SE443829B - Extinguishing device for an exhaust system in an internal combustion engine. - Google Patents

Abstract

The invention concerns a device designed for use in an internal combustion engine's exhaust system to produce a spark extinguishing effect and prevent heated particles from leaving the exhaust system. The device principally involves a closed container (1) with an inlet arrangement (3) at one end and an outlet arrangement (9) at the other end. The main aspect of the invention is that the spark extinguisher (1) contains units (6, 7) which deflect incoming exhaust, and any heated particles that stream through the container (1), into an axial, spiral-formed path during which solid particles are broken up and/or burned up.<IMAGE>

Description

a1o1217-s 10 15 20 25 30 35 .Jiršfk which causes high fuel consumption and a lower power output.

The spark extinguishers provided also comprise a large number of parts and as a result the manufacture also becomes relatively expensive.

In a further known embodiment, the spark extinguisher is designed as a closed container formed by two halves interconnected.

Said halves are substantially capillary-shaped and in the respective periphery each of the halves is provided with a flange with which the halves abut each other, against each other. In the boundary line between the halves, a pointed peripheral space is formed on the inside. In such a spark extinguisher, the inlet is arranged so that the exhaust gases start tangentially in the axial central plane of the container, i.e. in the boundary line between the halves. The outlet from the spark extinguisher is arranged in the axial center of one half. In such a spark extinguisher, centrifugal forces cause any solid particles to rotate in a circular path where the diameter of the container is largest. This means that all glowing particles are made to rotate in one and true plane. However, the shape of the container means that such a plane is axially not significantly delimited by the outlet of the container. This means that the spark extinguisher does not always work as intended. To that extent, glowing particles can be mixed with the exhaust gas stream to the outlet with the result that glowing particles can also be led out into the surrounding space. The present invention relates to a spark extinguisher which does not have the above-mentioned disadvantages of known embodiments. The spark extinguisher according to the invention comprises a substantially cylindrical closed pipe holder with an inlet connection and an outlet connection and is thereby characterized in that the container at the inlet connection is provided with a deflecting member comprising a helical guide rail and / or a guide body shaped in the container. attached to the inlet adjacent to the inlet, which deflecting means controls incoming exhaust gases and glowing particles to flow through the container in the axial direction.

With such a design, a small flow resistance and a reliable function are obtained in terms of the ability to prevent glowing particles from leaving the spark extinguisher. In addition, the spark extinguisher according to the invention comprises only simple and few details, which facilitates and cheapens the manufacture of such units. The other features of the invention appear from the following description of an exemplary embodiment of the invention. The description is made with reference to the accompanying drawing, in which Figure 1 shows a cross-section 8-B according to Figure 2 of a spark extinguisher according to the invention and Figure 2 shows a longitudinal view of the spark extinguisher with a partially shown longitudinal section, the upper left part of said figure shows the spark extinguisher seen from the outside in a view A according to Figure 1.

A spark extinguisher according to the invention consists of a cylindrical container 1 with two ends, an inlet end 5 and an outlet end 8.

An inlet nozzle 3 is welded transversely to said container 1 with an almost tangential connection to one end of the jacket surface 2 of the container. The inlet nozzle 3 is intended to be connected in a per se conventional manner to an exhaust system of an internal combustion engine (not shown). ). With respect to this, the inlet nozzle 3 is formed with a number of slots 12 to enable radial clamping.

At the inside of the inlet end 5 a guide body 6 is centrally welded. This is shaped as a truncated cone with an axial extent past the mouth of the inlet socket 3 in the container 1. The largest diameter of the guide body 6 is approximately equal to the axial extent of the guide body 6.

A helical guide rail 7 is welded to the guide body 6, which encloses the guide body 6 approximately 270 ° starting from the lower part of the mouth of the inlet socket 3 in the container 1. The guide rail 7 extends radially towards the inner circumferential surface of the container 1 and axially to a distance corresponds to the axial extent of the guide body 6.

In order to obtain a compliant adaptation to said guide rail 7, a circular segment-shaped guide plate 11 is welded to the lower part of the inlet socket 3, which is intended to guide the gas flow, assuming a tangential inflow direction in the container 1.

At the other end of the container 1, a central outlet socket 9 is welded to the outlet end 8. This is designed with axial extension both inside and outside the outlet end 8.

A spark extinguisher designed in this way can form a separate unit connectable to the exhaust system of an internal combustion engine.

