KR20110014111A - High pressure connection and connection arrangement - Google Patents

Abstract

PURPOSE: A high-pressure connecting unit and a connecting device are provided to remove the need for a plane surface on the outer side of a pressure storing unit since a mount for increasing mechanical stability and simplifying manufacturing processes is employed. CONSTITUTION: A connecting device comprises a pressure storing unit(2), a fluid driven unit(3) and a high-pressure connecting unit(1). The fluid passes through the high-pressure connecting unit, when arriving at the fluid driven unit from the pressure storing unit. The pressure storing unit comprises one or more connecting bores(23), which are open to a seating surface(24). The high-pressure connecting unit comprises a body(11), which is extended from a first surface(12) to a second end surface(13) in a direction of a longitudinal axis(A). The first end surface cooperates with the seating surface(24) in a sealing way and comprises an opening(14). The second end surface is accepted by the fluid driven unit.

Description

HIGH PRESSURE CONNECTION AND CONNECTION ARRANGEMENT}

The present invention relates to a high pressure connection and a connecting device having a pressure reservoir according to the preamble of each category of independent claims. The invention also relates to a large diesel engine having such a high pressure connection and / or such a connection device.

In devices where fluids, in particular liquids, are to be guided under high pressure, the devices require a connection between the individual parts that must withstand high pressure and which must also be leakproof. For example, it describes here a large diesel engine, which may consist of a two-stroke or four-stroke engine, is mainly used as a drive unit for ships, or is also used in stationary operation, for example to drive large generators for the generation of electrical energy. .

In modern large diesel engines, in particular, there are two media that are conveyed under very high pressures, one being fuel delivered to the injection nozzle at a pressure above 1000 bar, and the other typically called servo oil. It is a hydraulic medium. The hydraulic medium serves, for example, for the hydraulic drive of the outlet valve. This medium is transferred to the pressure reservoir by a pump, which consists of a pressure pipe and extends mainly along the entire cylinder area. From this pressure reservoir, also called an accumulator, the medium moves to the spray member or to the control and / or actuating device for the hydraulic component.

The connection between a device requiring a medium and a pressure reservoir is mainly based on a screw connection, in which the device is pressurized by means of a threaded seal on the wall of the pressure reservoir or a corresponding outlet bore of the pressure reservoir. Screwed directly into Welding or soldered connections are also known.

It is an object of the present invention to provide different structurally simple and reliable high pressure connections that allow pressurized liquid to be transferred from the pressure reservoir to the apparatus. In addition, such a connection device must be provided. In particular, the high pressure connection should be suitable for use in large diesel engines.

The subject matter of the present invention that meets this object is characterized by the features of the independent claims in each category.

Therefore, according to the invention, a high pressure connection is provided for connecting a device operated by a pressurized fluid to a pressure reservoir for the fluid, the pressure reservoir having at least one connecting bore opening to a seating surface and The high pressure connection comprises a body extending from the first end face to the second end face in the direction of the longitudinal axis, the first end face sealingly cooperating with the seating surface and having an inlet opening, the second end face being the device And an outlet opening received by and connected to the inlet opening through the passage bore. The second end face has an active surface for fluid larger than the active surface of the first end face.

In this regard, an active surface means a vertical projection plane of each end face on a plane lying perpendicular to the longitudinal axis, ie a surface that determines the force acting on the end face due to the fluid. Since the active surface for the second end face is larger than the active surface for the first end face, the pressure exerted by the fluid is essentially the same at both end faces, but due to the fluid in the operating state the second end is greater than the first end face. A greater force acts on the face, so that the high pressure connection is sealingly pressed against the seating surface by its first end face. Therefore, a high pressure leak-proof connection sealed by pressurized fluid can be realized. In principle, no threaded or welded connections are required for this sealing function.

Preferably, the first end face consists of a conical surface or a truncated conical surface. Due to this geometry of the first end face a particularly good sealing action can be achieved in connection with the pressure reservoir.

Preferably, the second end face consists of a circular surface. On the other hand, this is structurally simple and maximizes the active surface of the second end face with a second end face of a predetermined diameter.

