CZ296520B6 - Exhaust gas conduit with exhaust silencer arranged in connection to vehicle heating equipment being independent on engine - Google Patents

Abstract

In the invented exhaust gas conduit (1) having exhaust silencer arranged in connection (A) to a vehicle heating system being independent on engine, there is proposed to make the entire exhaust gas conduit (1) up to the exhaust gas outlet (B) and including the exhaust silencer from flexible helical pipes (2, 3), whereby particularly the one-piece flexible inner pipe (2) has a perforated longitudinal section being enclosed by a sound insulating material (4) such as rock wool or the like and being inserted gastight in a one-piece flexible outer pipe (3).

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to an exhaust gas conduit with an exhaust silencer in connection to an engine-independent heating device of the vehicle, arranged up to the exhaust gas outlet.

BACKGROUND OF THE INVENTION

In the known exhaust duct, or in the known exhaust silencer for a vehicle heating apparatus, the through-pass exhaust duct is formed by a perforated pipe that is welded into the muffler shell. In the space between the perforated tube and the walls of the housing there is a sound-damping material such as mineral wool or a similar non-flammable damping material with a heat resistance up to 500 ° C. The perforated pipe is connected at the ends to straight or curved fixed connection pipes which lead on one side to the heating device and on the other side to the exhaust outlet. The known exhaust muffler is relatively expensive and poorly mounted, especially in relation to production costs. Depending on the line (straight or curved), the pipes are only suitable for a particular vehicle type. The silencer itself requires a relatively large installation space.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exhaust gas duct with an exhaust silencer of the type mentioned at the outset, which is easy to install, cost-effective to manufacture and operate efficiently and in particular to be variably mounted. ·

SUMMARY OF THE INVENTION

This object is achieved by an exhaust pipe with an exhaust silencer in connection with an engine-independent heating device of the vehicle, arranged up to the exhaust outlet according to the invention, the principle being that the entire exhaust pipe including the exhaust silencer is formed by a flexible coiled pipe. concerns essential components.

In particular, the exhaust ducts consist of a one-piece flexible inner tube having a perforated longitudinal section lined with a sound absorbing material such as mineral wool or the like and is gastightly inserted into the one-piece flexible outer tube.

The perforated longitudinal section of the inner tube has, for a particularly effective noise seal, a cross-sectional constriction, which consists mainly of local crushing of the inner tube.

The transverse constrictions preferably form opposing flat crushed points, while the rest of the circumference of the inner tube is formed without such crushing.

The particularly simple, compact design allows easy assembly when the inner and outer tubes are arranged concentrically to one another.

Advantageously, the outer tube is closed at least at one end by a front cover and is fixedly connected to the inner tube by this cover.

Alternatively or in combination, the outer tube may be tapered at least at one end and compressed or resistively welded to the inner tube.

Preferably, the exhaust gas conduit is designed such that the outer tube is watertightly connected to the inner tube.

The inner tube may also be perforated in the area of compression or resistance welding, or in the area of the end cap.

The tubes are preferably formed by a single-layer coil and the sound-damping material can also be coiled, especially in one or more layers.

The flexible tubes are particularly grooved coiled jacket tubes of preferably a single layer of stainless steel strip which can be bent slightly but still are stable and have a constant diameter.

By means of the invention, a simple exhaust gas line is produced which is easy to manufacture, functionally sound, dampens noise, is effectively sealed outwards and, in particular, is easy to mount. It is versatile and can be used for different types of vehicles in engine-independent heating systems. The exhaust duct, despite its flexibility, is dimensionally stable and does not require more mounting points on the vehicle than a rigid pipe duct. Also, the length of the exhaust gas conduit can be easily varied, since the flexible tubes are so-called meter goods and the desired length can thus be easily cut. The length, diameter, number and layout of the perforation holes as well as the number, layout and depth of the taper in the cross section of the inner tube in the region of the perforated sections can be determined in substantial quality and size of the muffler.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an exhaust gas conduit with an exhaust silencer in a schematic axial section; FIG. 2 shows an internal exhaust gas conduit according to FIG. 1 in a cross-sectional taper in a schematic cross-section; Fig. 3 shows another exhaust gas line in a schematic partial section in the upper wall region of the perforated longitudinal section, and Fig. 4 a third exhaust gas line in a schematic partial section in the upper end region of the wall of the perforated longitudinal section.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIG. 1, the exhaust line 1 with the muffler in port A to a vehicle engine-independent (not shown) heater up to the exhaust outlet B comprises two straight flexible tubes 2 and 3.

Both pipes 2, 3 are formed in one piece and in one layer, they are grooved stainless steel coil casing pipes and run coaxially to each other, the inner flexible pipe 2 extending concentrically through the outer flexible pipe 3 and the outer pipe 3 having shorter longitudinal extension than inner tube 2.

The flexible inner tube 2 has a central perforated longitudinal section with openings 8 which are uniformly distributed along the length and circumference of the tube 2.

-2GB 296520 B6

In the circular gap between the outer tube 3 and the inner tube 2 there is a sound-damping material 4 such as mineral wool or other comparable damping material which is non-flammable, asbestos-free and temperature-stable up to 500 ° C.

