CN100416078C - Liquefied gas-delivering device for diesel engine - Google Patents

Abstract

Since an aspirator 7 is disposed at a position lower than a fuel gallery 11 and an overflow fuel pipe 81, DME fuel remaining in the fuel gallery 11 and the overflow fuel pipe 81 can be more efficiently retrieved to a fuel tank 4 by a combined force of gravity and suction force produced in a suction port 7c of the aspirator 7. Since the vapor-phase pressure delivery pipe opening/closing solenoid valve 74 is disposed at a position higher than the fuel gallery 11, DME fuel in a liquid state remaining in the fuel gallery 11 and the overflow fuel pipe 81 is forcedly delivered under pressure to the suction port 7c of the aspirator 7 by a combined force of gravity and the pressure of a vapor phase 4b in the fuel tank 4. Accordingly, time taken to retrieve the DME fuel in an injection system to the fuel tank after the stop of a diesel engine gets shorter.

Description

The liquefied gas-delivering device that is used for diesel engine

Technical field

The present invention relates to a kind of liquefied gas-delivering device that is used for diesel engine, its LP gas liquid gas such as (after this being called " high cetane number LP gas ") that uses DME (dimethyl ether) or be added with cetane additive acts as a fuel.

Background technique

Reduce measure as the atmospheric pollution that is used for diesel engine, use clean fuel, rather than the diesel engine of light oil arouses attention as DME (dimethyl ether) and high cetane number LP gas.These fuel are the liquid gas that are different from as the light oil of traditional fuel.That is, liquefied gas as fuel has the low-boiling boiling point than light oil, and has the characteristic of vaporization at room temperature, and light oil exists as a kind of liquid under room temperature and atmospheric pressure.Owing to this reason, in the diesel engine that uses liquefied gas as fuel, after diesel engine stops, the liquefied gas as fuel that remains in the ejecting system partly leaks into the cylinder of diesel engine and vaporizes in cylinder from the nozzle carrier of fuel nozzle, and described ejecting system is the fuel feed line part of guiding fuel nozzle.As a result, the DME fuel of vaporization is charged in the cylinder, and when diesel engine will the danger as malcombustions such as pinkings can occur when starting next time, and diesel engine can not be by normal starting, and big vibration and noise can occur.

An example as the correlation technique that addresses this is that, (for example there is following a kind of ejecting system, Japan Patent No.3111254), this system comprises at least one heating equipment and is used to form the mechanism that is connected, after fuel supplying device (for example jet pump) stops, described connection allow a kind of at ejecting system at least one pressure guide portion and fuel tank between flow.Described ejecting system forms between at least one the pressure guide portion of ejecting system and fuel tank after fuel supplying device stops and connecting; At least a portion of heated pressure guide portion is to convert residual liquefied gas as fuel such as DME vapour phase to and to produce an air-flow; And be pressed onto in the fuel tank by the residual liquid butane fuel of described air-flow with the pressure guide portion.In addition, (for example there is a kind of diesel fuel system, JP-A-11-107871), it detects three pressure parameters: atmospheric pressure, fuel tank internal pressure and fuel return pipe internal pressure, and utilize the pressure reduction between these pressure that residual liquefied gas as fuel is recovered in the fuel tank.

In above-mentioned each correlation technique, as after fuel supplying device stops, will remaining in liquefied gas as fuel in the pressure guide portion and be recovered to mechanism in the fuel tank, not only must comprise mechanism, and must comprise the pressure transducer (JP-A-11-107871) that at least one heating equipment (Japan Patent No.3111254) or detects the fuel return pipe internal pressure by switching pipe path such as solenoid valves.Therefore, in the fuel supply system of diesel engine, have following risk, the mechanism that promptly is used for reclaiming residual fuel after fuel supplying device stops to become expensive, and this becomes the main cause that increases the fuel supply system cost.

The applicant had proposed a kind of liquefied gas fuel supply device in the past, this device comprises and is used for by aspirating mechanism the residual liquid butane fuel being recovered to the mechanism of fuel tank, described aspirating mechanism with aspirator as after fuel supplying device stops, being recovered to mechanism (application number 2002-60829) in the fuel tank remaining in liquefied gas as fuel in the ejecting system.Be used for forming a liquefied gas as fuel annularly flow that comprises aspirator in the following manner by this mechanism that aspirator reclaims residual fuel, promptly, in initial the use with supply pump as driving source from fuel tank transportation of liquefied gas fuel, and the suction force suction of this mechanism by being produced in the aspirator by being flowing in of liquid gas remain in the liquefied gas as fuel in the ejecting system, thereby the residual liquid butane fuel is recovered in the fuel tank.That is to say, the liquefied gas as fuel that remains in the ejecting system can only reclaim by following mechanism, described mechanism forms the liquefied gas as fuel annularly flow by aspirator and supply pump, thereby not needing provides heating equipment, pressure transducer etc., just can reclaim the liquefied gas as fuel that remains in the ejecting system after fuel supplying device stops.Therefore, can construct the residual fuel recovering mechanism with low cost.

But, the inventor has carried out further further investigation, find if the liquefied gas as fuel that remains in the liquefied gas fuel supply device after by the aspirating mechanism that uses aspirator diesel engine being stopped to be drawn in the fuel tank all liquefied gas as fuel that then need considerable time to aspirate to remain in the ejecting system.This is because compare with the pump with driving source etc., the suction force that aspirator produced that does not have a driving source a little less than.The result, need reclaim the liquefied gas as fuel in the ejecting system that remains in liquefied gas fuel supply device the time to a certain degree, and, if stopping the back in short-term at it, started once more by diesel engine, although all liquefied gas as fuel that then remain in the ejecting system of liquefied gas fuel supply device also reclaim, diesel engine is still started once more, therefore has the danger that occurs as the malcombustion of pinking.

In addition, when diesel engine was started after it stops once more, liquefied gas as fuel need be charged into before diesel engine starting in the ejecting system of liquid gas supplier.Therefore, during liquefied gas as fuel is charged into the ejecting system of liquefied gas fuel supply device, the fail to start diesel engine.In addition, owing to need the long time liquefied gas as fuel to be charged in the ejecting system of liquefied gas fuel supply device, therefore have following problems, that is, when diesel engine and liquefied gas fuel supply device stopped, diesel engine can not be started rapidly.

Summary of the invention

The present invention is exactly in view of the above problems and proposes, and an object of the present invention is to reduce in the liquefied gas fuel supply device of diesel engine, the time that is recovered to the liquefied gas as fuel in the ejecting system in the fuel tank after diesel engine stops to be spent.

Another object of the present invention is to reduce in the liquefied gas fuel supply device of diesel engine, when diesel engine starting liquefied gas as fuel is charged into the time required the ejecting system from fuel tank.

To achieve these goals, a first aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine, it is characterized in that comprising: a fuel tank is used for the storage liquid butane fuel; A jet pump is used for liquefied gas as fuel is transported to the fuel nozzle of diesel engine; Fuel supply mechanism is used for liquefied gas as fuel is transported to jet pump from fuel tank; With the residual fuel recovering mechanism, be used for after diesel engine stops, the liquefied gas as fuel that remains in the jet pump is recovered in the fuel tank.Described residual fuel recovering mechanism is so constructed, to cause the forced refluence circulation of liquefied gas as fuel in the fuel tank, so that make liquefied gas as fuel turn back in the fuel tank once more by aspirator, and the liquefied gas as fuel that will remain in the jet pump by the suction force that is produced in the pump port of aspirator by pump circulation is recovered in the fuel tank, and the pump port of aspirator is arranged on than the regional low position in the residual jet pump that liquefied gas as fuel arranged wherein.

According to the present invention, the pump port of aspirator is arranged on than the regional low position in the residual jet pump of liquefied gas as fuel.That is, liquefied gas fuel supply device being stopped the back residually has the fuel channel of liquefied gas as fuel and the zone in the overflow fuel pipe to be arranged on the position higher than the pump port of aspirator.Therefore, the associating power that remains in the suction force that the liquefied gas as fuel in the described zone produced by the circulation of gravity and liquefied gas as fuel is recovered in the fuel tank, thereby can more effectively utilize gravity to reclaim the liquefied gas as fuel that remains in the ejecting system.Therefore, can obtain following effect and advantage, that is, reduce after diesel engine stops the liquefied gas as fuel in the ejecting system is recovered to the time required in the fuel tank.

A second aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine, it is characterized in that comprising: a supply pump is used for the liquefied gas as fuel of fuel tank is pressurized to predetermined pressure and described liquefied gas as fuel is transported to a supplying pipe; A jet pump is used for predetermined amount the liquefied gas as fuel of fuel channel being flowed to the nozzle of diesel engine in predetermined timing, and wherein the liquefied gas as fuel of carrying through supplying pipe flows in the described fuel channel; An overflow fuel pipe is used to make the liquefied gas as fuel that overflows from jet pump to turn back to fuel tank; With the residual fuel recovering mechanism, be used for after diesel engine stops, the liquefied gas as fuel that remains in fuel channel and the overflow fuel pipe is recovered in the fuel tank.Described residual fuel recovering mechanism has: a fuel cycle pipe, and it is from the midpoint branch of supplying pipe and be connected on the fuel tank; Supplying pipe opening/closing mechanism, it is along being arranged in the supplying pipe on downstream one side of the supply pump of liquefied gas as fuel flow direction, and work is to open and close the flow channel of supplying pipe; With an aspirator, it is arranged in the fuel cycle pipe and has a pump port that is communicated with fuel channel and/or overflow fuel pipe.Described residual fuel recovering mechanism is so constructed, with by close supplying pipe opening/closing mechanism, cutting off under the condition of supplying of jet pump, will be recycled to from the liquefied gas as fuel that supply pump is carried the fuel tank through supplying pipe, fuel cycle pipe and aspirator; And the liquefied gas as fuel that will remain in fuel channel and the overflow fuel pipe by the suction force that produces in the pump port of aspirator based on described circulation aspirates, is recovered in the fuel tank.

In this mode, the pump port of aspirator is set at than fuel channel and the low position of overflow fuel pipe, wherein produces suction force by the circulation of liquefied gas as fuel in described pump port.That is, residual after liquefied gas fuel supply device stops to have the fuel channel of liquefied gas as fuel and overflow fuel pipe to be set at the position higher than the pump port of aspirator.Therefore, the associating power that remains in the suction force that the liquefied gas as fuel in fuel channel and the overflow fuel pipe produced by the circulation of gravity and liquefied gas as fuel is recovered in the fuel tank, thereby can more effectively utilize gravity to reclaim the liquefied gas as fuel that remains in the ejecting system.Therefore, can obtain following effect and advantage, that is, after reducing diesel engine and stopping with the required time in the fuel tank of the DME fuel recovery in the ejecting system.

A third aspect of the present invention is characterised in that: also comprise an one-way valve and fuel cycle pipe opening/closing mechanism in second aspect, described one-way valve is arranged on the fuel cycle pipe between the position and supplying pipe opening/closing mechanism of supplying pipe branch, and work is to prevent that liquefied gas as fuel from flowing backwards from jet pump; Described fuel cycle pipe opening/closing mechanism be arranged in the fuel cycle pipe and work to open and close the flow channel of fuel cycle pipe.

A fourth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine, it is characterized in that comprising: a supply pump is used for the liquefied gas as fuel of fuel tank is pressurized to predetermined pressure and described liquefied gas as fuel is transported to a supplying pipe; A jet pump is used for predetermined amount the liquefied gas as fuel of fuel channel being flowed to the nozzle of diesel engine in predetermined timing, and wherein the liquefied gas as fuel of carrying through supplying pipe flows in the described fuel channel; An overflow fuel pipe is used to make the liquefied gas as fuel that overflows from jet pump to turn back to fuel tank; With the residual fuel recovering mechanism, be used for after diesel engine stops, the liquefied gas as fuel that remains in fuel channel and the overflow fuel pipe is recovered in the fuel tank.Described residual fuel recovering mechanism has: a fuel cycle pipe, and it is from the midpoint branch of supplying pipe and be connected on the fuel tank; Supplying pipe opening/closing mechanism, it is along being arranged in the supplying pipe on downstream one side of the supply pump of liquefied gas as fuel flow direction, and work is to open and close the flow channel of supplying pipe; With an aspirator, it is arranged in the fuel cycle pipe and has a pump port that is communicated with fuel channel and/or overflow fuel pipe.Described residual fuel recovering mechanism is so constructed, with by close supplying pipe opening/closing mechanism, cutting off under the condition of supplying of jet pump, will be recycled to from the liquefied gas as fuel that supply pump is carried the fuel tank through supplying pipe, fuel cycle pipe and aspirator; And the liquefied gas as fuel that will remain in fuel channel and the overflow fuel pipe by the suction force that produces in the pump port of aspirator based on described circulation aspirates, is recovered in the fuel tank.Described residual fuel recovering mechanism also comprises: fuel cycle pipe opening/closing mechanism and an one-way valve, described fuel cycle pipe opening/closing mechanism be arranged in the fuel cycle pipe and work to open and close the flow channel of fuel cycle pipe; Described one-way valve is arranged between the point of branching and supplying pipe opening/closing mechanism between supplying pipe and fuel cycle pipe, and work is to prevent that liquefied gas as fuel from flowing backwards from jet pump.