Also provided by the present invention is a connection device having a pressure reservoir for pressurized fluid, a device actuated by the fluid, and a high pressure connection through which fluid passes when it arrives from the pressure reservoir. And at least one connecting bore opening to the seating surface, wherein the high pressure connection comprises a body extending from the first end face to the second end face in the direction of the longitudinal axis, the first end face sealingly cooperating with the seating surface. And an inlet opening, the second end face having an outlet opening received by the device and connected to the inlet opening through the passage bore, wherein the high pressure connection is configured such that fluid flows from the pressure reservoir through the passage bore of the high pressure connection. Contact with the seating surface by its first end face and by its second end face so that it can flow into. The second end face has an active surface for fluid larger than the active surface of the first end face.

In this connection arrangement the sealing between the high pressure connection and the pressure reservoir is mainly achieved by the pressure of the fluid applied to the second end face. Since the active surface of the second end face is larger than the active surface of the first end face, a force for sealingly pressing the first end face against the seating surface of the pressure reservoir occurs.

In an important application for the practice, the pressure reservoir consists of a pressure pipe.

The device is structurally beneficial when laterally fastened to the pressure reservoir with respect to the normal operating position. Thus, pressure beats occurring in the operating state of the device, for example by opening, closing or switching of the valve, can avoid causing the introduction of force into the pressure line.

It is a further advantageous measure to provide a mounting surrounding the pressure reservoir and to attach a high pressure connection to this mounting. This avoids the need for the high pressure connection to be tightened directly to the wall of the pressure reservoir.

Advantageously, the second end face of the high pressure connection is arranged in the bore of the device. This measure makes it possible for the fluid to exert a particularly good pressure on the second end face.

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

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

Also provided by the present invention is a large diesel engine with a high pressure connection according to the invention or a connection device according to the invention.

Preferably, the pressure reservoir is a pressure pipe for the hydraulic medium or fuel of a large diesel engine, the pressure pipe is supported through the device and the pressure pipe is laterally fastened to the device with respect to the normal operating position. That is, it is achieved that the pressure bit in the device is transmitted to the support device of the device and that the pressure bit does not result in a significant introduction of the force into the pressure pipe.

Particularly suitable applications for the implementation are when the device is a valve control unit for hydraulic drive of the outlet valve.

Advantageous measures and preferred embodiments of the invention emerge from the dependent claims.

Hereinafter, the present invention will be described in more detail with reference to the embodiments and the drawings. In the schematic drawing, which is not shown to scale, a partial cross section is shown.

1 shows a first embodiment of a connection device according to the invention together with an embodiment of a high pressure connection according to the invention.
2 shows an embodiment of a large diesel engine according to the invention together with a second embodiment of the connecting device according to the invention.
FIG. 3 shows a sectional view of the second embodiment along section line III-III of FIG. 2.

1 shows, in cross section, a first embodiment of a connection device according to the invention comprising an embodiment of a high voltage connection according to the invention, which is generally indicated by reference numeral 10 and is indicated by reference numeral 1 as a whole. In addition, the connecting device 10 comprises a pressure reservoir 2 for a fluid and a device 3 in which only a part is operated which is operated with the aid of pressurized fluid.

The fluid may be any gas or liquid medium that can be used in a work process under pressure, such as hydraulic oil or servo oil for hydraulic actuation or actuation, such as pistons, valves, fuel for injection into a cylinder of an internal combustion engine, or It may be water to be conveyed under pressure.

The device 3 can be any desired device that can be operated by pressurized liquid, such as a control valve for conveying liquid, a hydraulically actuated piston, a pump or a pressure line.

The pressure reservoir 2 may consist of a pressure pipe having a cylindrical axis L, for example a pipe-shaped and in particular a cylindrical, such as a pressure reservoir used in common rail systems today. The pressure reservoir 2 comprises a wall 21 which is a storage space 22 for pressurized liquid inside. The pressure reservoir 2 comprises at least one connecting bore 23 extending radially outward from the storage space 22 through the wall 21 and opening to the seating surface 24. The seating surface 24 is made conical.

For the pipe-shaped pressure reservoir 2 of the common rail system, there are typically a plurality of connecting bores 23 arranged behind each other with respect to the cylindrical axis L in accordance with the illustration (FIG. 1). Since only one connecting bore is sufficient for understanding, the following description will be limited to only one connecting bore 23.

The high pressure connection 1 comprises a main body 11 extending along the longitudinal axis A from the first end face 12 to the second end face 13. The first end face 12 cooperates sealingly with the seating surface 24. In the following embodiments, the first end face 12 consists of a conical surface and / or a truncated conical surface. In this regard, the associated cone angle of the first end face 12 may be the same size as the cone angle associated with the seating surface 24 or may be slightly smaller depending on the material.

