JP5800792B2 - Connecting flange for high pressure conduit - Google Patents

Description

  The present invention relates to a flange for connection of high-pressure piping for a high-pressure connection of a crosshead large low-speed uniflow turbocharged two-cycle diesel engine, and a flange and pipe assembly. The invention also relates to a method of manufacturing a high pressure conduit.

  Crosshead large two-cycle diesel engines are typically used as propulsion systems for large ships or as prime movers for power generation equipment. Typically, these engines are operated with heavy fuel oil or with fuel oil.

  In recent years, for large two-cycle diesel engines, in addition to being able to handle alternative types of fuel, such as coal slurry containing hard particles and petroleum coke, in the case of clean fuel such as DME In addition, it is also required to avoid seizure between the plunger and the barrel. Such fuel needs to be heated and delivered to the engine cylinder in a highly pressurized state in order not to condense or clog the fuel supply system. For example, another fuel used in gas tankers such as LNG tankers is liquefied natural gas. Such gases need to be kept at high pressure. When used as a fuel for a crosshead large two-cycle diesel engine, LNG must also be delivered under ultra high pressure.

  Furthermore, there are many high-pressure systems such as a cylinder lubrication system, an intake valve and exhaust valve operation system, and a fuel valve operation system in the crosshead large two-cycle diesel engine.

  In a ship, such a high pressure system becomes dangerous if a leak occurs in the system. Leakage fluid traveling through the high pressure system can itself be dangerous for personnel in the engine room. Leakage can cause failure of critical components of the engine, which can lead to engine failure, which is costly and time consuming. Thus, in a crosshead large two-cycle diesel engine, most or all of the high pressure connections are formed as a double layer conduit having two sets of pipes or conduits. A high-pressure fluid flows through the inner pipe. The outer pipe can serve multiple purposes. One is to form a containment barrier when the inner pipe leaks or breaks. The other is the arrangement of various forms of leakage sensors. The space between the inner and outer pipes can also be used for ventilation, cooling, heating, etc.

  In the prior art, such high voltage connections have been made as straight conduits. Building a double pipe structure is very time consuming. First, it is necessary to weld the inner pipe onto the hub. It is then necessary to fit the outer pipe over the inner pipe and weld it to the hub. This welding process is complex and inevitably deposits weld spatter inside the welded piping. This process is very cumbersome and time consuming. Several types of marine engines are provided, but each engine is individually adapted to specific ship specifications. Therefore, the connecting portions are not modular and need to be configured individually.

  Therefore, a need exists for a high pressure conduit of a type that is flexible and easy to assemble.

JP 7-103374 discloses a flange according to the preamble of claim 1 thereof.
JP-A-7-103374

  Against this background, it is an object of the present invention to provide a flange for connecting a pipe to another element that can avoid weld spatter inside the pipe. A further object is to provide a flange for connecting a pipe to another element, in which a connection can be easily welded in a tight space, even in difficult working postures. A further object is to provide an alternative flange for connecting the tube to another element.

  This object is achieved by providing a flange for connecting the tube to another element. A flange body having a proximal surface and an opposing distal surface for attachment to the other element; a central hole in the flange body, wherein the inner tube is connected to the flange. A central hole sized and formed to receive and support the end portion of the inner tube so as to be fixedly connectable and open to the proximal surface and the distal surface A central bore; at least one welding recess provided as an enlarged portion of the central bore and opening in the proximal face, for welding between the end portion of the tube and the flange And at least one welding recess provided to provide space.

  In one embodiment, the at least one welding recess is formed as one or more openings or holes that connect to the central hole and the proximal end face of the flange and form an enlarged portion at the proximal end of the central hole. May be. In the case where there are two or more such welding recesses, these are discontinuously distributed around the outer periphery of the proximal end of the central hole.

  Alternatively, the welding recess is an annular enlarged portion of the central hole. Thus, the enlarged portion is provided along the entire circumference of the proximal end of the central hole.

  In an embodiment, the central hole may have a main section whose cross-section corresponds to the end portion of the tube, the central hole further opening in the distal surface of the flange body. The cone portion may be provided to correspond to the fitting zone of the tube. The fitting zone has a conical shape corresponding to the conical portion.

  In one embodiment, the distal surface is formed on a protrusion that extends distally from the flange body, and a distally facing shelf is formed around the protrusion. . The shelf facing the distal side and the protrusion are provided for connection to an outer tube.

  It is a further object of the present invention to provide a flange and tube assembly for connecting a tube to another element that can avoid weld spatter inside the tube. A further object is to provide a flange and tube assembly in which a connection can be easily welded in a confined space, even in difficult working postures. A further object is to provide an alternative flange and tube assembly.

  This object is achieved by providing a flange and tube assembly comprising a flange and a tube having an end portion. Wherein the flange is a flange body having a proximal surface for attachment to another element and an opposing distal surface; a central hole in the flange body, the proximal surface And a central hole opening in the distal surface. The central hole is sized and formed to receive and support an end portion of the tube to securely connect the tube to the flange. The assembly further comprises at least one welding recess provided between the end portion of the tube and the flange, the at least one welding recess being on the proximal surface of the flange. Open and the welding recess is configured to provide a space for welding between the end portion of the tube and the flange.

