DE2900318A1 - Afterburner system for IC engine exhaust - has burner, cooler and silencer built into units which are permanently joined together - Google Patents

Abstract

The exhaust arrangement for an IC engine incorporates an afterburner secion in which the exhaust gases are purified. The exhaust arrangement further incorporates a cooling section for the afterburner, a silencer, a heat exchanger and an ignition arrangement. The outer body of the system is made up of three basic sections which are joined together. The sections are built up into the various units, using parts made from hardened steel sheet, ceramic, copper and aluminium before they are assembled. Two section are in the shape of half cylinders which are joined welding or seam folding.

Description

Eeschreiouzg

In contrast to an exhaust system, of which only the sound-absorbing Function is required, the manufacturing difficulties are considerable, in a not much more extensive compact system also the function of the To accommodate exhaust gas purification in accordance with the process. Practically, i.e. at the same time economically wearably, this has only been possible since the. described in the main patent Construction succeeded, a uniform one for all operating states of the combustion engine To realize a burn-up zone in which not only the burn-up occurs when the engine is idling small amounts of gas that arise, but also the full-load burn-up of all speed ranges remains anchored. This could only be done at the same time with an internal cooling device, that acts directly on the afterburner head. The one in such a compact system The functional sequence of exhaust gas conversion to be solved must therefore be in addition to sound-absorbing Components, heat exchangers for heating the incoming exhaust gas, exhaust gas / additional air supply and mixing devices have at least two cooling sections at the same time: firstly the above-mentioned afterburner head cooling and secondly a cooling device at the gas outlet of the device. In addition, there are usually two different injection systems : firstly for the additional air required for combustion, secondly for the cooling air throughput in the outlet section of the post-burned exhaust gas. Despite the abundance of these different interlocking functional processes must be used in manufacturing just stay. Solving this is the task of the following in relation to the Manufacturing process described construction.

The Ralb shell construction developed in modern silencer construction forms the starting point. Here it is possible in an open half-shell in one very simple and clear manufacturing process to anchor the inner part, and either by dotting or by anchoring lines in recesses, which are already provided in the half-shell during the pressing process.

The second half-shell can also be anchored depending on the construction concept Internal parts received and is then closed by roll seam with the first half-shell connected to an objectively uniform body. The one for the afterburner construction The design idea presented here is initially purely in principle, To use half-shells as shown in Figure 2 of the schematic drawing: the The shell designed in the longitudinal direction has only one shell-like closure, in which the strip-like sheet metal zone required for the roll seam is provided so that after the two shells have been welded together, one side of the elongated device body is closed is; the other end of the device of the half-shell hollow body remains, usually in one Zone of its largest cross-section, open and is designed as a closing body third shell closed, which, like the other two shells, has an anchoring surface for interior parts.

In the schematic drawing in FIG. 1, these three shells are used as base shells to be named, labeled 1a, Ib and 1c. The shell 1c is in the schematic drawing only designed as a cover, with a narrow peripheral edge 30. The claim 10 indicates that it can also be implemented as a spacious room part.

It can then of course also be made in half-shell type, which does not change anything in the production concept presented.

This possibility of large-scale deployment of a shell system 1c realizes the further essential aspect of the submitted rating system, for each spatial layout of the roughly reflective HalW £ shells la + Ib with a number of different sized closing body shells 1c a larger group of motors different cubic capacities to be recorded without being used for these different applications all production tools would have to be redesigned immediately.

The honing process proceeds as shown in the example of the diagram in the figure 1 is described as follows. In the half-shell 1 a are made by welding introduced the lines 37 (blower air supply), 31 and 32 (.iogas supply) and 33 (irin cooling pipe). In the half-shell 1b, everything is made of chrome-nickel steel Inner part of the space body 18 (circumferential wall 21) fastened by that the line 29 (cooling air outlet) and the line 13 (additional air inlet) to the The perforations provided for this purpose are welded on the outside in the alb shell. the Circumferential wall 21 of this inner body is to secure the distance to the rasisschalen la and 1b provided with the spacer and sealing bodies 23 and 22, which (see. Claim 3) are designed as sliding separating sections with annular spaces in which there is sealing material (24) is located. In this way, the wall of the base shell la is also sufficient close to the molded parts 22 and 23, the sealing material at the same time the small Compensates channel-like depression, which is usually in the area of the rolled seam inside forms.

After the guide for the outside on the half-shell 1b to be inserted aluminum part 34 is welded, the half-shells 1a and ib are rigidly connected by seam welding or folding.

The entire space body 15 (ignition chamber with ceramic part 26), 16 (i.achbrennerkopf with reversal wanaung and additional air jets 42), and 17 (afterburner extension room with track 20) is firmly connected to the base shell 1c, either by screwing (25) or in some other way. As patent claim 10 states, these inner parts 15-18 can also be accommodated in a large-volume base shell 1c be, so that for larger engine lifts on simple catfish correspondingly larger Roof combustion chambers are created.