For a better understanding, FIG. 1 shows a high pressure connection 1 separate from the pressure reservoir 2. In the operating state, it is understood that the high pressure connection 1 has its end face 12 pressed against the seating surface 24 to achieve a high pressure leak-proof connection between the pressure reservoir 2 and the high pressure connection 1. If the conical angle of the first seating surface 12 is small compared to the seating surface 24, due to the pressure present, the first end face 12 is deformed in the operating state to conform to 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 arranged passage bore 15 extends from the inlet opening 14 in the direction of the longitudinal axis A to the outlet opening 16 provided in the second end face 13. The second end face 13 consists of a circular surface and / or a ring surface in this embodiment.

The second end face 13 is adapted to be received by the device 3. The device 3 has a cavity or bore 31 defined by the wall 32 and which receives the second end face 13. According to the illustration, the body 11 of the high pressure connection 1 has a groove under the second end face 13, which extends over the entire circumference, in which the wall 32 and the body 11 are located. A sealing element 17, for example an O-ring, which seals the gap is arranged.

The first end face 12 and the second end face 13 each have an active surface. This means an effective surface, whereby the pressure acting on each end face 12, 13 can produce a force in the longitudinal axis direction, ie up or down depending on the illustration. The active surface is therefore the vertical projection surface of each end face 12, 13 on the plane lying perpendicular to the longitudinal axis A. For the first end face 12, the active surface is the same size as the cross section at the position W1 indicated by the arrows in FIG. 1. For the second end face 13, the active surface is the same size as the first end face 13.

According to the 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 is located above the second end face 13 as shown, via the connecting bore 23 and the passage bore 15 from the storage space 22 of the pressure reservoir 2. 3) flows to the part of the bore 31. From there, the fluid can flow, for example, through the channel 33 available in the device 3.

Due to the fluid, essentially the same pressure acts on the second end face 13 as is present in the storage space 22. Since the second end face 13 has a larger active surface than the active surface of the first end face 12, in all cases it faces in the direction of the longitudinal axis—downwardly as shown—and the seating surface faces the first end face. A sealing pressing force is generated at the 24. Thus, a sealing function caused by the pressure of the fluid can be achieved.

In principle, screw connections and also other types of attachment, for example by welding or soldering, are not required for this sealing. However, for example, in order to guide the high pressure connection 1 in the direction of the longitudinal axis A or to avoid the inclination of the high pressure connection or to achieve a main seal, bolts or other attachment means or guide means are additionally provided. It is understood that it can be. This is described according to, for example, the second embodiment.

In the second embodiment, reference is made to a large diesel engine which is an important application for the implementation. In modern large diesel engines, fuel injection, gas discharge, and optionally water injection and auxiliary systems are operated by common rail systems. In this connection, each fluid, for example fuel for injection, hydraulic medium such as servo oil for operation of the outlet valve, or working medium for control of the injection is conveyed by the pump under high pressure to a pressure reservoir, also known as an accumulator. do. All cylinders of the internal combustion engine are provided with pressurized fluid from each accumulator and / or valves and fuel injectors are controlled by pressurized liquid. Typically, the pressure reservoirs are each made of pipe-shaped parts that are sealed at both ends and extend along the engine at approximately the level of the cylinder head.

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

2 shows, in partial schematic form, a part of an embodiment of a large diesel engine according to the invention, which is suitable for the understanding of the invention, which is indicated generally by the numeral 100. In particular, this embodiment is a low speed traveling single-stage exhaust two-stroke large diesel engine 100 having a cross-head drive. The large diesel engine 100 comprises a second embodiment of the connecting device 10 according to the invention, which can be seen in cross section in FIG. 3. This cross section is taken along section line III-III in FIG.

In Figures 2 and 3, parts having the same or similar functions are provided with the same reference numerals as in Figure 1. All descriptions made in connection with FIG. 1 and the first embodiment are used in a similar or corresponding same way for the second embodiment.

Large diesel engine 100 typically includes a plurality of cylinders 101, of which only one can be seen in FIG. 1. In each cylinder 101, the piston 102 is arranged to be movable back and forth. The piston 102 is connected to a cross-head not shown by the piston rod 103, which in turn is connected to a crankshaft (not shown) via a push rod.

