Classifications

• • 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
  • 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
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/02—Packing the free space between cylinders and pistons
• • 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
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/14—Pistons, piston-rods or piston-rod connections
• • 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
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/14—Pistons, piston-rods or piston-rod connections
  • F04B53/144—Adaptation of piston-rods
• • 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
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
  • F04B53/162—Adaptations of cylinders
  • F04B53/164—Stoffing boxes
• • 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
  • F04B9/105—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 reciprocating movement of the pumping member being obtained by a double-acting liquid motor
• • 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

Definitions

• the invention relates to a feed pump for cryogenic fuels according to the preamble of claim 1.
• Tank container for the cryogenic fuel protrudes.
• the known feed pump passes through a wall of the tank. The outside of the
• Tank container arranged drive the feed pump is exemplified by a hydraulic drive.
• This hydraulic drive acts on a pump piston connected to a piston rod, which on the suction side of the
• Feed pump is disposed within the tank container.
• Pump piston is the cryogenic fuel in a pump room of the
• the cryogenic fuel is, for example, natural gas that has been cooled within the tank to a temperature of, for example, less than -1 10 ° C so that the natural gas can be stored in liquid form in the tank.
• Feed pumps is that the piston rod usually via one or more, arranged in the axial direction of the piston rod in a row
• Sealing devices is sealed. These sealing devices are intended to prevent the fuel from escaping along the piston rod from the region of the delivery pump filled with the fuel. However, these sealing devices are also characterized by the fact that they are usually not 100% tight.
• the feed pump for cryogenic fuels having the features of claim 1 has the advantage that an optimized sealing of the piston rod relative to the pump housing is achieved. As a result, the amount of fuel discharged via one or more sealing devices to the environment can be reduced or, in the best case, a complete sealing of the piston rod can be achieved, so that no fuel is released into the environment.
• the invention is based on the idea of designing a sealing device in such a way that it encloses the piston rod at least indirectly, sealingly, on its outer circumference at an (end) region, wherein it is connected to the piston rod at its outer circumference. Thereby, a relative movement between the sealing device and the outer circumference of the piston rod is prevented, as would normally be present in the usual sealing devices in the form of O-rings or the like.
• This dense and firm installation of the sealing device is made possible by a bellows element whose not connected to the piston rod other (end) is in turn firmly and sealingly connected to the longitudinal bore, to there also a relative movement between the sealing device and the pump housing or the To avoid longitudinal drilling.
• vaporized fuel entering the bellows space via a seal from the pump chamber is returned to the inner tank can be, so that a pressure balance between the tank and the
• Connecting cable is connected to an inner tank.
• the sealing of the bellows element to the longitudinal bore or the bellows space on the outer diameter of the bellows element is preferably carried out by a
• Shape of a fixedly arranged O-ring
• Compressor piston side facing away between the piston rod and the longitudinal bore a leakage chamber connects, which is vented to the environment.
• the leakage space is axially limited by two, the piston rod comprising additional sealing elements.
• bellows element communicates via a vent in the pump housing to the environment to prevent reciprocation of the piston rod.
• bellows in particular membrane bellows or wave bellows come to
• Piston rod at one end portion is tightly welded. Such welding can be done for example via a laser beam device.
• Fig. 1 is a system view of a fuel delivery system with a
• FIG. 2 shows a portion of the feed pump of FIG. 1 in an enlarged
• a fuel delivery system 100 for cryogenic fuel 1 is shown.
• the fuel 1 is, in particular, natural gas and the fuel delivery system 100 is preferably used
• the fuel delivery system 100 has a tank container 5, which is the
• the tank container 5 an inner tank 6, of an outer shell 7 to form a
• Interspace 8 is surrounded.
• the gap 8 is usually evacuated in order to prevent heat transfer or heat input from the environment into the cooled-down fuel 1.
• Fuel 1 to a filling level 9 Above the filling level 9, the fuel 1 is present in its gaseous phase.
• the tank container 5 or its inner tank 6 and the outer shell 7 is penetrated by a feed pump 10, which has a pump housing 1 1.
• Pump housing 1 1 is sealed relative to the tank container 5 in the region in which the pump housing 1 1 passes through the wall of the tank container 5. While the suction side of the feed pump 10 is within the