  In one embodiment, the proximal end of the end portion is welded to the flange at or near the proximal face of the flange.

  In certain embodiments, the welding recess is formed by a recess at the proximal end of the end portion of the tube.

  In certain embodiments, the at least one welding recess is alternatively or additionally formed as at least one enlarged diameter portion of the central hole in the flange.

  At least one welding recess is connected to the central hole and the proximal end face of the flange, and may be formed as one or more openings or recesses that form an enlarged portion at the proximal end of the central hole. Alternatively or additionally, the at least one welding recess may be formed as one or more openings or recesses provided in the outer surface of the proximal end of the end portion of the tube. In the case where there are two or more such welding recesses, they are discontinuously distributed on the outer periphery of the proximal end of the central bore and / or the outer surface of the proximal end of the end portion of the tube.

  In certain embodiments, the welding recess may be formed as an annular enlarged diameter portion of a central hole in the flange, or the welding recess is an outer periphery of the outer surface of the proximal end of the end portion of the tube. It may be formed as an annular depression.

  In an embodiment, the welding recess is formed between an enlarged diameter portion of the central hole and a recess at the proximal end of the end portion of the tube.

  In one embodiment, the central hole comprises a main section having a cross-section corresponding to the front end portion of the tube, and the central hole further has a conical portion opening in the distal surface of the flange body. The conical portion is provided so as to correspond to a fitting zone of the tube, and the tube has a conical shape corresponding to the conical portion;

  In a further embodiment, at least one second hole is provided through the flange body, the second hole opening in the proximal surface and the distal surface.

  In one embodiment, the distal surface of the flange is formed on a protrusion extending distally from the flange body, and the shelf facing the distal side around the protrusion. And the shelf facing the distal side and the protrusion are provided to connect the outer tube.

  In one embodiment, the outer tube has a proximal end and a conical portion formed at the proximal end, and the conical portion and the ledge of the flange form a second welding recess. The second welding recess is provided to provide a space for welding between the proximal end of the outer tube and the flange.

  In a further aspect of the invention, the above objective may be provided by a method for manufacturing a high pressure conduit. Wherein said high pressure conduit comprises a flange and tube assembly comprising a flange and a tube having an end portion. A flange body having a proximal surface for attachment to another element and an opposing distal surface; a central bore in the flange body, the proximal surface and A central hole opening in the distal surface. The central hole is sized and formed to receive and support the end portion of the tube that is fixedly connectable to the flange. The assembly further includes at least one welding recess between the end portion of the tube and the flange. The welding recess opens into the proximal surface of the flange. And the method includes placing the end portion of the tube on the distal side of the flange such that the proximal end of the tube is up to or close to the proximal surface. Fitting from a surface into the central bore and welding the tube to the flange by providing a weld in the at least one welding well.

  In one embodiment of the method, the end portion of the tube is press fit into the main portion of the central hole.

  In one embodiment of the method, the central hole is further provided with a conical portion that opens to the distal face of the flange, and the tube is provided with a corresponding mating zone. The method includes the further step wherein the mating zone is an interference fit with the conical portion of the central hole.

  In one embodiment of the method, the distal surface of the flange is formed on a protrusion extending distally from the flange body, and the distal surface is around the protrusion. A shelf is formed. The method further includes press-fitting the outer tube into the protrusion such that the proximal end of the outer tube contacts the distally facing shelf.

  In one embodiment, the outer tube has a proximal end and a conical portion formed at the proximal end, the conical portion, and the shelf facing the distal side of the flange, 2 welding recesses are formed. The method includes forming a second weld in the second welding recess to secure and connect the outer tube to the flange.

  The present invention also relates to a flange and tube assembly as in any of the embodiments described above, and to a flange and tube assembly manufactured as in any of the method embodiments described above.

  In a further aspect, the present invention relates to a crosshead large uniflow turbocharged two-cycle diesel engine. The engine comprises a plurality of cylinders arranged in a row and an element in the form of a gas distribution block provided at or near each cylinder, the gas distribution block connected to a nearby gas distribution block Connected to each other by a high pressure conduit that is formed with a flange and tube assembly according to any one of the flange and tube assembly embodiments described above.

  In a further aspect, the present invention relates to a crosshead large uniflow turbocharged two-cycle diesel engine. The engine comprises a plurality of cylinders arranged in a row and an element in the form of a gas distribution block provided at or near each cylinder, the gas distribution block connected to a nearby gas distribution block Connected to each other by a high pressure conduit, the end portions of the high pressure conduit extending substantially downward from the gas distribution block, and the portion of the gas pipe between the end portions having a continuous curve. In one embodiment, the curve is a reverse arc.

  In certain embodiments of a crosshead large low speed uniflow turbocharged two-stroke diesel engine, the high pressure conduit includes a flange and tube assembly according to any one of the embodiments described above.

The purpose, features, advantages and characteristics of the flanges, flanges and pipe connections and methods according to the present invention will become clear from the detailed description.