The fuel cycle pipe from supplying pipe branch, and is connected to fuel tank through the aspirator entrance and exit near the delivery port of supply pump.When closing supplying pipe opening/closing mechanism, with cut off and the jet pump same side on supplying pipe being communicated with respect to the point of branching between supplying pipe and the fuel cycle pipe; Open fuel cycle pipe opening/closing mechanism; Activate supply pump and allow and form the annularly flow of the liquefied gas as fuel that comprises aspirator, and in the pump port of aspirator, produce suction force when the fuel cycle pipe is communicated with.In this state, when pump port, fuel channel and the overflow fuel pipe of aspirator communicate with each other, can remain in the liquefied gas as fuel fuel channel and the overflow fuel pipe from the pump port suction of aspirator.Along with liquefied gas as fuel flows to outlet from the inlet of aspirator, be recycled to the fuel tank from the liquefied gas as fuel of the pump port suction of aspirator.

In addition and since the fuel cycle pipe that constitutes circulation canal near the delivery port of supply pump from supply pump branch, and be connected on the fuel tank to outlet, so can construct the circulation canal of liquefied gas as fuel compactly from the inlet of aspirator.That is, owing to can shorten the length of the circulation canal of the liquefied gas as fuel that comprises aspirator, so can reduce the flow channel resistance of circulation canal.Therefore, can reduce the reduction of the flow rate of the liquefied gas as fuel that in circulation canal, flows that causes by the flow channel resistance, and reduce the reduction of the suction force that in the pump port of aspirator, produces, thereby can improve the efficient that reclaims residual fuel by aspirator.

In addition, owing to be used to the one-way valve that prevents that liquefied gas as fuel from flowing backwards from jet pump from being provided with one between the point of branching of supplying pipe branch and the supplying pipe opening/closing mechanism, so described between the two supplying pipe keeps being filled with liquefied gas as fuel at the fuel cycle pipe.As long as close the supplying pipe opening/closing mechanism of spraying pump side, the liquefied gas as fuel that fills between supplying pipe opening/closing mechanism and one-way valve just can not flow in the jet pump.Therefore, can prevent owing to the above-mentioned undesired fuel that fills the liquefied gas as fuel between supplying pipe opening/closing mechanism and one-way valve such as the appearance of pinking, thereby needn't reclaim the liquefied gas as fuel that remains between supplying pipe opening/closing mechanism and the one-way valve by the residual fuel recovering mechanism.

Then, by suitably opening and closing after fuel cycle pipe opening/closing mechanism and supplying pipe opening/closing mechanism reclaim the liquefied gas as fuel remain in fuel channel and the overflow fuel pipe by aspirator, close fuel cycle pipe opening/closing mechanism under the situation that keeps closing in supplying pipe opening/closing mechanism, and, stop supplying pipe and liquefied gas fuel supply device.Therefore, liquefied gas as fuel can be remained on the state that is filled between supplying pipe opening/closing mechanism and one-way valve.Therefore, the amount of the liquefied gas as fuel that will be reclaimed by the residual fuel recovering mechanism after can reducing diesel engine and stopping.In addition, after diesel engine stopped, liquefied gas as fuel remained on and is filled at the supplying pipe opening/closing mechanism of supplying pipe and the state between the one-way valve, thereby will be charged into the liquefied gas as fuel amount of ejecting system can reduce next time starting diesel engine the time.

According to the liquefied gas fuel supply device that is used for diesel engine of fourth aspect present invention, can improve the efficient that reclaims residual fuel by aspirator, but also the amount of the liquefied gas as fuel that will be reclaimed by the residual fuel recovering mechanism after can reducing diesel engine and stopping.Therefore, can obtain following effect and advantage, that is, reduce after diesel engine stops the liquefied gas as fuel in the ejecting system is recovered to the time required in the fuel tank.

In addition, owing to will be charged into the liquefied gas as fuel amount of ejecting system can reduce next time starting diesel engine the time,, when promptly reducing diesel engine starting liquefied gas as fuel is charged into the time required the ejecting system from fuel tank so can obtain following effect and advantage.

In addition, the pump port that wherein produces the aspirator of suction force by the circulation of liquefied gas as fuel is arranged on than wherein residual the fuel channel of liquefied gas as fuel, a regional low position of overflow fuel pipe.That is, residual after liquefied gas fuel supply device stops to have the fuel channel of liquefied gas as fuel and overflow fuel pipe to be set at the position higher than the pump port of aspirator.Therefore, the associating power that remains in the suction force that the liquefied gas as fuel in fuel channel and the overflow fuel pipe produced by the circulation of gravity and liquefied gas as fuel is recovered in the fuel tank, thereby can more effectively utilize gravity to reclaim the liquefied gas as fuel that remains in the ejecting system.Therefore, can obtain following effect and advantage, that is, after reducing diesel engine and stopping with the required time in the fuel tank of the DME fuel recovery in the ejecting system.

A fifth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to either side in first to fourth aspect, it is characterized in that also comprising: vapour phase penstock and vapour phase penstock opening/closing mechanism, described vapour phase penstock connects one and is used for the inlet of liquefied gas as fuel of jet pump and the vapour phase in the fuel tank; Described vapour phase penstock opening/closing mechanism is used to open and close the vapour phase penstock.

Stop the back by opening vapour phase penstock opening/closing mechanism at diesel engine, it is logical that the inlet of vapour phase in the fuel tank and fuel channel is connected with each other, thereby the vapour phase pressure in the fuel tank acts in the fuel channel.In the vapour phase of fuel tank, the liquefied gas as fuel of vaporization exists under than the high pressure of the pressure in the fuel channel, thus can will remain in by the pressure of vapour phase in the fuel tank liquid lng fuel in fuel channel and the overflow fuel pipe under pressure forced conveyance to the residual fuel recovering mechanism.Therefore, can obtain following effect and advantage, promptly reduce by the residual fuel recovering mechanism and reclaim the required time of liquefied gas as fuel that remains in fuel channel and the overflow fuel pipe.

A sixth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 5th aspect, it is characterized in that: described vapour phase penstock opening/closing mechanism is arranged on than the regional high position in the residual jet pump that liquefied gas as fuel arranged.

In this mode, because vapour phase penstock opening/closing mechanism is arranged on the position higher than fuel channel, thus remain in fuel channel and the overflow fuel pipe liquid lng fuel by the associating power of the pressure of vapour phase in gravity and the fuel tank under pressure forced conveyance to the residual fuel recovering mechanism.Therefore, the liquid lng fuel that gravity can more effectively be used for will remaining under pressure in fuel channel and the overflow fuel pipe is transported to the residual fuel recovering mechanism, is recovered to the time required in the fuel tank thereby can further reduce the liquefied gas as fuel that will be remained in fuel channel and the overflow fuel pipe by the residual fuel recovering mechanism.

A seventh aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to either side in first to fourth aspect, it is characterized in that comprising: a kind of structure, wherein the liquefied gas as fuel of carrying from jet pump is supplied to and has rail altogether and be transported to each fuel nozzle from described rail altogether; But also comprise a vapour phase penstock and vapour phase penstock opening/closing mechanism, described vapour phase penstock connects the vapour phase in the rail and fuel tank altogether, and described vapour phase penstock opening/closing mechanism is used to open and close the vapour phase penstock.

In a kind of common rail diesel engine, after diesel engine stopped, the liquefied gas as fuel that remains in the common rail also needed to be recycled in the fuel tank.In this mode, vapour phase in the fuel tank and common rail are set to by the vapour phase penstock and communicate with each other, and when after diesel engine stops, opening vapour phase penstock opening/closing mechanism, vapour phase in the fuel tank and common rail communicate with each other by the vapour phase penstock, thereby the vapour phase pressure in the fuel tank acts on the inboard of common rail.In the vapour phase of fuel tank, exist under the high pressure of liquefied gas as fuel pressure in of vaporization than fuel channel, thus can will remain in by the pressure of vapour phase in the fuel tank liquid lng fuel in the common rail under pressure forced conveyance to the residual fuel recovering mechanism.Therefore, can obtain following effect and advantage, that is, further reduce the liquefied gas as fuel that will remain in the common rail and be recovered to the time required in the fuel tank by the residual fuel recovering mechanism.

A eighth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 7th aspect, it is characterized in that: described vapour phase penstock opening/closing mechanism is arranged on the position higher than common rail.

In this mode, vapour phase penstock opening/closing mechanism is arranged on the position higher than common rail, remain in the common rail liquid lng fuel by the associating power of the pressure of vapour phase in gravity and the fuel tank under pressure forced conveyance to the residual fuel recovering mechanism.Therefore, because the liquid lng fuel that can utilize gravity more effectively will remain under pressure in the common rail is transported to the residual fuel recovering mechanism, so can obtain following effect and advantage, promptly further reduce the liquefied gas as fuel that will remain in the common rail and be recovered to the time required in the fuel tank by the residual fuel recovering mechanism.

A ninth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to either side in first to fourth aspect, it is characterized in that comprising: a kind of structure, wherein the liquefied gas as fuel of carrying from jet pump is supplied to and has rail altogether and be transported to each fuel nozzle from described rail altogether; But also comprise a vapour phase penstock and vapour phase penstock opening/closing mechanism, described vapour phase penstock connects the inlet of fuel nozzle and the vapour phase in the fuel tank, and described vapour phase penstock opening/closing mechanism is used to open and close the vapour phase penstock.

In this mode, vapour phase in each fuel nozzle and the fuel tank is set to by the vapour phase penstock and communicates with each other, and when after diesel engine stops, opening vapour phase penstock opening/closing mechanism, vapour phase in the fuel tank and each fuel nozzle communicate with each other by the vapour phase penstock, thereby the vapour phase pressure in the fuel tank acts on the inboard of each fuel nozzle.In the vapour phase of fuel tank, exist under the high pressure of liquefied gas as fuel pressure in of vaporization than fuel channel, thus can will remain in by the pressure of vapour phase in the fuel tank liquid lng fuel in each fuel nozzle under pressure forced conveyance to the residual fuel recovering mechanism.In a kind of common common-rail type fuel supplying device, fuel nozzle is arranged on the highest position, and rail and jet pump are arranged on time high position altogether, and fuel tank is arranged on extreme lower position.That is, remain in fuel nozzle, altogether in rail and the jet pump (fuel channel) liquefied gas as fuel in each can be under pressure by vapour phase pressure and gravity with from the order forced conveyance of extreme higher position to the residual fuel recovering mechanism.Therefore, can obtain following effect and advantage, that is, further reduce the liquefied gas as fuel that will remain in the fuel nozzle and be recovered to the time required in the fuel tank by the residual fuel recovering mechanism.

A tenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 9th aspect, it is characterized in that: described vapour phase penstock opening/closing mechanism is arranged on the position higher than fuel nozzle.

Because in this mode, vapour phase penstock opening/closing mechanism is arranged on the position higher than each fuel nozzle, thus remain in each fuel nozzle liquefied gas as fuel by the associating power of the pressure of vapour phase in gravity and the fuel tank under pressure forced conveyance to the residual fuel recovering mechanism.Therefore, because the liquid lng fuel that can utilize gravity more effectively will remain under pressure in each fuel nozzle is transported to the residual fuel recovering mechanism, so can obtain following effect and advantage, promptly further reduce the liquefied gas as fuel that will remain in each fuel nozzle and be recovered to the time required in the fuel tank by the residual fuel recovering mechanism.

Described vapour phase penstock preferably has a restriction, is reduced by the part at the internal diameter of this place's vapour phase penstock.

The vaporization liquefied gas as fuel that vapour phase from fuel tank is carried is compressed to very high pressure by restriction, thereby can be under very high pressure the residual liquid butane fuel of liquid state be transported to the residual fuel recovering mechanism.Therefore, can obtain following effect and advantage, reduce further that promptly the residual liquid butane fuel is recovered to the time required in the fuel tank.

