CN1867762A

CN1867762A - Leak alarm for high-pressure pipe

Info

Publication number: CN1867762A
Application number: CNA2004800304482A
Authority: CN
Inventors: J·伦科宁
Original assignee: Wartsila Finland Oy
Current assignee: Wartsila Finland Oy
Priority date: 2003-10-17
Filing date: 2004-10-04
Publication date: 2006-11-22
Anticipated expiration: 2024-10-04
Also published as: FI119702B; KR101130388B1; FI20031522A0; ATE464471T1; EP1680592A1; WO2005038232A1; CN100430594C; KR20060095758A; EP1680592B1; DE602004026614D1; FI20031522A

Abstract

The present invention relates to a high-pressure system in combustion engines and particularly to leak alarms. The idea is to connect the leak flow space of the high-pressure pipe via a valve to an expansion space and furthermore, to measure the pressure in the leak flow space. The valve provides the operatively necessary limitation of the volume of the flow space for pressure measurement and at the same time it acts as a discharge passage for possible over-pressure and leak fuel. A direct passage out of the engine may act as an expansion space. Another option is to use the channel for continuous leak connected to the fuel recycle system as an expansion space.

Description

The leakage warning device that is used for high pressure pipe line

Invention field

The present invention relates to be used for the high pressure pipe line system of internal-combustion engine, the invention particularly relates to leakage warning device.

Background of invention

Many internal-combustion engines, especially large combustion machine, being equipped with can be for the mobile fuel line of high pressure fuel, and these pipelines are called high pressure pipe line usually.For example in diesel engine, fuel line can be arranged in another tubular sleeve usually, so that in outer sleeve, receive the fuel oil that may leak.When taking place to leak in the system, the fuel oil of leakage can flow out from diesel engine and flow in the outer field tubular sleeve.For example No. 0002385, European patent A and A have disclosed above-mentioned settling mode No. 0786593.

In order to survey the leakage in the related device, for instance, industry has been used various stoppers, surveys whether there is leakage by unclamping these stoppers.Another kind of method commonly used is to use detachable flexible pipe, also can survey whether there is leakage by taking these flexible pipes apart.Yet above-mentioned known method is more basic, use above-mentioned detection method find out the position of leakage can the expensive time and also workload also very big because flexible pipe and stopper need be unclamped in turn until finding the leak position.

Britain publication A has disclosed the device in a kind of fuel line of the double-layer tube wall that can be used for motor for No. 2060800.By this device, the fuel oil of leakage can be discharged from the flow channel that is formed by outer wall.According to the record of the disclosure patent, this device needs to be used and will to install outlet with the Injection Pump arm and links to each other with public discharge conduit.According to document specification, this device also has piston piece, and piston can be shifted so that the fuel oil that leaks can import in the discharge conduit by this device when leaking generation, and the cock body of this piston piece can be stretched the indication leakage simultaneously.Yet, this device especially can be had any problem when being applied to be equipped with the big-block engine of common rail storage injection, the fuel line system of this system is very huge, and has a lot of laterals.If adopt this disclosed solution, can cause this system to become so and disperse very much, so operation and maintenance all becomes very difficult.

A kind of more advanced fuel oil supply system has been shown among Fig. 1.Schematically illustrated among this figure and can be applicable to the especially part of the fuel oil supply system of large combustion machine of internal-combustion engine.The large combustion machine refers to for example can be applicable to the major and minor internal-combustion engine that is used to produce heat and/or electricity of boats and ships or power station.Usually, this large combustion machine is a diesel engine.More specifically, Figure 1 shows that a kind of example that is called the co-rail diesel machine.

For clarity sake, this internal-combustion engine very schematically illustrates and this internal-combustion engine can be a kind of known type.Than what illustrate in more detail mainly is cylinder 13 and cylinder head 12.In two cylinders 13 therein superposed piston 23 has been shown, fuel oil is delivered to each high-pressure service pump 4 by oil transfer pump 1 by fuel line 3 from fuel tank 2, and fuel oil is boosted to the required enough jet pressures of oil sprayer 11 in high-pressure service pump 4.High-pressure service pump 4 is communicated with pressure accumulater 6, and fuel oil is delivered to pressure accumulater 6 by high-pressure service pump 4, is delivered to oil sprayer 11 from pressure accumulater by fuel manifold 7 then.