Like the schematic drawing with the dashed. Lines 50 and 51 only indicates, various switching of the air flow rate are possible without Tool sets would therefore have to be changed.

The possibility of the injector-operated air flow is not shown of the inner cooling pipe 33 to connect to the line 29 and thereby the air throughput to effect in rooms 38 and 39. For this and all other circuits you can the lines belonging together can be arranged in almost any spatial proximity : z.E in that the inner part 18 (with the peripheral wall 21) with the lines 13 and 29 welded to the base shell la will.

Am among these manufacturing-facials made devices per fulfills the service-completeness criteria to be set for such a device by being able to be dismantled at the functional areas that control at intervals, the Consideration of all expansion factors to be observed by the ones provided therein.

Sliding sections and an economically sensible integration of different Materials with each other. Since .E. the exhaust gases from two-stroke engines on simple sheet steel inner walls cause almost no corrosion and the outer surfaces are inexpensive in a suitable manner are to be protected from corrosion, with this construction, for example, the price advantage be achieved to manufacture the half-shells 1a, 1 and 1c from simple sheet steel. From a purely aesthetic point of view, one is made from Ilaib shells of the type described The body of the device is always more elegant than a purely cylindrical body.

L e r s e i t e

Claims (12)

Additional application to patent no. 2 055 001 Designation: Manufacturing process an afterburner compact system claims exhaust system for internal combustion engines with an I-post combustion device, which has an air-cooled afterburner part has and with a number of functional additional devices that are common to the usual The entire system of an exhaust system of this type (such as soundproofing devices, Heat exchange paths for incoming exhaust gas, additional air, cooling sections for outgoing gas Exhaust gas, ignition devices), is combined to form a compact device body the manufacture of which materials of various types (simple and refined sheet steel, Ceramics, copper, aluminum) in an economical way and a workshop service system be used accessible, characterized in that the device outer body from three base shells (la, 1b, 1c), each of which in the open state with the required internals is provided before they are assembled. 2. Exhaust system according to claim 1, characterized in that this assembly in the case of two approximately mirror-like half-shells (1a + Ib) by rolled seams or seams he follows. 3. exhaust gas dispenser according to one of the preceding claims, characterized in that that the usually multi-stage combustion chamber space (mostly consisting of exhaust gas and Additional air supply lines such as 11-14 and functional follow-up rooms such as 15 - 18) both with each other (currently sliding wall parts 20 and 21) as in relation to the outer walls of the device body (1a, Ib) are provided with gleiter.den separating distances is (22, 23), which, depending on requirements, have seals (24) against gas throughput. 4. Exhaust system according to one of the preceding claims, characterized in that that the base shell (1c), which is the closing body for a physical Unit assembled base shells (la + 1b) represents, with the possibility of a later removability is added (example screw connection 25). 5. Exhaust system according to the previous claim, characterized in that the Base shell (lc) after removal, the burner head with the ignition system (15) and a Uncovered insight into the entire axial interior (14, 18, etc.). 6. Exhaust system according to one of the preceding claims, characterized in that that the ceramic ignition chamber part (26) of the afterburner head (15/16) is exchangeable is. 7. Exhaust system according to one of the preceding claims, characterized in that that the entire .T; achbrennkammer-Wardung part (27) can be removed. 8. Exhaust system according to one of the preceding claims, characterized in that that in relation to the thermally loaded llaut elements (example: C'Iachburner room 16/17) only one rigid attachment (shell 28 connected to 1c) is provided. 9. Exhaust system according to one of the preceding claims, characterized in that that provided in an inner component several rigid attachments only be provided if the Eefesti supply element at the same time thermal gradient walls owns (e.g. as a flow line for a cooler medium such as lines 11, 12, 13, 29). 10. Exhaust system according to one of the preceding claims, characterized in that that the base shell (1c), which is the closing body for the assembled base plates (1a + 1b) represents, is a large-scale component, within its peripheral walls the afterburner head (16) with ignition chamber (15) or, if necessary, the afterburner extension chamber (17/18) or parts thereof are located. 11. Exhaust system according to one of the preceding claims, characterized in that that inlet or outlet lines, which the Pasisschalen from penetrate from the outside (e.g. 3. 31,32,13,29), applied flush or on other can also be fixed in such a way that the entire slide wall and inner part (23) provided with a sealing zone can be removed from the base shell (1c) and the position through a rigid connection of the walls 20/21 or other Way is fixed. 12. Exhaust system according to one of the preceding claims, characterized in that that the device body penetrating internal cooling pipe (53) in the area of the downstream Gas outlet section 35/36 only in its upstream penetration area of the Base shell is rigidly attached and with its downstream part the threading section for a gas guide part made of aluminum with partial flow distribution and internal cooling section (34) forms, which is threaded and fastened from the outside.