CN110700969A - Fuel delivery device for cryogenic fuels and method for operating same - Google Patents

Fuel delivery device for cryogenic fuels and method for operating same Download PDF

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Publication number
CN110700969A
CN110700969A CN201910619357.0A CN201910619357A CN110700969A CN 110700969 A CN110700969 A CN 110700969A CN 201910619357 A CN201910619357 A CN 201910619357A CN 110700969 A CN110700969 A CN 110700969A
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CN
China
Prior art keywords
fuel
pressure
pump
delivery device
chamber
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Granted
Application number
CN201910619357.0A
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Chinese (zh)
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CN110700969B (en
Inventor
D·施尼特格
A·贝特尔
J·费尔斯特
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Robert Bosch GmbH
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Robert Bosch GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F04B9/107—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber rectilinear movement of the pumping member in the working direction being obtained by a single-acting liquid motor, e.g. actuated in the other direction by gravity or a spring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Abstract

The invention relates to a fuel delivery device for cryogenic fuels, having a fuel tank, a high-pressure delivery pump and a supply line, the high-pressure delivery pump being connectable to the fuel tank via the supply line, wherein the high-pressure delivery pump has a pump housing which has a stepped longitudinal bore in which a pump piston is arranged so as to be longitudinally movable and which comprises a high-pressure chamber which is delimited by an end of the pump piston, a low-pressure region which is formed between the longitudinal bore and the pump piston, and an intake chamber which is connected to the supply line. Furthermore, the low-pressure region is connected to a return line formed in the pump housing. Furthermore, the return line has a first line section, which can be connected to the intake chamber by means of a non-return valve arranged in the first line section, and a second line section, in which a switching valve is arranged, which can be connected to the fuel tank by means of the switching valve.

Description

Fuel delivery device for cryogenic fuels and method for operating same
Technical Field
The invention relates to a fuel delivery device for a cryogenic fuel and to a method for operating such a fuel delivery device. The fuel delivery device is used, for example, in internal combustion engines of motor vehicles operated with cryogenic fuels, in particular with natural gas.
Background
DE 102016210734 describes a fuel supply device for cryogenic fuels. The fuel delivery device has a fuel tank reservoir and a high-pressure delivery pump with a first drive, which is designed to deliver liquid fuel stored in the fuel tank reservoir against system pressure. The high-pressure delivery pump and its first drive are arranged outside the tank container. Furthermore, a low-pressure delivery pump having a second drive is provided, which is designed to compress the fuel above the pressure prevailing in the fuel tank, wherein the pressure side of the low-pressure delivery pump is connected to the suction side of the high-pressure delivery pump.
The sealing device is provided by different pressure conditions in the high-pressure delivery pump, and separates different pressure areas in the high-pressure delivery pump from one another. In this case, leaks occur between the different pressure regions, which are usually returned to the fuel tank via a return line. However, this leads to heating of the fuel tank and thus to a pressure rise, so that when a limit pressure is exceeded, a pressure limiting valve arranged in the fuel tank opens and thus harmful substances are discharged into the environment.
Disclosure of Invention
Compared with the prior art, the fuel delivery device according to the invention has the following advantages: although the high-pressure leakage is returned to the fuel circuit of the high-pressure delivery pump, less harmful substances are discharged into the environment and the efficiency of the high-pressure delivery pump is increased.
To this end, according to the invention, a fuel delivery device for cryogenic fuels is proposed, which has a fuel tank, a high-pressure delivery pump and a supply line, via which the high-pressure delivery pump can be connected to the fuel tank. The high-pressure delivery pump has a pump housing with a stepped longitudinal bore in which a pump piston is arranged so as to be longitudinally movable. The longitudinal bore comprises a high-pressure chamber which is delimited by the end of the pump piston, a low-pressure region which is formed between the longitudinal bore and the pump piston, and a suction chamber which is connected to the supply line. Furthermore, the low-pressure region is connected to a return line formed in the pump housing. The return line also has a first line section, which can be connected to the suction chamber by means of a non-return valve arranged in the first line section, and a second line section, in which a switching valve is arranged, by means of which the second line section can be connected to the fuel tank.