A eleventh aspect of the present invention provide a kind of according to second to the fourth aspect the liquefied gas fuel supply device that is used for diesel engine of either side, it is characterized in that also comprising: an oil separator, be used for separating the liquefied gas as fuel that mixes with the lubricant oil of the cam chamber of jet pump, the special-purpose lubrication system of described cam chamber for separating with the lubrication system of diesel engine; A compressor is used for being transported to fuel tank to the liquefied gas as fuel pressurization that is separated by oil separator and with described liquefied gas as fuel; A low-pressure cabinet, it is connected to the pump port of compressor; An outlet pipe, it communicates with each other low-pressure cabinet and overflow fuel pipe; With outlet pipe opening/closing mechanism, it can open and close outlet pipe.

As previously mentioned, liquefied gas as fuel have at room temperature different characteristics with gas and also viscosity low, therefore, in jet pump, liquefied gas as fuel leaks into the cam chamber from the plunger of jet pump units.Owing to this reason, the cam chamber of jet pump is formed special-purpose lubrication system a kind of and that lubrication system diesel engine is separated, and leak in the cam chamber and and the liquefied gas as fuel of lubricant oil mixing separate by oil separator and under pressure, be transported to fuel tank by compressor.Therefore, can reduce the liquefied gas as fuel that leaks in the cam chamber.

Because low-pressure cabinet is connected to the pump port of compressor, so the inboard of low-pressure cabinet remains on a kind of low-pressure state by the suction force of compressor.When opening outlet pipe opening/closing mechanism and ejecting system is communicated with low-pressure cabinet, can aspirate and be recovered in the low-pressure cabinet through the overflow fuel pipe by the partial liquefaction gas fuel that the negative pressure in the low-pressure cabinet that keeps under low pressure will remain in the ejecting system by the pump port of compressor.Then, the liquefied gas as fuel that is recovered in the low-pressure cabinet is transported in the fuel tank, is vaporized owing to being aspirated by compressor simultaneously.

Can utilize compressor to aspirate and be recovered in the low-pressure cabinet through the overflow fuel pipe by the partial liquefaction gas fuel that the negative pressure that keeps in the low-pressure cabinet under low pressure will remain in the ejecting system, wherein said compressor will be transported in the fuel tank by the liquefied gas as fuel that the lubricating oil separation of oil separator from cam chamber come out.Therefore, the partial liquefaction gas fuel that can will remain in by a passage that is different from the residual fuel recovering mechanism in the ejecting system reasonably reclaims.Therefore, owing to the load that can reduce on the residual fuel recovering mechanism,, that is, further reduce the liquefied gas as fuel that will remain in the ejecting system and be recovered to the time required in the fuel tank by the residual fuel recovering mechanism so can obtain following effect and advantage.

A twelveth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the tenth one side, and it is characterized in that: one is used for keeping the one-way valve of low-pressure cabinet pressure to be set between compressor and the low-pressure cabinet.

Because the inboard of low-pressure cabinet is remained under the predetermined pressure by one-way valve, so can obtain following effect and advantage, that is, will often keep under low pressure by the inboard of being aspirated the low-pressure cabinet that reaches low-pressure state by compressor.

A thirteenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the tenth one side, it is characterized in that: the residual fuel recovering mechanism comprises: supplying pipe opening/closing mechanism and fuel cycle pipe opening/closing mechanism, be used for any inlet that delivery port with supplying pipe switches to the inlet of the inlet of circulation canal of aspirator and fuel channel, and delivery port is connected with described any inlet; Pump port opening/closing mechanism is used to open and close the pump port of aspirator and the connection between fuel channel and the overflow fuel pipe; Reclaim control device with a liquefied gas as fuel, it can carry out control, will switch to the inlet of aspirator by the connection that each supplying pipe opening/closing mechanism and fuel cycle pipe opening/closing mechanism provide, open the pump port opening/closing structure, and form a mobile passage, wherein the liquefied gas as fuel of carrying from supply pump will be by this channel cycle to fuel tank; And carry out control, opening vapour phase penstock opening/closing mechanism, and, only close vapour phase penstock opening/closing mechanism through after the scheduled time.

By the opening of pump port opening/closing mechanism and a kind of annularly flow of supplying pipe opening/closing mechanism and fuel cycle pipe opening/closing mechanism formation liquefied gas as fuel, wherein the liquefied gas as fuel in the fuel tank flow to outlet and turns back to fuel tank once more from the inlet of aspirator.Simultaneously, open vapour phase penstock opening/closing mechanism, and the pressure by vapour phase in the fuel tank will remain in liquid lng fuel in fuel channel and the overflow fuel pipe under pressure forced conveyance to the residual fuel recovering mechanism.Then, through after the scheduled time, only close vapour phase penstock opening/closing mechanism, thereby fuel channel and overflow fuel pipe are remained on its low-pressure state.

That is, the liquid lng fuel in remaining in fuel channel and overflow fuel pipe after the pressure conveying by vapour phase, is only closed vapour phase penstock opening/closing mechanism under pressure.Therefore, the inboard of the inboard of fuel channel and overflow fuel pipe is maintained at low-pressure state, thereby, can quicken not under pressure, not to be completely transported and the vaporization of residual a little liquid lng fuel.Therefore, owing to can in the quite short time, the liquefied gas as fuel in fuel channel and the overflow fuel pipe be recovered in the fuel tank, so can obtain following effect and advantage, that is, further reduce the liquefied gas as fuel that will remain in fuel channel and the overflow fuel pipe and be recovered to the time required in the fuel tank by the residual fuel recovering mechanism.

A fourteenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 13 aspect, it is characterized in that: liquefied gas as fuel reclaims control device and is configured to carry out control, to open outlet pipe opening/closing mechanism after closing pump port opening/closing mechanism.

After diesel engine stops, the connection of the connected sum fuel cycle pipe opening/closing mechanism of supplying pipe opening/closing mechanism is switched to the inlet of aspirator, and pump port opening/closing mechanism is opened, thereby form a kind of annularly flow of liquefied gas as fuel, wherein the liquefied gas as fuel in the fuel tank flow to outlet and turns back to fuel tank once more from the inlet of aspirator, and remains in the liquefied gas as fuel fuel channel and the overflow fuel pipe and it is recovered in the fuel tank from the pump port suction of aspirator.Then, the suction of the residual fuel of being undertaken by this aspirator continues the scheduled time, and when residual fuel still remains, closes pump port opening/closing mechanism, to close the pump port of aspirator.Then, open above-mentioned discharge tube opening/closing mechanism,, thereby aspirate residual fuel fast by the negative pressure of low-pressure cabinet so that low-pressure cabinet and overflow fuel pipe communicate with each other.Will remain in after liquefied gas as fuel in the ejecting system is recovered in the fuel tank to a certain extent at aspirator, not being sucked residual fuel that device reclaims fully can be by the suction and reclaiming rapidly of the negative pressure of low-pressure cabinet.Therefore, can obtain following effect and advantage, that is, further reduce diesel engine and stop back the recovery the required time of liquefied gas as fuel that remains in the ejecting system.

A fifteenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the third aspect or fourth aspect, it is characterized in that: the residual fuel recovering mechanism comprises: supplying pipe opening/closing mechanism, be used to open and close with the jet pump same side on supplying pipe being communicated with respect to the point of branching between supplying pipe and the fuel cycle pipe; Fuel cycle pipe opening/closing mechanism is used to open and close the inlet of aspirator; Pump port opening/closing mechanism is used to open and close the pump port of aspirator and the connection between fuel channel and the overflow fuel pipe; Reclaim control device with a liquefied gas as fuel, be used for carrying out control, to open and close supply pump, supplying pipe opening/closing mechanism, fuel cycle pipe opening/closing mechanism and pump port opening/closing mechanism.Liquefied gas as fuel reclaims control device and is so constructed, carry out control stopping the back at diesel engine, to close supplying pipe opening/closing mechanism and to cut off the supply of liquefied gas as fuel to fuel channel, and carry out and control, with by opening fuel cycle pipe opening/closing mechanism and pump port opening/closing mechanism, make the liquefied gas as fuel of carrying from supply pump be recycled to fuel tank, the pump port of aspirator is communicated with fuel channel and overflow fuel pipe through the fuel cycle pipe.

After diesel engine stops, control supplying pipe opening/closing mechanism, it is closed and cuts off the supply of liquefied gas as fuel to fuel channel, and control fuel cycle pipe opening/closing mechanism and pump port opening/closing mechanism, to open it and to form a circulation canal, the liquefied gas as fuel of carrying from supply pump is recycled to fuel tank along this passage through the fuel cycle pipe, and wherein the pump port of aspirator is communicated with fuel channel and overflow fuel pipe.The liquefied gas as fuel of carrying from supply pump flows into the fuel cycle pipe, and the inlet from aspirator flows to outlet then, and returns fuel tank once more.Formation comprises the annularly flow of the liquefied gas as fuel of aspirator, and produces suction force in the pump port of aspirator.Along with liquefied gas as fuel flows to outlet from the inlet of aspirator, remain in liquefied gas as fuel in fuel channel and the overflow fuel pipe by from the pump port suction of aspirator and be recycled to the fuel tank.

In this mode, the fuel cycle opening/closing mechanism that can open and close the aspirator inlet is arranged in the fuel cycle pipe; Supplying pipe opening/closing mechanism is arranged in the supplying pipe, described supplying pipe opening/closing mechanism can open and close with the jet pump same side on supplying pipe being communicated with respect to the point of branching between supplying pipe and the fuel cycle pipe; Liquefied gas as fuel reclaims control device and carries out control, to open and close fuel cycle opening/closing mechanism and supplying pipe opening/closing mechanism.Therefore, can carry out the opening and closing of the fuel cycle pipe on the aspirator inlet side independently, and and the jet pump same side on supplying pipe with respect to the opening and closing of the point of branching between supplying pipe and the fuel cycle pipe.

Therefore, the liquefied gas fuel supply device that is used for diesel engine of the 15 aspect according to the present invention, liquefied gas as fuel reclaims control device can carry out control, opening and closing fuel cycle opening/closing mechanism and supplying pipe opening/closing mechanism, thereby can obtain effect and advantage by the third aspect or fourth aspect realization.

A sixteenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 15 aspect, it is characterized in that: described liquefied gas as fuel reclaims control device and is so constructed, can carry out control, liquefied gas as fuel is remained on the state in the supplying pipe that is filled between supplying pipe opening/closing mechanism and one-way valve, continue control simultaneously, after being recovered in the fuel tank with the liquefied gas as fuel in will remaining in fuel channel and overflow fuel pipe, close supplying pipe opening/closing mechanism.

In this mode, owing to the state that liquefied gas as fuel is remained in the supplying pipe that is filled between supplying pipe opening/closing mechanism and one-way valve, after wherein the liquefied gas as fuel in remaining in fuel channel and overflow fuel pipe has been recycled in the fuel tank, close supplying pipe opening/closing mechanism, so the amount of the liquefied gas as fuel that will reclaim by the residual fuel recovering mechanism after can reducing diesel engine and stopping, and to be charged into the amount of the liquefied gas as fuel in the ejecting system can diesel engine starting the time.

A seventeenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 15 aspect, it is characterized in that: described residual fuel recovering mechanism, aspirator and fuel cycle pipe opening/closing mechanism are near the fuel tank setting.

In this mode, short as much as possible by the length that makes the fuel cycle pipe, the circulation passage resistance of fuel cycle pipe is minimized.Therefore, can make in circulation canal the liquefied gas as fuel that flows flow rate reduce minimize, and the reduction of suction force in the pump port that is created in aspirator is minimized, thereby can further improve the efficient that reclaims residual fuel by aspirator.

A eighteenth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the 15 aspect, it is characterized in that: in the residual fuel recovering mechanism, supplying pipe opening/closing mechanism is arranged near the fuel channel inlet the supplying pipe, and with one-way valve near the point of branching setting between supplying pipe and the fuel cycle pipe.

In this mode, supplying pipe opening/closing mechanism is set near the inlet of fuel channel of jet pump, and one-way valve is set at the position near the point of branching between supplying pipe and the fuel cycle pipe.Therefore, by closing supplying pipe opening/closing mechanism, liquefied gas as fuel can be maintained near the inlet of the fuel channel that charges into jet pump and near the point of branching between supplying pipe and the fuel cycle pipe between supplying pipe in state.In addition, because liquefied gas as fuel also is maintained at the state that charges between fuel tank and the one-way valve, in the starting time of diesel engine, when liquefied gas as fuel will be charged into ejecting system, with charge into about identical time of beginning, liquefied gas as fuel can begin to be charged in the fuel channel of jet pump.Therefore, can further reduce the time that when diesel engine starting, charges into liquefied gas as fuel in the ejecting system to be spent.

