Connection arrangement for pressure medium channels in a diesel engine

Abstract: Connection arrangement for pressure medium ducts in a diesel engine for connecting at least two ducts (2,3) of the same pressure medium system, which extend in the longitudinal direction of an engine block (1) and which are arranged successively in the flow direction of the pressure medium circulation of the system. The arrangement includes a set of different, preferably cylindrical, hollow duct assemblies (4) to be installed in a connection chamber formed in the engine block at a desired location. The connection chambers connect the ducts with each other (2,3) and each includes a connection aperture (5) on the side of the ducts for connection to devices or units (8,9), such as coolers. The duct assemblies (4) include two or more flow guidance apertures (4a,4b) located so as to accomplish different flow alternatives. The connection chamber is provided with one or more sealing surfaces (5a,6a,7,7') arranged to cooperate with the duct assembly (4) selected in each case so that the duct assembly (4) is sealed according to need to the connection aperture (5), to the wall between the ducts and/or to the upper and/or lower walls of at least one of the ducts.

Description: This invention relates to an engine block of a diesel engine, the engine block being in accordance with the preamble of claim 1. The invention relates especially to large diesel engines, which in this specification typically refer, for example, to the main or auxiliary engines in ships or to engines for power plants for the production of heat and/or electricity. In large turbocharged diesel engines it is necessary to cool both the charge air and the cooling oil. Normally cooling water, at both the inlet and outlet sides, is connected to coolers by means of separate pipes, which provides a complicated and, because of the costs, a disadvantageous solution. An alternative solution is to arrange for ducts to conduct cooling water within the engine block, which ducts, with advantage, are incorporated in the engine block during its casting. From the viewpoint of space requirements, the ducts in this case are with advantage arranged side by side in the engine block. A problem arises in this case of how to conduct cooling water from the parallel ducts into the coolers located outside the engine block so that the cooling water on the inlet and outlet sides are not mixed with each other. In practice the cooling water is first circulated through the charge air cooler and only then through the oil cooler. However, the order of the coolers in the longitudinal direction of the engine may change, which poses additional problems with the circulation of cooling water. An aim of the invention is to develop an improved engine block and in particular a connection arrangement for pressure medium ducts which are located in parallel in the engine block and by means of which inter alia the problems discussed above can be eliminated. In addition the engine block should be advantageous with regard to manufacturing costs and be versatile in providing alternatives for flow guidance for implementing different connection requirements for pressure medium flows. The aims of the invention are met as is set out in at least the ensuing claim 1. According to the invention there is provided an engine block as claimed in the ensuing claim 1. In this way the desired flow alternatives can be implemented by forming the connection chamber to comprise certain sealing surfaces and selecting a duct assembly suitable in each case so that it includes flow guidance apertures as required by the pressure medium flows. The engine block includes with advantage a duct assembly, which is sealed to the connection aperture and to the wall between the ducts so that it connects only the rearmost duct to the connection aperture leading out. If then it is not desirable that the flow in the foremost duct is blocked, the connection chamber can be formed so that it allows through-flow in the foremost duct past the connection aperture and the duct assembly installed in the connection chamber. The engine block can further include a duct assembly, which is sealed to the connection aperture and to the wall between the ducts and is provided with flow guidance apertures so that it connects only the foremost duct to the connection aperture leading out. In accordance with one embodiment the connection chamber is provided with sealing surfaces arranged in the connection aperture and in the wall between the ducts and with sealing surfaces arranged at the position of at least one duct preventing, with the duct assembly, flow in the duct in question past the duct assembly, whereby the duct assembly correspondingly is provided with at least one flow guidance aperture located at the mantle surface thereof at the position of the duct in question for leading the flow out from the duct in question, for instance for connecting the duct to the connection aperture leading out or for leading the flow from one duct to another. The sealing surfaces can be arranged at the position of both the ducts, whereby by providing the duct assembly with two flow guidance apertures, one at the position of either of the ducts, the flow can be let from one duct to the other. At the same time the connection between both the ducts and the connection aperture can be blocked. Hereby the flow can be led to the other side of the ducts, for instance to be led further into a device or part of the engine, or the direction of the flow can be changed. The present invention also relates to a diesel engine provided with an engine block according to the invention. Embodiments of the invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Figures 1 to 4 show different connection chamber solutions for tube assemblies included in a connection arrangement for pressure medium ducts of an engine block according to the invention and seen as a transverse cross-section with regard to the ducts; Figures 5 and 6 show cross sections E-E and F-F of Figures 1 to 4; Figures 7a to 7g