In the following detailed part of the specification, the invention will be described in more detail with reference to the exemplary embodiments shown in the drawings.
1 is a diagram schematically showing a large two-stroke diesel engine as seen from the front of a crosshead. FIG. FIG. 2 is a side view of the large two-stroke engine of FIG. 1. FIG. 2 is a diagrammatic drawing of the components of a large two-stroke diesel engine, showing the crosshead viewed from the side, showing the arrangement of high pressure conduits for the LNG fuel supply system in one embodiment of the present invention. FIG. 4 is a front view of the large two-stroke engine of FIG. 3. It is a side view which shows the detail of arrangement | positioning of the high voltage | pressure conduit | pipe for an LNG fuel supply system. It is a front view which shows the detail of arrangement | positioning of the high voltage | pressure conduit | pipe for an LNG fuel supply system. FIG. 3 is a side view of a flange for a high pressure conduit according to an embodiment of the present invention. FIG. 6 is a bottom view of a flange for a high pressure conduit according to an embodiment of the present invention. FIG. 3 is a side cross-sectional view of a flange for a high pressure conduit according to an embodiment of the present invention. FIG. 7C is a detailed view of the circle shown in FIG. 7C of a flange for a high pressure conduit according to an embodiment of the present invention. It is a figure which shows the end of the high voltage | pressure conduit | pipe according to embodiment of this invention in the middle of an assembly. FIG. 8B is an illustration of one end of a high pressure conduit according to an embodiment of the present invention during assembly and at a different stage from FIG. 8A. FIG. 9 shows a pipe for the high pressure conduit shown in FIGS. FIG. 6 shows one end of a high pressure conduit according to another embodiment of the present invention. FIG. 2 shows one end of a high-pressure conduit according to an embodiment of the invention with a connecting element.

Detailed Description of the Preferred Embodiment

  In the detailed description below, a high pressure conduit for a large two-cycle engine is described by way of an exemplary embodiment. 1 and 2 show a large low speed turbocharged two-cycle diesel engine 10 having a crankshaft and a crosshead. FIG. 1 is a diagram showing an outline of a large-sized low-speed turbocharged two-cycle diesel engine having an intake system and an exhaust system. The engine of this exemplary embodiment has six cylinders 1 in series. A large turbocharged two-cycle diesel engine typically has 5 to 16 cylinders 1 in series and is carried by a cylinder frame 42. The cylinder frame 42 is carried on the engine frame 45. The engine 10 may be used, for example, as a main engine of an ocean-going ship or as a stationary engine for operating a power plant generator. The total output of the engine may be in the range of 5,000 to 110,000 kW, for example.

  The engine 10 is a two-cycle uniflow type having a scavenging port (not shown) in the lower region of the cylinder 1 and an exhaust valve 4 in the upper portion of the cylinder 1. The air supply flows from the air supply receiver 2 (also referred to as an air supply reservoir) to the scavenging ports of the individual cylinders 1. A piston (not shown) in the cylinder 1 compresses the supply air, fuel is injected, combustion continues, and exhaust gas is generated. When the exhaust valve 4 is opened, the exhaust gas flows through an exhaust duct (not shown) associated with the cylinder 1 of interest into the exhaust receiver 3 and through the first exhaust conduit 33. 5 to which the exhaust gas flows through a second exhaust conduit (not shown). The turbine drives a compressor (not shown) via a shaft (not shown). The compressor pressurizes the supply air supplied via the intake port (not shown) and sends it to the supply conduit (not shown) leading to the intake receiver 2.

  The intake air in the supply conduit passes through an intercooler (not shown) for cooling the supply air (exiting the compressor at about 200 ° C.) to a temperature of 36 ° C. to 80 ° C.

  In the low load or partial load state, the cooled supply air advances to the supply air receiver 2 through the auxiliary blower 43 for pressurizing the supply air flow. The auxiliary blower 43 is driven by an electric motor. The auxiliary blower 43 is bypassed by a check valve (not shown) because the compressor of the turbocharger 5 can deliver a sufficiently compressed scavenge at high loads.

  Referring now to FIGS. 3 and 4, there are shown a side view and a front view of the top of the engine 10 similar to that shown in FIGS. 1 and 2, respectively. In FIGS. 4 and 5, many engine parts are omitted to show details of the fuel supply system utilizing the high pressure conduit 50 according to the present invention. The figure shows a cylinder frame 42 with seven cylinders 1, each cylinder having an exhaust valve 4 on which an exhaust valve actuator is mounted. The exhaust valve 4 is mounted on the upper plate 6 of the cylinder 1. The distribution block 130 is attached on the upper plate 6 in connection with each cylinder. In this case, the distribution block 130 is in the form of a gas, such as liquefied natural gas (LNG), for distributing fuel to the combustion chamber of the engine through the top plate 6 or through the top of the cylinder 1, for example through an injection valve. used. Similar distribution blocks connected to each cylinder or pair of cylinders may be used in connection with the supply of heavy oil or high pressure hydraulic oil for exhaust valves, engine lubrication valves and the like. In such a case, the distribution block may be arranged at other positions of the engine rather than on the top plate 6.

  The distribution block 130 is connected via a high-pressure conduit 50 according to the present invention. In conventional engines, the high pressure conduits are formed by straight pipes that extend between the distribution blocks 130 or between connection blocks (not shown) having conduits that branch into the distribution block. 3 and 4, two high pressure conduits 50 are between each pair of adjacent distribution blocks 130. On the right side of FIG. 3, two high pressure conduits 50 'are shown. These high pressure conduits 50 'may be connected to a fuel supply system (not shown).