19 aspects of the present invention provide a kind of liquefied gas fuel supply device that is used for diesel engine of five aspects of basis, it is characterized in that: described liquefied gas as fuel reclaims control device and is so controlled, can carry out control, to open vapour phase penstock opening/closing mechanism and the vapour phase pressure in the fuel tank is transported to fuel channel and overflow fuel pipe.

By opening vapour phase penstock opening/closing mechanism, can be by the vapour phase pressure in the fuel tank, the liquefied gas as fuel that will remain in forcibly in fuel channel and the overflow fuel pipe is transported to the residual fuel recovering mechanism.Therefore, can obtain following effect and advantage, that is, reduce by the residual fuel recovering mechanism to remain in the time that liquefied gas as fuel in fuel channel and the overflow fuel pipe is recovered in the fuel tank to be spent.

A twentieth aspect of the present invention provides a kind of liquefied gas fuel supply device that is used for diesel engine according to the tenth one side, it is characterized in that: described liquefied gas as fuel reclaims control device and is so constructed, after stopping at diesel engine, can carry out control, to close supplying pipe opening/closing mechanism and to cut off the supply of liquefied gas as fuel to fuel channel; And after closing pump port opening/closing mechanism and stopping supply pump, carry out control, be drawn in the low-pressure cabinet with the liquefied gas as fuel of opening outlet pipe opening/closing mechanism and will remain in fuel channel and the overflow fuel pipe.

After diesel engine stops, thereby controlled being closed of supplying pipe opening/closing mechanism, and cut off liquefied gas as fuel supply to fuel channel, when supply pump is stopped and pump port opening/closing mechanism when being closed, fuel channel and overflow fuel pipe and supplying pipe and aspirator are separated.Then, above-mentioned outlet pipe opening/closing mechanism is opened, thereby low-pressure cabinet and overflow fuel pipe are communicated with each other, and the fuel that remains in fuel channel and the overflow fuel pipe is aspirated by the negative pressure of low-pressure cabinet.In this mode, reclaim the fuel that remains in fuel channel and the overflow fuel pipe by negative pressure by low-pressure cabinet, can obtain following effect and advantage, that is, reduce after diesel engine stops and reclaiming the time that liquefied gas as fuel spent that remains in the ejecting system by aspirator.

Description of drawings

Fig. 1 is a schematic representation, shows first embodiment according to DME fuel supplying device of the present invention;

Fig. 2 is a schematic representation, shows the halted state according to the DME fuel supplying device of the first embodiment of the present invention;

Fig. 3 is a schematic representation, shows to charge into state with the DME fuel supplying device of duration of work according to first embodiment of the invention at fuel;

Fig. 4 is a schematic representation, shows the state according to the DME fuel supplying device during DME fuel is sucked device recovery (vapour phase substitutes) of first embodiment of the invention;

Fig. 5 is a schematic representation, shows the state according to the DME fuel supplying device during reclaiming residual fuel of first embodiment of the invention, and shows DME fuel and be pumped into state in the low-pressure cabinet;

Fig. 6 is a schematic representation, shows second embodiment according to DME fuel supplying device of the present invention, and shows the DME fuel supplying device that is used for common rail diesel engine, and wherein rail is continuous together for the vapour phase penstock;

Fig. 7 is a schematic representation, shows the 3rd embodiment according to DME fuel supplying device of the present invention, and shows the DME fuel supplying device that is used for common rail diesel engine, and wherein the vapour phase penstock links to each other with injection pipe;

Fig. 8 is a schematic representation, shows the 4th embodiment according to DME fuel supplying device of the present invention;

Fig. 9 is a schematic representation, shows the 5th embodiment according to DME fuel supplying device of the present invention;

Figure 10 is a schematic representation, shows the halted state of DME fuel supplying device according to a fifth embodiment of the invention;

Figure 11 is a schematic representation, shows to charge into state with the DME fuel supplying device of duration of work according to fifth embodiment of the invention at fuel;

Figure 12 is a schematic representation, shows the state according to the DME fuel supplying device between the payoff period of residual fuel of fifth embodiment of the invention, and shows the state that DME fuel is sucked device recovery (vapour phase substitutes);

Figure 13 is a schematic representation, shows the state according to the DME fuel supplying device between the payoff period of residual fuel of fifth embodiment of the invention, and shows DME fuel and be pumped into state in the low-pressure cabinet;

Figure 14 is a schematic representation, shows DME fuel supplying device according to a sixth embodiment of the invention, and shows the DME fuel supplying device that is used for common rail diesel engine, and wherein the vapour phase penstock links to each other with rail altogether; And

Figure 15 is a schematic representation, shows DME fuel supplying device according to a seventh embodiment of the invention, and shows the DME fuel supplying device that is used for common rail diesel engine, and wherein the vapour phase penstock links to each other with injection pipe.

Embodiment

Embodiments of the invention are described below with reference to accompanying drawings.

At first, use description to the general configuration of the liquefied gas fuel supply device of diesel engine.Fig. 1 is the schematic representation of expression according to first embodiment of the liquefied gas fuel supply device that is used for diesel engine of the present invention.

The liquefied gas fuel supply device 100 of liquefied gas fuel supply diesel engine had a jet pump 1.The representative example of liquefied gas as fuel is DME and high cetane number LP gas (adding cetane additive for LP gas), and described high cetane number LP gas has the cetane number that is about 40-55, is preferably 50 or higher.In the back among the embodiment that will describe, will be with reference to being the example of liquefied gas as fuel with DME.By the way, when using high cetane number LP gas,, be used as cetane additive as nitrate, nitrite and organic peroxide with a kind of known material.A kind of special cetane additive is DTBP (Di-tertiary butylperoxide) or 2HEN (2-Ethylhexylnitrate).In addition, owing to compare with light oil, LP gas has low greasy property, so preferably, a kind of known Arrcostab is added in the LP gas as lubricated promotor.

Jet pump 1 has the jet pump units 2 with the number of cylinders equal number of diesel engine.The DME fuel that supply pump 51 will be stored in the fuel tank 4 is pressurized to predetermined pressure and described DME fuel is transported to supplying pipe 5.The DME fuel delivery port 41 of fuel tank 4 is arranged on the liquid level below of the liquid phase 4a in the fuel tank 4, supply pump 51 be arranged on fuel tank 4 DME fuel delivery port 41 near.The DME fuel that is transported in the supplying pipe 5 is filtered by filter 52, flows to jet pump 1 through three-way solenoid valve 71 then.During being in spray regime (diesel engine run duration), three-way solenoid valve 71 is opened and is allowed along direction shown in Figure 1 and is communicated with.

Cam chamber 12 in the jet pump 1 is lubrication systems of a special use that separates with the lubrication system of diesel engine, oil separator 13 from the lubricant oil of the cam chamber 12 of DME fuel mix separate DME fuel and lubricant oil, and lubricant oil turned back to cam chamber 12, DME fuel wherein is the DME fuel that leaks in the cam chamber 12 of jet pump 1.The DME fuel that is separated by oil separator 13 is transported to compressor 16 through one-way valve (safety check) 14, described one-way valve 14 prevents that the pressure of cam chamber 12 inboards from becoming unlike the atmospheric pressure height, returns fuel tank 4 by the DME fuel after compressor 16 pressurizations through one-way valve (safety check) 15 and cooler 42.It is in order to prevent that DME fuel is back to cam chamber 12 from fuel tank 4 during diesel engine is out of service that one-way valve 15 is set.Compressor 16 is a kind of with the compressor of the cam in the cam chamber 12 as its actuating force source.Therefore, can realize a kind of DME fuel supplying device 100 of more saving energy.

The DME fuel that has been pressurized to predetermined pressure by supply pump 51 and has carried from fuel tank 4 is in predetermined timing, be transported to the fuel nozzle 9 that is arranged on each cylinder of diesel engine in each jet pump units 2 from jet pump 1 under the pressure through injection pipe 3.Overflow fuel pipe 81 is provided with a relief valve 82, and this valve remains on the pressure of the DME fuel in the fuel channel 11 under the predetermined pressure, and only returns the flow direction of the direction adjusted DME fuel of fuel tank 4 at the DME fuel of allowing overflow.The DME fuel that overflows from the petrolift 1 overflow fuel pipe 81 of flowing through, and return fuel tank 4 through relief valve 82 and cooler 42.The DME fuel that overflows from each fuel nozzle 9 returns fuel tank through nozzle reflow pipe 6, overflow reflow pipe 8 and cooler 42.

DME fuel supplying device 100 also has " residual fuel recovering mechanism ", and this mechanism is used for during diesel engine is out of service the DME fuel recovery that the fuel channel 11 of jet pump 1 and overflow fuel pipe 81 is residual in fuel tank 4." residual fuel recovering mechanism " has aspirator 7, three-way solenoid valve 71, bidirectional electromagnetic valve 72 and DME fuel recovery control device 10.DME fuel recovery control device 10 detects the operation/halted state (injection of DME fuel supplying device 100/non-spray regime) of diesel engine, and carries out the opening/closing control of three-way solenoid valve 71, bidirectional electromagnetic valve 72 and supply pump 51 according to each state.During diesel engine was out of service, DME fuel recovery control device 10 was controlled, and remained in DME fuel in fuel channel 11 and the overflow fuel pipe 81 with recovery.

Aspirator 7 has inlet 7a, an outlet 7b and a suction port 7c.Inlet 7a and outlet 7b communicate with each other as the crow flies, suction port 7c from inlet 7a and outlet the communication passage between the 7b along approximately perpendicular direction branch.The outlet side of one communication passage that can be communicated with when three-way solenoid valve 71 is closed links to each other with inlet 7a, and outlet 7b links to each other with a passage that leads to fuel tank 4 through cooler 42.Suction port 7c links to each other with the bidirectional electromagnetic valve 72 that is used as suction port opening/closing mechanism, and described mechanism (diesel engine run duration) during spray regime is in closed condition.Fig. 1 represents the vertical positional relationship (with identical among the following figure) between each composed component, and aspirator 7 is arranged on the position lower than overflow fuel pipe 81.

Mechanism as fuel channel 11 inlet sides of outlet (vapour phase delivery port 43) that connects vapour phase 4b in the fuel tank 4 and jet pump 1, " residual fuel recovering mechanism " also has a vapour phase penstock 73 and a vapour phase penstock opening/closing solenoid valve 74, and this solenoid valve is used to open and close the connection of vapour phase penstock 73.Vapour phase penstock 73 has the restriction 75 that an internal diameter is reduced by the part, and vapour phase penstock opening/closing solenoid valve 74 is arranged on the position higher than the fuel channel 11 of jet pump 1.Vapour phase penstock opening/closing solenoid valve 74 is by DME fuel recovery control device 10 opening/closings control, and therefore when vapour phase penstock opening/closing solenoid valve 74 was in it and opens state of a control, the connection of vapour phase penstock 73 was opened.

DME fuel supplying device 100 also has a low-pressure cabinet 17, and this case has the little sealing configuration of Capacity Ratio fuel tank 4.Like this structure low-pressure cabinet 17 so that during by compressor 16 suctions, make its internal pressure reach low-pressure state at low-pressure cabinet 17, even and when compressor 16 stops, also can keep described low-pressure state by one-way valve 171.Low-pressure cabinet 17 communicates by the overflow fuel pipe 81 of an outlet pipe 19 with relief valve 82 upstreams, and described outlet pipe 19 is provided with an outlet pipe opening/closing solenoid valve 18 that can open and close outlet pipe 19.Outlet pipe opening/closing solenoid valve 18 is by DME fuel recovery control device 10 control, and during diesel engine was out of service, outlet pipe opening/closing solenoid valve 18 was opened and is in open mode, so low-pressure cabinet 17 and overflow fuel pipe 81 communicate with each other; At the diesel engine run duration, outlet pipe opening/closing solenoid valve 18 is closed and is in closed condition, so the connection between low-pressure cabinet 17 and the overflow fuel pipe 81 is cut off.

Below, with reference to corresponding description of drawings stop, the operation of fueling, motor and residual fuel be between payoff period, each state of the DME fuel recovery control device 10 control three-way solenoid valve 71 in the DME fuel supplying device 100, bidirectional electromagnetic valve 72, vapour phase penstock opening/closing solenoid valve 74, outlet pipe opening/closing solenoid valve 18 and supply pump 51.

