JP5715354B2 - High voltage connection and connection configuration - Google Patents

Description

  The invention relates to a high-pressure connection having a pressure reservoir and a connection configuration according to the preamble of the independent claims of the respective categories. Furthermore, the invention relates to a large diesel engine having such a high pressure connection and / or such a connection configuration.

  In devices where fluids, in particular liquids, must be guided under high pressure, connections are required between the individual components that must withstand high pressure and must also be leak-proof. By way of example, here it can be made as a two-cycle engine or a four-cycle engine, and is frequently used as a marine drive, or for example to drive a large generator for the generation of electrical energy A large diesel engine, which is also used in stationary operation, must be mentioned.

  Modern large diesel engines specifically have two media that are transported under extremely high pressures, which on the one hand are fuels that are transported to the injection nozzle at pressures higher than 1000 bar. On the other hand, it is typically a hydraulic medium called servo oil. The hydraulic medium works, for example, for hydraulic actuation of the exhaust valve. These media are conveyed by a pump into a pressure reservoir, which is made as a pressure pipe and extends along the entire cylinder area. From these pressure reservoirs (also called pressure accumulators), the medium moves to the injection member or to the control and / or operating device for the hydraulic components.

  The connection between a pressure reservoir requiring a medium and the device is often based on a screw connection, in which case the device is screwed onto the wall of the pressure reservoir or into the corresponding outlet hole of the pressure reservoir. It is screwed directly onto a high-pressure line that is pressed sealingly through a mountain. Welding or brazing is also known.

  It is an object of the present invention to provide a high pressure connection that can carry pressurized liquid from a pressure reservoir to a device that is different in structure, structurally simple, and reliable. Furthermore, such a connection configuration must be provided. Specifically, the high pressure connection must be suitable for use in large diesel engines.

  The subject matter of the invention which fulfills these objectives is characterized by the function of the respective independent claims.

  Thus, according to the present invention there is provided a high pressure connection for connecting a device operated with pressurized fluid to a pressure reservoir for fluid, the pressure reservoir being at least one opening in the seating surface The high pressure connection includes a body extending in a longitudinal direction from the first end surface to the second end surface, the first end surface configured to cooperate sealingly with the seating surface. And having an inlet opening, the second end face is configured to be received by the device and has an outlet opening connected to the inlet opening via a passage hole. The second end face has an active surface for the fluid that is larger than the active surface of the first end face.

  In this regard, an active surface means a vertical projection of each end face on a plane that lies perpendicular to the longitudinal axis, that is, a surface that is decisive for the force acting on the end face because of the fluid To do. The active surface for the second end face is larger than the active surface for the first end face, but the pressure applied by the fluid is essentially the same on both end faces so that the high pressure connection is at its first end. Due to the fluid in the operating state, a greater force acts on the second end face than it does on the first end face so that it is pushed sealingly into the seating surface at the end face. Therefore, a leak-free connection at high pressure sealed with pressurized fluid can be realized. In principle, no screw or welding is required for this sealing function.

  Preferably, the first end face is made as a conical surface or a truncated conical surface. With this geometry of the first end face, a particularly good connection can be achieved at the connection with the pressure reservoir.

  Advantageously, the second end face is made as a circular surface. On the one hand, this is structurally simple and maximizes the active surface of the second end face with a predetermined diameter of the second end face.

  And a pressure reservoir for the fluid to be pressurized, a device operated with the fluid, and a high pressure connection, wherein the fluid can reach the device from the pressure reservoir through the high pressure connection. The pressure storage tank has at least one connection hole that opens to the seating surface, and the high-pressure connection portion includes a main body extending in the direction of the longitudinal axis from the first end surface to the second end surface, An outlet opening configured to sealingly cooperate with the seating surface and having an inlet opening, the second end surface configured to be received by the device and connected to the inlet opening via a passage hole The high pressure connection is in contact with the seating surface at its first end and in contact with the device at its second end so that fluid can flow from the pressure reservoir through the passage hole of the high pressure connection into the device. . The second end face has an active surface for the fluid that is larger than the active surface of the first end face.

  The seal between the high pressure connection and the pressure reservoir is mainly achieved by the fluid pressure against the second end face in this connection configuration. Since the active surface is larger than the active surface of the first end surface, a force for sealingly pressing the first end surface against the sealing surface of the pressure storage tank is generated.

  In applications important for implementation, the pressure reservoir is made as a pressure pipe.