The invention further relates to a method for operating a fuel delivery device according to the invention, characterized by the following steps:
a. determining a predetermined threshold value for the gaseous component of the cryogenic fuel in the high-pressure delivery pump;
b. determining a gaseous component of the cryogenic fuel in the high-pressure delivery pump during operation of the high-pressure delivery pump;
c. comparing the determined gaseous component of the cryogenic fuel with a predetermined threshold;
d. the switching valve is actuated as a function of the gaseous fraction of the cryogenic fuel in the high-pressure delivery pump in such a way that
-when the gaseous component of the cryogenic fuel is greater than a predetermined threshold: opening a connection between the second line section and the fuel tank;
-when the gaseous component of the cryogenic fuel is less than a predetermined threshold: closing the connection between the second line section and the fuel tank;
e. repeating steps b to d periodically.
In an advantageous embodiment, it is provided that the predetermined threshold value is determined by an operating function of the high-pressure delivery pump.
In the usual case, therefore, when the gaseous component of the cryogenic fuel in the high-pressure delivery pump does not exceed a predetermined threshold value, the high-pressure leak is again supplied directly to the high-pressure delivery pump via the return line, for which purpose the fuel tank is not used, which would otherwise lead to heating of the fuel tank and thus to a pressure rise in the fuel tank. Furthermore, this arrangement allows a more robust design of the high-pressure delivery pump and increases the holding time of a vehicle driven with cryogenic fuel after a stop. In addition, the control strategy of the entire fuel delivery system is simplified thereby.
In a first advantageous embodiment of the invention, it is provided that the switching valve is designed as a two-position two-way valve. By using a structurally simple switching valve, in addition to an optimized operating mode, a minimization of the production costs and a high tightness between the return line and the fuel tank can be achieved.
In an advantageous development, the first line section is designed as a branch line. Thus, the return line can be connected to the fuel tank and the suction chamber in a simple manner.
In a further embodiment of the invention, it is advantageously provided that the check valve releases the connection between the first line section and the suction chamber when the pressure in the return line is higher than the pressure in the suction chamber. The high-pressure leakage can thus be returned to the high-pressure feed pump in a simple manner.
In an advantageous embodiment, the low-pressure region is sealed off from the high-pressure chamber by means of a first seal, wherein a pressure of, for example, 600bar prevails in the high-pressure chamber. The high-pressure chamber can therefore be sealed off from the low-pressure region in a structurally simple manner, for example by means of a piston ring element or a gap seal as a first seal.
In a further embodiment of the invention, it is advantageously provided that the low-pressure region is sealed off from an ambient pressure region formed in the longitudinal bore by means of a second seal. The high-pressure chamber can therefore be sealed off from the low-pressure region in a structurally simple manner, for example by means of a second seal embodied as a sealing ring.
In an advantageous embodiment, the pump piston is spring-loaded with a force opposing the direction of the suction chamber. In this way, the pump piston can be fixed in the pump housing and can be moved in the longitudinal direction in the longitudinal bore by the pressure difference.
In a further embodiment of the invention, it is advantageously provided that the suction chamber can be connected to the high-pressure chamber via at least one channel. Advantageously, the at least one channel can be opened or closed by means of a suction valve element.
In an advantageous embodiment of the invention, the suction valve element is surrounded in the suction chamber by a sleeve element, on which a spring is supported and which exerts a force on the suction valve element in the direction of the suction chamber. Thus, the suction valve element is pressed against the at least one channel, so that the connection between the suction chamber and the high pressure chamber is closed.
In an advantageous embodiment, a further delivery pump is arranged in the fuel tank, which further delivery pump delivers fuel from the fuel tank via the supply line into the intake chamber of the high-pressure delivery pump. This makes it possible to achieve a variable arrangement of the high-pressure delivery pump, so that the high-pressure delivery pump can be arranged relatively close to the fuel tank container or relatively close to the internal combustion engine, for example.