In the exemplary embodiment, however, the outlet end wall 8 also constitutes a wall for a spark extinguisher I following silencer 10.

In other words, the spark extinguisher 1 is integrated with the muffler 10 into a common unit. This means that the cylindrical jacket of the container 1 extends past the end plate 8 and also forms the jacket of the muffler 10. In figure 2 the muffler 10 is only partially shown. since the construction thereof is not essential to the understanding of -Lc-J-unøíf f »_ 8107217-5 10 15 20 25 30 35 the present invention. In such an integrated unit, the muffler is designed with an outlet (not shown) from which exhaust gases are discharged into the atmosphere. Q The function of a spark extinguisher according to the invention is as follows.

Combustion exhaust gases are intended to be initiated in the spark extinguisher through the inlet stage 3, whereby both exhaust gases and any glowing particles are deflected by the guide plate 11, the guide body 6 and the guide rail 7 in an axial and helical path in the container 1. The glowing particles have a larger mass than the exhaust gases. Due to this, centrifugal forces will press the particles against the inside of the jacket tube of the container 1, along which the particles describe a helical path. By exposing the particles to a certain frictional force of the inner mantle surface of the container 1, the particles will be rapidly decomposed into smaller particles which quickly go out in cases where they are not completely burned.

Most glowing particles initiated in the spark extinguisher have a relatively small particle size which means that they go out and / or completely burn before the particles reach the outlet end 8. In cases where the particle size is larger, the particles will, in accordance with the above, be led in a helical path to the outlet end. next to which the particles describe a circular path during which they are successively reduced in size and / or burned.

By inserting the outlet nozzle 9 into the container 1 from the outlet end wall 8, this prevents larger particles from accompanying the exhaust gas flow out through the outlet nozzle 9.

In the same way as solid particles, exhaust gases will also pass axially through the spark extinguisher in a spiral-shaped path. However, the mass of the exhaust gases is relatively small and therefore the exhaust gases are not affected by centrifugal forces to the same extent as the solid particles. This enables the gases to be discharged through the central outlet nozzle 9 without much resistance.

By deflecting incoming gases and particles in the axial direction by the guide rail 7, exhaust gases and particles entering the spark extinguisher are prevented from mixing with exhaust gases and particles which have already rotated one or more revolutions in the container 1. The design thus enables even axial flow for both gas and particles in the spark extinguisher. This is advantageous for extinguishing glowing particles in the container 1 and it also provides an advantage in the form of a small flow resistance. The invention may, within the scope of the appended claims, obtain other embodiments than those described above. Thus, for example, the inlet end 5 and the guide rail 7 can be designed as an integrated unit, just as the guide body 6 can also be integrated with the end wall 5 and / or the guide rail 7. In some cases, the guide body 6 should also be completely eliminated.

The spark arrestor does not have to be assembled with a muffler as described, but it can just as well be designed as a separate unit.

In this case, the spark arrestor can also be placed after the muffler in the direction of flow of the exhaust gases, I

Claims (5)

'i ”a1o7211-s ß 10 15 20 25 P A T E N T K R A V Apparatus in an exhaust system for an internal combustion engine for acting as a spark extinguishing and preventing glowing particles from leaving the exhaust system, said apparatus comprising a substantially cylindrical closed container (1) with an inlet closure (3) arranged to transversely open the container tangentially in the container ) at or near one end (5) of the container (1) and an outlet connection (9) arranged centrally in the second end (8) of the container (1), characterized in that the container (1) at the inlet connection (3) is provided with a deflecting member comprising a helical guide rail (7) housed in the container (1) and / or a guide screw (6) which is designed as a truncated cone and attached to the end wall adjacent to the inlet (SL which deflecting member (7) ) controls incoming exhaust gases and glowing particles to flow through the tank (1) in the axial direction. Device according to claim 1 with a deflecting member (7) comprising the guide body (6), characterized in that the guide body (6) extends into the container (1) past the inlet connection (3) and that the guide rail (7) is attached to the guide groove (6) along its axial extent and formed with radial extension to the inner mantle surface of the container (1). Device according to one of the preceding claims, characterized in that the outlet connection comprises a socket (9) which extends into the container (1). Device according to one of the preceding claims, characterized in that the container (1) is assembled with a muffler (10), the sheath tube (2) of the container (1) also forming a sheath tube for the muffler (10). Device according to claim 4, characterized in that the outlet device (9) of the device opens into the muffler (10).