  It is structurally advantageous when the device is fastened laterally to the pressure reservoir with respect to the normal operating position. Thus, it can be avoided that pressure beats occurring in the operating state of the device, for example by opening, closing or switching of the valve, cause the introduction of force into the pressure line.

  A further advantageous means is provided when an attachment is provided, which surrounds the pressure reservoir and the high-pressure connection is attached to the attachment. Thereby, it can be avoided that the high pressure connection has to be bolted directly to the wall of the pressure reservoir.

  Advantageously, the second end face of the high-pressure connection is arranged in the hole of the device. Through this means it is possible for the fluid to apply a particularly good pressure to the second end face.

  Advantageously, the high pressure connection is received by the device without the use of threads so that the force is ideally transferred from the second end face to the first end face.

  In a preferred embodiment, the pressure reservoir is a pressure pipe for a hydraulic medium or fuel in a large diesel engine.

  Furthermore, a large diesel engine having a high-pressure connection according to the invention or having a connection configuration according to the invention is provided by the invention.

  Preferably, the pressure reservoir is a pressure pipe for a hydraulic medium or fuel for a large diesel engine, the pressure pipe is supported through the device, and the pressure pipe is fastened laterally to the device with respect to the normal operating position. . That is, it is achieved that pressure beats in the device are removed and transmitted into the support arrangement, and that they do not cause significant introduction of forces into the pressure pipe.

  A particularly relevant application in practice is when the device is a valve control device for hydraulic actuation of an exhaust valve.

  Further advantageous means and preferred embodiments of the invention result from the dependent claims.

  In the following, the present invention will be described in more detail with reference to embodiments and drawings. In the schematic drawing not drawn to scale, they are partially shown in cross section.

1 is a cross-sectional view showing a first embodiment of a connection configuration according to the present invention comprising an embodiment of a high-voltage connection according to the present invention. FIG. 3 is a schematic diagram showing an embodiment of a large diesel engine according to the present invention comprising a second embodiment of a connection configuration according to the present invention. It is sectional drawing which shows a 2nd embodiment along sectional line III-III of FIG.

  FIG. 1 shows in cross-section a first embodiment of a connection configuration according to the invention, the connection configuration generally comprising the reference numeral 10 and comprising an embodiment of a high-voltage connection according to the invention, The high-voltage connection is generally provided with reference numeral 1. In addition, the connection arrangement 10 comprises a pressure reservoir 2 for fluid and a device 3 which is only shown, which device is operated with the aid of pressurized fluid.

  The fluid may be any gaseous or liquid medium that can be utilized in a working process under pressure, such as hydraulic or servo oil for hydraulic operation or actuation of pistons, valves, or the like, internal combustion engines Fuel for injection into the (engine) cylinder, or water to be transported under pressure.

  The device 3 can be any desired device that can be operated with pressurized liquid, for example a control valve, a hydraulically operated piston, a pump, or a pressure line carrying the liquid.

  The pressure reservoir 2 can be made as a pipe-shaped, in particular cylindrical, pressure pipe with a cylinder axis L, like for example the pressure reservoir used in today's common rail systems. The pressure storage tank 2 includes a wall 21 and has a storage space 22 for pressurized liquid on the inner side. The pressure storage tank 2 includes at least one connection hole 23, and the connection hole 23 extends outward in the radial direction from the storage space 22 through the wall 21 and opens to the seating surface 24. The seating surface 24 is made conical.

  For the pipe-shaped pressure reservoir 2 of the common rail system, a plurality of connection holes 23 are typically provided, which are arranged behind one another with respect to the cylinder axis L according to the illustration (FIG. 1). The following description is limited to only one connection hole 23. Because it is enough for understanding.

  The high-pressure connection 1 includes a body 11 that extends from the first end surface 12 to the second end surface 13 along the longitudinal axis A. First end surface 12 is configured to cooperate sealingly with seating surface 24. In the following embodiments, the first end face 12 is made as a conical surface and / or a frustoconical surface. In this regard, the associated cone angle of the first end surface 12 may be as large as the cone angle associated with the seating surface 24, or may be a little smaller depending on the material.

  For better understanding, FIG. 1 shows the high-pressure connection 1 away from the pressure reservoir 2. In operation, it is understood that the high-pressure connection 1 is pushed into the seating surface 24 at its first end face 12 in order to achieve a high-pressure and leak-free connection between the pressure reservoir 2 and the high-pressure connection 1. Should be. If the cone angle of the first end surface 12 has a smaller size than the seating surface 24, the existing pressure causes the first end surface 12 to be deformed in the operating state and coincide with the seating surface 24.