Drawings
In the drawings, embodiments of a fuel delivery device according to the invention are shown. The figures show:
fig. 1 shows an embodiment of a fuel delivery device according to the invention in longitudinal section;
fig. 2 is a flow chart of a method according to the invention for operating a fuel delivery device according to the invention.
Detailed Description
Fig. 1 shows a longitudinal section through a first exemplary embodiment of a fuel supply system 100 according to the present invention for a cryogenic fuel, for example natural gas. The fuel delivery system 100 has a fuel tank 30, a high-pressure delivery pump 1 and a supply line 18 which connects the fuel tank 30 to the high-pressure delivery pump 1.
The fuel tank 30 is used to store fuel cooled to, for example, -110 c or lower. For this purpose, the fuel tank has an inner tank 301 and an outer tank 302, which are separated by an intermediate space 303. The intermediate space 303 is usually evacuated, so that no heat input from the surroundings into the fuel tank 30 can take place. The inner tank 301 is filled with the liquid component 32 of the fuel up to the filling level 51. Above the filling level 51 the fuel is present in its gaseous phase.
The feed pump 34 penetrates the fuel tank 30, in particular in the liquid portion of the fuel, and feeds the fuel from the fuel tank 30 via the feed line 18 in the direction of the high-pressure feed pump 1. In this case, a shut-off valve 44 is arranged in the feed line 18, which shut-off valve is closed when the fuel supply device 100 is not in operation. Furthermore, the fuel tank 30 comprises a pressure limiting valve 45, so that gas can be discharged into the surroundings when a maximum limit pressure in the fuel tank 30 is exceeded.
The high-pressure delivery pump 1 has a pump housing 2, in which a stepped longitudinal bore 17 is formed. A longitudinally movable pump piston 4 is arranged in the longitudinal bore 17, said pump piston having a guide section 19 in the longitudinal bore 17, a leakage gap 190 being formed between said guide section and the longitudinal bore 17. The pump piston 4 delimits a high-pressure chamber 12 by means of an end 46, which can be connected to a high-pressure reservoir via a line 16 by means of a check valve 52.
Furthermore, a suction chamber 48 is formed in the longitudinal bore 17, which is connected to the supply line 18 and from which two channels 53 open into the high-pressure chamber 12. A longitudinally movable suction valve element 140 is arranged in the suction chamber 48, which suction valve element has a guide section 55 in the longitudinal bore 17 and projects with a disk-shaped end 54 into the high-pressure chamber 12. In the intake chamber 48, the suction valve element 140 is enclosed by the sleeve element 36 and is fixedly connected thereto, wherein the spring 38 is supported on the sleeve element 36. Furthermore, the spring 38 is supported on the pump housing 2 and presses the suction valve element 140 against a valve seat 56 formed in the pump housing 2, so that the suction valve element 140 closes off the passage 53 with its disk-shaped end 54. Thus, the suction valve member 140 constitutes the suction valve 14 together with the valve seat 56.
A low-pressure region 26 is formed between the longitudinal bore 17 and the pump piston 4, which low-pressure region is connected to the return line 22 formed in the pump housing 2. The return line 22 has a first line section 222 and a second line section 221. The first line section 222 has a check valve 20 and opens into the intake chamber 48. A switching valve 70, which is designed here as a two-position two-way valve, is arranged in the second line section 221. Furthermore, the second line section 221 is connected to the fuel tank 30.
The pump piston 4 is surrounded by a first seal 10, which is designed here as a piston ring, by means of which the high-pressure chamber 12 is sealed off from the low-pressure region 26, so that fuel can only pass from the high-pressure chamber 12 into the low-pressure region 26 through a leakage gap 190. On the side facing away from the high-pressure chamber 12, the low-pressure region 26 adjoins a surrounding pressure region 25 having a pressure of, for example, 1bar, wherein the low-pressure region 26 is sealed off from the surrounding pressure region 25 by means of the second seal 8, which is in the form of a sealing ring in this case. The ambient pressure region 25 can be connected to the surroundings via the channel 6.