Have some fuel oils continuing leakage from the nozzle 11 that is arranged in cylinder head 12, it can deliver to the lasting leakage way 15 that links to each other with the fuel oil reclaiming system through leakage pipe 14.The fuel oil that some normal leakages are also arranged at high-pressure service pump 4 places, it can deliver to leakage pipe 15 by leakage pipe 24.

Therefore, preferably include in the example of Fig. 1 fuel oil is delivered to pressure accumulater 6 and fuel oil are delivered to cylinder 13 again through oil sprayer 11 from pressure accumulater assembly of devices through high-pressure service pump 4.Each pressure accumulater 6 links to each other with at least two oil sprayers 11 and is equipped with oneself high-pressure service pump 4.High-pressure service pump 4 links to each other with pressure accumulater 6 by fuel delivery pipeline 5, and pressure accumulater 6 links to each other with oil sprayer 11 by fuel manifold 7, links to each other by fuel oil connecting tube 8 between the pressure accumulater 6.Therefore, above-mentioned at least fuel delivery pipeline 5, fuel manifold 7 and fuel oil connecting tube 8 are formed by the double walled pipe, and its outer flowing space 10 (being used to leak fuel oil) interconnects.Therefore, if fuel leakage has taken place in the somewhere in the system, the fuel oil that leaks can flow through the outer flowing space 10 and outlet flow channel 20 flow into leak in the fuel tanks 21 and with leakage indicator 22 that this leakages fuel tank 21 links to each other in, this leakage indicator 22 can be that liquid level sensor or optical sensor are used to refer to and leak whether full and detection leakage of fuel tank.The fuel oil that leaks can be discharged the leakage fuel tank 21 of motor by choke manifold 27, and actual fuel oil with elevated pressures flows in the internal layer flowing space 110.

Be leak indicator, above-mentioned fuel oil connecting tube 8 is provided with at least one fuel leakage sniffer 18, and this sniffer 18 can be connected with the outer flowing space 10 of pipe-line system by connecting pipeline 17.Fuel leakage sniffer 18 comprises some leakage recognition components, and can flow mutually by above-mentioned each the outer flowing space 10 of these leakage recognition components is communicated with or completely cuts off each other.Above-mentioned sniffer also is connected with outlet flow channel 20 by connecting pipeline 19.

As also illustrating among Fig. 1, the fuel oil connecting tube 8 that pressure accumulater 6 is linked to each other in fuel oil supply system also is provided with partition wall 9 or similar structure.By this partition wall 9, the outer flowing space 10 and supply system itself in the supply system are separated into the several separate part, there is shown two parts wherein.First portion comprises in the pressure accumulater one, the oil sprayer and the oil transfer pump that link to each other with pressure accumulater.Correspondingly, second portion comprises another pressure accumulater, the oil sprayer and the oil transfer pump that link to each other with this pressure accumulater.The outer flowing space 10 of two parts all links to each other with fuel leakage sniffer 18.In this case, the fuel leakage sniffer 18 that is arranged in the fuel oil connecting pipeline is always not necessary, but in some fuel oil supply system and in the motor, the location of fuel leakage is merely able to mainly measure by the fuel leakage sniffer that links to each other with pressure accumulater 6.

The part that is known as the engine thermal case has been described in the zone 25 that the with dashed lines frame goes out among Fig. 1.Therefore the figure shows the device that is placed in the hot case.

Fig. 2 is the sectional view of hot case.Hot case is the zone that is limited by lid 28 and engine body and other parts 29, and the lid zone has utilized the heat energy of motor generation.Can be opened since cover 28, the state of device just can be examined at an easy rate.For the reason of simplifying, fuel leakage sniffer 18 and necessary connecting pipeline 17,19 are only represented with pipeline 210 in Fig. 2.In addition, Fig. 2 is a principle schematic, therefore not with the device that might be placed in the hot case all illustrate.Fig. 3 is the external view of internal-combustion engine 31.Above-mentioned hot case is usually located at the upper edge of motor, and its lid 28 can be opened herein.