  The first end face 12 has an inlet opening 14 through which fluid can flow from the storage space 22 of the pressure reservoir 2 into the high pressure connection 1. A centrally disposed passage hole 15 extends in the direction of the longitudinal axis A from the inlet opening 14 to the outlet opening 16, and the outlet opening 16 is provided in the second end face 13. The second end face 13 is made as a circular surface and / or a ring surface in this embodiment.

  The second end face 13 is configured to be received by the device 3. The device 3 has a cavity or hole 31 that is bounded by a wall 32 and receives the second end face 13. According to the illustration, the main body 11 of the high-pressure connection 1 has a groove below the second end face 13, the groove extends over the entire circumference, and the sealing element 17, for example an O-ring is in the groove. It is arranged and seals between the wall 32 and the main body 11.

  The first end surface 12 and the second end surface 13 each have an active surface. An effective surface is thereby intended, and the pressure acting on the respective end face 12, 13 can generate a force through the effective surface in the direction of the longitudinal axis, ie upwards or downwards according to the illustration. Therefore, the active surface is a protrusion in the orthogonal direction of each end face 12, 13 with respect to a plane located perpendicular to the longitudinal axis A. With respect to the first end face 12, the active surface is the same size as the cross-sectional surface at the position W1 indicated by the arrow in FIG. With respect to the second end face 13, the active surface is the same size as the second end face 13.

  According to the present invention, the active surface of the second end face 13 is larger than the active surface of the first end face 12.

  In the operating state, the pressurized fluid flows from the storage space 22 of the pressure reservoir 2 through the connection hole 23 and the passage hole 15 to a part of the hole 31 of the device 3 located above the second end face 13 according to the illustration. From there, the fluid can flow, for example, through the passage 33 so as to be available in the device 3.

  Due to the fluid, the second end face 13 has a pressure acting on the second end face which is essentially the same as the pressure present in the storage space 22. Since the second end face 13 has an active surface that is larger than the active surface of the first end face 12, it is directed downward in the direction of the longitudinal axis, according to the illustration, and the first end face is sealed against the seating surface. A pressing force is generated. Thus, a sealing function caused by fluid pressure can be achieved.

  In principle, there are no screw connections, and no other type of attachment is required for this sealing, for example by welding or brazing. However, for example to guide the high-pressure connection 1 in the direction of the longitudinal axis A, to avoid tilting the high-pressure connection, or to achieve a main seal, bolts or other attachment means Or it should be understood that additional guiding means may be provided. This is illustrated by the example according to the second embodiment.

  In the second embodiment, reference is made to a large diesel engine which is an important application to be implemented. In modern large diesel engines, fuel injection, gas exchange, and optionally water injection and auxiliary systems are operated by a common rail system. In this regard, each fluid, for example a fuel for injection, a hydraulic medium such as servo oil for the operation of the exhaust valve, or a working medium for the control of injection, uses a pump under high pressure, It is also transported into a pressure storage tank known as a pressure storage chamber. In that case, all cylinders of the internal combustion engine are provided with pressurized fluid from their respective accumulator chambers and / or valves, and the fuel injection device is controlled by the pressurized liquid. Typically, the pressure reservoirs are each made as a pipe-like component that is closed at both ends and extends along the engine at approximately the cylinder head level.

  In common rail systems, the highest pressure typically occurs due to fuel injection. Within the associated pressure reservoir, the pressure can reach, for example, up to 2000 bar. The pressure of the hydraulic medium (eg servo oil) can reach up to 300 bar in the pressure reservoir of the common rail system for the operation of the exhaust valve.

  In a partially schematic illustration, FIG. 2 shows a portion relevant to the understanding of the present invention of an embodiment of a large diesel engine according to the present invention, which is generally provided with the reference numeral 100. . Specifically, the present embodiment is a low-speed single-flow scavenging two-cycle large diesel engine 100 including a crosshead driving device. Large diesel engine 100 includes a second embodiment of connection arrangement 10 according to the present invention that can be seen in cross-sectional illustration in FIG. The cross section is taken along section line III-III in FIG.

  Parts having the same or comparable functions are provided and are provided with the same reference numbers in FIGS. 2 and 3 as in FIG. All explanations made in connection with FIG. 1 and the first embodiment are also valid for the second embodiment in a similar or correspondingly identical manner.

  The large diesel engine 100 typically includes a plurality of cylinders 101, only one of which can be seen in FIG. In each cylinder 101, a piston 102 is disposed so as to be movable back and forth. The piston 102 is connected to a crosshead (not shown) by a piston rod 103, and the crosshead is then connected to a crankshaft (not shown) via a push rod.