The pump piston 4 is arranged with its end facing away from the intake chamber 48 in the control chamber 47, wherein the pressure in the control chamber 47 can be reduced via the channel 5. Control chamber 47 is sealed from ambient pressure region 25 by seal 57. Furthermore, a spring 24 is arranged in the control 47, which spring acts on the pump piston with a force in the direction of the opening 58. The opening 58 is connected to a hydraulic system, not shown, for driving the high-pressure feed pump 1.
The fuel delivery device 100 operates as follows: during operation of the fuel delivery system 100, the prefeed pump 34 delivers fuel from the fuel tank 30 via the supply line 18 in the direction of the intake chamber 48 of the high-pressure delivery pump 1. The pressure of the transported liquid fuel is for example not higher than 25 to 30 bar. By means of the longitudinal movement of the suction valve 14 and the pump piston 4, fuel is delivered by the high-pressure delivery pump 1. This is done as follows: if the pump piston 4 is at the opening 58 and the pressure in the high-pressure chamber 12 decreases, the suction valve element 140 releases the channel 53 due to the pressure difference in the high-pressure chamber 12 and the suction chamber 48. The low temperature fuel now flows from the intake chamber 48 into the high pressure chamber 12. After pressure equalization, suction valve element 140 closes off passage 53 again. The pump piston 4 is moved in the direction of the high-pressure chamber 12, whereby the cryogenic fuel is compressed to the system pressure mentioned, which is, for example, 600 bar. The compressed fuel can then be supplied to an injection valve of an internal combustion engine, for example.
The fuel flows from high-pressure chamber 12 via leakage gap 190 in the direction of low-pressure region 26 and can be returned via return line 22 into intake chamber 48 and thus into the fuel circuit of high-pressure feed pump 1. Here, fuel flows from the low-pressure region 26 into the return line 22. If the fuel pressure in the return line 22 is higher than the fuel in the intake chamber 48, the check valve 20 in the first line section 222 opens and cryogenic fuel flows from the return line 22 into the intake chamber 48. The fuel accumulated as a result of the leakage is therefore returned to the fuel delivery circuit of the high-pressure delivery pump 1, without being first returned to the fuel tank.
If the gas quality of the high-pressure delivery pump 1 is compatibleIf the gaseous component of the low-temperature fuel is very high in the high-pressure delivery pump 1 and no further gaseous component is available in the fuel delivery cycle due to normal operating modes, the switching valve 70 in the second line section 221 is actuated so that fuel can flow from the return line 22 via the second line section 221 into the fuel tank 30 (method 800 for operating the fuel delivery device 100).
Fig. 2 shows a flow chart of a method according to the invention for operating the fuel delivery system 100, wherein the flow chart is explained below:
depending on the design and operational mode of the high-pressure delivery pump 1, a threshold value for the gaseous component of the cryogenic fuel is determined (determination 80), and the normal operation of the high-pressure delivery pump 1 is ensured until this threshold value is reached.
During operation, the liquid fraction of the cryogenic fuel in the high-pressure feed pump 1 is now determined (determination 81) and compared to a predetermined threshold value (comparison 82).
If the gaseous component of the cold fuel in the high-pressure delivery pump is greater than a predetermined threshold value, the switching valve 70 is actuated (actuation 83) and the connection between the second line section 221 and the fuel tank 30 is opened (opening 84).
If the gaseous component of the cryogenic fuel in the high-pressure delivery pump is less than a predetermined threshold value, the switching valve 70 is also actuated (actuation 83) and the connection between the second line section 221 and the fuel tank 30 is closed (closing 85).
These steps are cyclically repeated (cycle repeat 86) for an efficient mode of operation of the high-pressure feed pump 1.
Depending on the operating state of the high-pressure delivery pump 1, the leakage can also be conducted back into the fuel tank 30 by means of the switching valve 70, in order to ensure an efficient operating mode and thus high efficiency of the high-pressure delivery pump 1.
As a result, the leakage can generally be fed back directly into the fuel delivery circuit of the high-pressure delivery pump 1 in a structurally simple manner without being guided via the fuel tank 30, which would otherwise be unnecessarily heated and thus form a pressure rise in the fuel tank 30.