Fig. 2 is the schematic representation of expression according to the halted state of DME fuel supplying device 100 of the present invention.

At stopping period, 10 pairs of three-way solenoid valve 71 of DME fuel recovery control device, bidirectional electromagnetic valve 72, vapour phase penstock opening/closing solenoid valve 74, outlet pipe opening/closing solenoid valve 18 and supply pump 51 are all carried out closing control.During closing control, petrolift 51 is stopped, three-way solenoid valve 71 forms the passage that permissible feed pipe 5 is communicated with the inlet 7a of aspirator 7 through fuel cycle pipe 53, and bidirectional electromagnetic valve 72, vapour phase penstock opening/closing solenoid valve 74 and outlet pipe opening/closing solenoid valve 18 are in its closed condition.

Fig. 3 is for expression fueling and run duration, according to the schematic representation of DME fuel supplying device 100 of the present invention.

During the fueling that from halted state DME fuel is added ejecting system such as the fuel channel 11,10 pairs of three-way solenoid valve of DME fuel recovery control device 71 are carried out and are opened control, supply pump 51 is carried out opened control then.Three-way solenoid valve 71 is opened, so the communication passage of supplying pipe 5 switches to fuel channel 11 from the inlet 7a of aspirator 7, the DME fuel in the fuel tank 4 is transported to fuel channel 11 (mark A) by supply pump 51 under pressure.When DME fuel is added in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 (the fuel channel side of relief valve 82) (mark B), but diesel engine enters its running state.When the diesel engine starting in this state and when reaching its running state, the cam in the cam chamber 12 of jet pump 1 rotates with the running of diesel engine, thus operate compressor 16.As mentioned above, the DME fuel that enters cam chamber 12 is separated by oil separator 13, then by returning fuel tank (mark C) by compressor 16 suctions.Low-pressure state is aspirated and be maintained in the inboard of low-pressure cabinet 17 also by compressor 16.

Fig. 4 is expression residual fuel between payoff period, according to the schematic representation of the state of DME fuel supplying device 100 of the present invention, and DME fuel is reclaimed (vapour phase substitutes) by aspirator 7 state is shown.

After diesel engine stops, in order to remain in DME fuel recovery in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 in fuel tank, DME fuel recovery control device 10 is closed three-way solenoid valve 71, so that 7 inlet 7a forms communication passage from supplying pipe 5 to aspirator, and open bidirectional electromagnetic valve 72, so that between the suction port 7c of the upstream of relief valve 82 overflow fuel pipe 81 and aspirator 7, communication passage is set.Therefore, the DME fuel of carrying from supply pump 51 is not transported to jet pump 1, but be transported to aspirator 7, be transported to outlet 7b from inlet 7a, overflow fuel pipe 81, overflow reflow pipe 8 and cooler 42 via relief valve 82 downstreams turn back to fuel tank 4, and are transported to aspirator 7 from supply pump 51 once more.That is, the DME fuel liquid circulates via aspirator 7 (mark D).By the suction force that flows and produced by DME fuel, the circulation of the residual DME fuel of mobile process of described DME fuel flows to outlet 7b from inlet 7a, remain in the DME fuel in the fuel channel 11 in the jet pump 1, and the DME fuel that remains in the overflow fuel pipe 81 of relief valve 82 upstreams is evaporated, promptly substituted by vapour phase, and be sucked through suction port 7c, and be inhaled into DME fuel stream from inlet 7a to outlet 7b, and be recycled to fuel tank 4 (mark E).

In suction by aspirator, with the DME fuel recovery of fuel channel 11 and overflow fuel pipe 81 time the fuel tank 4, DME fuel recovery control device 10 is also carried out vapour phase penstock opening/closing solenoid valve 74 and is opened control, and makes the vapour phase penstock 73 of the inlet of the vapour phase 4b that connects fuel tank 4 and fuel channel 11 be in connected state.Remain in liquid DME fuel in fuel channel 11 and the overflow fuel pipe 81 is transported to aspirator 7 under the high-pressure of vapour phase 4b (flag F) suction port 7c.In addition, this pressure is by the high a lot of pressure of throttle valve portion 75 boil down tos, and in described throttle valve portion, the internal diameter part of vapour phase penstock 73 reduces, thereby residual DME fuel can be transferred under this high a lot of pressure.

Therefore, owing to utilize the pressure of vapour phase 4b, liquid DME fuel is transported to the suction port 7c of aspirator 7 under pressure, therefore can reduce and reclaim the time that the DME fuel in fuel channel 11 and the overflow fuel pipe 81 is spent that remains in.Through after the scheduled time, DME fuel recovery control device 10 is only closed vapour phase penstock opening/closing solenoid valve 74, and cuts off under high pressure conditions and being communicated with of vapour phase 4b.Therefore, because the inside of fuel channel 11 and the inside of overflow fuel pipe 81 can be placed under the low-pressure state, therefore can quicken the gasification of the residual liquid DME fuel that under the effect of vapour phase pressure, is not transferred, reclaim the time that residual DME fuel is spent thereby can further reduce by " residual fuel recovering device ".

In addition, in DME fuel supplying device 100 according to the application's invention, because aspirator 7 is arranged on than on the low position of fuel channel 11 and overflow fuel pipe 81, therefore remains under the force action of the suction force that the DME fuel in fuel channel 11 and the overflow fuel pipe 81 produced in gravity and the suction port 7c by aspirator 7 and be recycled in the fuel tank 4.Therefore, can more effectively reclaim the DME fuel that remains in the ejecting system, and can further reduce after diesel engine stops the time that the DME fuel recovery in the ejecting system is spent in the fuel tank 4 by gravity.

In addition, because vapour phase penstock opening/closing solenoid valve 74 is set at than on the high position of fuel channel, remain under the force action of pressure of the vapour phase 4b of liquid DME fuel in gravity and fuel tank 4 in fuel channel 11 and the overflow fuel pipe 81, be transported to the suction port 7c of aspirator 7.Therefore, can more effectively utilize gravity, the liquid DME fuel that will remain under the effect of pressure in fuel channel 11 and the overflow fuel pipe 81 is transported to the suction port 7c of aspirator 7, thereby can further shorten the time that the DME fuel recovery that will remain in fuel channel 11 and the overflow fuel pipe 81 is spent in the fuel tank 4.

Fig. 5 is a schematic representation, shows the state of DME fuel supplying device 100 during reclaiming residual fuel according to the application's invention, and shows a state, and wherein DME fuel just is being inhaled in the low-pressure cabinet 17.

After the scheduled time DME fuel recovery control device 10 will remain in DME fuel recovery in fuel channel 11 and the overflow fuel pipe 81 by aspirator 7 after, DME fuel recovery control device 10 is carried out closing control, to stop supply pump 51, and bidirectional electromagnetic valve 72 is carried out closing control, with being communicated with between the suction port 7c that cuts off overflow fuel pipe 81 and aspirator 7.Then, 10 pairs of outlet pipes of described DME fuel recovery control device (purge pipe) opening/closing solenoid valve 18 is carried out and is opened control, is communicated with so that set up between the low-pressure cabinet 17 and the overflow fuel pipe 81 that are maintained under the approximately constant low-pressure state.Remain in DME fuel in the overflow fuel pipe 81 by the negative pressure-pumping in the low-pressure cabinet 17 (mark G) and be recovered in the low-pressure cabinet 17.When diesel engine starts and compressor 16 when activateding once more, the DME fuel that is inhaled in the low-pressure cabinet 17 is aspirated by compressor 16, and is recovered in the fuel tank 4 through overflow reflow pipe 8 (mark H).

Therefore, because DME fuel in residuing in fuel channel 11 and overflow fuel pipe 81 has been sucked after device 7 is recovered to a certain degree, outlet pipe opening/closing solenoid valve 18 is opened, can do not aspirated rapidly thereby be sucked the residual DME fuel that device 7 reclaims fully, and be recycled in the low-pressure cabinet 17.Therefore, can further shorten " residual fuel recovering mechanism " and reclaim the time that DME fuel is spent.

In this manner, can shorten the time that the DME fuel that reclaims in the ejecting system is spent after diesel engine stops.

According to another embodiment,, in described common rail diesel engine, rail altogether is set between jet pump 1 in above-mentioned first embodiment and the nozzle 9 for common rail diesel engine provides DME fuel supplying device 100.

Fig. 6 is a schematic representation, shows second embodiment according to the DME fuel supplying device 100 of the application's invention, and shows the DME fuel supplying device 100 that is used for common rail diesel engine, and wherein vapour phase penstock 73 links to each other with rail altogether.Fig. 7 is a schematic representation, shows the 3rd embodiment according to the DME fuel supplying device 100 of the application's invention, and shows the DME fuel supplying device 100 that is used for common rail diesel engine, and wherein vapour phase penstock 73 links to each other with injection pipe 3.

In above-mentioned first embodiment, nozzle 9 forms opening, is used for by the pressure that is transported to the DME fuel of injection pipe 3 from jet pump 1 pressure, sprays DME fuel.For this reason, when injection pipe 3 linked to each other with vapour phase penstock 73, it is unstable that the pressure in the injection pipe 3 may become, and have the fuel injection characteristic of the nozzle 9 unsettled risk that becomes.Therefore, described vapour phase penstock 73 can not link to each other with injection pipe 3.

On the other hand, the DME fuel supplying device 100 that is used for common rail diesel engine has a kind of structure, wherein, DME fuel is transported to common rail 91 from jet pump 1 under pressure, and the DME fuel that remains under the given high pressure conditions in being total to rail 91 is transported to each nozzle 9.For this reason, common rail diesel engine adopts a kind of electromagnetic type valve opening mechanism.This nozzle 9 is not easy to be subjected to the influence of the variation in pressure in the injection pipe 3.

Therefore, at the DME fuel supplying device 100 that is used for common rail diesel engine as shown in Figure 6, vapour phase penstock 73 is rail 91 continuous (embodiment 2) together.Therefore, after diesel engine stops, the DME fuel that remains in common rail 91, fuel channel 11 and the overflow fuel pipe 81 is recovered in the fuel tank 4 by above-mentioned " residual fuel recovering mechanism ", and the liquid DME fuel that remains in the common rail 91 is transported to aspirator 7 by the pressure of the vapour phase 4b in the fuel tank 4.Therefore, can further shorten by aspirator 7 and will remain in the time that the DME fuel recovery in the common rail 91 is spent in the fuel tank 4.In addition, be set at the high position of rail altogether 91 owing to be used to open and close the vapour phase penstock opening/closing solenoid valve 74 of vapour phase penstock 73, therefore the liquid DME fuel that remains in the common rail 91 is transported in the aspirator 7 under the effect of making a concerted effort of gravity and vapour phase pressure.For second embodiment (Fig. 6) and the 3rd embodiment (Fig. 7), the description of the part identical with structure among first embodiment is omitted.

In addition, as shown in Figure 7, be used for the DME fuel supplying device 100 of common rail diesel engine, vapour phase penstock 73 can also be connected near (inlet side of nozzle 9) (the 3rd embodiment) of the nozzle 9 of injection pipe 3.If in this manner, vapour phase penstock 73 is connected to and is arranged on than near the nozzle 9 that is total to a lot of locational injection pipe 3 of rail 91 height, and the DME fuel that remains in so in the common rail 91 can both be delivered directly to aspirator 7 with the DME fuel that remains in the injection pipe 3 under the effect of vapour phase pressure.Therefore, can further shorten by aspirator 7 and will remain in the time that the DME fuel recovery in common rail 91 and the injection pipe 3 is spent in the fuel tank 4.In addition, be set at the position high than injection pipe 3 owing to be used to open and close the vapour phase penstock opening/closing solenoid valve 74 of vapour phase penstock 73, therefore the liquid DME fuel that remains in the injection pipe 3 can more effectively be transported in the aspirator 7 under the effect of making a concerted effort of gravity and vapour phase pressure.