  An exhaust valve 104 is provided in each cylinder and is hydraulically operated in a known manner. This operation takes place via a common rail system included in the second embodiment of the connection arrangement 10 according to the invention. The common rail system for controlling the exhaust valve 104 includes a pressure reservoir 2 that is made as a pressure pipe for the hydraulic medium.

  Here, the device 3 is the valve control device 3 connected to the connection hole 23 of the pressure storage tank 2 via the high-pressure connection 1 (see FIG. 3). The second end face 13 of the high-pressure connection 1 is arranged in the hole 31 of the valve control device 3 in a manner similar to that illustrated in FIG. In this regard, the high-pressure connection 1 is received by the valve control device without threads. The valve control device 3 includes a main pilot valve 35 that is electrically pre-controlled and an electromagnetic pilot valve 36 that is actuated by the control device 105 via a signal line 106. As soon as the pilot valve 36 opens the main pilot valve 35, the hydraulic medium can flow from the pressure reservoir 2 to the exhaust valve 104 through the pressure pipe 107 to open the exhaust valve 104.

  Further, a pump 108 is provided for transporting the hydraulic medium from a storage container (not shown) through the pipe 109 into the pressure storage tank 2.

  FIG. 2 illustrates only one valve control device 3. However, a respective valve control device 3 is provided for each cylinder, which is connected in each case to a separate connection hole 23 of the pressure reservoir 2 via the high-pressure connection 1.

  The pressure storage tank 2 is connected to the valve control device 3 via the attachment portion 4 (see also FIG. 3). The mounting part 4 surrounds the pressure storage tank 2 in the pipe clamping method. For the attachment of the high-pressure connection 1, a flange 18 is provided on the body 11, the flange 18 being provided with two threaded holes for receiving the first bolt 41. The high-voltage connection portion 1 is attached to the attachment portion 4 using the first bolt 41, that is, is bolted here, and the first bolt 41 is engaged with the screw thread hole of the attachment portion 4. In this regard, the first end face 12 is pushed into the seating surface 24 so that sealing is already achieved between the high-pressure connection 1 and the pressure reservoir 2. Thereby, at least main sealing is achieved.

  In order to connect the high-pressure connection 1 to the valve control device 3, a sealing element 17 adapted as an O-ring sealing between the wall 32 of the hole 31 and the main body 11 of the high-pressure connection 1 is used. The two end faces 13 are introduced into the bore 31. Next, the valve control device 3 is attached, and is bolted using the second bolt 42 at the attachment portion 4.

  In the operating state, the hydraulic medium also pressurizes the second end face 13 of the high-pressure connection, which is disposed in the hole 31 of the valve control device 3 (see also FIG. 1). Since the active surface of the second end face 13 is larger than the active surface of the first end face 12, the high-pressure connection 1 is sealingly pushed into the seating surface 24 of the pressure storage tank 2 at the first end face 12.

  The overall support configuration of the connection configuration 10, including the pressure reservoir 2, the high pressure connection 1, the valve control device 3, and the mounting portion 4, is preferably achieved only via the valve control device 3. As described above, since a plurality of valve control devices 3 are provided, the connection configuration 10 is supported via a plurality of locations. As shown in FIG. 3, the valve control device 3 is fixedly attached to the large diesel engine 100 and / or the support body 5 provided therefor. The pressure reservoir 2 is clamped laterally next to the valve control device 3 via the attachment 4 with respect to the normal operating position corresponding to the illustration shown in FIGS. The pressure reservoir 2 made as a pressure pipe does not have direct support to the engine and / or engine housing, but is only supported via the valve control device 3.

  This lateral arrangement of the pressure reservoir 2 next to the valve control device 3 and / or generally next to the device 3 is a new means in the large diesel engine 100, which is a high-pressure connection 1 according to the invention. Can be used independently and / or independently of the connection arrangement 10 according to the invention.

  It is state-of-the-art to mount the pressure reservoir fixedly on the engine, for example on a support, so that the connection hole faces vertically upwards with respect to the normal operating position. In that case, the device 3 and / or the valve control device 3 are arranged on the pressure reservoir. For this purpose, the pressure reservoir must have a planar surface on its upper side in order to mount the valve control device, and the valve control device is connected to this planar surface via a bolt. Fixedly attached. In this case, these bolts engage the wall of the pressure reservoir, which means that the wall of the pressure reservoir must be provided with a threaded hole. In this vertical arrangement, for example, dynamic forces that occur immediately after the switching of the valve control device travel through the pressure reservoir into the support. The entire configuration is supported via a pressure reservoir.

