DE102012203703A1 - Block-shaped fluid line part and common rail fuel system - Google Patents

Abstract

A block-shaped fluid conduit member (10) and common rail fuel system, wherein in the provided for a high-pressure fluid system fluid conduit part at least one high-pressure fluid passage (20) is adapted to be acted upon by a high-pressure fluid from the high-pressure fluid system. The fluid line part according to the invention is designed so that a leaking outward leakage is reliably avoided on the fluid line part. This is achieved by forming in the fluid conduit part at least along a part of a course of the high pressure fluid passage adjacent to it a drainage passage (30) fluidly separated from the high pressure fluid system and having an open fluid port (31) for fluid communication with a low pressure fluid system ,

Description

The invention relates to a formed according to the preamble of claim 1 block-shaped fluid line part for a high-pressure fluid system and equipped with such a block-shaped fluid line part common rail fuel system.

A block-shaped fluid line part and a common rail fuel system of the type mentioned above are each off DE 10 2009 032 305 A1 known.

From such common rail fuel systems, it is known that integrated high-pressure tubes must be double-walled (with jacket tube) in order to catch and discharge any fuel leakage in the jacket tube when the high-pressure tube breaks, so that e.g. Persons are not injured. On the other hand, block-shaped fluid conduit parts, such as e.g. Manifold blocks for the high-pressure pipes and valve supports of high-pressure pumps, etc., are not encased because they are designed as solid steel parts and are therefore considered to be thick-walled (oversized).

However, in practice it still happens that block-shaped fluid line parts of a high-pressure fluid system get cracks and thus cause leaks to the outside.

The invention has for its object to provide a block-shaped fluid line part according to the preamble of claim 1 and equipped with such a block-shaped fluid line part common rail fuel system so that an outwardly leaking leakage is reliably avoided on the block-shaped fluid line part.

This is achieved with a block-shaped fluid line part according to claim 1 and a common rail fuel system according to claim 7. Further developments of the invention are defined in the respective dependent claims.

According to a first aspect of the invention there is provided a block-shaped fluid conduit member for a high pressure fluid system, wherein in the fluid conduit member there is formed at least one high pressure fluid passage configured to be exposed to a high pressure fluid from the high pressure fluid system. The block-shaped fluid line part according to the invention is characterized in that in the fluid line part at least along a portion of a course of the high pressure fluid passage next to the high pressure fluid passage extending a drainage passage is formed so that it is fluidly separated from the high pressure fluid system and having an open fluid port for fluid communication with a low pressure fluid system.

In the context of the invention, a block is to be understood as meaning a piece of firmly bonded material with a preferably parallelepiped-like form, although of course other shapes, such as e.g. a circular cylindrical shape, are possible.

With the solution according to the invention, if the high-pressure fluid passage becomes leaky due to cracking and / or breakage, a leakage emerging therefrom can be reliably introduced into the drainage passage and discharged thereinto into the low-pressure fluid system. As a result, the leak does not leak out, but is drained internally of the fluid conduit part, thereby avoiding soiling and risk of injury.

According to one embodiment of the block-shaped fluid line part according to the invention, the drainage passage extends parallel to the high-pressure fluid passage.

This has the advantage that the wall thickness between the drainage passage and high-pressure fluid passage along the course of the drainage passage always remains the same and thus compliance with a necessary minimum wall thickness can be better guaranteed.

According to another embodiment of the block-shaped fluid line part according to the invention, the drainage passage is arranged in a cross-section of the high-pressure fluid passage on a circumferential position of the high-pressure fluid passage having a highest probability of cracking in the high-pressure fluid passage.

This circumferential position can be e.g. be determined using the method of finite elements based on the design documentation of the fluid line part and could e.g. a circumferential position with the lowest wall thickness and / or a circumferential position with e.g. be produced by cutting paragraphs.

According to yet another embodiment of the block-shaped fluid line part according to the invention seen in cross-section of the high-pressure fluid passage on different wall thicknesses of the high-pressure fluid passage circumferentially bounding walls, the drainage passage is seen in cross-section of the high-pressure fluid passage on a circumferential position of a wall of the high pressure fluid passage with the smallest wall thickness.

This circumferential position can, for example, a highest probability of cracking in the Have high-pressure fluid passage. With this specific selection of the positioning of the drainage passage from the fluid line part to the outside leak leakage can be avoided even more reliable.