Fig. 8 shows a kind of situation, wherein, the three-way solenoid valve 71 among first embodiment shown in Fig. 1 is divided into as the bidirectional electromagnetic valve 711 of supplying pipe opening/closing mechanism with as the bidirectional electromagnetic valve 712 (the 4th embodiment) of fuel cycle pipe opening/closing mechanism.Especially, one one-way valve 713 is arranged on fuel cycle pipe 53 from the position of supplying pipe 5 top sets and as between the bidirectional electromagnetic valve (hereinafter referred to as " supplying pipe opening/closing solenoid valve ") 711 of supplying pipe opening/closing mechanism, is used to prevent that liquefied gas as fuel from flowing back to from jet pump 1.In addition, be arranged in the fuel cycle pipe 53 with the bidirectional electromagnetic valve (hereinafter referred to as " fuel cycle pipe opening/closing solenoid valve ") 712 that acts on the fuel cycle pipe opening/closing mechanism that opens and closes fuel cycle pipe 53.The structure of the counterpart among the structure of other parts and first embodiment is identical, therefore repeats no more here.In this manner, three-way solenoid valve 71 is divided into supplying pipe opening/closing solenoid valve 711 and fuel cycle pipe opening/closing solenoid valve 712, one-way valve 713 is set in addition, thereby each in valve 711 and 712 can both be controlled separately, so that be opened and closed, and the scope of control mode is wider.With the embodiment's that is described explanation, other effect of one-way valve 713 and advantage will become clear according to hereinafter.

Fig. 9 is a schematic representation, shows the 5th embodiment according to DME fuel supplying device of the present invention.

Be used for the DME fuel supplying device 100 of DME fuel supply diesel engine is comprised a jet pump 1.This jet pump 1 has the jet pump units 2 identical with the number of cylinders of diesel engine.Supply pump 51 will be stored in the fuel tank 4 the DME fuel pressure boost to predetermined pressure, and DME fuel is carried in the supplying pipe 5.The DME fuel delivery port 41 of fuel tank 4 is arranged under the horizontal plane of the liquid phase 4a in the fuel tank 4, and supply pump 51 be arranged on fuel tank 4 DME fuel delivery port 41 near.The DME fuel that is conveyed in the supplying pipe 5 is filtered by filter 52, and is transported to jet pump 1 through one-way valve 713 and supplying pipe opening/closing solenoid valve 711.In (during diesel engine work) during the spray regime, supplying pipe opening/closing solenoid valve 711 is opened, and is in open mode, and supplying pipe 5 is in connected state.One-way valve 713 prevents that DME fuel from flowing back to fuel tank 4 from jet pump 1.

Cam chamber 12 in the jet pump 1 is the special-purpose lubrication systems that are separated with the lubrication system that is used for diesel engine, oil separator 13 with in the cam chamber 12 with the jet pump 1 that bleeds in cam chamber 12 in the lubricant oil of DME fuel mix separate with described DME fuel, lubricant oil is turned back in the cam chamber 12.The DME fuel that is separated by oil separator 13 is transported to compressor 16 via one-way valve (safety check) 14, described one-way valve prevents that the pressure in the cam chamber 12 from becoming and is higher than atmospheric pressure that DME fuel turns back to fuel tank 4 via one-way valve (safety check) 15 and cooler 42 after compressed machine 16 superchargings.It is in order to prevent that at the diesel engine stopping period DME fuel from flowing back to the cam chamber 12 from fuel tank 4 that one-way valve 15 is set.Compressor 16 is to use cam in the cam chamber 12 as the compressor of its actuating force source.Therefore, can realize more energy-conservation DME fuel supplying device 100.

Be supplied to the DME fuel that pump 51 is pressurized to predetermined pressure and carries from fuel tank 4, under predetermined preheating quantitative pressure effect regularly, be transported to fuel nozzle 9 each cylinder that is arranged on diesel engine via injection pipe 3 by each jet pump units 2 from jet pump 1.Overflow fuel pipe 81 is provided with relief valve 82, and this relief valve remains on predetermined pressure level with the pressure of the DME fuel in the fuel channel 11, and the flow direction of DME fuel only is adjusted to along such direction, and the DME fuel that promptly overflows turns back in the fuel tank 4.The DME fuel that overflows from jet pump 1 flows through overflow fuel pipe 81, and turns back in the fuel tank 4 through relief valve 82 and cooler 42.The DME fuel that overflows from each fuel nozzle 9 turns back in the fuel tank 4 through nozzle reflow pipe 6, overflow reflow pipe 8 and cooler 42.

DME fuel supplying device 100 also has " residual fuel recovering mechanism ", be used at the diesel engine stopping period, with in the fuel channel 11 that remains in the jet pump 1 and remain in DME fuel recovery in the overflow fuel pipe 81 (hereinafter being also referred to as ejecting system) in fuel tank 4." residual fuel recovering mechanism " has aspirator 7, fuel cycle pipe 53, fuel cycle pipe opening/closing solenoid valve 712, supplying pipe opening/closing solenoid valve 711, pump port opening/closing solenoid valve 72 and DME fuel recovery control device 10.

Aspirator 7 has inlet 7a, outlet 7b and pump port 7c.Inlet 7a and outlet 7b are in direct communication with one another, and pump port 7c is the branch in an approximate vertical direction of the communication passage between the 7b from inlet 7a and outlet.When DME fuel flows to outlet during 7b from inlet 7a, in pump port 7c, produce suction force.Fig. 9 shows the vertical positional relationship (with similar in the following drawings) between the element, and aspirator 7 is arranged on than on the low position of overflow fuel pipe 81.Fuel cycle pipe 53 is near supplying pipe 5 branches the delivery port of supply pump 51, and links to each other with fuel tank 4 with outlet 7b through the inlet 7a of aspirator 7.Fuel cycle pipe opening/closing solenoid valve 712 opens and closes the inlet 7a of the aspirator 7 of fuel cycle pipe 53.Supplying pipe opening/closing solenoid valve 711 opens and closes with respect to the point of branching between supplying pipe 5 and the fuel cycle pipe 53, with being communicated with of supplying pipe 5 on jet pump 1 homonymy.Pump port opening/closing solenoid valve 72 opens and closes the pump port 7c of aspirator 7 and the outlet pipe 19 between fuel channel 11 and the overflow fuel pipe 81.

DME fuel recovery control device 10 detects the work/halted state (injection of DME fuel supplying device 100/not spray regime) of diesel engines, and, supply pump 51, supplying pipe opening/closing solenoid valve 711, fuel cycle pipe opening/closing solenoid valve 712 and pump port opening/closing solenoid valve 72 are carried out opening/closings controls (ON/OFF control) according to the state of following each parts.At the diesel engine stopping period, DME fuel recovery control device 10 is carried out control, so that will remain in the DME fuel recovery in fuel channel 11 and the overflow fuel pipe 81.

In addition, " residual fuel recovering mechanism " also has vapour phase penstock 73 and is used to open and close the vapour phase penstock opening/closing solenoid valve 74 of the connection of vapour phase penstock 73, the mechanism that couples together as the inlet side that is used for the fuel channel 11 of the outlet (vapour phase delivery port 43) of the vapour phase 4b of fuel tank 4 and jet pump 1.Vapour phase penstock 73 has restriction 75, and the inner-diameter portion whose of this restriction reduces, and vapour phase penstock opening/closing solenoid valve 74 is arranged on than on the high position of the fuel channel 11 of jet pump 1.Vapour phase penstock opening/closing solenoid valve 74 carries out opening/closing control by DME fuel recovery control device 10, thereby is in when opening state of a control when vapour phase penstock opening/closing solenoid valve 74, and the connection of vapour phase penstock 73 is opened.

DME fuel supplying device 100 also has low-pressure cabinet 17, and this low-pressure cabinet has sealing configuration, and its volume is less than the volume of fuel tank 4.Low-pressure cabinet 17 is constructed like this, and promptly when low-pressure cabinet 17 during by compressor 16 suction, its internal pressure is in low-pressure state, even and when compressor 16 stops, described low-pressure state is still by one-way valve 171 maintenances.Low-pressure cabinet 17 is communicated with the overflow fuel pipe 81 of relief valve 82 upstreams by outlet pipe 19, and outlet pipe 19 is provided with the outlet pipe opening/closing solenoid valve 18 that can open and close outlet pipe 19.Outlet pipe opening/closing solenoid valve 18 is by 10 controls of DME fuel recovery control device, and at the diesel engine stopping period, outlet pipe opening/closing solenoid valve 18 is unlocked, and make it be in open mode, thereby low-pressure cabinet 17 and overflow fuel pipe 81 communicate with each other, and during diesel engine work, outlet pipe opening/closing solenoid valve 18 is closed, and make it be in closed condition, thereby the connection between low-pressure cabinet 17 and the overflow fuel pipe 81 is cut off.

Next, with reference to respective drawings to stop, fuel charges into, engine operation and residual fuel be between payoff period, describe by each state controlled in the 10 pairs of supply pumps 51 of DME fuel recovery control device in the DME fuel supplying device 100, supplying pipe opening/closing solenoid valve 711, fuel cycle pipe opening/closing solenoid valve 712 and the pump port opening/closing solenoid valve 72.

Figure 10 is a schematic representation, shows the halted state according to the DME fuel supplying device 100 of the application's invention.

At stopping period, 10 pairs of supply pumps 51 of DME fuel recovery control device, supplying pipe opening/closing solenoid valve 711, fuel cycle pipe opening/closing solenoid valve 712, pump port opening/closing solenoid valve 72, vapour phase penstock opening/closing solenoid valve 74 and outlet pipe opening/closing solenoid valve 18 are all carried out closing control.During closing control, supply pump 51 stops, and supplying pipe opening/closing solenoid valve 711, fuel cycle pipe opening/closing solenoid valve 712, pump port opening/closing solenoid valve 72, vapour phase penstock opening/closing solenoid valve 74 and outlet pipe opening/closing solenoid valve 18 all are closed.DME fuel charges into supplying pipe 5 from the DME fuel delivery port 41 of fuel tank 4, and is transported to one-way valve 713, and the part (reference number 5a) between the one-way valve 713 and the supplying pipe opening/closing solenoid valve 711 of closing remains on the state that is full of DME fuel.

Figure 11 is a schematic representation, shows during fuel charges into and during operation according to the state of the DME fuel supplying device 100 of the application's invention.

During DME fuel being charged into ejecting system from halted state for example the fuel the fuel channel 11 charges into, 10 pairs of supplying pipe opening/closings of DME fuel recovery control device solenoid valve 711 is carried out and is opened control, supply pump 51 is carried out opened control then.Open when control when supplying pipe opening/closing solenoid valve 711 is in, 1 forms communication paths from supply pump 51 to jet pump, and by supply pump 51 (mark A), the DME fuel of fuel tank 4 is transported to fuel channel 11 under pressure.As mentioned above, supplying pipe 5 is maintained under the state that is full of DME fuel, charging into of described DME fuel is to be transported to supplying pipe opening/closing solenoid valve 711 at stopping period from the DME fuel delivery port 41 of fuel tank 4, therefore at stopping period, when the DME of fuel tank 4 fuel begins to be charged into ejecting system for example in the fuel channel 11 time, DME fuel begins rapidly to be charged in the fuel channel 11 of jet pump 1.Therefore, can shorten the time that during fuel charges into, charges into DME fuel in the ejecting system to be spent.

When DME fuel is charged in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 (mark B), but diesel engine is in working state.Diesel engine under being in this state is unlocked and when reaching working state, the cam in the cam chamber 12 of jet pump 1 and the work of diesel engine are together rotated, thereby handles compressor 16.As mentioned above, the DME fuel that has entered in the cam chamber 12 is separated by oil separator 13, returns fuel tank 4 by the suction of compressor 16 (mark C) then.The inside of low-pressure cabinet 17 is also aspirated by compressor 16, and is maintained at low-pressure state.

Figure 12 is a schematic representation, shows during reclaiming residual fuel, according to the state of the DME fuel supplying device 100 of the application's invention, and shows DME fuel and is sucked the state (vapour phase substitutes) that device 7 reclaims.

After diesel engine stops, in order to remain in DME fuel recovery in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 in fuel tank 4,10 pairs of supplying pipe opening/closings of DME fuel recovery control device solenoid valve 711 is carried out closing control, with sever supply pipe 5 with respect to the point of branching between supplying pipe 5 and the fuel cycle pipe 53 with jet pump 1 communication passage on the same side mutually, thereby to the DME fuel supply of fuel channel 11.When control is opened in 10 execution of DME fuel recovery control device, to open fuel cycle pipe opening/closing solenoid valve 712, the DME fuel of carrying from supply pump 51 is not to be transported to jet pump 1, but be transported to fuel cycle pipe 53, and be recycled to fuel tank 4 via aspirator 7 (mark D) from fuel cycle pipe 53.

