JP2013185596A - Block fluid guide portion, and common rail fuel system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a block fluid-guide portion where leakage to an outside is avoided in high reliability in a block fluid-guide portion, and to provide a common rail fuel system having such a block fluid-guide portion.SOLUTION: In a block fluid-guide portion (10) and a common rail fuel system, at least one high pressure fluid path (20) provided in a fluid-guide portion provided for a high pressure fluid system and adapted to an impact due to a high pressure fluid coming from a high pressure fluid system is formed, wherein the fluid-guide portion is formed to avoid leakage which goes out from the fluid-guide portion in high reliability, and this is achieved by making a discharge path (30) extending adjacent to a high pressure fluid path along at least a part of a high pressure path extending section to be separated from a high pressure fluid system in view of fluid in the fluid-guide portion, and be formed to have an open fluid port (31) that is opened for having fluid communication with a low pressure fluid system.

Description

  The present invention relates to a block-like fluid guide formed according to the preamble of claim 1 for a high-pressure fluid system, and a common rail fuel system comprising such a block-like fluid guide.

  A block-like fluid guiding part and a common rail fuel system of the type mentioned at the beginning are known from US Pat.

  It is known from such a common rail fuel system that the high-pressure pipe incorporated in it must be carried out with a double wall (with casing pipe), which occurred when the high-pressure pipe was damaged The leaked fuel can be received and led out in the casing tube, so that, for example, a person is not injured. On the other hand, block-like fluid guides, such as distribution blocks for high-pressure pipes and valve supports for high-pressure pumps, are implemented as robust steel parts, so that they are thick (too strong enough) Is not covered.

  In practice, however, the block-like fluid guide of the high-pressure fluid system is cracked, which causes leakage to the outside.

German Patent Application Publication No. 10 2009 032 305

  An object of the present invention is to provide a block-like fluid guiding part according to the preamble of claim 1 and a common rail fuel system having such a block-like fluid guiding part that leaks out of the block-like fluid guiding part. Is to be avoided with high reliability.

  This is achieved by a block-like fluid guide according to claim 1 or a common rail fuel system according to claim 7. Variations of the invention are defined in the respective dependent claims.

  According to a first aspect of the present invention, a block-like fluid guide for a high-pressure fluid system is provided, in which at least one high-pressure fluid path adapted for impact by a high-pressure fluid coming from the high-pressure fluid system Is formed. A feature of the block-shaped fluid guiding portion according to the present invention is that, in the fluid guiding portion, a discharge path extending next to the high-pressure fluid path along at least a part of the extending section of the high-pressure fluid path is a high-pressure fluid in terms of fluid. It is configured to have an open fluid port that is separate from the system and for fluid communication with the low pressure fluid system.

  In the specification of the present invention, the block is preferably a block of material fixedly connected in a shape similar to a rectangular parallelepiped, and may of course have other shapes such as a cylindrical shape.

  Using the solution according to the invention, if the high-pressure fluid path is not tight due to crack formation and / or breakage, the leaking out of the high-pressure fluid path is reliably introduced into the discharge path and this discharge It discharges to a low-pressure fluid system through a channel. As a result, the spilled material is not discharged to the outside, but is led out in the fluid guide, thereby avoiding contamination and risk of injury.

  According to one embodiment of the block-shaped fluid guide according to the present invention, the discharge path extends parallel to the high-pressure fluid path.

  This has the advantage that the wall thickness between the discharge path and the high-pressure fluid path along the extension section of the discharge path is always constant, so that compliance with the required minimum wall thickness can be ensured more reliably.

  According to a further embodiment of the block-like fluid guiding part according to the invention, the discharge channel has the highest probability of crack formation in the high-pressure fluid channel when viewed in the cross-section of the high-pressure fluid channel, the circumferential direction of the high-pressure fluid channel Placed in position.

  This circumferential position can be determined using, for example, a finite element method based on the design data of the fluid guide, for example, the circumferential position with the smallest wall thickness and / or the wall step formed by, for example, cutting. Can be a circumferential position.

  According to another embodiment of the block-like fluid guiding part according to the invention, the fluid guiding part has a wall thickness of a wall defining the high-pressure fluid path over a wide area when viewed in cross section of the high-pressure fluid path. The discharge passages are arranged at the circumferential positions of the walls of the high-pressure fluid passage having the smallest wall thickness when viewed in a cross section of the high-pressure fluid passage.