According to yet another embodiment of the block-shaped fluid line part according to the invention, this is designed as a valve carrier for a high-pressure pump, such as e.g. a common rail fuel system, formed.

According to yet another embodiment of the block-shaped fluid conduit part according to the invention, this is designed as a distributor block for connecting a plurality of high-pressure tubes of the high-pressure fluid system, such as e.g. a common rail fuel system, formed.

According to a further embodiment of the block-shaped fluid line part according to the invention, the high-pressure fluid passage and the drainage passage are each formed in the form of a bore.

According to a second aspect of the invention, a common rail fuel system includes a high pressure fluid system for providing high pressure fuel to an internal combustion engine, a low pressure fluid system for providing low pressure fuel to the high pressure fluid system, and a block fluid line portion according to one, more or all previously described embodiments of the invention in any conceivable combination wherein the high pressure fluid passage of the fluid conduit portion is connected to the high pressure fluid system and the drainage passage of the fluid conduit portion is connected to the low pressure fluid system.

With the solution according to the invention, when the high-pressure fluid passage is cracked and cracked, leakage of fuel leaking therefrom can be reliably introduced into the drainage passage and introduced into the low-pressure fluid system, e.g. into a fuel tank. As a result, the fuel leakage does not leak out, but is internally drained away from the fluid conduit portion, thereby avoiding soiling and risk of injury (e.g., fires or explosions due to fuel leakage).

According to one embodiment of the common rail fuel system according to the invention, this has a high-pressure pump for generating the high pressure in the high-pressure fluid system, wherein the fluid line part is designed as a valve carrier of the high-pressure pump.

According to a further embodiment of the common rail fuel system according to the invention, the high pressure fluid system comprises a plurality of high pressure pipes, wherein the fluid pipe part is formed as a manifold block of the high pressure fluid system to which the high pressure pipes are connected.

The invention expressly extends to such embodiments, which are not given by combinations of features of explicit back references of the claims, whereby the disclosed features of the invention - as far as is technically feasible - can be combined with each other.

In the following the invention will be described in more detail by means of preferred embodiments and with reference to the attached figure.

1 shows a longitudinal sectional view of a block-shaped fluid line part according to an embodiment of the invention.

1 shows a longitudinal sectional view of a block-shaped fluid conduit part 10 which is part of a common rail fuel system (not fully shown and not designated) according to an embodiment of the invention.

The common rail fuel system includes a high pressure fluid system (not fully shown and not designated) for providing high pressure diesel fuel to an internal combustion engine (not shown), a low pressure fluid system (not fully shown and not designated) for providing low pressure Pressurized diesel fuel (eg, from a fuel tank, not shown) for the high pressure fluid system and the block-shaped fluid conduit part 10 on.

The common rail fuel system also includes a high pressure pump (not fully shown). 1 to generate the high fuel pressure in the high pressure fluid system, the block shaped fluid conduit portion 10 as a valve carrier of the high pressure pump 1 is trained.

As in 1 is shown in the fluid conduit part 10 a here formed as a bore high-pressure fluid passage 20 provided, which is acted upon in the operation of the common rail fuel system with high pressure diesel fuel (as fluid) from the high-pressure fluid system.

In addition, in the fluid conduit part 10 at least along a part of a course of the high pressure fluid passage 20 parallel next to the high pressure fluid passage 20 running a trained here as a bore drainage passage 30 so being configured to fluidly communicate with the high pressure fluid system and the high pressure fluid passage 20 is disconnected and an open fluid connection 31 for fluid communication with the low pressure fluid system.

More precisely, the high pressure fluid passage 20 the fluid line part 10 via a fluid connection 21 connected to the high pressure fluid system and is the drainage passage 30 the fluid line part 10 via the fluid connection 31 connected to the low pressure fluid system.

As seen from the longitudinal section of 1 derivable, has the fluid line part 10 in cross section (section along a line AA in 1 ) of the high pressure fluid passage 20 seen different wall thicknesses of the high pressure fluid passage 20 circumferentially bounding walls W1, W2, wherein the drainage passage 30 in cross section of the high pressure fluid passage 20 seen on a circumferential position of a wall W1 of the high-pressure fluid passage 20 with the smallest wall thickness (or in the longitudinal section of 1 on the right).