  The structure and operation of a crosshead large two-stroke engine is well known and need not be described further.

  Referring now to FIG. 8A, this figure shows a first exemplary embodiment of one end of a flange and tube assembly 51, preferably for the high pressure conduit 50, which is an LNG fuel gas. It is particularly suitable for supplying a high-pressure fluid such as heavy oil or a high-pressure valve working fluid to an injection valve or other hydraulic valve of the large two-cycle diesel engine 10.

  As can be seen from FIG. 3, each high pressure conduit 50 has two end portions 52 and 53 and a central portion section 54 (see, eg, FIG. 3). Each high pressure conduit 50 includes at least one tube 80 for allowing fluid to pass between the tube and two other elements, and a flange 60 formed at each end of the tube. These other elements may be valves, such as fuel injection valves or exhaust valves, or gas distribution blocks 130 for engines operating with gas (see the description below in connection with FIGS. 3-6). More generally a fuel distribution block or high pressure fluid distribution block, or other high pressure conduit 50. Furthermore, the high-pressure conduit 50 may connect various elements, such as a distribution block at one end and a valve at the other end. In other embodiments (not shown), the flange 60 may be formed at one end of the high pressure conduit and another type of connection to the element may be formed at the other end.

  In FIG. 8A, one flange and tube assembly 51 at the end of the high pressure conduit 50 is shown. The flange and tube assembly 51 includes a flange 60 and a tube 80.

  The flange 60 includes a flange body 61. The flange body 61 has a proximal surface 62 configured for attachment to another element and an opposing distal surface 63.

  The central hole 70 is provided in the flange body 61. The central hole 70 has a size and shape suitable for receiving and supporting the end portion 81 of the tube 80 so that the tube can be fixedly connected to the flange 60. Preferably, the cross-sectional shapes of the central hole 70 and the tube 80 are circular. The central hole 70 opens in the proximal surface 62 as well as the distal surface 63 of the flange body 61. That is, the central hole passes through the flange 60.

  In one embodiment, the tube 80 may be a straight cylindrical tube (not shown) or a main section having a first diameter and a reduced diameter end section 81 at the proximal end 81 ′ of the tube 80. 82 may be included. A mating zone 84 having a conical shape is formed between the end section 81 and the main section 82. In either embodiment, the diameter or cross-sectional shape of the tube 80 or reduced diameter end section 81 is preferably slightly larger than the corresponding portion of the central hole 70, and thus a rigid and permanent connection therebetween. In order to provide the tube 80, the tube 80 must be pressed into the hole 70 of the flange 60. It is desirable that at least the tube and the hole form an interference fit.

  The central hole 70 comprises a main section 72 in the embodiment shown. The main section 72 has a cross-sectional shape and size that corresponds to the cross-sectional shape and size of the end portion 81 of the tube 80. The central bore 70 further has a conical portion 74 that opens into the distal face 63 of the flange body 61. The conical portion 74 is configured to correspond to a mating zone 84 on the tube 80. The conical portion 74 may be recognized in the detailed view of FIG. 7D. Thereby, an interference fit between the tube 80 and the central hole 70 of the flange 60 at the distal face 63 of the flange may be achieved. The conical portion 74 can also serve as a guide for inserting the tube 80 into the central bore 70 during manufacture. In other embodiments (not shown), the conical portion 74 may be omitted.

  In FIG. 9, an embodiment is shown in which the tube has a reduced diameter end section 81 and the hole 70 has a corresponding shape. In another embodiment (not shown), the tube 80 is a straight tube and the hole 70 forms a straight cylinder. In still other embodiments, the hole 70 may be formed, for example, as shown in FIG. 9, with the tube 80 having a right cylindrical shape before being press-fitted and after being pressed into the hole 70. It can take the shape as shown at 9.

  As shown in FIGS. 7C and 8A-8B, the welding recess 71 may be provided as a portion 71 ′ of the central hole 70 having an enlarged diameter relative to the main section 72. The welding recess 71 opens in the surface 62 on the proximal side of the main body 61 of the flange 60. Accordingly, the welding recess 71 provided by the enlarged diameter portion 71 ′ of the central hole 70 is configured to provide a space for the weld 100 between the end portion 81 of the tube 80 and the flange 60.

  In other embodiments (not shown), the welding recess 71 may be provided as a number of enlarged discontinuities or recesses disposed around the outer periphery of the central hole 70. Here, each of the discontinuous recesses is opened to the surface 62 on the proximal side of the main body portion 61 of the flange 60. Thus, there may be more than one welding recess 71 configured to provide multiple spaces for the weld 100 between the end portion 81 of the tube 80 and the flange 60.

  Thereby, a fixed or permanent connection between the tube 80 and the flange 60 may be provided from the proximal face 62 of the flange, in situations where the high pressure conduit is formed in a confined space, This is a great advantage, especially in situations where the high pressure conduit has a second outer tube (see below).

  The weld is preferably provided between the proximal end 81 ′ of the end portion 81 of the tube 80 and the recess 71 ′ at or near the proximal face 62 of the flange 60.

  In embodiments where the flange and tube assembly 51 is also provided with an interference fit between the tube 80 and the central hole 70 (conical portions 74 and 84), a particularly stable and rigid connection between the tube 80 and the flange 60 is provided. As a result, the weld 100 closes one proximal end of the central hole 70 and the conical portions 74 and 84 close the other (distal) end of the central hole 70.

