CN111868370B - Fuel delivery device for cryogenic fuels - Google Patents

Fuel delivery device for cryogenic fuels Download PDF

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Publication number
CN111868370B
CN111868370B CN201880091390.4A CN201880091390A CN111868370B CN 111868370 B CN111868370 B CN 111868370B CN 201880091390 A CN201880091390 A CN 201880091390A CN 111868370 B CN111868370 B CN 111868370B
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CN
China
Prior art keywords
pressure
pump
delivery device
suction chamber
fuel delivery
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CN201880091390.4A
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Chinese (zh)
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CN111868370A (en
Inventor
J·弗尔斯特
A·贝特
D·施尼特格
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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
    • F02M21/0218—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
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0236—Multi-way valves; Multiple valves forming a multi-way valve system
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief 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
    • 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
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F04B39/041—Measures to avoid lubricant contaminating the pumped fluid sealing for a reciprocating rod
    • F04B39/047—Sealing between piston and carter being provided by a bellow
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

The invention relates to a fuel delivery device (100) for cryogenic fuels, comprising a tank (30), a high-pressure delivery pump (1) and an inflow line (18) connecting the high-pressure delivery pump (1) to the tank (30). The high-pressure delivery pump (1) has a pump housing (2) which has a stepped longitudinal bore (17) in which a pump piston (4) is arranged in a longitudinally movable manner and which 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 an inflow line (18). The pump piston (4) has a guide section (19) in the longitudinal bore (17), a leakage gap being formed between the guide section (19) and the longitudinal bore (17), wherein the low-pressure region (26) is connected to a return line (22) formed in the pump housing (2). Furthermore, the return line (22) can be connected to a suction chamber (48).