Claims (13)

1. A fuel delivery device (100) for cryogenic fuel, having a fuel tank (30), a high-pressure delivery pump (1) and an inlet line (18), by means of which the high-pressure delivery pump (1) can be connected to the fuel tank (30), wherein the high-pressure delivery pump (1) has a pump housing (2) having a stepped longitudinal bore (17) in which a pump piston (4) is arranged in a longitudinally movable manner and the longitudinal bore (17) comprises a high-pressure chamber (12) which is delimited by an end (46) of the pump piston (4), a low-pressure region (26) which is formed between the longitudinal bore (17) and the pump piston (4), and a suction chamber (48) which is connected to the inlet line (18), wherein the low-pressure region (26) is connected to a return line (22) which is formed in the pump housing (2), characterized in that the return line (22) has a first line section (222) and a second line section (221), wherein the first line section (222) can be connected to the intake chamber (48) by means of a check valve (20) arranged in the first line section (222), and in that a switching valve (70) is arranged in the second line section (221), wherein the second line section (221) can be connected to the fuel tank (30) by means of the switching valve (70).
2. The fuel delivery device (100) according to claim 1, characterized in that the switching valve (70) is configured as a two-position two-way valve.
3. The fuel delivery device (100) according to claim 1 or 2, characterized in that the first pipe section (222) is configured as a branch pipe.
4. The fuel delivery device (100) according to claim 1, 2 or 3, characterized in that the check valve (20) releases the connection between the first line section (222) and the suction chamber (48) when the pressure in the return line (22) is higher than the pressure in the suction chamber (48).
5. The fuel delivery device (100) according to any one of the preceding claims, wherein the low pressure region (26) is sealed from the high pressure chamber (12) by means of a first seal (10).
6. The fuel delivery device (100) according to one of the preceding claims, characterized in that the low-pressure region (26) is sealed off from an ambient-pressure region (25) formed in the longitudinal bore (17) by means of a second seal (8).
7. The fuel delivery device (100) according to one of the preceding claims, characterized in that the pump piston (4) is loaded by means of a spring (24) with a force opposing the direction towards the suction chamber (48).
8. The fuel delivery device (100) according to any one of the preceding claims, wherein the suction chamber (48) is connectable with the high pressure chamber (12) via at least one channel (53).
9. The fuel delivery device (100) according to claim 8, characterized in that the at least one channel (53) can be opened or closed by means of a suction valve element (140).
10. The fuel delivery device (100) as claimed in claim 9, characterized in that the suction valve element (140) is surrounded in the intake chamber (48) by a sleeve element (36), on which a spring (38) is supported and which spring (38) loads the suction valve element (140) with a force in the direction of the intake chamber (48).
11. The fuel delivery device (100) as claimed in one of the preceding claims, characterized in that a further delivery pump (34) is arranged in the fuel tank (30), which pump delivers fuel from the fuel tank (30) via the inlet line (18) into the intake chamber (48) of the high-pressure delivery pump (1).
12. A method (800) for operating a fuel delivery device (100) according to one of the preceding claims, characterized by the following steps:
a. determining (80) a predetermined threshold value for the gaseous component of the cryogenic fuel in the high-pressure delivery pump (1);
b. determining (81) a gaseous component of the cryogenic fuel in the high-pressure delivery pump (1) during operation of the high-pressure delivery pump (1);
c. comparing (82) the determined gaseous component of the cryogenic fuel with the predetermined threshold;
d. the switching valve (70) is actuated (83) as a function of the gaseous fraction of the cryogenic fuel in the high-pressure delivery pump (1) in such a way that
-when the gaseous component of the cryogenic fuel is greater than the predetermined threshold: opening (84) a connection between the second line section (221) and the fuel tank (30);
-when the gaseous component of the cryogenic fuel is less than the predetermined threshold: closing (85) the connection between the second line section (221) and the fuel tank (30);
e. repeating (86) said steps b to d periodically.
13. The method (800) according to claim 12, wherein the predetermined threshold value is determined by an operating function of the high-pressure delivery pump (1).
CN201910619357.0A 2018-07-10 2019-07-10 Fuel delivery device for cryogenic fuels and method for operating same Active CN110700969B (en)

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