  The distal surface 63, ie, the end surface of the flange 60, is preferably formed on a protrusion 64 that extends distally from the flange body 61. The protrusion 64 has a peripheral side wall 64 ′. A shelf 65 facing in the distal direction is formed around the protrusion 64. As can be seen from FIG. 8B, the distally facing ledge 65 and protrusion 64 are configured for connection to the outer tube 90.

  The tube 80 may be referred to as an inner tube.

  The outer tube 90 may be connected to the protruding portion 64 by press-fitting connection. The outer tube 90 has a proximal end 91, and in one embodiment, the proximal end 91 may be contacted with a shelf 65 facing the distal side (not shown). In one embodiment (not shown), a connection between the outer tube and the flange 60 may be provided between the proximal end 91 and the distally facing ledge 65. In other embodiments, as shown in FIG. 8B, proximal end 91 does not contact distally facing ledge 65. In one embodiment (not shown), the weld is formed between the proximal end 91 of the outer tube 90, the ledge 65 facing the distal side, and the peripheral side wall 64 ′ of the protrusion 64. May be.

  In certain embodiments, the outer tube 90 has a conical portion 92 formed at the proximal end 91. Thereby, when the outer tube is fitted over the projection 64, the second welding recess 91 ′ has a conical portion 92, a shelf 65 facing the distal side of the flange 60, and the projection And 64 peripheral side walls 64 '. As can be seen from FIG. 8B, the second welding recess 91 ′ includes the proximal end 91 of the outer tube 90, the shelf 65 facing the distal side, and the peripheral side wall 64 of the protrusion 64 of the flange 60. And is configured to provide space for the weld 110. Even in embodiments where the proximal end 91 is abutted against the distally facing ledge 65, the conical portion 92 also ensures that a second welding recess 91 'is formed, This will provide sufficient space for the weld 110 to ensure a stable, durable and complete pressure resistant connection between the outer tube 90 and the flange 60.

  An intermediate space 140 is formed between the tube 80 and the outer tube 90. When tube 80 ruptures, outer tube 90 acts as a backup barrier against leakage of high pressure fluid flowing through or contained within tube 80 and is formed between tube 80 and outer tube 90. The intermediate space 140 provides a backup container for the high pressure fluid leaking from the tube 80. The intermediate space 140 is a sensor (not shown) for detecting leakage from the tube 80, or a sensor for providing general information regarding the state of the high pressure conduit 50, such as pressure, temperature, conductivity, etc. (Not shown). A sensor (not shown) may communicate wirelessly with a control unit (not shown). Alternatively, such a sensor (not shown) may communicate with a control unit (not shown) via at least one second hole (see below) formed through the flange 60. . While the leak is contained, the high pressure conduit 50 may be prepared for repair so that it can be repaired most easily.

  In a further embodiment, at least one second hole 75, i.e. a through opening, is provided through the flange body 61. Accordingly, the second hole 75 opens in the proximal surface 62 and the distal surface 63. At least one second hole 75 is provided to pass through the body portion 61 of the flange 60 between the central hole 70 and the outer periphery 66 of the flange 60. Preferably, a plurality of second holes 75 are disposed in, ie through, the body portion 61 of the flange 60 between the central hole 70 and the outer periphery 66 of the flange 60 and thus surround the central hole 70. .

  At least one second hole 75 is provided to allow flow between the intermediate space 140 and at least a portion of the element to which the high pressure conduit 50 is connected. Accordingly, the flow path provided by the at least one second hole 75 may be provided to provide a connection, for example a wire connection, to a sensor provided in the intermediate space 140. Alternatively, one or more sensors may be provided in the element to which the high pressure conduit 50 is connected, and at least one second hole 75, for example, allows to detect leaks therethrough. .

  The at least one second hole 75 may alternatively or additionally allow control of the state of the intermediate space 140. Such control may involve ventilation, cooling, or heating of the intermediate space 140 via ventilation, cooling, or heating means provided to the element to which the high pressure conduit 50 is connected.

  Thus, FIGS. 8A and 8B show different embodiments of the flange and tube connection 51 and of the high pressure conduit 50. In one embodiment, there is only one tube 80. In other embodiments, there are two tubes, an (inner) tube 80 and an outer tube 90, which are formed concentrically so as to overlap each other. However, FIGS. 8A and 8B also show two stages in manufacturing the flange and pipe connection 51 and the high pressure conduit 50. In FIG. 8A, the tube 80 is fitted into the central hole, preferably by press fitting. The welding recess 71 formed between the enlarged diameter portion 71 ′ of the central hole 70 and the outer surface of the proximal portion 81 of the tube 80 does not yet have any welds. In FIG. 8B, the welded portion 100 is formed in a welding recess 71. Further, the outer tube is fitted over the protrusion 64 so that a second welding recess is formed and the second weld 110 is formed in the second welding recess. Yes.

  The flange and tube combination 51 shown in FIG. 10 may be provided with an outer tube 90 in some embodiments, similar to that described above.

  In the above, how the fixed connection between the (inner) tube 80 and the flange 60 is provided by the weld 100 formed in the welding recess 71, and the welding recess 71 is It has been described where it is formed as the enlarged diameter portion 71 ′ of the central hole 70 provided in the flange 60.