Formation comprises the DME fuel annularly flow of aspirator 7, produces suction force in the pump port 7c of aspirator 7.During this state, when pump port opening/closing solenoid valve 72 controlled opening, during with pump port 7c that aspirator 7 is provided and the connection between fuel channel 11, injection pipe 3 and the overflow fuel pipe 81, the DME fuel that remains in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 can be aspirated from the pump port 7c of aspirator 7.Be vaporized (promptly being substituted) from the DME fuel of the pump port 7c of aspirator 7 suction by vapour phase, and by being created in suction force among the pump port 7c by from pump port 7c suction, and be recovered to the fuel tank 4 with the DME fuel that the inlet 7a from aspirator 7 (mark E) flow to outlet 7b.

In this manner, fuel cycle pipe 53 near the exhaust port of supply pump 51 from supplying pipe 5 branches, and link to each other with fuel tank 4 with outlet 7b via the inlet 7a of aspirator 7, thereby the length of the DME fuel cycle path that comprises aspirator 7 is shortened, and can make the flow channel resistance force diminishes of peripheral passage.Therefore, can reduce the reduction of the flow rate of the DME fuel that in circulation canal, flows that causes by the flow channel resistance, and reduce the reduction of the suction force that in the pump port 7c of aspirator 7, produces, thereby can improve the efficient that reclaims residual fuel by aspirator 7.

In addition, fuel cycle pipe opening/closing solenoid valve 712 and supplying pipe opening/closing solenoid valve 711 are configured to and can open and close independently, thereby residuing in fuel channel 11, DME fuel in injection pipe 3 and the overflow fuel pipe 81 has been sucked after device 7 recovery, if, fuel cycle pipe opening/closing solenoid valve 712 is closed, supplying pipe opening/closing solenoid valve 711 keeps cutting out and supply pump 51 stops, DME fuel supplying device 100 stops, and DME fuel can be maintained at the state that is charged between supplying pipe opening/closing solenoid valve 711 and the one-way valve 713 so.Therefore, can reduce the amount of the DME fuel that reclaims by " residual fuel recovering mechanism ", and can shorten by " residual fuel recovering mechanism " and reclaim the time that DME fuel is spent.

In addition, more preferably, aspirator 7 and fuel cycle pipe opening/closing solenoid valve 712 are provided with near fuel tank 4, so that make the length of fuel cycle pipe 53 short as much as possible.In this structure,, therefore can further improve the efficient that aspirator 7 reclaims residual fuel because the flow channel resistance of fuel cycle pipe 53 can be minimized.

In addition, more preferably, supplying pipe opening/closing solenoid valve 711 is positioned as close to the inlet setting of the fuel channel 11 of jet pump 1, and one-way valve 713 is as much as possible near the point of branching setting between supplying pipe 5 and the fuel cycle pipe 53.In this structure, can be a lot of greatly owing to when supplying pipe opening/closing solenoid valve 711 is closed, remain on the amount of the DME fuel in the supplying pipe 5, therefore can further shorten the time that when diesel engine starting, charges into DME fuel in the ejecting system to be spent.In addition, because the DME fuel quantity that remains in the ejecting system that will be recovered after diesel engine stops to become less a lot, therefore can further shorten after diesel engine stops and reclaiming the time that the DME fuel in the ejecting system is spent that remains in.

By the suction of aspirator with when the DME fuel recovery of fuel channel 11 and overflow fuel pipe 81 is in fuel tank 4, DME fuel recovery control device 10 is also carried out and is opened control, opening vapour phase penstock opening/closing solenoid valve 74, and make the vapour phase penstock 73 of the inlet of the vapour phase 4b that connects fuel tank 4 and fuel channel 11 be in connected state.Remain in liquid DME fuel in fuel channel 11 and the overflow fuel pipe 81 by the high pressure of vapour phase 4b (flag F), be transported to the pump port 7c of aspirator 7 by pressure.In addition, this pressure is reduced in the internal diameter part of this restriction place vapour phase penstock 73 by the very high pressure of restriction 75 boil down tos, thereby carries described residual DME fuel under very high pressure.

Therefore, because by utilizing the pressure of vapour phase 4b, liquid DME fuel is transported to the pump port 7c of aspirator 7 by pressure, so can shortens and reclaim the time that the DME fuel in fuel channel 11 and the overflow fuel pipe 81 is spent that remains in.Through after the scheduled time, DME fuel recovery control device 10 is only closed vapour phase penstock opening/closing solenoid valve 74, and is breaking under the high pressure conditions and being communicated with of vapour phase 4b.Therefore, because the inside of fuel channel 11 and the inside of overflow fuel pipe 81 can become low-pressure state, therefore liquid DME fuel degree vaporization keeps, under pressure, can be accelerated, reclaim the time that residual DME fuel is spent thereby can further shorten by " residual fuel recovering mechanism " by the vaporization of the pressure-feed residual liquid DME fuel of vapour phase.

In addition, in DME fuel supplying device 100, because aspirator 7 is set at than on the low position of fuel channel 11, injection pipe 3 and overflow fuel pipe 81, remain in DME fuel in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 at gravity be created under the force action of the suction force among the pump port 7c of aspirator 7 and be recycled in the fuel tank 4.Therefore, can more effectively reclaim the DME fuel that remains in the ejecting system, and can further shorten the DME fuel recovery that after diesel engine stops, will remaining in the ejecting system time in the fuel tank 4 by gravity.

In addition, because gaseous pressure delivery pipe opening/closing solenoid valve 74 is set at than on the higher position of fuel channel 11, under the force action of the pressure of the gas phase 4b in gravity and fuel tank 4, the liquid DME fuel that remains in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 is carried under the pressure of the pump port 7c of aspirator 7.Therefore, the liquid DME fuel that can utilize gravity to make to remain in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 more effectively is transported to the pump port 7c of aspirator 7 under pressure, thereby can further shorten the time that the DME fuel recovery that will remain in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 is spent in the fuel tank 4.

Figure 13 is a schematic representation, show according to the DME fuel supplying device 100 of the application's invention at the state of residual fuel between payoff period, and show the state that is pumped into low-pressure cabinet 17 at DME fuel.

After DME fuel recovery control device 10 reclaims the DME fuel scheduled time that remains in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 by aspirator 7, DME fuel recovery control device 10 is carried out closing control, to stop supply pump 51, and gaseous pressure delivery pipe opening/closing solenoid valve 74 is carried out closing control, with being communicated with between the inlet of the gas phase 4b of fuel shutoff case 4 and fuel channel 11.Then, 10 pairs of fuel cycle pipes of DME fuel recovery control device opening/closing solenoid valve 712 is carried out closing control, circulation canal with fuel shutoff Circulation pipe 53, and to pump port opening/closing solenoid valve 712 execution closing control, with the connection between the pump port 7c that cuts off overflow fuel pipe 81 and aspirator 7.Then, DME fuel recovery control device 10 is carried out and is opened control opening outlet pipe opening/closing solenoid valve 18, and the low-pressure cabinet 17 that remains under the approximately constant low-pressure state and the connection between the outlet pipe 19 are provided.The remaining DME fuel that remains in fuel channel 11, injection pipe 3 and the overflow fuel pipe 81 is pumped in the low-pressure cabinet 17 via outlet pipe 19 (mark G) by the negative pressure in the low-pressure cabinet 17.When diesel engine starts once more, make compressor 16 work, the DME fuel that is inhaled in the low-pressure cabinet 17 is aspirated by compressor 16, and is recycled in the fuel tank 4 (mark H).

Therefore, because DME fuel in residuing in fuel channel 11 and overflow fuel pipe 81 has been sucked after device 7 reclaimed to a certain degree, therefore outlet pipe opening/closing solenoid valve 18 is opened, and not being sucked the residual DME fuel that device 7 reclaims fully can be aspirated rapidly and be recovered in the low-pressure cabinet 17.Therefore, can further shorten the time that is spent by " residual fuel recovering mechanism " recovery DME fuel.

In this manner, can shorten the time that the DME fuel that reclaims in the ejecting system is spent after diesel engine stops.Can also shorten when the starting diesel engine and DME fuel be charged into the time that ejecting system spends from fuel tank 4.

According to another embodiment, a kind of DME fuel supplying device 100 that is used for common rail diesel engine is provided, wherein altogether rail is set between the jet pump 1 and nozzle 9 among above-mentioned the 4th embodiment.

Figure 14 is a schematic representation, shows the 6th embodiment according to the DME fuel supplying device 100 of the application's invention, and shows the DME fuel supplying device 100 that is used for common rail diesel engine, and wherein, vapour phase penstock 73 links to each other with rail altogether.Figure 15 is a schematic representation, shows the 7th embodiment according to the DME fuel supplying device 100 of the application's invention, and shows the DME fuel supplying device 100 that is used for common rail diesel engine, and wherein said vapour phase penstock 73 links to each other with injection pipe 3.

In above-mentioned the 5th embodiment, nozzle 9 is configured to opening, is used for the pressure injection DME fuel by the DME fuel that is transported to injection pipe 3 from jet pump 1 pressure.For this reason, when injection pipe 3 linked to each other with vapour phase penstock 73, it is unstable that the pressure in the injection pipe 3 may become, and have the fuel injection characteristic of the nozzle 9 unsettled risk that becomes.Therefore, vapour phase penstock 73 can not link to each other with injection pipe 3.

On the other hand, the DME fuel supplying device 100 that is used for common rail diesel engine has a kind of structure, wherein DME fuel is transported to common rail 91 from jet pump 1 under pressure, and the DME fuel that is maintained in the common rail 91 under the given high pressure conditions is transported to each nozzle 9.For this reason, common rail diesel engine adopts the nozzle 9 with electromagnetic type valve opening mechanism.This nozzle 9 is not easy to be subjected to the influence of the variation in pressure in the injection pipe 3.

Therefore, be used for the DME fuel supplying device 100 of common rail diesel engine, as shown in Figure 6, vapour phase penstock 73 rail 91 (embodiment 6) together links to each other.Therefore, when the DME fuel in remaining in common rail 91, fuel channel 11 and overflow fuel pipe 81 is recovered in the fuel tank 4 by above-mentioned " residual fuel recovering mechanism ", remains under the pressure effect of the vapour phase 4b of liquid DME fuel in fuel tank 4 in the common rail 91 and be transported to aspirator 7 by pressure.Therefore, can further shorten by aspirator 7 and will remain in the time that the DME fuel recovery in the common rail 91 is spent in the fuel tank 4.In addition, be set at the high position of rail altogether 91 owing to be used to open and close the vapour phase penstock opening/closing solenoid valve 74 of vapour phase penstock 73, therefore, the liquid DME fuel that remains in the common rail 91 can more effectively be transported to aspirator 7 by pressure under the force action of gravity and vapour phase pressure.For the 6th embodiment (Figure 14) and the 7th embodiment (Figure 15), saved the description of the part identical with the structure of first embodiment's part.

In addition, be used for the DME fuel supplying device 100 of common rail diesel engine, as shown in figure 15, vapour phase penstock 73 also can be connected near (inlet side of nozzle 9) (the 7th embodiment) of the nozzle 9 of injection pipe 3.If vapour phase penstock 73 is connected near the nozzle 9 that is arranged on the locational injection pipe 3 that rail 81 height are a lot of altogether in this manner, not only remain in the DME fuel in the common rail 91, and the DME fuel that remains in the injection pipe 3 can both be delivered directly to aspirator 7 under the effect of vapour phase pressure.Therefore can further shorten by aspirator 7 and will remain in the time that the DME fuel recovery in common rail 91 and the injection pipe 3 is spent in the fuel tank 4.In addition, be set at the position high owing to be used to open and close the vapour phase penstock opening/closing solenoid valve 74 of vapour phase penstock 73 than injection pipe 3, what therefore, remain in that liquid DME fuel in the injection pipe 3 can be by gravity and vapour phase pressure more effectively is transported to aspirator 7 by pressure with joint efforts.

Self-evident, the present invention is not limited to any the foregoing description, and can carry out various variations under not deviating from as the situation of the described invention scope of appended claims, and above-mentioned variation is included in the scope of invention.

According to the present invention, be used for the liquefied gas fuel supply device of diesel engine, can shorten that after diesel engine stops the liquefied gas as fuel in the ejecting system is recovered to the time that fuel tank spends.

In addition, be used for the liquefied gas fuel supply device of diesel engine, can shortening the time that when diesel engine starting, charges into liquefied gas as fuel in the ejecting system to be spent.

Industrial applicibility

The present invention is applicable to the liquefied gas feedway that is used for diesel engine, this diesel engine using liquid Change gas for example DME or high cetane number LP gas as their fuel.