Fig. 4 shows the another kind of fuel leakage sniffer and uses.Fig. 4 with the mode detail display of example in the high

pressure pipe line

5,7 and 8 promptly in the location of the fuel leakage of the joint of high pressure pipe line (for example at cylinder head or pressure accumulater).Adopted in this embodiment the pin 41 that matches with the outer flowing space 10 of pressure accumulater 6, with the housing 42 and the spring-loaded ball 43 of pin 41 couplings.Spring-loaded ball 43 or analog by be located at pin 41 in and the groove or the similar structure (not shown) that cooperate with ball 43 or analog keep pin 41 in normal position.When fuel leakage occurs in pipeline 8 places (or other high pressure pipe lines, the outer flowing space 10 of this high pressure pipe line is communicated with pipeline 8 by individual passage shown in Figure 4), the pressure in the pressure space 44 of above-mentioned pin boss body begin to raise.By appropriate design to above-mentioned spring-loaded ball 43 or analog and groove or similar structure, can determine the pressure in the pressure space 44, this pressure makes pin 41 beginnings outwards move until position shown in Figure 4 in pin boss body 42.At this moment, the fuel oil of leakage can be discharged forward by passage 45, leaks indicating device 22 Shens up to flowing into.Therefore, selling 41 herein is as the action element of being arranged to cooperate with the wall body of pressure accumulater 6.Under the influence of leaking fuel pressure, pin can change with respect to the position of pressure accumulater, and based on the position of this pin with respect to pressure accumulater, and the fuel oil of leakage can import in the outer flowing space of fuel line and survey leakage.According to this embodiment's solution, even the fuel oil of leakage is not outside positioning stage can outflow system yet.Yet this leakage leans out the external indication of housing by pin.As can be seen from Figure 4, the use of pin makes the setting of system become complicated and with high costs.

One of problem that is associated with known solution also be to begin to leak and report to the police between retard time long.The quantity of fuel leakage is less than the volume of leakage way, and therefore reacting needs the cost quite a long time from beginning to leak to warning device (for example leak indicator elment and leak fuel tank).In addition, in some engine type, it is outer that the leakage way of high pressure pipe line is arranged at above-mentioned hot case, all needs to clear up pipeline after so each the warning, because the fuel oil that leaks has stopped up these pipelines.Quite general problem also is present in the leakage for high pressure pipe line, and throttling passage is incorrect usually with the adjustment of leaking case.

The invention summary

The objective of the invention is to eliminate above-mentioned the problems of the prior art of mentioning.This purpose realizes as described in the claim.Design of the present invention is: the leakage flow space of high pressure pipe line is communicated with the pressure that also can measure in this leakage flow space with extending space by valve.This valve for example is that safety check can be pressure measurement and provides the restriction in operational necessity of the volume of the flowing space, and can be used as possible excess pressure simultaneously and leak the exhaust port of fuel oil.

The direct access of external engine (as slot type structure or pipeline) can be used as extending space, and the fuel oil that may leak (also having produced simultaneously overvoltage) can enter the external world by this passage.In actual applications, also need to be used the leakage fuel oil trap that links to each other with the outlet of above-mentioned passage.Another optimal way is that the lasting leakage way that will link to each other with the fuel oil reclaiming system is as extending space.Adopt the benefit of this lasting leakage way to be: this lasting leakage way can be installed in the internal-combustion engine in advance, therefore is easy to just the leakage pipe that has valve to be arranged between high pressure pipe line and the normal leakage pipeline.The volume that the common formation of the combined volume in leakage pipe and leakage flow space can be limited by valve, but in this volume the pressure transducer measuring pressure.

Therefore, the invention relates to the device of the leakage that in internal-combustion engine, is used for high pressure pipe line, this device comprises at least one valve and at least one pressure transducer, leakage pipe is communicated with extending space by above-mentioned valve in this device, and pressure transducer is communicated with the common flowing space by the leakage pipe and the outer flowing space in this installs.

Description of drawings

Following with reference to description of drawings the present invention, in the accompanying drawing,

Fig. 1 is the schematic representation of an example that is used for the high pressure pipe line leakage device of prior art.

Fig. 2 is the sectional view of an example of device shown in Figure 1.

Fig. 3 is the external view of an example of internal-combustion engine.

Fig. 4 indicates the schematic representation of an example of pin for using fuel leakage.

Fig. 5 is the schematic representation of an example of device of the present invention.

Fig. 6 is the sectional view of an example of device shown in Figure 5.