  However, in another embodiment, as shown in FIG. 10, the welding recess 71 is alternatively formed by a recess at the proximal end 81 ′ of the end portion 81 of the tube 80. This depression is provided by the conical portion 85 of the tube 80 at the proximal end 81 ′ of the end portion 81 of the tube 80.

  Alternatively (not shown), the welding recess 71 may be partially formed at the proximal end 81 ′ of the end portion 81 of the tube 80 by the central hole 70 and the enlarged diameter portion 71 ′ of the conical portion 85. .

  More generally, a welding recess 71 may be provided on the flange proximal surface 62 between the proximal end 81 ′ of the end portion 81 of the tube 80 and the flange 60.

  Thus, the proximal end 81 ′ of the tube 80 extends to the proximal surface 62 (the proximal end 81 ′ is flush with the end surface provided by the proximal surface 62), The high pressure fluid conduit 50 may be provided by a method in which the end portion 81 of the tube 80 is fitted from the distal face 63 of the flange 60 into the central hole 70 of the flange 60. Alternatively, the proximal end 81 ′ of the tube 80 extends to a position close to the surface provided by the proximal face 62. Preferably, the proximal end 81 ′ of the tube 80 extends slightly above or near the surface provided by the proximal face 62.

  In a further step, the tube 80 is welded to the flange by providing a weld 100 in the welding well 71 as described above.

  Preferably, any excess welding material and / or the proximal end 81 ′ of the tube 80 extending from the proximal face 62 is ground to the surface (the proximal end 81 ′ of the tube 80 and the proximal side of the flange). The surface 62) is polished. This is easy due to the arrangement of the welding recess 71.

  In an embodiment of the manufacturing process, the end portion 81 of the tube 80 is press fit into the main portion 72 of the hole 70 prior to the welding process.

  In further embodiments of the manufacturing process, when a conical portion 74 that opens into the distal face 63 of the flange is further provided in the central bore 70 and when a corresponding mating zone 84 is provided in the tube 80, The mating zone 84 is an interference fit with the conical portion 73 of the central hole 70 prior to the welding process.

  In an embodiment of the manufacturing process, the outer tube 90 is press-fitted so as to cover the protrusion 64 on the flange. The proximal end 91 of the outer tube 90 may be brought into contact with the shelf 65 facing the distal side.

  In some embodiments of the manufacturing process, the outer tube 90 is welded to the flange 60. A second weld 110 may be formed in the second weld recess 91 ′.

  Conventionally, it has been necessary to weld one pipe from the distal side of the flange, which is difficult in a narrow space of a ship. In contrast, the embodiment of the manufacturing method described above allows for simplified manufacturing. Furthermore, the method described above provides a much more stable, durable, and robust connection. In the case / embodiment where the outer tube is provided to cover the inner tube, the flange, assembly, and method according to the present invention allows the inner tube to be welded to the proximal side of the flange while the outer tube Can be welded to the flange from the distal side. This provides a very simple production of high-pressure conduits in the field, for example on ships, and it is very easy to prevent welding waste and weld spatter on the inside of either tube.

  The flange and tube assembly forms part of the high pressure conduit. The high pressure conduit is connectable to the other element 150, such as the gas distribution block 130 or another high pressure conduit. Connection is provided via flange 60 and corresponding and cooperating connecting means 151 provided to other elements 150. An example of such a connection is shown in FIG. A sealing element 250 may be provided between the flange 60 and the corresponding and cooperating connecting means 151 provided to the other element 150. In the embodiment shown, the sealing element 250 is a ring element having a flange 251 in the same plane as the proximal end face 62 and two annular projections 252, 253 projecting from opposite sides of the flange 251. Each of the annular protrusions 252 and 253 has a conical outer surface. One annular protrusion 252 is disposed to correspond to the mouth 171 of the passage 170 in the other element 150, which is provided by the tube 80 when the high pressure conduit is connected to the other element. Forming an extension of the passage. The other annular protrusion 253 is disposed to correspond to the mouth formed by the proximal end 81 ′ of the tube 80. Alternatively or additionally, an O-ring may be provided between the proximal end face 62 of the flange 60 and the end face 162 of the corresponding and cooperating connecting means 151 on the other element 150. In an embodiment (not shown), an annular groove is provided in the proximal end face 62 of the flange 60 and / or in the end face 162 of the corresponding and cooperating connecting means 151 on the other element 150. Alternatively, the annular groove is adapted to receive and guide an O-ring.

  The corresponding and cooperating connecting means 151 and flange 60 on the other element 150 are connected (not shown) by being pressed intimately by the compression means. Such means are provided, for example, by a flange that connects to the flange 60 at an annular groove 260 in the outer wall of the flange body. A similar annular groove 260 ′ may be provided on the outer surface of the connecting means 151 on the other element 150, as shown in FIG. Alternatively (not shown) the corresponding and cooperating connecting means 151 on the flange 60 and the other element 150 may be pressed together by screws, bolts or similar connecting means. These means are provided, for example, on the outer wall of the body 61 of the flange 60 and on a flange extending radially around the connecting means 151 on the other element 150 or through the body 61 of the flange and the other Provided in a suitable mating hole provided through connecting means 151 on the element 150 (not shown).