  This circumferential position may have the highest probability of crack formation in, for example, a high pressure fluid path. With this exact selection of the positioning of the discharge path, it is possible to more reliably avoid leakage of leaked material from the fluid guiding part to the outside.

  According to a still further embodiment of the block-like fluid guide according to the invention, the fluid guide is formed as a valve support for a high-pressure pump, for example a high-pressure pump of a common rail fuel system.

  According to another embodiment of the block-like fluid guide according to the invention, the fluid guide is as a distribution block for connecting a number of high-pressure pipes of a high-pressure fluid system, for example a high-pressure fluid system of a common rail fuel system. Is formed.

  According to a further embodiment of the block-like fluid guide according to the invention, the high-pressure fluid path and the discharge path are each formed in the form of a perforation.

  In accordance with a second aspect of the present invention, a common rail fuel system is considered a high pressure fluid system that supplies high pressure fuel for an internal combustion engine and a low pressure fluid system that supplies low pressure fuel for the high pressure fluid system. Block fluid guides according to one, a plurality, or all of the embodiments of the present invention in all combinations obtained, the high pressure fluid path of the fluid guides being connected to the high pressure fluid system; The discharge path of the fluid guide is connected to a low pressure fluid system.

  Using the solution according to the invention, when the high-pressure fluid path is not tight due to crack formation and / or breakage, the leaked fuel flowing out of the high-pressure fluid path can be reliably introduced into the discharge path, And it can discharge | emit to a low pressure fluid system, for example, a fuel tank, through this discharge path. As a result, the leaked fuel does not flow out, but is led out in the fluid guide, thereby avoiding contamination and the risk of injury (eg due to fire or explosion caused by leaked fuel).

  According to one embodiment of the common rail fuel system according to the present invention, the common rail fuel system comprises a high pressure pump for generating high pressure in the high pressure fluid system, where the fluid guide is as a valve support for the high pressure pump. Is formed.

  According to a further embodiment of the common rail fuel system according to the invention, the high-pressure fluid system comprises a number of high-pressure pipes, in which case the fluid guide is formed as a distribution block of the high-pressure fluid system, the high-pressure pipe being provided in this distribution block. It is connected.

  The present invention clearly extends to embodiments that are not envisaged by a combination of features based on a clear reference in the claims, i.e. the disclosed features of the invention are technically significant. Can be arbitrarily combined with each other.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the accompanying drawings.

It is a longitudinal cross-sectional view of the block-shaped fluid guide | induction part according to one Embodiment of this invention.

  FIG. 1 shows a longitudinal cross-sectional view of a block-like fluid guide 10, which is in accordance with one embodiment of the present invention, a common rail fuel system (not fully shown and labeled). Is not a component).

  The common rail fuel system includes a high pressure fluid system (not shown and labeled) that supplies high pressure diesel fuel for an internal combustion engine (not shown), and a high pressure fluid system. A low-pressure fluid system (not fully shown and not labeled) for supplying low-pressure diesel fuel (for example from a fuel tank not shown) and block fluid guidance Part 10.

  The common rail fuel system further includes a high pressure pump 1 (not shown in full) for generating high fuel pressure in the high pressure fluid system, and the block-like fluid guide 10 is a valve of the high pressure pump 1. It is formed as a support.

  As shown in FIG. 1, a high-pressure fluid passage 20 formed here as a perforation, for example, is provided in the fluid guiding portion 10, and this high-pressure fluid passage is provided during operation of the common rail fuel system. Impacted by high-pressure diesel fuel (from fluid) coming from.

  Furthermore, in the fluid guiding part 10, it extends parallel to at least a part of the extending section of the high-pressure fluid path 20 next to the high-pressure fluid path 20. In view, it is configured to include an open fluid port 31 that is separate from the high pressure fluid system and the high pressure fluid path 20 and for fluid communication with the low pressure fluid system.

  More specifically, the high pressure fluid path 20 of the fluid guide 10 is connected to the high pressure fluid system via the fluid port 21, and the discharge path 30 of the fluid guide 10 is connected to the low pressure fluid system via the fluid port 31. Has been.

  As can be seen from the longitudinal cross-sectional view of FIG. 1, the fluid guide 10 has a wide range of high-pressure fluid passages 20 when viewed in a cross-section of the high-pressure fluid passage 20 (a cross-section along line AA in FIG. 1). The wall thicknesses of the demarcated walls W1 and W2 are different, and the discharge passage 30 is positioned in the circumferential direction of the wall W1 of the high-pressure fluid passage 20 having the smallest wall thickness when viewed in a cross section of the high-pressure fluid passage 20. (Or on the right side in the longitudinal section of FIG. 1).