Description

Fuel delivery device for cryogenic fuels
Technical Field
The present invention relates to a fuel delivery device for cryogenic fuels according to the preamble of claim 1. The fuel delivery device is used, for example, in internal combustion engines of motor vehicles which are operated with cryogenic fuel, in particular natural gas.
Background
DE 102016210734 describes a fuel supply device for cryogenic fuels. The fuel delivery device has a tank container and a high-pressure delivery pump with a first drive, which is designed to deliver liquid fuel stored in the tank container against the 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 to the pressure prevailing in the tank container, wherein the pressure side of the low-pressure delivery pump is connected to the suction side of the high-pressure delivery pump.
The different pressure relationships in the high-pressure delivery pump provide a sealing device which separates the different pressure regions 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 tank via a return line. However, this leads to the tank becoming hot and thus to a pressure rise, so that, when a limit pressure is exceeded, a pressure-limiting valve arranged in the tank opens and thus discharges harmful substances into the surroundings.
Disclosure of Invention
Compared with the prior art, the fuel delivery device according to the invention, which has the features of the characterizing portion of claim 1, has the following advantages: although the high-pressure leakage is introduced back into the fuel circuit of the high-pressure delivery pump, the introduction of the high-pressure leakage into the tank is minimized, so that no gaseous fuel is discharged into the surroundings.
For this purpose, the fuel supply device for cryogenic fuels has a tank, a high-pressure feed pump and an inflow line connecting the high-pressure feed pump to the 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 furthermore 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 inflow line. The pump piston has a guide section in the longitudinal bore, between which a leakage gap is formed. Furthermore, the low-pressure region can be connected to a return line formed in the pump housing and which can be connected to the suction chamber.
The high-pressure leakage in the pump housing can therefore be led directly back into the fuel circuit of the high-pressure delivery pump via the return line, without the tank being loaded for this purpose. Thereby, neither heating nor pressure increase of the tank takes place, so that it is not necessary to discharge fuel from the tank into the surroundings. Furthermore, this arrangement allows a more robust design of the device and improves the parking time of the vehicle after parking. Furthermore, there is a greater degree of freedom in the design of the pump concept, as a result of which the adjustment concept of the fuel delivery device as a whole is simplified.
In a first advantageous development of the invention, it is provided that a switching valve is arranged in the return line, by means of which the return line can be connected to the suction chamber or to the tank. Thus, for example, a suction chamber on a high-pressure delivery pump can be relieved when the gas fraction is too high and high-pressure leaks can be returned to the tank by means of the switching valve.
In a further embodiment of the inventive concept, it is advantageously provided that an overpressure valve is arranged in the return line, which overpressure valve releases the connection in the direction of the suction chamber or the switching valve when the pressure in the return line is higher than the pressure in the suction chamber or the tank. Thus, the high-pressure leakage can be conducted via the return line in the direction of the suction chamber or the reversing valve. Advantageously, the pressure in the low-pressure region, in the tank or in the suction chamber is at most between 25 and 30 bar.
In an advantageous embodiment, it is provided that the low-pressure region is sealed off from the high-pressure chamber by means of a first seal, wherein a maximum pressure of 600bar prevails in the high-pressure chamber. The first seal advantageously comprises a plurality of piston ring elements or is configured as a gap seal. Thus, sealing of the high-pressure chamber from the low-pressure region can be achieved in a structurally simple manner.
In a further embodiment of the invention, it is advantageously provided that the low-pressure region is sealed off from the ambient pressure region formed in the longitudinal bore by means of a second seal. The second seal advantageously comprises one or more sealing rings or is designed as a diaphragm bellows. The sealing of the low-pressure region from the surrounding pressure region can thus be achieved in a structurally simple manner.
In an advantageous embodiment, the pump piston is acted upon by a spring with a force opposing the direction of the suction chamber. Thus, the pump piston may be fixed within the pump housing and may be longitudinally movable due to a pressure difference in the longitudinal bore.
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.
In an advantageous embodiment, the suction valve is surrounded in the suction chamber by a sleeve element, on which the spring is supported and which loads the suction valve with a force in the direction of the suction chamber. The suction valve can thus be pressed in a simple manner towards 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 tank, which pump delivers fuel from the tank via the inflow line into the suction chamber of the high-pressure delivery pump. This makes it possible to achieve a variable arrangement of the high-pressure delivery pump, so that it can be arranged relatively close to the 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:
figure 1 is a longitudinal section of a first embodiment of a fuel delivery device according to the invention,
figure 2 is a longitudinal section of a second embodiment of a fuel delivery device according to the invention,
fig. 3 is a longitudinal section of a third embodiment of a fuel delivery device according to the invention.
Detailed Description