  The sealing element 250 shown in FIG. 11 is of a type that deforms to provide a seal when pressed between two parts, ie between the flange 60 and the connecting means 151 on the other element 150. There may be.

  3 and 4 illustrate a further aspect of the present invention. FIG. 3, which is a side view, shows the parts of the engine. FIG. 4, which is a front view, also shows parts of the engine 10. For the sake of brevity, these figures only show the most relevant parts of the engine 10. The embodiment of the method of manufacturing the flange 60, flange and tube assembly 51, and high pressure conduit shown in FIGS. 7-10 is suitable for application in a crosshead large low speed uniflow turbocharged two cycle diesel engine 10. It is. The engine 10 operates with a gas, such as liquefied natural gas (LNG), under high pressure.

  3 and 4 show a crosshead type large-scale low-speed uniflow turbocharged two-cycle diesel engine 10. The engine 10 includes a plurality of cylinders 1 arranged in series, and a gas distribution block 130 provided on or near each cylinder 1. The gas distribution blocks 130 are connected to each other by a high pressure conduit 50 that connects to a nearby gas distribution block 130.

  The engine fuel is gas. The gas must be provided to the engine at high pressure, for example, 100-500 bar, 200-400 bar, etc. The high pressure conduit must be rigid and securely connected to the other elements 150 to prevent leakage and rupture. The flange 60 and flange and tube assembly described above are particularly useful in providing such a robust high pressure conduit and connection.

  Each end portion 52 and 53 of the high pressure conduit 50 extends substantially downward from the gas distribution block 130. The portion 54 of the gas pipe between the two end portions 52 and 53 exhibits a continuous curve. Preferably, this continuous curve is a reverse arc. The high pressure conduit 50 preferably includes a flange 60 or flange and tube assembly 51 as described above. Preferably, the high pressure conduit 50 is of the type comprising an (inner) tube 80 and an outer tube 90.

  5 and 6 show detailed front and side views of the high pressure conduit 50 and distribution block 130. FIG.

  This provides a flexible way to interconnect the gas distribution block 130 to the cylinder 1 and thereby provides a supply of gas fuel to the cylinder. The “hanging” arrangement of the high-pressure conduit 50 is further influenced by the expansion and contraction of the machine parts in progress from the cold stage to the warm-up stage (when the engine is started), and from the operating engine. High-pressure conduits that are affected by vibrations of this have the advantage that they can very easily adapt to engine expansion / contraction due to temperature fluctuations. Furthermore, the “hanging” arrangement reduces engine vibration.

  The tube 80 and the outer tube 90 are preferably made of metal, such as steel, stainless steel or the like. They may be flexible and easy to bend.

  As a result, the present invention provides various types of possible designs and adaptations of any high pressure conduit for a large low speed turbocharged two-cycle diesel engine.

  Furthermore, since the flexibility and spatial requirements are not strict, the present invention may also be used with existing engines.

  Although the subject matter taught by the present application has been described for purposes of illustration, such details are merely for purposes of the present invention and changes therein by those skilled in the art without departing from the scope of the present teachings. It should be understood that may be added.

  In the context of this application, the term “proximal” should be construed as “proximal” to, ie proximal to, the element 150 to which the flange or flange and tube assembly is connected, eg, the distribution block 130. is there. Similarly, the term “distal” should be construed as “away from” the element 150 to which the flange or flange and tube assembly is connected, eg, the distribution block 130.

  The term “comprising”, when used in the claims, does not exclude other elements or steps. The singular terms in the claims do not exclude the plural. A single processor or other unit may fulfill the functions of several means recited in the claims.

Claims (12)