Invention is described

Fig. 5 shows an example according to device of the present invention.This device is based on device shown in Figure 1, improves to be consistent with the present invention but done.In this example, the outer flowing space 10 of the high pressure pipe line 8 that links to each other with pressure accumulater 6 links to each other with the lasting leakage way 15 of internal-combustion engine by leakage pipe 53.This leakage pipe 53 is provided with valve 51, preferably adopts safety check.This valve 51 can limit the total volume of the outer flowing space 10 and the volume of the leakage pipe that links to each other with the outer flowing space 10.It should be noted that only that part of the leakage pipe volume between valve 51 and high pressure pipe line 8 is included in the above-mentioned limited total volume.

Pressure in this limited total volume is recorded by pressure transducer 52.This pressure transducer 52 preferably is provided with output terminal and transfers to for example control centre with the pressure data that will record.When taking place to leak in above-mentioned high pressure pipe line, the force value that is subjected to the above-mentioned volume of valve 51 restrictions can raise fast, and this moment, pressure transducer 52 can be reacted.Therefore, the delay between leakage and the warning has been shortened to greatest extent.

Be bled into the fuel oil in the outer flowing space 10, just leak fuel oil, can be by the valve of opening 51 enters in the lasting leakage way 15 because pressure raises.Therefore, above-mentioned valve 51 not only can provide confined volume (promptly by the leakage pipe and the outer flowing space 10 formed public flowing spaces), can also provide for the fuel oil that leaks to flow out the outer exhaust port of motor.This device also is equiped with pressure transducer.

As shown in Figure 5, high pressure pipe line 8 is divided into two independently volumes by dividing element 9 (partition wall).Pressure in first volume is measured by the pressure transducer 52 that links to each other with leakage pipe 53; Pressure in second volume is by measuring with the pressure transducer 52 that high pressure pipe line 8 directly links to each other.Therefore the structure of the system that is connected with the volume that is exposed to the measurement use is depended in the position of pressure transducer.Same, leakage pipe 53 also can be realized according to the mode that is suitable for using.For example leakage pipe can be the passage that bores or mill out.

The position of valve 51 also depends on the structure of system.If the length of leakage pipe is very short, then the position of valve 51 does not just have too many selectable space; If the length of leakage pipe is long, then the position of valve 51 just can be provided with relatively freely.Fig. 5 and Fig. 6 show that above-mentioned normal leakage pipe preferably is positioned at hot case inside.

Leakage pipe can also with (if being preferably one a) channel connection, it forms the path rapidly, as far as possible directly lead to external engine.Therefore, above-mentioned link to each other with the fuel oil reclaiming system of motor be used for leaking the lasting leakage way of fuel oil outside high pressure pipe line is discharged motor just unnecessary.Even leakage pipe self also can be formed with the passage that directly is communicated with external engine.Select above-mentioned which kind of structural framing to depend on the structure of system's remaining part.Yet, lasting leakage way all is installed in most motor, therefore always expect fuel oil being discharged outside the motor by this lasting leakage way.On the other hand, for preventing the pollution of the environment, the leakage fuel oil is directly derived the outer passage of motor, and preferably the trap of outer collection leakage fuel oil is used with being positioned at motor.Therefore, the conventional way of most of motor is to utilize existing lasting leakage way.

In an embodiment of the present invention, owing to adopted the normal leakage passage that is positioned at hot case inside, after reporting to the police, need not clean separately passage.The heat of hot case can make the leakage fuel flow in the passage unobstructed, therefore can not solidify.After leaking, leakage way is still in shape to be can be contingent next time leakage and gets ready.Therefore, advantageously operating element, pressure transducer and valve etc. all can be arranged at hot case inside.

Finished by pressure transducer owing to measure, therefore connected leakage fuel tank 21 and choke manifold 27 all are unnecessary.

The general maximum of pressure of the internal layer flowing space of high pressure pipe line is about 1600 crust (in CR formula motor), and therefore when pipeline broke, this pressure can be released in the outer flowing space 10 and finally enter leakage pipe 53, and this pressure also reduces thus.Because the rising of pressure, valve also can be opened and allow pressure be released into space outerpace.The said external space is referred to as extending space in this article.As can from as described in the conclusion that draws the embodiment, direct access that comes out from motor or the lasting leakage way that is connected with the engine fuel reclaiming system can be used as extending space.Other structural framing also it is contemplated that the extending space that is used for requirement.The influence that before realizing setting of the present invention, also needs to consider to leak the pressure in the fuel emission passage road, otherwise motor is easily damaged.

