CN101493063A

CN101493063A - Fuel supply apparatus for internal combustion engine

Info

Publication number: CN101493063A
Application number: CNA2009100099641A
Authority: CN
Inventors: A·弗兰克; W·瓦格纳; S·克恩
Original assignee: MAN Diesel SE
Current assignee: MAN Energy Solutions SE
Priority date: 2008-01-26
Filing date: 2009-01-24
Publication date: 2009-07-29
Anticipated expiration: 2029-01-24
Also published as: FI20095045A; CN101493063B; KR101458225B1; KR20090082312A; FI20095045A0; DE102008006196A1; JP4981825B2; JP2009174535A; FI125666B; DE102008006196B4

Abstract

A fuel supply system for an internal combustion engine, having a low-pressure region, having a pump device with a high-pressure pump for delivering fuel from the low-pressure region into a high-pressure region, wherein a pressure accumulation system permanently under high pressure is provided between the pump device and an injector, which is connected to the pump device via a high-pressure fuel line permanently under high pressure, and is connected to the injector via a high-pressure fuel line which is sometimes under high pressure depending on the injection timing, wherein leaks occurring on the high-pressure fuel line and/or in the connection region thereof with the pump device, the pressure accumulation system and/or the injector are discharged via a leakage system. The leakage detection screw interacts with the high-pressure fuel line which is permanently under high pressure and the high-pressure fuel line which is sometimes under high pressure, i.e. a leakage occurring in the high-pressure fuel line and/or in the connection region thereof is guided by the leakage detection screw, so that the location of the occurring leakage can be determined without pressure or without pressure buildup without disassembling the high-pressure fuel line.

Description

The fuel facility of internal-combustion engine

Technical field

The present invention relates to a kind of preamble according to claim 1 the motor fuel supply equipment, be the common rail fuel supply equipment.

Background technique

DE 101 57 135 B4 disclose a kind of internal-combustion engine, promptly a kind of marine diesel oil internal-combustion engine that uses heavy oil work, and it has a plurality of cylinders, and wherein each cylinder all is equipped with the sparger of common rail fuel supply equipment.By these spargers can be in each cylinder of internal-combustion engine burner oil.Common rail fuel supply equipment according to DE 10,157 135 B4 comprises the pump-unit with a plurality of high-pressure service pumps, so that the area of low pressure of fuel from the common rail fuel supply equipment is transported to its high-pressure area, wherein in the high-pressure area, is being provided with the accumulation system that is in enduringly under the high pressure between pump-unit and the sparger.The accumulation system that is in enduringly under the high pressure is also referred to as common rail, and according to DE 101 57 135 B4, it has a plurality of unit that store, and is connected with pump-unit by the high-pressure fuel line that is in equally enduringly under the high pressure.Accumulation system is also by depending on that the high-pressure fuel line that the injection beat is under the high pressure sometimes is connected with sparger.The assembly of the high-pressure area of this common rail fuel supply equipment is subjected to high working pressure at work, and this working pressure for example can be for until 2000bar.The sealing that particularly is in the parts under the high pressure enduringly to the common rail fuel supply equipment has proposed high requirement thus.

This point is more suitable in the marine diesel oil internal-combustion engine, because the assembly of the common rail fuel supply equipment of marine diesel oil internal-combustion engine except high working pressure, also is subjected to other load, for example big vibration stress and big thermal stress.This particularly can cause the pipeline fracture in the zone of the high-pressure fuel line under being in high pressure enduringly, and then causes a large amount of leakages, described high-pressure fuel line to make the pump-unit of common rail fuel supply equipment be connected with accumulation system.Occur a large amount of leakages on the parts under the high pressure being in enduringly of common rail fuel supply equipment and can cause the pressure in the high-pressure area at fuel facility to drop to, can't be ejected into again in the cylinder of internal-combustion engine thus for opening below the needed cracking pressure of sparger.This causes the internal-combustion engine hard stop, for example can cause and can't handle for the boats and ships that have only an internal-combustion engine that has a this fuel facility thus.