In contrast to the partially perforated inner tube 2, the outer tube 3 has a generally wall without openings and surrounds the inner tube 2 in a gas-tight and watertight manner in the region of its perforated section. of sheet metal. The vertical part “Z” determines the width of the circular joint or the distance between the outer and inner pipe. The ends or bases "Z" are fastening flanges for the form-stable, waterproof and gas-tight connection of the axial ends of the outer tube 3 to the outer circumference of the inner tube 2.

The perforated longitudinal section of the inner tube 2 is provided with three constrictions 5 in cross-section with equal spacings which are formed by local crushing of the inner tube 2, as is particularly evident in Fig. 2. the rest of the circumference of the inner tube 2 remains free of such crushing. The constant diameter d of the inner tube 2 is reduced in three places by crushing to a smaller dimension a.

From a small number of individual components, it is evidently made up of a compact, dimensionally stable and yet flexible exhaust pipe on the discharge side of the vehicle's heating system, which can easily be fitted individually on the vehicle. A particular advantage of the invention is that the exhaust gas duct can be laid in the bends not only in the ends of the inner tube 2, but also in the area of the outer tube 3, i.e. in the area of the silencer in which the flexible damping substance of the same dimensions is located. Thus, the initially straight tubes 2, 3 can be arbitrarily curved in a wide range during final assembly on a vehicle. The curvature is determined primarily by the mounting conditions on the vehicle, but also by the characteristics of the silencer which, by curving, obtains certain noise-insulating properties and a certain tonal spectrum which can be determined by the test. The vehicle can thus be manufactured in a particularly simple manner with the individual noise characteristics of the running engine.

Since the flexible pipes 2, 3 are so-called meter goods, the various pipes can be length-adjusted in a simple manner and thus different lengths of the silencer can also be designed to provide different noise characteristics. At the same time, it is even possible with the same inner tubes with a given length of the perforation sections or openings 8 to achieve different noise characteristics, depending on the length of the end section C of the outer tube 3 according to FIG. is performed by compression or resistance welding to reduce the cross-section of the outer tube. For example, if the curvature 9 narrowing in cross-section of the outer tube 3 of FIG. 4 is further to the right, more space is available for the soundproofing material 4, thereby increasing the damping capabilities of the exhaust silencer. Despite the same pipe length, different exhaust silencers can also be assembled due to the different compression of the end section C.

The exhaust gas conduit shown in FIG. 3 with an integrated muffler is characterized by a particularly compact wall design, since not only the pipes 2 and 3 but also the sound-damping material 4 are designed as single-layered.

According to FIGS. 1 and 4, crushed mineral wool is used as sound absorbing material 4.

It should also be noted that the features capable of protection, contained separately in the additional claims, despite the formal formal feedback on the main claim, must have corresponding independent protection. In other cases, all features of the invention are included in the general application data within the protective scope of the invention.

Claims (13)

An exhaust pipe (1) with an exhaust silencer in connection (A) to an engine-independent heating system of the vehicle, arranged up to the exhaust outlet (B), characterized in that the entire exhaust pipe including the exhaust silencer is formed by flexible pipes (2, 3). Exhaust gas conduit according to claim 1, characterized in that the exhaust gas conduit is a one-piece flexible inner tube (2) having a perforated longitudinal section lined with a sound absorbing material (4), such as mineral wool or the like, and embedded in a gas-tight manner. one-piece flexible outer tubes (3). Exhaust gas line according to claim 2, characterized in that the perforated longitudinal section of the inner tube (2) has a cross-sectional narrowing (5). Exhaust gas line according to claim 3, characterized in that the cross-sectional constrictions (5) are formed by local squeezing of the inner tube (2). Exhaust gas conduit according to claim 4, characterized in that the cross-sectional constriction (5) is formed by flat opposing crushed points (7) and the rest of the circumference of the inner tube (2) is formed without such crushing. Exhaust gas line according to one of Claims 2 to 5, characterized in that the inner tube (2) and the outer tube (3) are concentrically arranged with respect to one another, Exhaust gas conduit according to one of Claims 2 to 6, characterized in that the outer tube (3) is inserted in at least one longitudinal end into the end cap (6) and connected by the end cap (6) to the inner tube (2). . Exhaust gas line according to one of Claims 2 to 7, characterized in that the inner tube (2) is pressed or resistively welded at least at one end (C) in a taper of the cross-section with the inner tube (2). Exhaust gas conduit according to claim 7 or 8, characterized in that the outer tube (3) is water-tightly connected to the inner tube (2) at the ends. Exhaust gas line according to one of Claims 7 to 9, characterized in that the inner tube (2) is also perforated in the area of compression or resistance welding or in the area of the front cover. Exhaust gas line according to one of Claims 2 to 10, characterized in that the tubes (2, 3) are wound in a single layer. Exhaust gas line according to claim 11, characterized in that the soundproof material (4) is wound in one or more layers. Exhaust gas conduit according to one of Claims 2 to 11, characterized in that the pipes (2, 3) are grooved coiled jacket pipes of preferably one layer of stainless steel strip.