• Tank container 5 in particular below the filling level 9, the pressure side of the feed pump 10 is connected outside of the feed pump 10 with a heater 15.
• the heater 15 is used in a conventional manner to heat the funded by the pump 10 with pressure increase from the tank tank 5 fuel 1, for example, to 60 ° C to him indirectly at least one gas valve (not shown) to supply, either a Intake tract of the internal combustion engine is assigned, or a single combustion chamber of the internal combustion engine.
• the pump housing 1 1 has, for example, two housing parts 16, 17 which adjoin one another in the axial direction, wherein between the two
• Housing parts 16, 17, for example, a seal 18 (Fig. 2) is arranged, which serves to seal the two housing parts 16, 17.
• a seal 18 (Fig. 2) is arranged, which serves to seal the two housing parts 16, 17.
• a longitudinal bore 20 In one housing part 16, which is partially disposed within the tank container 5 and partially outside of the tank 5, a longitudinal bore 20 with
• the pump piston 25 is arranged within the longitudinal bore 20 in a pump chamber 30.
• the pump chamber 30 has on the piston rod 26th
• a suction valve 32 is arranged in the form of a check valve, which is an ejection of fuel 1 prevented from the pump chamber 30 in the direction of the inner tank 6. Furthermore, near the bore portion 31 in the pump housing is a
• the high-pressure bore 33 has a high-pressure valve 35, which on the one hand, a return flow of fuel 1 from the region of
• High-pressure bore 33 in the pump chamber 30 during a suction movement of the pump piston 25 prevents, and on the other hand opens when ejecting fuel 1 from the pump chamber 30 into the high pressure bore 33 from a certain pressure.
• the movement of the pump piston 25 and the drive of the pump 10 can also be done via a pneumatic, electric or other drive. It is only essential that the pump piston 25 is arranged back and forth via the piston rod 26 corresponding to the double arrow 22.
• the hydraulic drive 40 also has, in a known manner, a first switching valve 41 for filling or controlling hydraulic fluid in the direction of two subspaces 43, 44 of the bore 27, the one
• Hydraulic piston chamber 45 forms.
• the first switching valve 41 is part of a hydraulic circuit, which also has a second switching valve 46, a hydraulic pump 47, a radiator 48, a filter 49 and a
• Hydraulic tank 50 includes. By the hydraulic actuators 40 and the enumerated elements is reciprocated in the known manner of the hydraulic piston 28 and thus also via the piston rod 26 of the compressor piston 25 in the direction of the double arrow 22.
• the piston rod 26 is sealed within the longitudinal bore 20 of the first housing part 16 at least by means of three hydraulic seals 51 to 53 relative to the longitudinal bore 20.
• the two hydraulic seals 51, 52 which are axially in relation to Longitudinal axis 21 are arranged spaced from each other, are arranged within a portion of the longitudinal bore 20, which forms a leakage space 55.
• the leakage chamber 55 is connected via a vent hole 56 with the environment.
• the third hydraulic seal 53 is arranged on the side facing the pump piston 25 and axially delimits one
• Near the hydraulic seal 53 opens a connecting hole 59 which connects the bellows space 58 with a region of the inner tank 6, which is arranged above the filling level 9.
• constituents of the fuel 1, which pass through the hydraulic seal 53 into the bellows space 58 and evaporate there, can be returned to the inner tank 6 via the connection bore 59.
• a sealing device 60 in the form of a bellows element 61 is arranged within the bellows space 58.
• the bellows member 61 is formed either as a diaphragm bellows or corrugated bellows and is preferably made of metal.
• the bellows element 61 has a first end region 62 which surrounds the outer circumference of the piston rod 26 on the side facing the pump piston 25.
• the first end region 62 of the bellows element 61 is tightly and firmly connected to the outer circumference of the piston rod 26, for example by a radially encircling one
• the bellows 61 also has on the
• a sealing element is arranged, for example in the form of an O-ring 66, the second end portion 64 of the
• Balgelements 61 seals to the wall of the bellows space 58 and thus to the longitudinal bore 20.
• the interior 67 of the bellows member 61 is connected via a formed in the first housing part 16 bore 68, for example, with the environment.
• the delivery pump 10 described so far can be modified or modified in many ways, without departing from the spirit.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=58609423

Family Applications (1)

Country Status (4)

Cited By (2)

Families Citing this family (4)

Citations (5)

Family Cites Families (4)

• 2016
  • 2016-06-16 DE DE102016210737.2A patent/DE102016210737A1/de not_active Withdrawn
• 2017
  • 2017-04-24 CN CN201780050181.0A patent/CN109563791A/zh active Pending
  • 2017-04-24 WO PCT/EP2017/059651 patent/WO2017215820A1/de unknown
  • 2017-04-24 EP EP17718927.1A patent/EP3472453A1/de not_active Withdrawn

Patent Citations (5)

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