In addition by known according to the prior art of EP 1 150 006 B1 and WO 2005/038232 A1, on the high-pressure fuel line of common rail fuel supply equipment and/or at high-pressure fuel line and pump-unit and/or with accumulation system and/or import at least one leakage with the leakage that join domain produced of sparger by leakage system and compile in the container, wherein the appearance of Guo Louing can detect by sensor.Although therefore can infer in principle to exist on fuel facility leaks, can't or to pay very big cost at all and could accurately determine the leak position or survey to leak the source.So need following fuel facility, promptly when occurring leaking, can utilize simple mechanism on this fuel facility, to determine the position of described leakage, and then can detect the leakage source.

Summary of the invention

Based on this, the objective of the invention is to, a kind of new-type motor fuel supply equipment is proposed, promptly a kind of new-type common rail fuel supply equipment.This purpose is achieved by the fuel facility according to claim 1.According to the present invention, at least one leak detection screw mechanism preferably is in high-pressure fuel line mating reaction under the high pressure with each respectively enduringly, and preferably be in fuel conduit mating reaction under the high pressure sometimes with each, its mode is, on the high-pressure fuel line and/or the leakage that is occurred in the join domain at this high-pressure fuel line can guide by leak detection screw mechanism with corresponding high-pressure fuel line mating reaction so that need not to dismantle the position of the leakage that high-pressure fuel line can not have pressure ground or do not determine under the situation of build-up pressure to be occurred in leakage system.

Fuel facility of the present invention has following advantage, when promptly occurring leaking on this fuel facility, can utilize simple mechanism to determine the position of described leakage, therefore can easily detect and leak the source.This puts no pressure ground and then does not realize under the situation of build-up pressure in leakage system.Leak the source and can utilize simple mechanism to be defined apace, can promptly eliminate the blow-by in the high-pressure area of fuel facility thus by the leak detection screw mechanism.Employed leak detection screw mechanism is durable, with low cost and can repeatedly use in fuel facility of the present invention.

According to a kind of useful improvement of the present invention, each leak detection screw mechanism all set to high-pressure fuel line and pump-unit and/or with accumulation system and/or with the join domain of sparger, its mode is, each leak detection screw mechanism is positioned in the following hole, and promptly this hole is inserted in pump-unit and/or accumulation system and/or the sparger adjacent to join domain and is passed at least one leakage line of leakage system.

Each leak detection screw mechanism all has wall, this wall limits the inner chamber of leak detection screw mechanism, and have at least one opening radially, leakage can flow in the inner chamber of leak detection screw mechanism and/or flows out from the inner chamber of leak detection screw mechanism by described opening.The wall of each leak detection screw mechanism is defined as annular chamber with the hole at this leak detection screw mechanism place, wherein leak and at first enter into this annular chamber, and when surpassing the leakage rate of regulation or enter into the inner chamber of corresponding leak detection screw mechanism afterwards from annular chamber, thereby when surpassing the leakage rate of regulation or leak afterwards and collect in the part chamber of inner chamber, wherein other leakage can not have the derivation of pressure ground being full of this part chamber fully after.When determining the leak position, each leak detection screw mechanism is back-outed from corresponding hole, wherein be arranged in or when collecting in the part chamber of inner chamber of leak detection screw mechanism, will infer on corresponding high-pressure fuel line and/or to occur leaking at corresponding join domain when leaking.

Description of drawings

Preferred improvement of the present invention can be obtained by dependent claims and following explanation.Embodiments of the invention will contrast accompanying drawing and describe in detail, but be not limited to these embodiments.Shown in the figure:

Fig. 1 is the Block Diagram of motor fuel supply equipment of the present invention;

Fig. 2 is the Block Diagram that substitutes of motor fuel supply equipment of the present invention; With

Fig. 3 is another Block Diagram that substitutes of motor fuel supply equipment of the present invention;

Fig. 4 is the partial sectional view according to the fuel facility according to Fig. 1 or 2 or 3 of the present invention of first modification of the present invention; With

Fig. 5 is the partial sectional view according to the motor fuel supply equipment of the present invention of second modification of the present invention.