show different tube assemblies to be applied for different flow alternatives; Figure 8 shows in principle how to apply the connection arrangement in a large diesel engine for a case in which parallel ducts in the engine block are included in a cooling medium circuit, to which are connected, in successive order, first a charge air cooler for a turbocharger and than an oil cooler; and Figure 9 shows a modification of the case in Figure 8, in which the mutual location of the coolers in the engine is reversed. In the drawings, reference numeral 1 indicates an engine block of a large diesel engine and includes pressure medium ducts 2 and 3 arranged generally parallel to each other in the longitudinal direction of the engine block. These ducts are formed during casting of the engine block and, at the same time, the ducts are provided with connecting chambers at locations planned in advance, and for a selected purpose, for leading pressure medium flows by means of connecting tubes through desired devices, for example coolers connected to the engine, as is schematically shown in Figures 8 and 9. Each connecting chamber includes a connection aperture 5, through which a tube assembly 4 selected for the purpose in each case is installed to guide pressure medium flowing in the ducts 2 and 3 in a desired way. The connection chamber also has an aperture 6 located in a separating wall between the ducts 2 and 3 and connecting the ducts with each other. The apertures 5 and 6 are equipped with sealing surfaces 5a and 6a, respectively, for sealing the tube assembly 4 located in the connection chamber. Additionally, the connecting chamber may be equipped, at the position of either one or both of the ducts, with sealing surfaces 7 and 7' arranged at the upper and/or lower wall(s). These sealing surfaces 7 and 7', together with the tube assembly 4, prevent flow in the duct past the tube assembly, whereby the flow may be guided in a desired manner by means of flow guiding apertures, located at different places in the tube assembly. If necessary, however, the outermost duct 2 of the engine block may be designed to comprise an expansion portion 2a and/or 2b for guiding the flow in the duct 2 past the tube assembly, for example as shown in Figures 2, 3 and 5. Figures 7a to 7g show different tube assemblies 4, which can be sealed to the sealing surfaces 5a and 6a of the connection chamber and additionally, if necessary, to the sealing surfaces 7 and/or 7' and which are equipped with flow guiding apertures positioned in different places for applying the desired flow alternatives. The flow paths in each case are shown by arrows. The reference numeral 4a indicates a flow guidance aperture provided in the mantle surface of the tube assembly and 4b correspondingly indicates a flow guidance aperture provided in the end surface of the tube assembly. The reference numeral 4c indicates a blocking wall arranged at the gable part of the tube assembly for preventing flow. The Figures also show schematically the use of possible expansion portions 2a and/or 2b of the connection chamber with the tube assembly in question. The Figures 7f and 7g show solutions for guiding pressure medium flow from one duct to another, whereby the pressure medium flow can be guided to devices located at either side of the flow ducts 2 and 3 in a desired order. Figure 8 shows schematically an arrangement where the parallel ducts 2 and 3 in an engine block are included in a cooling medium circuit and are connected one after another firstly to a charge air cooler 8 of a turbocharger (not shown) and then to an oil cooler 9. Correspondingly Figure 9 illustrates an alternative arrangement positioned at the flywheel end of the engine. In this case the order of the coolers 8 and 9 is reversed in the feeding direction of the pressure medium flow, which must be taken account of by using suitable connection chamber and tube assembly arrangements so that the flow is first led through the charge air cooler and only thereafter through the oil cooler. The flow is led into the duct 2 from the pressure side of a circulation pump (not shown) and possibly from a flow branch from a reserve pump and the duct 3 is connected to the suction side of the pump. With reference to the embodiment of Figure 8, the tube assembly 10 may be in accordance with Figure 7b and the connection chamber correspondingly in accordance with Figure 1, in other words of type A. Correspondingly the tube assemblies 11 and 12 may be in accordance with Figure 7a and the connection chamber may be of type A (Figure 1). The tube assembly 13 may be in accordance with Figure 7c and the connection chamber may be of type B (Figure 2) or alternatively the tube assembly 13 may be in accordance with Figure 7d and the connection chamber may be of type C (Figure 3). The tube assembly 14 may be in accordance with Figure 7a and the connection chamber may be of type A (Figure 1). Correspondingly in the embodiment of Figure 9, the tube assembly 10' may be in accordance with Figure 7b and the connection chamber may be of type A (Figure 1). The tube assembly 11' may be in accordance with Figure 7d and the connection chamber may be of type C (Figure 3). The tube assembly 12' may be either in accordance with Figure 7c or in accordance with Figure 7d and the connection chamber may be of type C (Figure 3). The tube assembly 13' may be in accordance with Figure 7a and the connection chamber may be of type A (Figure 1). The tube assembly 14' may be in accordance with Figure 7d and the connection chamber may be of type D (Figure 4) or, alternatively, the tube assembly 14' may be in accordance with Figure 7c and the connection chamber may be of type A (Figure 1). It is clear that the arrangements according to the invention are not dependent on the pressure medium used in each case but are applicable, for example, equally as well for water, oil or other pressure media. The tube assemblies are preferably cylindrical, because it is of advantage from the viewpoint of both manufacturing technique and the connection of the connection tubes.