An outlet valve 104 is provided for each cylinder and hydraulically driven in a known manner. This drive takes place via the common rail system included in the second embodiment of the connecting device 10 according to the invention. The common rail system for the control of the outlet valve 104 comprises a pressure reservoir 2 made of a pressure pipe for the hydraulic medium.

Here, the device 3 is a valve control unit 3 which is connected to the connection bore 23 of the pressure reservoir 2 via a high pressure connection 1 (see FIG. 3). The second end face 13 of the high pressure connection 1 is arranged in the bore 31 of the valve control unit 3 in a manner similar to that shown in FIG. 1. In this connection, the high pressure connection 1 is received by the valve control unit without a thread. The valve control unit 3 comprises an electrically pre-controlled main pilot valve 35 and an electromagnetic pilot valve 36 driven by the control unit 105 via the signal line 106. do. As soon as the pilot valve 36 opens the main pilot valve 35, the hydraulic medium flows from the pressure reservoir 2 through the pressure line 107 to the outlet valve 104 to open the outlet valve 104.

In addition, a pump 108 is provided for transferring the hydraulic medium from the reservoir not shown to the pressure reservoir 2 via the line 109.

Although only one valve control unit 3 is shown in FIG. 2, in each case each cylinder 101 is connected to an individual connecting bore 23 of the pressure reservoir 2 via a high pressure connection 1. It is understood that each valve control unit 3 is provided.

The pressure reservoir 2 is connected to the valve control unit 3 via the mounting 4 (see FIG. 3). The mounting 4 surrounds the pressure reservoir 2 in the manner of a pipe clamp. For attachment of the high pressure connection 1, a flange 18 is provided on the body 11 of the high pressure connection 1, which has two threadless bores for receiving the first bolt 41. Is provided. The high pressure connection 1 is attached to the mounting 4 by means of a first bolt 41, which is coupled to the threaded bore of the mounting 4, ie tightened here. In this connection, the first end face 12 is pressed against the seating surface 24 such that a seal is already achieved between the high pressure connection 1 and the pressure reservoir 2. This at least achieves a main seal.

In order to connect the high pressure connection 1 to the valve control unit 3, a second end face 13 is introduced into the bore 31, the wall 32 of the bore 31 and the body of the high pressure connection 1. The sealing element 17 is applied as an O-ring seal between 11. Thereafter, the valve control unit 3 is mounted to the mounting 4 by the second bolt 42 and tightened.

In addition, in the operating state, the hydraulic medium pressurizes the second end face 13 of the high pressure connection portion disposed in the bore 31 of the valve control unit 3 (see 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 has a first end face 12 with the seating surface of the pressure reservoir 2. It is pressed against 24 sealingly.

The overall support configuration of the connection device 10, including the pressure reservoir 2, the high pressure connection 1, the valve control unit 3 and the mounting 4, is preferably achieved only through the valve control unit 3. Do. As already mentioned, since a plurality of valve control units 3 are provided, the connecting device 10 is supported through a plurality of places. As shown in FIG. 3, the valve control unit 3 is fixedly attached to the large diesel engine 100 and / or the support 5 provided therein. The pressure reservoir 2 is fastened laterally via a mounting 4 next to the valve control unit 3 with respect to the normal operating state corresponding to the aspects shown in FIGS. 2 and 3. The pressure reservoir 2 made as a pressure pipe is not directly supported in the engine and / or the engine housing, but only through the valve control unit 3.

This arrangement, in which the pressure reservoir 2 is arranged sideways next to the valve control unit 3 and / or generally next to the device 3, is independent of and / or independent of the high pressure connection 1 according to the invention. It is a new measure in large diesel engines that can also be used independently and in connection to the connecting device 10 according to the invention.

It is a state of the art to mount the pressure reservoir fixedly to the engine, for example at the support and in practice so that the connecting bore faces upwardly perpendicular to the normal operating position. The device 3 and / or the valve control unit 3 are located at the top of the pressure reservoir. For this purpose, the pressure reservoir must have a flat surface on top for mounting the valve control unit, which is fixedly mounted to this flat surface via bolts. This bolt is coupled to the wall of the pressure reservoir, which means that a threaded bore must be provided on the wall of the pressure reservoir. In this vertical configuration, for example, the dynamic force generated at the time of switching of the valve control unit goes to the support via the pressure reservoir. The overall configuration is supported by the pressure reservoir.