Embodiment

The present invention this relate to a kind of internal-combustion engine, particularly use the common rail fuel supply equipment of the marine diesel oil internal-combustion engine of heavy oil work.The common rail fuel supply equipment has area of low pressure and high-pressure area.The high-pressure area of common rail fuel supply equipment comprises the pump-unit with at least one high-pressure service pump and has the accumulation system that at least one stores the unit that wherein pump-unit is connected by at least one high-pressure fuel line with accumulation system.Accumulation system and described or each high-pressure fuel line that makes accumulation system be connected with pump-unit are under the high working pressure enduringly, and this working pressure can be for until 2000bar.Fuel can be injected to the cylinder by sparger from accumulation system, and wherein each sparger is connected by at least one high-pressure fuel line with accumulation system, and this high-pressure fuel line depends on that the injection beat of internal-combustion engine is under the high pressure sometimes.

First end that is in the high-pressure fuel line under the high pressure enduringly is connected with accumulation system, and its second end is connected with pump-unit.In the zone of first end, be configured with the join domain between high-pressure fuel line and accumulation system.In the zone of second end, be configured with the join domain between high-pressure fuel line and pump-unit.Depend on that spraying first end that beat is in the fuel conduit under the high pressure sometimes is connected with accumulation system, its second end is connected with sparger, wherein is configured with the join domain between high-pressure fuel line and accumulation system or sparger in the zone at two ends again.

When accumulation system comprises a plurality of when storing the unit, these store the unit by being in the mutual lotus root connection of high-pressure fuel line under the high pressure enduringly, wherein in two end regions of this high-pressure fuel line, also be configured with join domain, promptly at the join domain between the unit of storing of high-pressure fuel line and accumulation system.

In the zone of whole high-pressure fuel lines, and high-pressure fuel line and pump-unit and/or with accumulation system and/or with whole join domains of sparger in, can produce leak, wherein this leakage can compile in the container by at least one leakage that leakage system imports to this leakage system.

Fig. 1 is the very schematically Block Diagram of common rail fuel supply equipment of the present invention, the possible leak of wherein representing fuel facility with piece 1 to 12, wherein leak 1 to 12 can be high-pressure fuel line and be high-pressure fuel line and pump-unit with accumulation system or with the join domain of sparger.The leakage that occurs in the zone of leak 1 to 12 can import to leak and compile in the container 13, and wherein in the illustrated embodiment of Fig. 1, per four possible leak are compiled container 13 by

common leakage line

14 or 15 or 16 with leakage and are connected.

According to Fig. 1, each leak detection screw mechanism (Schraube) 17 or 17 ' with each possible leak 1 to 12 mating reaction, promptly depend on that with each the injection beat is in the fuel conduit mating reaction under the high pressure sometimes with each high-pressure fuel line that is in enduringly under the high pressure, perhaps with high-pressure fuel line and pump-unit or with accumulation system or with each join domain mating reaction of sparger, the i.e. leakage that therefore on high-pressure fuel line and/or at the join domain of this high-pressure fuel line, occurs in a possible leak 1 to 12 can by with the leak

detection screw mechanism

17 or 17 of corresponding leak 1 to 12 mating reaction ' guide, high-pressure fuel line can not have pressure ground or determine the leak position under the situation of build-up pressure in leakage system so that need not to dismantle, and therefore detects the leakage source.

If therefore compile to recognize in the container 13 in leakage in the embodiment in figure 1 and leakage occurred, then can pass through leak detection screw mechanism 17 or 17 ' without doubt and simply in the of short duration time, promptly not have pressure ground or in leakage system, will not leak corresponding to each possible leak 1 to 12 under the situation of build-up pressure.