Because the pressure in the high pressure pipe line can enough fast speed be discharged in the enough big volume, the size of leakage pipe and other used passages can not produce any problem.Pressure transducer can be in the pressure gap work of following time of for example 0.1 crust, and valve 51 can be in the pressure gap work of following time of 0.2 crust.Therefore, before above-mentioned pressure of permission and leakage fuel oil entered extending space, the more reliable operation of pressure transducer 52 was activated.Certainly, pressure transducer and valve can also have other operating parameters.

Since no longer need independent channel system or driver in the engine construction of the present invention, therefore cost-saved.With Fig. 5 and Fig. 1 more as can be seen, the outlet flow channel of the device that in structural framing of the present invention, needn't have the leakage fuel oil sniffer 18 that has essential connecting pipeline 17,19, has requirement and leak case 21.The cost of pressure transducer and valve is lower than the cost of reduction.

Can also control unit be set separately for each cylinder of motor, therefore the combination of above-mentioned pressure transducer and valve can be connected to the oil sprayer pipeline of each cylinder, just carries the high pressure pipe line of fuel oil for cylinder.Pressure transducer and/or valve can also with link to each other with high pressure pipe line between the pressure accumulater at high-pressure service pump or link to each other with high pressure pipe line between pressure accumulater.

Therefore, the present invention has realized shorter delay and the low-cost configuration design between fuel leakage and the warning.In addition, owing to need not clean the leakage way system after the possible leakage, so the present invention has also reduced the needs of safeguarding and has increased reliability.

The embodiment of above-described fuel leakage sniffer is separate, but also can select several basic design according to different embodiment's operations in same motor.Can also make up different embodiments' operating principle within the scope of the invention.Above-mentioned motor can be model engine, joint-track type motor or other types motor.Motor can be the internal-combustion engine of any kind, is preferably diesel engine.

Therefore be clear that illustrating very much of technique scheme is exemplary, therefore the invention is not restricted to the foregoing description, but it is contemplated that out other some changes within the scope of the appended claims.

Claims

1. one kind is used for the device that high pressure pipe line leaks in internal-combustion engine, at high pressure pipe line described in this device is the fuel line of double-layer tube wall, the outer flowing space that it comprises the internal layer flowing space that is used for fuel oil and is used for possible leakage fuel oil, this device comprises the leakage pipe that at least one is communicated with the described outer flowing space and possible leakage fuel oil can be derived, it is characterized in that: this device comprises at least one pressure transducer and at least one valve, it is parts independently each other that described valve and described pressure pass the AZ sensor, in this device, described leakage pipe is connected with extending space by described valve, and in this device, described pressure transducer is connected with the common flowing space of the leakage pipe and the outer flowing space; In this case, because possible leakage fuel oil detects the unlatching that raises in the described common flowing space and/or just sending warning and execution valve in elevated pressure in described pressure transducer, the fuel oil that leaks is imported described extending space.

2. device as claimed in claim 1 is characterized in that: described extending space is formed by the lasting leakage way of motor, and this lasting leakage way is connected with the fuel oil reclaiming system of motor.

3. device as claimed in claim 1 is characterized in that: described extending space is formed by the passage of internal-combustion engine outside.

4. as claim 1 or 3 described devices, it is characterized in that: described leakage pipe, valve and pressure transducer all are positioned at hot case.

5. device as claimed in claim 2 is characterized in that: described leakage pipe, valve, pressure transducer and lasting leakage way all are positioned at hot case.

6. as claim 2 or 5 described devices, it is characterized in that: described lasting leakage way is communicated with described fuel oil reclaiming system by pipeline.

7. as each described device in the claim 1 to 6, it is characterized in that: described pressure transducer is provided with from the output terminal of described pressure transducer transmission measurement data.

8. as each described device in the claim 1 to 7, it is characterized in that: described pressure transducer and/or valve link to each other with the high pressure pipe line of supplying fuel oil for cylinder.

9. as each described device in the claim 1 to 7, it is characterized in that: described pressure transducer and/or valve link to each other with high pressure pipe line between high-pressure service pump and pressure accumulater.

10. as each described device in the claim 1 to 7, it is characterized in that: described pressure transducer and/or valve link to each other with high pressure pipe line between pressure accumulater.

11. as each described device in the claim 1 to 10, it is characterized in that: described valve is a safety check.

12. as each described device in the claim 1 to 11, it is characterized in that: described internal-combustion engine is the joint-track type motor.

13. as each described device in the claim 1 to 12, it is characterized in that: described internal-combustion engine is a diesel engine.