Fig. 1 shows a longitudinal section of a first exemplary embodiment of a fuel supply system 100 according to the invention for a cryogenic fuel (e.g. natural gas). The fuel supply device 100 has a tank 30, a high-pressure delivery pump 1, and an inflow line 18 connecting the tank 30 and the high-pressure delivery pump 1.
Tank 30 is used to store fuel cooled to, for example, -110 c or less. To this end, the cabinet 30 has an inner cabinet 301 and an outer cabinet 302 separated by an intermediate space 303. The intermediate space 303 is usually evacuated so that no heat input from the surroundings into the tank 30 occurs. The inner tank 301 is filled with the liquid part 32 of the fuel up to the filling level 51. Above the filling level 51, the fuel is present in its gaseous phase 31.
The tank 30 is traversed in particular by a delivery pump 34 in the liquid part of the fuel, which delivers the fuel from the tank 30 via the inflow line 18 in the direction of the high-pressure delivery pump 1. In the inflow line 18, a shut-off valve 44 is arranged, which is closed when the fuel delivery device 100 is not in operation, in order to prevent the gaseous part of the fuel from flowing back from the high-pressure delivery pump 1 into the tank 30. Furthermore, the tank 30 comprises a pressure limiting valve 45, so that gas can be discharged into the surroundings when the maximum limit pressure in the 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 the end 46, which can be connected to a high-pressure reservoir by means of a line 16 by means of an overpressure valve 52.
Furthermore, a suction chamber 48 is formed in the longitudinal bore 17, which is connected to the inflow line 18 and from which two channels 53 lead into the high-pressure chamber 12. A longitudinally movable suction valve 14, which has a guide section 55 in the longitudinal bore 17 and protrudes with a disk-shaped end 54 into the high-pressure chamber 12, is arranged in the suction chamber 48. In the suction chamber 48, the suction valve 14 is enclosed by and fixedly connected to the sleeve element 36, on which the spring 38 is supported on one side. The spring 38 is supported on the other side on the pump housing 2 and presses the suction valve 14 against a valve seat 56 formed in the pump housing 2, so that the suction valve 14 closes off the passage 53 with its disk-shaped end 54.
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 is connected to the suction chamber 48 by means of an overpressure valve 20. The pump piston 4 is surrounded by a first seal 10, which is designed here as a piston ring, by which the high-pressure chamber 12 is sealed off from the low-pressure region 26, so that fuel can pass from the high-pressure chamber 12 into the low-pressure region 26 only via a leakage gap. On the side facing away from the high-pressure chamber 12, the low-pressure region 26 adjoins a surrounding pressure region 25 of, for example, 1bar, wherein the low-pressure region 26 is sealed off from the surrounding pressure region 25 by means of a second seal 8, which is in the form of a sealing ring here. 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 suction chamber 48 in the control chamber 47, wherein the fuel pressure in the control chamber 47 can be relieved via the channel 5. Control chamber 47 is sealed off from ambient pressure region 25 by seal 57. Furthermore, a spring 24 is arranged in the control chamber 47, which spring acts on the pump piston 4 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 tank 30 via the inflow line 18 in the direction of the suction chamber 48 of the high-pressure delivery pump 1. The pressure of the liquid fuel delivered 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, the fuel is conveyed by the high-pressure delivery pump 1 and compressed to the system pressure mentioned, for example, to 500 bar. The compressed fuel can then be supplied to an injection valve of an internal combustion engine, for example.
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 suction chamber 48 and thus into the fuel circuit of high-pressure feed pump 1. An overpressure valve 20 is arranged in the return line 22, which releases the connection in the direction of the suction chamber 48 when the pressure in the return line 22 is higher than the pressure in the suction chamber 48. Thus, the fuel accumulated by the leakage gap 190 can be received in the return line 22 and can be conducted back into the fuel circuit of the high-pressure delivery pump 1, without being conducted back into the tank 30.
Fig. 2 shows a second exemplary embodiment of a fuel delivery device 100 according to the invention in a longitudinal section. Components having the same function are designated with the same reference numerals as in fig. 1. The second exemplary embodiment corresponds to the first exemplary embodiment to the greatest possible extent in terms of construction and mode of operation, wherein the two exemplary embodiments differ in terms of the configuration of the return line 22. In the second exemplary embodiment, a switching valve 50 is additionally arranged in the return line 22, by means of which the return line 22 can be connected either to the suction chamber 48 or to the tank 30. In certain operating states, for example at the start of operation or in partial load regions with small delivery volumes in the high-pressure delivery pump 1, the return of fuel from the low-pressure region 22 into the suction chamber 48 leads to an excessively high gaseous fraction of the fuel. In this case, the introduction of fuel back into the tank can be facilitated by the diverter valve 50.
Fig. 3 shows a third exemplary embodiment of a fuel delivery device 100 according to the invention in a longitudinal section, wherein this exemplary embodiment corresponds to the second exemplary embodiment of fig. 2, with the exception of the configuration of the first seal 10 and the second seal 8. The first seal 10 is designed here as a gap seal. While the second seal 8 is designed as a diaphragm bellows which separates a further low-pressure region 60 (instead of the ambient pressure region 25 in fig. 2) from the control chamber 47. The first low-pressure region 26, which is also connected to the return line 22, is connected to the further low-pressure region 60 via a throttle 65 arranged between the longitudinal bore 17 and the pump piston 4. Therefore, the amount of leakage from the leakage gap 190 in the direction of the return line 22 can be changed in a simple manner.