Fig. 2 is the Block Diagram of fuel facility, wherein not only gives possible leak 1 to 12, and return or rather

leakage line

14,15 and 16 set respectively leak

detection screw mechanism

17 or 17 '.This has following advantage, promptly detects in the container 13 when leaking when compiling in leakage, at first can be by setting leak

detection screw mechanism

17 or 17 to

leakage line

14,15 and 16 ' will leak corresponding to one group of possible leak.If for example by to set leak

detection screw mechanism

17 or 17 to leakage line 14 ' analysis determine that this leakage line 14 does not have and leak, then needn't check subsequently by leakage line 14 and compile the possible leak 1 to 4 that container 13 is connected with leakage.Can locate fast determined leakage thus.In the embodiments of figure 3, set leak

detection screw mechanism

17 or 17 to

leakage line

14,15 and 16 ' replaced by sensor 18, these sensors are preferably based on capacitive measuring principle.By sensor 18, as in the embodiment of Fig. 2, utilize leak detection screw mechanism 17 or 17 ', can in the zone of

leakage line

14,15 and 16, limit possible leakage source in advance.

Below the attached Figure 4 and 5 of contrast describe in detail leak detection screw mechanism 17 or 17 ' details, the leak position is determined under the situation of build-up pressure in described leak detection screw mechanism 17 or 17 ' can realize not having pressure ground in leakage system, wherein Figure 4 and 5 illustrate leak detection screw mechanism 17 or 17 ' two modification.

Therefore Fig. 4 is the partial sectional view in the zone of the high-pressure fuel line 19 of common rail fuel supply equipment of the present invention under being in high pressure enduringly, wherein the end of the high-pressure fuel line shown in Fig. 4 19 by link 20 and pressure piece 21 together the accumulation system 22 of rail fuel facility be connected.High-pressure fuel line 19 has pressure tube 23 and foreskin 24, wherein forms the fluid passage between foreskin 24 and pressure tube 23, and this fluid passage is used to guide a spot of fuel leak under the situation that pressure tube 23 does not rupture in the proper functioning of fuel facility.

According to Fig. 4, an end of the pressure tube 23 of high-pressure fuel line 19 presses against on the conical seat 25 of accumulation system 22.With respect to link 20 sealings, wherein Sealing 26 is between the foreskin 24 of link 20 and high-pressure fuel line 19 by Sealing 26 for high-pressure fuel line 19.Another Sealing 27 between link 20 and accumulation system 22 recessed, link 20 extend into this recessed in.

Therefore Fig. 4 shows the join domain of high-pressure fuel line 19 and accumulation system 22.Adopt similar mode can be configured in the pump-unit of high-pressure fuel line and fuel facility and the join domain between the sparger.

Leak and in the zone of conical seat 25, occurring on the high-pressure fuel line 19 usually, wherein the leakage that occurs in the zone of conical seat 25 can collect in the cavity 28, and derived by

leakage line

29,30 and 31, described cavity surrounds high-pressure fuel line 19 in the zone of conical seat 25.Leakage can be flowed to leak detection screw mechanism 17 with high-pressure fuel line 19 mating reactions by leakage line 29.According to Fig. 4, leak detection screw mechanism 17 is arranged in hole 32, this hole extend in the accumulation system 22 adjacent to high-pressure fuel line 19 join domain with accumulation system 22, and wherein leakage line 29 still is that leakage line 30 all is connected with hole 32 or leads in the hole 32.

According to Fig. 4, leak detection screw mechanism 17 has wall 33, and this wall limits the inner chamber 34 of leak detection screw mechanism 17 on the one hand, limits annular chamber 35 with hole 32 on the other hand when leak detection screw mechanism 17 is inserted in the hole 32, according to Fig. 4, this annular chamber surrounds inner chamber 34.According to Fig. 4, on wall 33, offer a plurality of