  In contrast to this state of the art, the arrangement of the pressure reservoir 2 in the lateral direction of the device 3 and / or the valve control device 3 has several advantages.

  For example, the dynamic force that occurs immediately after the switching of the valve control device 3 is not essentially introduced into the pressure reservoir 2 but is transferred directly from the valve control device 3 to the support 5. This significantly reduces the mechanical load on the pressure reservoir 2.

  A further advantage is that because of the mounting part 4, the pressure reservoir 2 no longer needs to have a planar surface on its outside, which on the one hand increases the mechanical stability and, on the other hand, increases production. Keep it simple.

  Furthermore, the wall 21 of the pressure reservoir 2 has no holes and no threaded holes. This is because not only the first mounting bolt 41 but also the second mounting bolt 42 engages with the mounting portion 4 but does not engage with the wall 21 of the pressure storage tank 2. Thereby, the mechanical stability of the pressure reservoir 2 is greatly increased, which results in the pressure reservoir 2 being manufactured with thinner walls 21 despite the same operating pressure.

1 High pressure connection
2 pressure reservoir
3 device (apparatus) / valve control unit
4 Mounting
5 Support
10 Connection arrangement
11 Body
12 First end face
13 second end face
14 Inlet opening
15 passage bore
16 outlet opening
17 Sealing element
21 wall
22 storage space
23 connection bore
24 seating surface
31 cavity / bore
32 wall
41 first bolt
42 second bolt
100 large diesel engine
101 cylinder
102 piston
103 piston rod
104 outlet valve
A longitudinal axis
L cylinder axis

Claims (12)

A high-pressure connection for connecting a device operated with pressurized fluid to a pressure reservoir for said fluid,
The pressure storage tank has at least one connection hole that opens to a seating surface;
The high pressure connection includes a body extending in a longitudinal axis direction from a first end surface to a second end surface, the first end surface being configured to cooperate sealingly with the seating surface, and an inlet The second end face is configured to be received by the device and has an outlet opening connected to the inlet opening via a passage hole;
Said second end surface, the greater than the first end surface active surface of, possess an active surface for the fluid,
The high-pressure connection is received by the device without using threads ,
High pressure connection.   The high-pressure connection according to claim 1, wherein the first end surface is made as a conical surface or a truncated conical surface.   The high-voltage connection according to claim 1 or 2, wherein the second end face is produced as a circular surface. A pressure reservoir for the fluid to be pressurized, a device operated with the fluid, and a high pressure connection, the fluid can reach the device from the pressure reservoir through the high pressure connection; A connection configuration,
The pressure storage tank has at least one connection hole that opens to a seating surface, and the high-pressure connection portion includes a body that extends from a first end surface to a second end surface in a longitudinal axis direction, and the first end surface is And configured to cooperate sealingly with the seating surface and having an inlet opening, the second end surface being configured to be received by the device and to the inlet opening via a passage hole An outlet opening to be connected, the high pressure connection portion being connected to the seating surface at a first end surface thereof so that the fluid can flow from the pressure reservoir into the device through the passage hole of the high pressure connection portion. In contact with the device at its second end face,
Said second end surface, the greater than the first end surface active surface of, possess an active surface for the fluid,
The high-pressure connection is received by the device without using threads ,
Connection configuration.   The connection configuration according to claim 4, wherein the pressure storage tank is manufactured as a pressure pipe.   6. A connection arrangement according to claim 4 or 5, wherein the device is fastened laterally to the pressure reservoir with respect to a normal operating position.   The connection configuration according to any one of claims 4 to 6, wherein an attachment portion is provided, the attachment portion surrounds the pressure storage tank, and the high-pressure connection portion is attached to the attachment portion.   The connection configuration according to claim 4, wherein the second end surface of the high-voltage connection portion is disposed inside a hole of the device. The connection structure according to any one of claims 4 to 8 , wherein the pressure storage tank is a pressure pipe for a hydraulic medium or fuel in a large diesel engine. A large-sized diesel engine having the high-pressure connection portion according to any one of claims 1 to 3 or having the connection configuration according to any one of claims 4 to 9 . The pressure reservoir is a pressure pipe for a hydraulic medium or fuel, the pressure pipe is supported through the device, and the pressure pipe is laterally fastened to the device with respect to a normal operating position. Item 11. The large diesel engine according to Item 10 . The large-sized diesel engine according to claim 10 or 11 , wherein the device is a valve control device for hydraulic operation of an exhaust valve.

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