KR20210000679U - A segmented exhaust pipe for a large engine, in particular a longitudinally scavenged slow-running crosshead large engine - Google Patents

Abstract

Exhaust pipes (1) for large engines, particularly low-speed crosshead large engines scavenging in the longitudinal direction, are in each case a collection pipe having a plurality of connecting branches (3) which can be connected to a cylinder liner to receive and collect exhaust gases. (2) and an outlet pipe (4) which can be connected to the turbocharger to receive the exhaust gas, wherein the exhaust pipe (1) is through a plurality of flexible supports (5) for support on a large engine. It can be further connected to at least one non-flexible fixed foot 6. According to the invention, the exhaust pipe 1 is designed as a split exhaust pipe 1 having a plurality of exhaust segments 21. Furthermore, the present invention relates to a large engine, and in particular to a low speed crosshead large engine scavenging in the longitudinal direction, having an exhaust pipe of the present invention.

Description

A segmented exhaust pipe for a large engine, in particular a longitudinally scavenged slow-running crosshead large engine}

The present invention relates to a split exhaust pipe for large engines, in particular for low speed crosshead large engines scavenging in the longitudinal direction, according to the preamble of the independent claim.

Low speed large engines, in particular large engines scavenging in the longitudinal direction of the crosshead design according to the present invention, are preferably used in shipyards or, for example, in stationary plants for generating electrical energy, in a number of different variations in detail for decades. .

In many cases, these large engines contain three large housing segments, which form the frame of the engine. On the base plate with transverse support elements in addition to the bearing saddle with the crankshaft main bearing for receiving the crankshaft, a so-called stand is arranged and separated by a lowermost plate. Known stands comprise a plurality of support bodies arranged opposite to each other, corresponding to the number of cylinder liners of a large engine, each support body having a vertically extending sliding surface to guide two adjacent crossheads. , The cross head is connected to the crankshaft by a push rod. The cylinder part, commonly referred to as the cylinder shell, is then placed on the stand and is suitable for receiving one or more cylinder liner(s). The base plate, stand and cylinder parts are connected to each other by tie rods by screwing the tie rods into or onto the base plate under significant pre-stressing, where these tie rods are generally within the stand area. It extends within the support body.

In the operating state, by opening the outlet valve provided on the cylinder cover of the cylinder liner, the hot exhaust gas is supplied from the combustion chamber of the cylinder liner through the exhaust pipe to the charging group in the form of a turbocharger, whereby fresh air from the turbocharger is discharged. It is sucked and compressed and supplied as scavenging air to the individual combustion chambers of the cylinder liner of a large engine through a so-called scavenging slot in the lower region of the cylinder liner.

An example of such a large engine is disclosed among others in CN105545437A.

It is known to operate the engine by a diesel process, i.e. as a self-igniter or by an Otto process, in which the mixture can be clearly sparked with a suitable ignition source at a suitable crank angle. The fuels used are, for example, heavy oil, diesel, gas or other suitable fuels, which themselves are well known to those skilled in the art. There are more and more large engines of the type according to the invention on the market, which can also be operated as so-called dual fuel engines, with classic fuels such as heavy oil or diesel and also with suitable gases as fuel.

Exhaust pipes connected simultaneously to a plurality of cylinder liners in a manner known per se for discharging exhaust gases from the associated combustion chambers are generally supported to the engine by means of a plurality of flexible supports and essentially non-flexible or stationary supports. A non-flexible or fixed support, hereinafter referred to as a fixing foot, and thus also, the corresponding attachment on the exhaust pipe, which connects the exhaust pipe with a fixed support, i.e. a fixed foot, with respect to the longitudinal, lateral and vertical directions. It enables safe and reliable positioning of the exhaust pipe. In addition to the static and dynamic effects of pressure fluctuations and vibrations in the exhaust system and engine as a whole, as well as due to the enormous weight of these parts, among other things, the high-temperature insulated exhaust pipes at the top of the engine and attached further down the engine. Due to the temperature difference between the cold non-insulated fixed feet, the structural parts of the fixed feet are also exposed to thermal stress.

The current design in the prior art of the exhaust gas system described above is based on the principle that the exhaust pipe is first manufactured in a single piece and then in a second step the fixed foot is welded to the exhaust pipe. The exhaust pipe is built into the fixed foot. The fixed foot itself is usually wider than the distance between two adjacent cylinder liners and it is very difficult for a welder to weld to each other.

Accordingly, it is an object of the present invention to provide an improved exhaust pipe.

The subject matter of the present invention that fulfills this purpose is characterized by the features of the independent claims.

The dependent claims refer to a particularly advantageous embodiment of the present invention.

Accordingly, the present invention is a large, large-scale, in each case, a collection pipe having a plurality of connection branches that can be connected to a cylinder liner to receive and collect exhaust gas and an outlet pipe that can be connected to a turbocharger to receive exhaust gas. It relates to an exhaust pipe for an engine, in particular a low-speed crosshead large engine scavenging in the longitudinal direction, wherein the exhaust pipe can be further connected to at least one non-flexible fixed foot through a plurality of flexible supports for support on the large engine. . According to the present invention, the exhaust pipe is designed as a split exhaust pipe having a plurality of exhaust segments.