openings

36 and 37 radially, the inner chamber 34 of leak detection screw mechanism 17 is communicated with annular chamber 35 by these openings.In the embodiment of Fig. 4, give the wall 33 of leak detection screw mechanism 17 be equipped with radial ring around band (Bund) 38, this band and is divided into annular chamber 35 annular chamber half one on top and annular chamber half one of bottom when leak detection screw mechanism 17 is inserted in the hole 32 fully between opening 36 and 37 radially.Leakage line 29 is passed in the hole 32 in the zone of annular chamber half one on top, and on the contrary, leakage line 30 is passed in the hole 32 in the zone of annular chamber half one of bottom.The radial opening 36 of wall 33 makes annular chamber half one on top be communicated with the inner chamber 34 of leak detection screw mechanism 17, and the radial opening 37 of wall 33 makes annular chamber half one of bottom be communicated with the inner chamber 34 of leak detection screw mechanism 17.

When on the high-pressure fuel line 19 or when leaking appears in the join domain of high-pressure fuel line 19 and accumulation system 22, this leakage imports in the annular chamber 35 by leakage line 29, promptly import in annular chamber half one on top, wherein when the leakage in the zone of annular chamber half one that collects in top surpasses the leakage rate of regulation, leak the inner chamber 34 that enters into leak detection screw mechanism 17 from annular chamber half one on top by radial opening 36.By same mode, the leakage that enters into inner chamber 34 collects in the part chamber 39 of inner chamber 34, wherein when the part chamber 39 of inner chamber 34 is full of leakage fully, other leakage is left inner chamber 34 by radial opening 37, and enter into annular chamber half one of the bottom of annular chamber 35, derived by leakage line 30 at last.

When check with the fuel conduit 19 of leak detection screw mechanism 17 mating reactions on when whether occurring leaking, only need leak detection screw mechanism 17 32 is back-outed from the hole, and observe the inner chamber 34 of leak detection screw mechanisms 17 by radial opening 36 or 37.If can see in this case in inner chamber 34, promptly in the part chamber 39 of this inner chamber, compile leakage is arranged, then can infer the join domain blow-by of high-pressure fuel line 19 blow-by or this high-pressure fuel line and accumulation system 22.On the contrary, if in inner chamber 34, do not leak, then can infer high-pressure fuel line 19 sealings or its corresponding join domain sealing.This leak detection screw mechanism 17 of cleaning before being screwed into leak detection screw mechanism 17 in the hole 32 again.

As seen from Figure 4, cavity 28 directly is communicated with leakage line 30 by leakage line 31, and wherein the diameter of leakage line 31 is less than leakage line 29, and this leakage line 29 makes cavity 28 be communicated with the hole 32 that holds leak detection screw mechanism 17.

By leakage line 31, leakage can be derived with a spot of volume flowrate, and can not be guided through leak detection screw mechanism 17.Misinterpret can be prevented thus, when leak detection screw mechanism 17 is filled by negligible small leakage, described misinterpret can be produced.

According to Fig. 4, the inner chamber 34 of leak detection screw mechanism 17 is closed by expender (Expander) 40 in the upper end.Equally, leakage line 29 is closed by expender 41 in unwanted end.

Fig. 5 illustrate the leak detection screw mechanism 17 of fuel facility of the present invention ' a kind of alternative mode of execution, wherein leak detection screw mechanism 17 ' extend into equally hole 32 ' in, according to Fig. 5, this hole 32 ' extend into again in the accumulation system 22.Hole 32 ' with leakage line 29 ' and 30 ' is communicated with, wherein leakage line 29 ' with 30 ' be passed into hole 32 ' in.

The leak detection screw mechanism 17 of Fig. 5 ' also have wall 33 ', this wall 33 ' one side limit leak detection screw mechanism 17 ' inner chamber 34 ', on the other hand with hole 32 ' limit annular chamber 35 ', this annular chamber 35 ' encirclement leak detection screw mechanism 17 ' inner chamber 34 '.By leak detection screw mechanism 17 ' wall 33 ' on offer opening radially 36 ', inner chamber 34 ' with annular chamber 35 ' be communicated with.