Claims: An engine block of a diesel engine comprising at least two ducts (2,3) of a pressure medium system which extend in the longitudinal direction of the engine block (1) and connection means arranged successively in the flow direction of the pressure medium circulation of the system for connecting the two ducts (2, 3) either together or separately with one or more devices or units located at the side of the ducts and included in the pressure medium system so that a desired direction of flow is accomplished and so that pressure medium flow at the inlet and outlet sides are prevented from being mixed with each other, characterised in that the connection means includes a set of different hollow duct assemblies (4) installed in connection chambers formed in the engine block at desired locations, said connection chambers connecting the ducts (2, 3) with each other and each including a connection aperture (5) on the side of the ducts for connecting the connection chamber to one of said devices or units (8,9), in that each of the duct assemblies (4) includes two or more flow guidance apertures (4a,4b) located so as to accomplish different flow alternatives, and in that each connection chamber is provided with one or more sealing surface (5a,6a,7,7') arranged to cooperate with the duct assembly (4) selected in each case so that the duct assembly (4) is sealed according to need to the connection aperture (5), to a wall between the ducts and/or to the upper and/or lower walls of at least one of the ducts. An engine block according to claim 1, characterised in that the hollow duct assemblies (4) are cylindrical. An engine block according to claim 1 or 2, characterised in that at least one of said duct assemblies (4) is sealed to the connection aperture (5) and to the wall between the ducts so that it connects only the rearmost duct (3) to the connection aperture (5) leading out. An engine block according to claim 3, characterised in that the connection chamber in which said at least one duct assembly (4) is installed is formed so that it allows through-flow in the foremost duct (2) past the connection aperture (5) and the said one duct assembly (4) concerned . An engine block according to claim 1 or 2, characterised in that at least one further duct assembly (4) is sealed to the connection aperture (5) and to the wall between the ducts and is provided with flow guidance apertures (4a,4b) so that it connects only the foremost duct (2) to the connection aperture (5) leading out. An engine block according to claim 1 or 2, characterised in that at least one of the connection chambers is provided with sealing surfaces (5a,6a), arranged in the connection aperture (5) and in the wall between the ducts (2,3), and with sealing surfaces (7,7') arranged at the position of at least one duct preventing, together with the duct assembly (4), flow in the duct in question past the duct assembly, whereby the duct assembly (4) correspondingly is provided with at least one flow guidance aperture (4a) located at the mantle surface thereof at the position of the duct in question for leading the flow out from the duct in question, for instance for connecting the duct to the connection aperture (5) leading out or for leading the flow from one duct to another. An engine block according to claim 6, characterised in that said sealing surfaces (5a,6a,7,7') are arranged at the position of both the ducts (2,3) and in that the duct assembly (4) includes two flow guidance apertures (4a), one at the position of either of the ducts for leading the flow from one duct to the other, whereby at the same time the connection between both ducts and the connection aperture (5) is blocked. A diesel engine having an engine block (1) as claimed in any one of the preceding claims.

Inventors: JANSSON SVEN, NURMI HANNU, JANSSON, SVEN, NURMI, HANNU
Applicants: WAERTSILAE NSD OY AB
Application year: 1995
Main classification: F01P11
IPC codes: F01P11, F01M11, F02B3, F16L41, F02B29, F01P3