  Accordingly, the discharge passage 30 is arranged at a circumferential position of the high-pressure fluid passage 20 where the probability of crack formation and / or breakage in the high-pressure fluid passage 20 is highest when viewed in a cross section of the high-pressure fluid passage 20.

  If cracks and / or breaks are formed in the high pressure fluid path 20, this crack and / or break occurs in the direction of the discharge path 30 since the minimum wall thickness indicates the highest probability, and therefore thereafter the high pressure fluid path The leaked fuel flowing out of 20 can be reliably introduced into the discharge passage 30 and can be discharged to the low-pressure fluid system via this discharge passage. Further, it is preferable that a pressure sensor (not shown) capable of detecting a rapid pressure rise in the discharge passage 30 and thus leaking fuel from the high-pressure fluid passage 20 can be disposed in the discharge passage 30.

  As a result, the leaked fuel does not flow out to the outside, but is led out in the fluid guiding portion 10, thereby avoiding the risk of contamination and injury.

  According to one not-illustrated embodiment of the present invention, the high pressure fluid system of the common rail fuel system can comprise a number of high pressure pipes (eg for supplying diesel fuel to the fuel injection nozzles of the common rail fuel system) In this case, the fluid guiding part is formed as a distribution block of the high-pressure fluid system, and a high-pressure pipe is connected to the distribution block.

DESCRIPTION OF SYMBOLS 1 High pressure pump 10 Fluid guidance | induction part 20 High pressure fluid path 21 Fluid port 30 Outlet path 31 Fluid port W1 Wall W2 Wall

Claims (9)

A block-like fluid guide for a high-pressure fluid system (at least one high-pressure fluid path (20) adapted to the impact of the high-pressure fluid coming from the high-pressure fluid system is formed in the fluid guide (10). 10)
In the fluid guiding part (10), the discharge path (30) extending next to the high-pressure fluid path (20) along at least a part of the extending section of the high-pressure fluid path (20) is a fluid viewpoint. The block-shaped fluid guide section is formed so as to include an open fluid port (31) separated from the high-pressure fluid system and for fluid communication with the low-pressure fluid system.   The block-shaped fluid guide according to claim 1, wherein the discharge passage (30) extends parallel to the high-pressure fluid passage (20).   The circumferential direction of the high-pressure fluid path (20) in which the probability of crack formation in the high-pressure fluid path (20) is highest when the discharge path (30) is viewed in a cross section of the high-pressure fluid path (20). The block-shaped fluid guiding portion according to claim 1 or 2, which is disposed at a position.   The fluid guiding portion (10) has different wall thicknesses of the walls (W1, W2) defining the high-pressure fluid passage (20) over a wide range when viewed in a cross section of the high-pressure fluid passage (20). The discharge passage (30) is disposed at a circumferential position of the wall (W1) of the high pressure fluid passage (20) having the smallest wall thickness when viewed in a cross section of the high pressure fluid passage (20). The block-shaped fluid guiding part according to claim 3, wherein   The block-shaped fluid guiding part according to any one of claims 1 to 4, wherein the fluid guiding part (10) is formed as a valve support for a high-pressure pump (1).   5. The block-shaped fluid guiding portion according to claim 1, wherein the fluid guiding portion is formed as a distribution block for connecting a number of high-pressure pipes of the high-pressure fluid system. The high-pressure fluid system for supplying high-pressure fuel for an internal combustion engine, the low-pressure fluid system for supplying low-pressure fuel for the high-pressure fluid system, and the block according to claim 1. A common rail fuel system comprising:
The high-pressure fluid path (20) of the fluid guiding section (10) is connected to the high-pressure fluid system, and the discharge path (30) of the fluid guiding section (10) is connected to the low-pressure fluid system. , Common rail fuel system.   8. A high-pressure pump (1) for generating high pressure in the high-pressure fluid system, wherein the fluid guide (10) is formed as a valve support for the high-pressure pump (1). Common rail fuel system as described.   The common rail according to claim 7, wherein the high-pressure fluid system includes a plurality of high-pressure pipes, the fluid guide portion is formed as a distribution block of the high-pressure fluid system, and the high-pressure pipe is connected to the distribution block. Fuel system.

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