A flange (60) for connecting the inner tube (80) to another element (150),
A flange body (61) having a proximal surface (62) for attachment to said another element (150) and an opposing distal surface (63);
A central hole (70) in the flange body (61), with the inner tube (80) extending from the distal surface (63), the inner tube (80) being connected to the flange (60). ) And sized and shaped to receive and support the end portion (81) of the inner tube (80) so that it can be fixedly connected to the proximal surface (62) and the distal side A central hole (70) opening in the surface (63) of
At least one welding recess (71) provided as an enlarged portion of the central bore (70) and opening in the proximal face (62), the end portion (81) of the inner tube (80); ) And the flange (60), at least one welding recess (71) provided to provide a space for welding;
With
Here, the distal surface (63) is formed on a protrusion (64) extending distally from the flange body (61) and faces the distal side around the protrusion. A shelf (65) is formed, and the distal facing shelf (65) and the protrusion (64) extend from the distal surface (63) to extend the inner tube (80). Provided to connect to the surrounding outer tube (90);
The central hole (70) has a main section (72) whose cross section corresponds to the end portion (81) of the inner tube (80);
The central hole (70) further has a conical portion (74) that opens into the distal face (63) of the flange body (61);
The conical portion (74) is provided so as to correspond to the fitting zone (84) of the inner tube (80), and the fitting zone (84) has a conical shape corresponding to the conical portion (74). Have
Flange (60). The flange (60) according to claim 1, wherein the welding recess (71) is an annular enlarged portion (71 ') of the central hole (70). A flange and tube assembly (51) comprising a flange (60) and an inner tube (80) having an end portion (81), said flange (60) for attaching to another element (150) A flange body (61) having a proximal surface (62) and an opposing distal surface (63); and a central hole (70) in the flange body (61) A central surface (70) opening in the distal surface (62) and the distal surface (63);
The assembly (51) comprises an outer tube (90) surrounding the inner tube, and
The central hole (70) is used to fix and connect the inner tube (80) to the flange (60) in a state where the inner tube (80) protrudes from the distal surface (63). Sized and shaped to receive and support the end portion (81) of the inner tube (80),
The assembly further comprises at least one welding recess (71) provided between the end portion (81) of the inner tube (80) and the flange (60), the at least one welding A recess (71) opens into the proximal surface (62) of the flange, and the welding recess (71) connects the end portion (81) of the inner tube (80) and the flange (60). Configured to provide space for welding between and
The distal surface (63) of the flange (60) is formed on a protrusion (64) extending distally from the flange body (61) and around the protrusion (64). Is formed with a shelf (65) facing the distal side,
The distal facing ledge (65) and the protrusion (64) connect the outer tube (90) with the outer tube (90) extending from the distal surface (63). Provided to
The central hole (70) comprises a main section (72) having a cross section adapted to correspond to the end portion (81) of the inner tube (80), the central hole (70) further comprising: The flange body (61) has a conical portion (74) that opens to the distal surface (63), the conical portion (74) in the fitting zone (84) of the inner tube (80). Correspondingly, the mating zone (84) has a conical shape corresponding to the conical portion (74);
Flange and tube assembly (51).   The proximal end (81 ') of the end portion (81) is welded to the flange (60) at or near the proximal face (62) of the flange (60). A flange and tube assembly (51) according to claim 3. The flange and tube assembly ( 4 ) according to claim 4 , wherein the welding recess (71) is formed by a recess at the proximal end (81 ') of the end portion (81) of the inner tube (80). 51).   The flange and tube assembly (51) according to claim 3 or 4, wherein the at least one welding recess (71) is formed as an annular enlarged diameter portion (71 ') of the central hole (70). The welding recess (71) includes an enlarged diameter portion (71 ′) of the central hole (70) and a recess of the proximal end (81 ′) of the end portion (81) of the inner tube (80). 5. A flange and tube assembly (51) according to claim 4 formed between the two.   At least one second hole (75) passing through the flange body (61) is provided, the second hole (75) comprising the proximal surface (62) and the distal side of the flange. 8. Flange and tube assembly (51) according to any one of claims 3 to 7, which opens into a surface (63) of the flange.   The outer tube (90) has a proximal end (91) and a conical portion (92) formed at the proximal end (91), of the conical portion (92) and the flange (60). The distally facing ledge (65) forms a second welding recess (91 '), which is located near the outer tube (90). The flange and tube assembly (51) of claim 8, configured to provide a space for a weld (110) between a distal end (91) and the flange (60). A method for manufacturing a high-pressure conduit (50), comprising:
The high pressure conduit comprises a flange and tube assembly (51) comprising a flange (60) and an inner tube (80) having an end portion (81) and an outer tube (90) surrounding the inner tube (80). The flange body (61) has a proximal surface (62) for attachment to another element (150) and an opposing distal surface (63). A central hole (70) in the flange body (61) having a central hole (70) opening in the proximal face (62) and the distal face (63). And
The central bore (70) is sized and formed to receive and support the end portion (81) of the inner tube (80) that is fixedly connectable to the flange (60);
At least one welding recess (71) is provided between the end portion (81) of the inner tube (80) and the flange (60), the welding recess (71) being located on the flange of the flange (60). Opening into the proximal face (62);
The distal surface (63) of the flange (60) is formed on a protrusion (64) extending distally from the flange body (61) and around the protrusion (64). Is formed with a ledge (65) facing the distal side, and the ledge (65) and the protrusion (64) facing the distal side are arranged so that the outer tube (90) is located on the distal side. Provided to connect the outer tube (90 ) in a state protruding from the surface (63),
The method
Of the inner tube (80) such that the proximal end (81 ′) of the inner tube (80) is up to or close to the proximal surface (62). Fitting the end portion (81) from the distal face (63) of the flange (60) into the central hole (70);
Welding the inner tube (80) to the flange by providing a weld (100) in each of the at least one welding recess (71);
Press fitting the outer tube (90) into the protrusion (64) so that the proximal end (91) of the outer tube (90) contacts the shelf (65) facing the distal side;
Including
Here, the central hole (70) is provided with a main section (72) having a cross section adapted to correspond to the end portion (81) of the inner tube (80), and the central hole (70) 70) is further provided with a conical portion (74) that opens into the distal surface (63) of the flange body (61), the conical portion (74) being fitted into the inner tube (80). The mating zone (84) is adapted to have a conical shape corresponding to the conical portion (74).
Method. The fitting zone (84), said provoking interference fit with the conical part (7 4) of said central hole (70), The method of claim 10.   The outer tube (90) has a proximal end (91) and a conical portion (92) formed at the proximal end (91), the conical portion (92), and the flange (60). The distally facing shelf (65) forms a second welding recess (91 '), and the second weld (110) connects the outer tube (90) to the flange (60). The method according to claim 11, wherein the method is formed in the second welding recess (91 ′) so as to be fixed and connected to the device.

Images