Therefore, it is essential to the present invention that the exhaust pipe is designed as a divided exhaust pipe having a plurality of exhaust segments.

Particularly advantageously, the exhaust segments are welded together in the form of a long pipe to form an exhaust pipe. In very special cases, the exhaust segments can also be connected to each other in different ways known per se to a person skilled in the art. As will be explained in more detail below, the fixed foot can particularly preferably be arranged in the central region of the exhaust pipe.

The invention also relates to large engines, in particular to a longitudinally scavenging low-speed crosshead large engine with an exhaust pipe of the invention.

By means of the invention, a single-piece exhaust pipe known from the prior art is now provided as a split exhaust pipe, which exhaust pipe is particularly preferably in length with exhaust segments corresponding schematically with the distance between two adjacent cylinder liners. It consists of. These exhaust segments are then welded together in the form of a long pipe. The fixed foot is also best designed in the form of a modular design and has an approximate length of the distance between two adjacent cylinder liners. This design of the exhaust pipe or fixed foot of the present invention is more accessible for welding operations and easier to manufacture than previously known designs. In addition, the new design makes it possible to provide an exhaust cone to the turbocharger in the area of the fixed foot, which was not possible with previously known designs. By using a special welding technique, all modules of the entire exhaust pipe, including the fixed foot, can be welded, in particular without stress, in particular with minimal deformation in the longitudinal direction.

The fixed foot particularly preferably comprises three rigid vertical plates, which are welded to the lowermost flange. Two side plates form the ends of the modules and extend to the lowest flange welded to them. The third plate is the rigid lowermost plate, which extends longitudinally between the two plates mentioned above and laterally in approximately the center of the exhaust pipe. It is also welded to the lowermost flange. The last mentioned plate takes all the longitudinal forces and is flexible in the lateral direction, while the first two plates mentioned take all the longitudinal forces and are preferably flexible in the lateral direction. The longitudinal direction is the direction in which strong thermal expansion of the exhaust pipe occurs.

In order to minimize the possible longitudinal movement of the exhaust pipe as much as possible in case the longitudinal plate of the fixed foot is completely broken, the fixed foot is provided approximately advantageously in the center of the exhaust pipe, and therefore always with at least one flexible support. surrounded.

Hereinafter, the present invention will be described in more detail with reference to the drawings. The present invention is shown as a schematic representation.

1 schematically shows an exhaust pipe with a flexible support and a fixed foot.
FIG. 2 is a perspective view of the exhaust pipe according to FIG. 1 as viewed from the opposite direction compared to FIG. 1.

The exhaust pipe 1 for a large engine, in particular for a crosshead large engine scavenging in the longitudinal direction according to FIG. 1 or 2 comprises a collecting pipe 2 having a plurality of connecting branches 3, The connection branch can in each case be connected to the cylinder liner to receive and collect the exhaust gas. The connecting branch 3 is not visible in FIG. 2 because the connecting branch is from a viewpoint on the opposite side of the exhaust pipe 1, which cannot be seen in FIG. 2.

In addition, two outlet pipes 4 are provided on the exhaust pipe 1, which in each case are connected to the turbocharger to receive exhaust gas in the installed state. For support on large engines not shown, in addition to the basically less flexible fixed foot 6, referred to herein as a non-flexible fixig foot 6 for the purposes of simplicity, it will be clearly seen. As may be possible, in this specification a plurality of flexible supports 5 of three are additionally provided at approximately the center of the exhaust pipe. According to the present invention, the exhaust pipe 1 is designed as a split exhaust pipe 1 having a plurality of exhaust segments 21 that do not all have the same length in this particular embodiment, as can be clearly seen. do. Indeed, it is particularly advantageous in another embodiment of the invention that most or all of the exhaust segments 21 have the same length, which distance particularly preferably corresponds approximately to the distance between two adjacent cylinder liners. Here, the exhaust segments 21 are welded together to form an exhaust pipe 1 in the form of a long pipe.

Those skilled in the art understand that the present invention is not limited to the explicitly discussed embodiment, and corresponding additional designs are also included in the present invention. In particular, the invention relates, of course, to all suitable combinations of the specific embodiments discussed.

Claims (4)

In the exhaust pipe (1) for a large engine, in particular a low-speed crosshead large engine scavenging in the longitudinal direction,
In each case a collection pipe (2) having a plurality of connection branches (3) which can be connected to a cylinder liner to receive and collect exhaust gases and an outlet pipe (4) which can be connected to a turbocharger to receive exhaust gases Including,
The exhaust pipe 1 may be additionally connected to at least one inflexible fixed foot 6 through a plurality of flexible supports 5 for support on a large engine,
The exhaust pipe (1), which is designed as a split exhaust pipe (1) having a plurality of exhaust segments (21). The exhaust pipe (1) according to claim 1, wherein the exhaust segments (21) are welded together to form an exhaust pipe (1) in the form of a long pipe. The exhaust pipe (1) according to claim 1 or 2, wherein the fixed foot (6) can be arranged in a central area of the exhaust pipe (1). Large engines with exhaust pipes (1) according to any of the preceding claims, in particular low speed crosshead large engines scavenging in the longitudinal direction.

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