This is the drainage passage 30 in cross section of the high pressure fluid passage 20 seen on one the highest probability of cracking and / or breakage in the high pressure fluid passage 20 having circumferential position of the high pressure fluid passage 20 arranged.

When in the high pressure fluid passage 20 a crack and / or a break is formed, this is due to the smallest wall thickness with high probability in the direction of the drainage passage 30 take place, so that one out of the high-pressure fluid passage 20 Relenting fuel leakage reliably into the drainage passage 30 can be introduced and discharged via this in the low-pressure fluid system. In addition, it may be preferable in the drainage passage 30 a pressure sensor (not shown) may be arranged which causes a sudden pressure increase in the drainage passage 30 and thus fuel leakage from the high pressure fluid passage 20 can detect.

As a result, the fuel leakage does not leak out, but becomes internal to the fluid passage part 10 derived, thereby avoiding contamination and injury risks.

According to an unillustrated embodiment of the invention, the high-pressure fluid system of the common-rail fuel system may include a plurality of high-pressure pipes (eg, for supplying the diesel fuel to fuel injectors of the common-rail fuel system), the fluid pipe member being formed as a manifold block of the high-pressure fluid system. where the high pressure pipes are connected.

LIST OF REFERENCE NUMBERS

1

 high pressure pump

10

 Fluid line part

20

 High-pressure fluid passage

21

 fluid port

30

 drainage passage

31

 fluid port

W1

 wall

W2

 wall

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009032305 A1 [0002]

Claims (9)

Block-shaped fluid line part ( 10 ) for a high-pressure fluid system, wherein in the fluid line part ( 10 ) at least one high-pressure fluid passage ( 20 ), which is adapted to be acted upon by a high-pressure fluid from the high-pressure fluid system, characterized in that in the fluid line part ( 10 ) at least along a part of a course of the high pressure fluid passage ( 20 ) next to the high pressure fluid passage ( 20 ) running a drainage passage ( 30 ) is fluidly separated from the high pressure fluid system and has an open fluid port ( 31 ) for fluid communication with a low pressure fluid system. Block-shaped fluid line part ( 10 ) according to claim 1, wherein the drainage passage ( 30 ) parallel to the high-pressure fluid passage ( 20 ). Block-shaped fluid line part ( 10 ) according to claim 1 or 2, wherein the drainage passage ( 30 ) in the cross section of the high pressure fluid passage ( 20 ) seen on one the highest probability of cracking in the high-pressure fluid passage ( 20 ) having circumferential position of the high pressure fluid passage ( 20 ) is arranged. Block-shaped fluid line part ( 10 ) according to claim 3, wherein the fluid conduit part ( 10 ) in the cross section of the high pressure fluid passage ( 20 ) seen different wall thicknesses of the high pressure fluid passage ( 20 ) has circumferentially delimiting walls (W1, W2), and wherein the drainage passage ( 30 ) in the cross section of the high pressure fluid passage ( 20 ) seen on a circumferential position of a wall (W1) of the high pressure fluid passage ( 20 ) is arranged with the smallest wall thickness. Block-shaped fluid line part ( 10 ) according to one of claims 1 to 4, wherein the fluid conduit part ( 10 ) as a valve support for a high-pressure pump ( 1 ) is trained. Block-shaped fluid line part ( 10 ) according to any one of claims 1 to 4, wherein the fluid conduit part is formed as a manifold block for connecting a plurality of high pressure pipes of the high pressure fluid system. A common rail fuel system having a high pressure fluid system for providing high pressure fuel to an internal combustion engine, a low pressure fluid system for providing low pressure fuel to the high pressure fluid system, and a block shaped fluid conduit portion ( 10 ) according to one of claims 1 to 6, wherein the high-pressure fluid passage ( 20 ) of the fluid line part ( 10 ) is connected to the high-pressure fluid system and the drainage passage ( 30 ) of the fluid line part ( 10 ) is connected to the low pressure fluid system. Common rail fuel system according to claim 7, with a high-pressure pump ( 1 ) for generating the high pressure in the high-pressure fluid system, wherein the fluid conduit part ( 10 ) as a valve carrier of the high pressure pump ( 1 ) is trained. The common rail fuel system according to claim 7, wherein the high pressure fluid system comprises a plurality of high pressure pipes, and wherein the fluid pipe part is formed as a manifold block of the high pressure fluid system to which the high pressure pipes are connected.

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