally and be loaded in the housing outward.After adding beds in the upper and lower casing, upper and lower casing is welded into one, can be made into a chimb for ease of the welding upper and lower casing limit that contacts.The thermal insulation inorganic material of inorganic heat insulation covering 5 can be made by adding an amount of vermiculite and organic bond in sial or the aluminium chloride fiber.This material has adiabatic and plasticity is simplified catalyst layer filling process, and airtight performance is good.Have radiation hole on the flow-guiding radiation plate 7, the shape of Heat sink 7 is similar to the shape of lower shell body 6, covers on below the lower shell body 6, is fixed on the housing by spot welding, and flow-guiding radiation plate 7 can prevent effectively that ground fuel from being ignited.Above-mentioned upper and lower casing 2,6 and Heat sink 7 all can (0.5～1mm) impact briquetting be made by sheet metal.When with stamping technology system upper and lower casing, can on housing, stamp out dark 1～6mm, the groove of wide 4～20mm, outstanding position promptly can be the annulus of convex in housing, uses with the fixed catalyst bed.In addition, can adopt catalyzer of the same race in precatalyst bed and the main body beds but the activity of precatalyst is lower than main body activity of such catalysts, general per unit volume catalytic activity is 40～50% of a main body catalyzer, and the precatalyst thickness of bed layer is 1/6～1/2 of a primary catalyst.

Fig. 2 is the catalytic cleaner structural drawing.Among the figure, the same Fig. 1 of the meaning of 2～7 representatives; 1, expansion step; 14, pod apertures; A is a suction port; B is a relief opening; D is the cone upper-end inner diameter; D is a cone base internal diameter; L is the two ends perpendicular distance.By Fig. 2 the utility model purifier is that two ends are the cylindrical housings of cone, in the purifier of forming by upper and lower casing (suction port), at first load precatalyst bed 3, back filling main body beds 4, main body beds 4 can be provided with single or multiple lift, has convex ring for preventing that beds from moving forward and backward on housing.Except that aforementioned structure, for improving ingress airspeed and distribution,, have the expansion step of an evagination on the front cone part at upper and lower casing, the cone of housing preferably remains on D-d/L=0.4～3.5 simultaneously.Its pod apertures 14 be for the benefit of dispel the heat and the aperture that is provided with than big hole.

Fig. 3 is the structural drawing of purifying muffler.The meaning of 1～7,14 representatives such as Fig. 2 among the figure; 8, resonant cavity; 9, micropunch pipe; 10, dividing plate; 11, expansion cavity; 12, purifier afterbody cone; 13, tail pipe.By shown in Figure 3, its purifier part of the structure of the utility model purifying muffler is identical with purifier shown in Figure 2, and just the length of upper and lower casing lengthening adds a silencer behind the purifier in same housing.The structure of its silencer as described above.Below by example structure of the present utility model is given to illustrate further.

Example 1, catalytic cleaner

By structure system purifier shown in Figure 2, wherein go up, lower shell body is pressed into by the 1.0mm steel plate, the cone of purifier shell, D-d/L=1.3, interior dress ceramic honey comb is the catalyzer of carrier, (φ 125 * 40mm) for one of precatalyst bed, (it is the catalyzer (technology that its Preparation of catalysts method can be provided in number for 90105061.X in Chinese patent application by the design person) of active component that every φ 125 * 80mm) can select known technology catalyst system therefor or non-noble metal for use, and precatalyst per unit volume catalytic activity is 40～50% of a main body catalyzer for two of main body beds.Inorganic heat insulation layer is wide to be 20～40mm, thickness 3～6mm.Be wrapped in respectively outside precatalyst bed and the two main body beds cylindrical bodys.The flow-guiding radiation plate forms with the compacting of 0.5mm steel plate, and is integrally welded along the housing engagement edge behind the loading catalyst bed in the upper and lower casing, with spot welding the flow-guiding radiation plate is fixed on and makes the utility model catalytic cleaner on the lower shell body.

Example 2 purifying mufflers

By structure system purifying muffler shown in Figure 3, catalyzer is selected the spherical catalyzer of φ 5mm for use, the beds size is by example 1 but be welded into cylinder with the 1.5mm roll of steel plate, two ends are welded with stainless steel mesh, be loaded in the purifier shell behind the inorganic heat insulation layer of beds outer wrapping, other manufacture process is as described in the example 1.Silencing apparatus dividing plate 10 usefulness 1.0mm steel plates are made, and micropunch pipe 9 its calibers and tube wall micropore area can be with reference to common manufacturing silencing apparatus technologies.

Clarifier of the present utility model can be integral the formation purifying silencer for car exhaust with any kind automotive muffler assembly welding. Use clarifier of the present utility model can reach more than 80% (50,000 kilometers preventing test and car load bench test) to the purifying rate of CO and HC in the automobile Exhaust Gas. In addition, the utility model also can be used as purification or the purifying muffler use of other I. C. engine exhaust. Main feature of the present utility model is:

1, adopt the thermal insulation inorganic material covering, needn't tighten up with other when making the beds assembling again and add the sealing element, can make clarifier simple in structure, beds preparation technology precise decreasing is beneficial to processing, and assembling easily.

2, clarifier is added with stream guidance heat radiating plate and can prevents effectively that ground fuel from being ignited.

3, clarifier increases the improvement that preposition cleaning catalyst bed can be conducive to the air-flow distribution, and the caused main body beds of oil spout is burned when having prevented the automobile irregular operating, namely improves the service life that purifying rate has prolonged again clarifier.

Claims (4)

1, a kind of I. C. engine exhaust catalytic cleaner, the housing that it is characterized in that purifier is divided into upper and lower casing two-part, the housing inner catalyst is made up of precatalyst and main body catalyzer two-part, on lower shell body, have the flow-guiding radiation plate, precatalyst is seated in the gas inlet end of purifier, the main body catalyzer is positioned at thereafter, after the catalyzer filling upper and lower casing is welded together, and weld the flow-guiding radiation plate on lower shell body.

2, according to the described purifier of claim 1, it is characterized in that having on the upper and lower casing inwall annulus of convex, when with stamping technology system upper and lower casing, can on housing, stamp out dark 1～6mm, the groove of wide 4～20mm replaces annulus.

3, according to the described purifier of claim 1, it is characterized in that being surrounded with thermal insulation inorganic material outside beds 3,4 cylndrical surface, inorganic insulation pack layer 5 is promptly arranged, and inorganic heat insulation covering 5 can be made by adding an amount of vermiculite organic bond in sial or the alumina fibre.

4, according to the described purifier of claim 1, it is characterized in that it can be integral with the automotive muffler assembly welding, constitute the automobile exhaust gas purifying silencing apparatus.

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