In Fig. 5 in the zone of unshowned high-pressure fuel line 19 or the leakage that in the join domain of this high-pressure fuel line and accumulation system 22, is occurred can by leakage line 29 ' flow to leak detection screw mechanism 17 ', wherein this leakage at first collect in annular chamber 35 ' in.

When collect in annular chamber 35 ' in leakage when surpassing the leakage rate of regulation, leak by radial opening 36 ' enter into leak detection screw mechanism 17 ' inner chamber 34 ', and collect in inner chamber 34 ' the bottom part chamber 39 ' in.When inner chamber 34 ' part chamber 39 ' be full of fully when leaking, other leak do not enter into leak detection screw mechanism 17 ' inner chamber 34 ', more precisely, annular chamber 35 ' in other leak and rise, leak by leakage line 30 ' derivation until this.

In the embodiment of Fig. 5, leak detection screw mechanism 17 ' have stopper 42 in the lower end ', when leak detection screw mechanism 17 ' be inserted into fully hole 32 ' middle, this stopper is with leakage line 43 ' sealing.Alternatively, also can stopper 42 ' and leakage line 43 ' between remain with little sky and stay the chamber, thereby a spot of leakage can flow out, rather than enter into leak detection screw mechanism 17 ' inner chamber 34 '.With leak detection screw mechanism 17 ' from hole 32 ' back-out after, stopper 42 ' will pass to leakage line 43 ' communication passage open fully, thereby collect in hole 32 ' or annular chamber 35 ' in leakage can flow out fully.

Two embodiments' of Figure 4 and 5 something in common is, leakage be fed to leak detection screw mechanism 17 or 17 ', wherein when leaking the amount that surpasses regulation, this leakage just enter into leak detection screw mechanism 17 or 17 ' inner chamber 34 or 34 ', and collect in leak detection screw mechanism 17 or 17 ' inner chamber 34 or 34 ' part chamber 39 or 39 ' in, or rather, until this part chamber 39 or 39 ' be full of fully.Exceed the leakage of overflowing in described part chamber and be not collect in leak detection screw mechanism 17 or 17 ' inner chamber 34 or 34 ' in, or rather, other leaks no pressure ground and passes through leakage line 30 or 30 ' derivation.Leak detection therefore do not have pressure ground leak

detection screw mechanism

17 or 17 accordingly ' in do not realize under the situation of build-up pressure.

Reference numerals list

1 leak

2 leak

3 leak

4 leak

5 leak

6 leak

7 leak

8 leak

9 leak

10 leak

11 leak

12 leak

13 leakages compile container

14 leakage lines

15 leakage lines

16 leakage lines

17,17 ' leak detection screw mechanism

18 sensors

19 high-pressure fuel lines

20 links

21 pressure pieces

22 accumulation systems

23 pressure tubes

24 foreskins

25 conical seats

26 Sealings

27 Sealings

28 cavitys

29,29 ' leakage line

30,30 ' leakage line

31 leakage lines

32,32 ' hole

33,33 ' wall

34,34 ' inner chamber

35,35 ' annular chamber

36,36 ' opening

37 openings

38 bands

39,39 ' part chamber

40,40 ' expender

41 expender

42 ' stopper

43 ' leakage line

Claims

1. an internal-combustion engine, the fuel facility of marine diesel oil internal-combustion engine particularly, it is the common rail fuel supply equipment, has the area of low pressure, and has the pump-unit that comprises at least one high-pressure service pump, so that the area of low pressure of fuel from described fuel facility is transported to the high-pressure area of described fuel facility, wherein in described high-pressure area at described pump-unit and set be provided with between the sparger to cylinder have that at least one stores the unit be in accumulation system under the high pressure enduringly, wherein said accumulation system is connected with described pump-unit by the high-pressure fuel line that at least one is under the high pressure equally enduringly, wherein said accumulation system is connected with described sparger by depending on the high-pressure fuel line that the injection beat is under the high pressure sometimes, wherein on the described high-pressure fuel line and/or described high-pressure fuel line and described pump-unit and/or with described accumulation system and/or with the join domain of described sparger in the leakage that produced can derive by leakage system, it is characterized in that, at least one leak detection screw mechanism (17,17 ') preferred be in high-pressure fuel line (19) mating reaction under the high pressure enduringly with each respectively, and preferably be in high-pressure fuel line (19) mating reaction under the high pressure sometimes with each, its mode is, on the high-pressure fuel line and/or the leakage that is occurred in the join domain at this high-pressure fuel line can by with the described leak detection screw mechanism (17 of corresponding high-pressure fuel line mating reaction, 17 ') guide, high-pressure fuel line (19) can not have pressure ground or the position of the leakage determining to be occurred under the situation of build-up pressure not so that need not to dismantle.

