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20 条记录 (耗时 0.02 秒)

    FUEL SUPPLY SYSTEM WITH PUMP WITH IMPROVED SEALING PROPERTIES
    1.
    发明公开
    FUEL SUPPLY SYSTEM WITH PUMP WITH IMPROVED SEALING PROPERTIES 审中-公开

    公开(公告)号：EP4043718A1

    公开(公告)日：2022-08-17

    申请号：EP22165009.6

    申请日：2021-02-25

    申请人： MAN Energy Solutions, filial af MAN Energy Solutions SE, Tyskland

    发明人： Hagen, Peter

    IPC分类号： F02M59/10

    摘要： A fuel supply system comprising a fuel pump (40) for pumping a gaseous fuel to a fuel valve, a source for pressurized fuel (60) and a source of pressurized sealing liquid (57). The fuel pump has a housing with a first bore (84) and a second bore (81). A hydraulically driven actuation piston (83) is slidably received in the first bore (84) and configured to be movable between a retracted position and an extended position. A drive plunger (80) is operably connected to the actuation piston (83) to move in unison with the actuation piston (83). The drive plunger (80) is slidably received with a first clearance (91) in the second bore (81). A pump plunger (87) is slidably received with a second clearance (92) in the second bore (81) and configured to be movable between a retracted position and an extended position. A sealing liquid chamber (86) is arranged in the second bore (81) between a distal side of the drive plunger (80) and a proximal side of the pump plunger (87). A sealing liquid port (70) is connected to the source of pressurized sealing liquid (57), a sealing liquid supply channel (93) fluidically connects the sealing liquid chamber (86) to the sealing liquid supply port (70) when the actuation piston (83) in its retracted position.A pump chamber (82) is arranged in the second bore (81) on a distal side of the pump plunger (87) . A fuel inlet port is connected to the source of pressurized fuel (60), and a fuel supply channel connecting the fuel inlet port to the pump chamber (82).

    PISTON RING FOR A LARGE TWO-STROKE TURBO-CHARGED UNIFLOW-SCAVENGED CROSSHEAD INTERNAL COMBUSTION ENGINE
    2.
    发明公开
    PISTON RING FOR A LARGE TWO-STROKE TURBO-CHARGED UNIFLOW-SCAVENGED CROSSHEAD INTERNAL COMBUSTION ENGINE 审中-公开

    公开(公告)号：EP4239227A1

    公开(公告)日：2023-09-06

    申请号：EP23157754.5

    申请日：2023-02-21

    申请人： MAN Energy Solutions, filial af MAN Energy Solutions SE, Tyskland

    发明人： Samuelsson, Per Erik ,  Andersson, Henrik ,  Fogh, Jesper Weiss

    IPC分类号： F16J9/14 ,  F16J9/20

    摘要： A piston ring (4, 6) for use in a piston ring pack in an annular ring groove (3) in the sidewall of a piston (1) of a large two-stroke turbo-charged uniflow-scavenged crosshead internal combustion engine to seal against the pressure in a combustion chamber (2) above the piston (1), the piston ring (4, 6) having a ring body (11), a diameter (22), a height (21), an upper ring surface (22), a lower ring surface (23), an outer ring surface (12) and an inner ring surface (24), which outer ring surface (12) during operation of the engine slides against an inner side of a cylinder liner (7), and first- and second engaging end portions (8, 9) at a ring partition (10) that allows expansion and contraction of the piston ring (4, 6), where the first engaging end portion (8) comprises a circumferentially extending finger (13) and the second engaging end portion (9) comprises an circumferentially extending recess (14) shaped and sized for displaceably receiving the finger (13), where a gap area (15) is provided at the end of the finger (13), in which gap area (15) only the end portion (9) with the recess (14) constitutes part of the outer ring surface (12) sliding against the cylinder liner (7). The outer ring surface (12) of the piston ring (4, 6) at least in said ring section (10), as seen in cross section, is convex and part of a imaginary circle having a center (20) and a radius of curvature (25) of a least 0,8 times, preferably at least 1 times the diameter of the piston ring (4, 6). Hence, it will be possible to obtain an effective sealing in the gap area (15), where problems related to coating damages and blow by of combustions gases from the combustion chamber (2) above the piston (1) are avoided. By providing the ring section (10) with an outer surface (12) as defined above it is ensured that the sliding surface (12) of the piston ring (4, 6) which provides the sealing effect also includes a sufficient part of the end portion (9) with the recess (14) in the gap area (15) to ensure a proper sealing effect also in this gap area (15).

    PISTON RING WITH HARD COATING
    3.
    发明公开
    PISTON RING WITH HARD COATING 审中-公开

    公开(公告)号：EP3933232A1

    公开(公告)日：2022-01-05

    申请号：EP21177973.1

    申请日：2021-06-07

    申请人： MAN Energy Solutions, filial af MAN Energy Solutions SE, Tyskland

    发明人： Fogh, Jesper Weiss

    IPC分类号： F16J9/26

    摘要： A piston ring (34,36) for use in a piston ring pack in an annular ring groove (33) in the sidewall of a piston (10) of a large two-stroke turbocharged uniflow-scavenged internal combustion engine with crossheads to seal against the pressure in the combustion chamber (32). The piston ring (34,36) comprises a ring body (50) with first- and second side faces (46,47) axially distanced by a ring height (Hr), an outer circumferential face (41) extending axially over the ring height (Hr), an inner circumferential face (42), and first- and second end portions (38,39) at a ring partition that allows expansion and contraction of the piston ring (34,36). A first transition between the outer circumferential face (41) and the first side face (46) is rounded, a second transition between the outer circumferential face (41) and the second side face (47) is rounded. A medial portion of the axial extent of the outer circumferential face (41) has a first hardness. A first peripheral portion of the axial extent of the outer circumferential face (41) that extends from the medial portion to the first transition has a second hardness. A second peripheral portion of the extent of the outer circumferential face (41) that extends from the medial portion to the second transition has the second hardness, and the first hardness is greater than the second hardness. Said first peripheral portion extends axially over a first height (HI) and is formed by material of the ring body (50), and said second peripheral portion extends axially over a second height (H2) and is formed by material of the ring body (50).

    FUEL PUMP WITH IMPROVED SEALING PROPERTIES
    4.
    发明公开
    FUEL PUMP WITH IMPROVED SEALING PROPERTIES 审中-公开

    公开(公告)号：EP3872331A1

    公开(公告)日：2021-09-01

    申请号：EP21159312.4

    申请日：2021-02-25

    申请人： MAN Energy Solutions, filial af MAN Energy Solutions SE, Tyskland

    发明人： Hagen, Peter

    IPC分类号： F02M57/02

    摘要： A fuel pump for pumping fuel to a fuel valve. The fuel pump has a housing with a first bore (84) and a second bore (81). A hydraulically driven actuation piston (83) is slidably received in the first bore (84) and configured to be movable between a retracted position and an extended position. A drive plunger (80) is operably connected to the actuation piston (83) to move in unison with the actuation piston (83). The drive plunger (80) is slidably received with a first clearance (91) in the second bore (81). A pump plunger (87) is slidably received with a second clearance (92) in the second bore (81) and configured to be movable between a retracted position and an extended position. A sealing liquid chamber (86) is arranged in the second bore (81) between a distal side of the drive plunger (80) and a proximal side of the pump plunger (87). A pump chamber (82) is arranged in the second bore (81) on a distal side of the pump plunger (87).