In contrast to this state of the art, a configuration with a pressure reservoir 2 next to the device 3 and / or the valve control unit 3 has several advantages.

For example, the dynamic force occurring at the time of switching of the valve control unit 3 is not introduced into the pressure reservoir 2 essentially, but is transmitted directly from the valve control unit 3 to the support 5. This significantly reduces the mechanical load of the pressure reservoir 2.

A further advantage is that, due to the mounting 4, which on the one hand increases mechanical stability and on the other hand simplifies manufacturing, the pressure reservoir 2 no longer has to have a flat surface on its outside.

In addition, since the first attachment bolt 41 as well as the second attachment bolt 42 are coupled to the mounting 4 but not to the wall 21 of the pressure reservoir 2, Wall 21 is free of bores and threaded bores. In this way, the mechanical stability of the pressure reservoir 2 is greatly increased, which allows the pressure reservoir 2 to be manufactured with a thinner wall 21 despite the same operating pressure.

1 high pressure connection
2 pressure reservoir
12 first end face
13 second end face
23 connection bore
24 seating surface
A vertical axis

Claims (13)

A high pressure connection for connecting a device 3 operated by pressurized fluid to a pressure reservoir 2 for the fluid, the pressure reservoir having at least one connecting bore 23 which opens to the seating surface 24. And the high pressure connection portion comprises a body 11 extending from the first end face 12 to the second end face 13 in the direction of the longitudinal axis A, wherein the first end face 12 comprises a seating surface ( Sealedly cooperating with 24 and having an inlet opening 14, the second end face 13 is received by the device 3 and connected to the inlet opening 14 via the passage bore 15. In the high pressure connection provided with 16,
The second end face (13) is characterized in that it has an active surface for fluid larger than the active surface of the first end face (12). The high pressure connection according to claim 1, wherein the first end face (12) consists of a conical surface or a truncated conical surface. The high pressure connection according to claim 1 or 2, wherein the second end face (13) consists of a circular surface. A pressure reservoir 2 for pressurized fluid, a device actuated by the fluid, and a high pressure connection 1 which is passed through when the fluid arrives at the device 3 from the pressure reservoir 2; As a connection device, the pressure reservoir 2 has at least one connection bore 23 which opens to the seating surface 24, the high pressure connection 1 having a first end face (in the direction of the longitudinal axis A) ( A main body 11 extending from 12) to a second end face 13, the first end face 12 sealingly cooperating with the seating surface 24 and having an inlet opening 14; The two end faces 13 have an outlet opening 16 which is received by the device 3 and connected to the inlet opening 14 via the passage bore 15, wherein the high pressure connection 1 has a fluid connection to the high pressure connection. To the first end face 12 so that it can flow from the pressure reservoir to the device 3 via the passage bore 15 of 1. In the connecting device in contact with the seating surface 24 and in contact with the device 3 by its second end face 13,
The second end face (13) is characterized in that it has an active surface for fluid larger than the active surface of the first end face (12). The connecting device according to claim 4, wherein the pressure reservoir (2) consists of a pressure pipe. The connecting device according to claim 4 or 5, wherein the device (3) is laterally fastened to the pressure reservoir (2) with respect to the normal operating position. The connecting device according to any one of claims 4 to 6, wherein a mounting (4) surrounding said pressure reservoir (2) is provided, to which said high pressure connection (1) is attached. . The connecting device according to claim 4, wherein the second end face (13) of the high pressure connection (1) is arranged in a bore (31) of the device (3). 9. The connection device according to claim 4, wherein the high voltage connection is received by the device without threading. 10. 10. The connecting device according to claim 4, wherein the pressure reservoir (2) is a pressure pipe for a hydraulic medium or fuel of a large diesel engine (100). 11. A large diesel engine comprising a high pressure connection (1) according to any one of claims 1 to 3 or a connection device (10) according to any one of claims 4 to 10. 12. The pressure reservoir (2) according to claim 11, wherein the pressure reservoir (2) is a pressure pipe for a hydraulic medium or fuel, the pressure pipe being supported via the device (3), the pressure pipe being connected to the device (3) with respect to a typical operating position. Large diesel engine, fastened sideways to). 13. The large diesel engine according to claim 11 or 12, wherein the device (3) is a valve control unit for hydraulic drive of the outlet valve (104).

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