Claims (13)

1. A fuel delivery device (100) for cryogenic fuel, having a tank (30), a high-pressure delivery pump (1) and an inflow line (18) connecting the high-pressure delivery pump (1) to the 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) bounded by an end (46) of the pump piston (4), a low-pressure region (26) formed between the longitudinal bore (17) and the pump piston (4) and a suction chamber (48) connected to the inflow line (18), wherein the pump piston (4) has a guide section (19) in the longitudinal bore (17), a leakage gap being formed between the guide section (19) and the longitudinal bore (17), wherein the low-pressure region (26) is connected to a return line (22) formed in the pump housing (2), wherein the return line (22) can be connected to the suction chamber (48),
characterized in that the pump piston (4) is arranged with its end facing away from the suction chamber (48) in a control chamber (47), wherein the control chamber (47) is sealed by means of a second seal (8) with a further low-pressure region (60) which is connected to the low-pressure region (26) via a throttle (65) arranged between the longitudinal bore (17) and the pump piston (4).
2. The fuel delivery device (100) as claimed in claim 1, characterized in that a switching valve (50) is arranged in the return line (22), by means of which switching valve the return line (22) can be connected to the suction chamber (48) or to the tank (30).
3. The fuel delivery device (100) as claimed in claim 2, characterized in that an excess pressure valve (20) is arranged in the return line (22), which excess pressure valve releases the connection in the direction of the suction chamber (48) or the changeover valve (50) when the pressure in the return line (22) is greater than the pressure in the suction chamber (48) or the pressure in the tank (30).
4. Fuel delivery device (100) according to claim 3, characterized in that the pressure in the low-pressure region (26), the pressure in the tank (30) or the pressure in the suction chamber (48) is at most between 25 and 30 bar.
5. The fuel delivery device (100) according to one of the preceding claims, characterized in that the low-pressure region (26) is sealed off from the high-pressure chamber (12) by means of a first seal (10), wherein a maximum pressure of 600bar is present in the high-pressure chamber (12).
6. The fuel delivery device (100) of claim 5, wherein the first seal (10) comprises a plurality of piston ring elements.
7. The fuel delivery device (100) according to claim 5, characterized in that the first seal (10) is configured as a gap seal.
8. The fuel delivery device (100) according to claim 1, wherein the second seal (8) is configured as a membrane bellows.
9. 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).
10. 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).
11. The fuel delivery device (100) according to claim 10, characterized in that the at least one channel (53) can be opened or closed by means of a suction valve (14).
12. The fuel delivery device (100) as claimed in claim 11, characterized in that the suction valve (14) is surrounded in the suction chamber (48) by a sleeve element (36), on which a spring (38) is supported and which spring (38) loads the suction valve (14) with a force in the direction of the suction chamber (48).
13. The fuel delivery device (100) according to one of the preceding claims, characterized in that a further delivery pump (34) is arranged in the tank (30), which pump delivers fuel from the tank (30) via the inflow line (18) into a suction chamber (48) of the high-pressure delivery pump (1).
CN201880091390.4A 2018-01-17 2018-12-20 Fuel delivery device for cryogenic fuels Active CN111868370B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102018200715.2 2018-01-17
DE102018200715.2A DE102018200715A1 (en) 2018-01-17 2018-01-17 Fuel delivery device for cryogenic fuels
PCT/EP2018/086317 WO2019141486A1 (en) 2018-01-17 2018-12-20 Fuel delivery device for cryogenic fuels

Publications (2)

Publication Number Publication Date
CN111868370A CN111868370A (en) 2020-10-30
CN111868370B true CN111868370B (en) 2022-05-24

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CN (1) CN111868370B (en)
DE (1) DE102018200715A1 (en)
WO (1) WO2019141486A1 (en)

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CN114017311B (en) * 2021-11-08 2023-09-26 西南石油大学 Long plunger shaft lubricating and sealing structure for hydraulic end of fracturing pump

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