2. fuel facility as claimed in claim 1, it is characterized in that, a unique leak detection screw mechanism (17,17 ') respectively with each be in enduringly under the high pressure, make the high-pressure fuel line mating reaction that described accumulation system is connected with described pump-unit.

3. fuel facility as claimed in claim 1 or 2, it is characterized in that, leak detection screw mechanism (17,17 ') respectively with each depend on spray beat be in sometimes under the high pressure, make the high-pressure fuel line mating reaction that described accumulation system is connected with described pump-unit.

4. as each described fuel facility in the claim 1 to 3, it is characterized in that leak detection screw mechanism (17,17 ') is in the different high-pressure fuel line mating reaction that stores the unit connection under the high pressure, that make described accumulation system enduringly with each respectively.

5. as each described fuel facility in the claim 1 to 4, it is characterized in that, each leak detection screw mechanism (17,17 ') all corresponding to high-pressure fuel line and described pump-unit and/or with described accumulation system and/or with the join domain of described sparger, its mode is, each leak detection screw mechanism all is positioned at following hole (32,32 ') in, promptly this hole is inserted in described pump-unit and/or described accumulation system and/or the described sparger adjacent to described join domain and is passed at least one leakage line (29 of described leakage system, 30,29 ', 30 ') in.

6. as each described fuel facility in the claim 1 to 5, it is characterized in that, each leak detection screw mechanism (17,17 ') all has wall (33,33 '), described wall limits the inner chamber (34,34 ') of described leak detection screw mechanism (17,17 '), and have at least one opening (36,37,36 ') radially, leakage can flow in the inner chamber of described leak detection screw mechanism and/or flows out from the inner chamber of described leak detection screw mechanism by described opening.

7. fuel facility as claimed in claim 6, it is characterized in that, when determining the leak position, leak detection screw mechanism (17,17 ') can be back-outed from corresponding hole (32,32 '), wherein when leakage is arranged in or collects in the part chamber (39,39 ') of the inner chamber of described leak detection screw mechanism, will infer on corresponding high-pressure fuel line and/or to occur leaking at corresponding join domain.

8. fuel facility as claimed in claim 7, it is characterized in that, each leak detection screw mechanism (17,17 ') wall (33,33 ') and described hole (32,32 ') be defined as annular chamber (35 together, 35 '), wherein leak and at first enter into described annular chamber (35,35 ') in, and when surpassing the leakage rate of regulation or enter into corresponding leak detection screw mechanism (17 from described annular chamber afterwards, 17 ') inner chamber (34,34 ') in, thereby when surpassing the leakage rate of described regulation or leak the part chamber (39 that collects in described inner chamber afterwards, 39 ') in, wherein other leakage can not have the derivation of pressure ground after being full of described part chamber fully.

9. as each described fuel facility in the claim 1 to 8, it is characterized in that, common leak detection screw mechanism additionally with a plurality of high-pressure fuel line mating reactions, described high-pressure fuel line compiles container by common leakage line (14,15,16) with leakage and is connected.

10. as each described fuel facility in the claim 1 to 8, it is characterized in that, common leak detection sensor (18) additionally with a plurality of high-pressure fuel line mating reactions, described high-pressure fuel line compiles container by common leakage line (14,15,16) with leakage and is connected.