Claims (20)

1. liquefied gas fuel supply device that is used for diesel engine comprises:

Fuel tank is used for the storage liquid butane fuel;

Jet pump is used for liquefied gas as fuel is transported to the fuel nozzle of diesel engine;

Fuel supply mechanism is used for liquefied gas as fuel is transported to jet pump from fuel tank; With

It is characterized in that also comprising:

The residual fuel recovering mechanism is used for after diesel engine stops, the liquefied gas as fuel that remains in the jet pump is recovered in the fuel tank,

Described residual fuel recovering mechanism is so constructed, to cause the forced refluence circulation of liquefied gas as fuel in the fuel tank, so that make liquefied gas as fuel turn back in the fuel tank once more by aspirator, and the liquefied gas as fuel that will remain in the jet pump by the suction force that is produced in the pump port of aspirator by pump circulation is recovered in the fuel tank

The pump port of described aspirator is arranged on than the regional low position in the residual jet pump that liquefied gas as fuel arranged wherein.

2. liquefied gas fuel supply device that is used for diesel engine is characterized in that comprising:

Supply pump is used for the liquefied gas as fuel of fuel tank is pressurized to predetermined pressure and described liquefied gas as fuel is transported to supplying pipe;

Jet pump is used for predetermined amount the liquefied gas as fuel of fuel channel being flowed to the nozzle of diesel engine in predetermined timing, and wherein the liquefied gas as fuel of carrying through supplying pipe flows in the described fuel channel;

The overflow fuel pipe is used to make the liquefied gas as fuel that overflows from jet pump to turn back to fuel tank; With

The residual fuel recovering mechanism is used for after diesel engine stops, the liquefied gas as fuel that remains in fuel channel and the overflow fuel pipe is recovered in the fuel tank,

Described residual fuel recovering mechanism has:

The fuel cycle pipe, it is from the midpoint branch of supplying pipe and be connected on the fuel tank;

Supplying pipe opening/closing mechanism, it is arranged in the supplying pipe in downstream one side along the supply pump of liquefied gas as fuel flow direction, and work is to open and close the flow channel of supplying pipe; With

Aspirator, it is arranged in the fuel cycle pipe and has the pump port that is communicated with fuel channel and/or overflow fuel pipe;

Described residual fuel recovering mechanism is so constructed, with by close supplying pipe opening/closing mechanism, cutting off under the condition of supplying of jet pump, will be recycled to from the liquefied gas as fuel that supply pump is carried the fuel tank through supplying pipe, fuel cycle pipe and aspirator; And the liquefied gas as fuel that will remain in fuel channel and the overflow fuel pipe by the suction force that produces in the pump port of aspirator based on described circulation aspirates and is recovered in the fuel tank;

The pump port of described aspirator is arranged on than fuel channel and the low position of overflow fuel pipe.

3. the liquefied gas fuel supply device that is used for diesel engine according to claim 2, it is characterized in that: also comprise one-way valve and fuel cycle pipe opening/closing mechanism, described one-way valve is arranged between the position and supplying pipe opening/closing mechanism that the fuel cycle pipe comes out from supplying pipe branch, and work is to prevent that liquefied gas as fuel from flowing backwards from jet pump; Described fuel cycle pipe opening/closing mechanism is arranged in the fuel cycle pipe, and work is to open and close the flow channel of fuel cycle pipe.

4. liquefied gas fuel supply device that is used for diesel engine is characterized in that comprising:

Supply pump is used for the liquefied gas as fuel of fuel tank is pressurized to predetermined pressure and described liquefied gas as fuel is transported to supplying pipe;

Jet pump is used for predetermined amount the liquefied gas as fuel of fuel channel being flowed to the nozzle of diesel engine in predetermined timing, and wherein the liquefied gas as fuel of carrying through supplying pipe flows in the described fuel channel;

The overflow fuel pipe is used to make the liquefied gas as fuel that overflows from jet pump to turn back to fuel tank; With

The residual fuel recovering mechanism is used for after diesel engine stops, and the liquefied gas as fuel that remains in fuel channel and the overflow fuel pipe is recovered in the fuel tank;

Described residual fuel recovering mechanism has:

The fuel cycle pipe, its midpoint branch from supplying pipe comes out and is connected on the fuel tank;

Supplying pipe opening/closing mechanism, it is arranged in the supplying pipe in downstream one side along the supply pump of liquefied gas as fuel flow direction, and work is to open and close the flow channel of supplying pipe; With

Aspirator, it is arranged in the fuel cycle pipe and has the pump port that is communicated with fuel channel and/or overflow fuel pipe;

Described residual fuel recovering mechanism is so constructed, with by close supplying pipe opening/closing mechanism, cutting off under the condition of supplying of jet pump, will be recycled to from the liquefied gas as fuel that supply pump is carried the fuel tank through supplying pipe, fuel cycle pipe and aspirator; And will remain in the liquefied gas as fuel suction in fuel channel and the overflow fuel pipe and be recovered in the fuel tank by the suction force that in the pump port of aspirator, produces based on described circulation,

Described residual fuel recovering mechanism also comprises:

Fuel cycle pipe opening/closing mechanism, it is arranged in the fuel cycle pipe and works to open and close the flow channel of fuel cycle pipe; With

One-way valve, it is arranged between the point of branching and supplying pipe opening/closing mechanism between supplying pipe and the fuel cycle pipe, and work is to prevent that liquefied gas as fuel from flowing backwards from jet pump.

5. according to each described liquefied gas fuel supply device that is used for diesel engine in the claim 1 to 4, it is characterized in that: also comprise vapour phase penstock and vapour phase penstock opening/closing mechanism, described vapour phase penstock connects one and is used for the inlet of liquefied gas as fuel of jet pump and the vapour phase in the fuel tank; Described vapour phase penstock opening/closing mechanism is used to open and close the vapour phase penstock.

6. the liquefied gas fuel supply device that is used for diesel engine according to claim 5 is characterized in that: described vapour phase penstock opening/closing mechanism is arranged on than the regional high position in the residual jet pump that liquefied gas as fuel arranged wherein.

7. according to each described liquefied gas fuel supply device that is used for diesel engine in the claim 1 to 4, it is characterized in that: comprise a kind of structure, wherein the liquefied gas as fuel of carrying from jet pump is supplied to and has rail altogether and be transported to each fuel nozzle from described rail altogether; But also comprise vapour phase penstock and vapour phase penstock opening/closing mechanism, and described vapour phase penstock connects the vapour phase in the rail and fuel tank altogether, and described vapour phase penstock opening/closing mechanism is used to open and close the vapour phase penstock.

8. the liquefied gas fuel supply device that is used for diesel engine according to claim 7 is characterized in that: described vapour phase penstock opening/closing mechanism is arranged on than the described high position of rail altogether.

9. according to each described liquefied gas fuel supply device that is used for diesel engine in the claim 1 to 4, it is characterized in that: comprise a kind of structure, wherein the liquefied gas as fuel of carrying from jet pump is supplied to and has rail altogether and be transported to each fuel nozzle from described rail altogether; But also comprise vapour phase penstock and vapour phase penstock opening/closing mechanism, described vapour phase penstock connects the inlet of fuel nozzle and the vapour phase in the fuel tank, and described vapour phase penstock opening/closing mechanism is used to open and close the vapour phase penstock.

10. the liquefied gas fuel supply device that is used for diesel engine according to claim 9 is characterized in that: described vapour phase penstock opening/closing mechanism is arranged on the position higher than fuel nozzle.

11. according to claim 2 or the 4 described liquefied gas fuel supply devices that are used for diesel engine, it is characterized in that also comprising: oil separator, be used for separating the liquefied gas as fuel that mixes with the lubricant oil of the cam chamber of jet pump, the special-purpose lubrication system of described cam chamber for separating with the lubrication system of diesel engine; Compressor is used for being transported to fuel tank to the liquefied gas as fuel pressurization that is separated by oil separator and with described liquefied gas as fuel; Low-pressure cabinet, it is connected to the pump port of compressor; Outlet pipe, it communicates with each other low-pressure cabinet and overflow fuel pipe; And outlet pipe opening/closing mechanism, it can open and close outlet pipe.

12. the liquefied gas fuel supply device that is used for diesel engine according to claim 11 is characterized in that: between compressor and low-pressure cabinet, be provided with the one-way valve that is used for keeping low-pressure cabinet pressure.

13. the liquefied gas fuel supply device that is used for diesel engine according to claim 11 is characterized in that, described residual fuel recovering mechanism comprises:

Supplying pipe opening/closing mechanism and fuel cycle pipe opening/closing mechanism are used for any inlet that delivery port with supplying pipe switches to the inlet of the inlet of circulation canal of aspirator and fuel channel, and delivery port are connected with described any inlet;

Pump port opening/closing mechanism, being communicated with between the pump port that is used to open and close aspirator and fuel channel and the overflow fuel pipe; And

Liquefied gas as fuel reclaims control device, it can carry out control, will switch to the inlet of aspirator by the connection that each supplying pipe opening/closing mechanism and fuel cycle pipe opening/closing mechanism provide, open the pump port opening/closing structure, and form a mobile passage, wherein the liquefied gas as fuel of carrying from supply pump will be by this channel cycle to fuel tank; And carry out control, opening vapour phase penstock opening/closing mechanism, and, only close vapour phase penstock opening/closing mechanism through after the scheduled time.

14. the liquefied gas fuel supply device that is used for diesel engine according to claim 13, it is characterized in that: described liquefied gas as fuel reclaims control device and is configured to carry out control, to open outlet pipe opening/closing mechanism after closing pump port opening/closing mechanism.

15., it is characterized in that described residual fuel recovering mechanism comprises according to claim 3 or the 4 described liquefied gas fuel supply devices that are used for diesel engine:

Supplying pipe opening/closing mechanism is used to open and close and the supplying pipe of jet pump same side being communicated with respect to the point of branching between supplying pipe and the fuel cycle pipe;

Fuel cycle pipe opening/closing mechanism is used to open and close the inlet of aspirator;

Pump port opening/closing mechanism, being communicated with between the pump port that is used to open and close aspirator and fuel channel and the overflow fuel pipe; And

Liquefied gas as fuel reclaims control device, is used for carrying out control, to open and close supply pump, supplying pipe opening/closing mechanism, fuel cycle pipe opening/closing mechanism and pump port opening/closing mechanism;

Described liquefied gas as fuel reclaims control device and is so constructed, and carries out control stopping the back at diesel engine, to close supplying pipe opening/closing mechanism and to cut off the supply of liquefied gas as fuel to fuel channel; And carry out and control, with by opening fuel cycle pipe opening/closing mechanism and pump port opening/closing mechanism, make the liquefied gas as fuel of carrying from supply pump be recycled to fuel tank, the pump port of aspirator is communicated with fuel channel and overflow fuel pipe through the fuel cycle pipe.

16. the liquefied gas fuel supply device that is used for diesel engine according to claim 15, it is characterized in that: described liquefied gas as fuel reclaims control device and is so constructed, can carry out control, liquefied gas as fuel is remained under the state in the supplying pipe that is filled between supplying pipe opening/closing mechanism and one-way valve, continue control simultaneously, after being recovered in the fuel tank with the liquefied gas as fuel in will remaining in fuel channel and overflow fuel pipe, close supplying pipe opening/closing mechanism.

17. the liquefied gas fuel supply device that is used for diesel engine according to claim 15 is characterized in that: in described residual fuel recovering mechanism, aspirator and fuel cycle pipe opening/closing mechanism are near the fuel tank setting.

18. the liquefied gas fuel supply device that is used for diesel engine according to claim 15, it is characterized in that: in the residual fuel recovering mechanism, supplying pipe opening/closing mechanism is arranged near the supplying pipe of fuel channel inlet, and one-way valve is near the point of branching setting between supplying pipe and the fuel cycle pipe.

19. the liquefied gas fuel supply device that is used for diesel engine according to claim 5, it is characterized in that: described liquefied gas as fuel reclaims control device and is so controlled, can carry out control, to open vapour phase penstock opening/closing mechanism and the vapour phase pressure in the fuel tank is transported to fuel channel and overflow fuel pipe.

20. the liquefied gas fuel supply device that is used for diesel engine according to claim 11, it is characterized in that: described liquefied gas as fuel reclaims control device and is so constructed, can carry out control after stopping at diesel engine, to close supplying pipe opening/closing mechanism and to cut off the supply of liquefied gas as fuel to fuel channel; And after closing pump port opening/closing mechanism and stopping supply pump, carry out control, be drawn in the low-pressure cabinet with the liquefied gas as fuel of opening outlet pipe opening/closing mechanism and will remain in fuel channel and the overflow fuel pipe.

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