WO2019115161A1 - Procédé pour faire fonctionner une pompe à piston, pompe à piston - Google Patents

Procédé pour faire fonctionner une pompe à piston, pompe à piston Download PDF

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Publication number
WO2019115161A1
WO2019115161A1 PCT/EP2018/081712 EP2018081712W WO2019115161A1 WO 2019115161 A1 WO2019115161 A1 WO 2019115161A1 EP 2018081712 W EP2018081712 W EP 2018081712W WO 2019115161 A1 WO2019115161 A1 WO 2019115161A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
pump
pressure
rear space
space
Prior art date
Application number
PCT/EP2018/081712
Other languages
German (de)
English (en)
Inventor
Christoph Stefan Nagl
Ekkehardt Klein
Robert Adler
Georg Fahrthofer
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2019115161A1 publication Critical patent/WO2019115161A1/fr

Links

Classifications

    • 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
    • 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
    • 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
    • F04B2015/081—Liquefied gases
    • 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 method for operating a piston pump for cryogenic fuels having the features of the preamble of claim 1. Furthermore, the invention relates to a He piston pump for cryogenic fuels.
  • a piston pump for cryogenic fuels, in particular for natural gas, with a reciprocating pump piston is known.
  • the pump piston limits a pump working space, which can be filled with liquid natural gas, so that in the pump working space existing liquid natural gas can be acted upon by a lifting movement of the pump piston with high pressure.
  • At the other end of the pump piston limits a pressure chamber which can be filled with a hydraulic pressure medium to drive the pump piston in a reciprocating motion.
  • an electrical shear, pneumatic or mechanical drive is proposed.
  • the provision of the pump piston of a piston pump can also be hydraulically or mechanically by means of a return spring, in particular a fferendruckfe, caused.
  • the helical compression spring is for this purpose usually supported on Pumpenkol ben, so that additionally act on the pump piston torsional and shear forces.
  • the lateral forces lead to increased wear in the area the guides and / or seals on the pump piston, which in turn has a negative effect on the life of the piston pump.
  • Object of the present invention is to reduce the wear in the range of guides and / or seals of a reciprocating pump piston of a piston pump, so that the life of the piston pump is increased.
  • a method for operating a piston pump for cryogenic fuels which comprises a reciprocating pump piston, which at one end defines a compression space and at the other end a pressure chamber formed in a hollow cylinder.
  • the pressure chamber is acted upon by a hydraulic pressure medium, so that the pump piston moves from a lower end position in the direction of an upper end position.
  • the hydrau lic pressure in the pressure chamber is at least partially degraded and returned to a limited by a shoulder of the pump piston piston back pressure with a pressure that prevails in a tank for storing the cryogenic fuel to reset the pump piston in Bef divellakt the piston pump.
  • the agent can be used who the, which are also used for pressurizing.
  • These means may in particular special include an external hydraulic pump and / or a hydraulic valve.
  • the hydraulic pressure in the pressure chamber must be built as far down in Bef Schollakt the piston pump that acts on the pump piston a force resulting, which is the desired return of the pump piston leads.
  • the hydraulic pressure in the pressure chamber must not generate a back pressure that blocks the desired reset of the pump piston.
  • the resulting force can be influenced by the foundednver ratios on the pump piston.
  • the proposed pneumatic reset replaces a hydraulic or mechanical reset. Compared to the hydraulic return pneu matic provision has the advantage that the circulating amount of the hydraulic medium, which may in particular be an oil is reduced. Due to the ver ringerten oil circulation, the operation of the piston pump is environmentally friendly.
  • the pneumatic reset also has the advantage that act on the pump piston no spring-related torsion and / or shear forces. As a result, the wear in the region of the guides and / or seals on the pump piston can be reduced, which is associated with an increased service life of the piston pump.
  • leakage gas accumulates in the piston rear space, which gas has leaked from the compression space into the piston rear space. That is, the leakage gas is cryogenic fuel from the compression space, which has transitioned from the liquid phase to the gas phase.
  • a certain amount of leakage is always to be accepted, since a sealing of the compression chamber is only possible via dynamically loaded seals, which do not tightly restrain unrestricted. Since there is a connection of the piston rear space with the tank, the amount of leakage reaching the piston rear space can be returned via the connection to the tank, so that this quantity is not lost.
  • piston pump for cryogenic fuels includes a reciprocating pump piston which at one end defines a compression space and the other end formed in a hollow cylinder pressure chamber which is beatable with a hydraulic pressure means beauf.
  • the pump piston has an annular shoulder for limiting a piston rear space, which directly or indirectly via a further piston rear space to a tank for storing the cryogenic fuel is connected, so that the piston rear space for returning the pump piston with the pressure prevailing in the tank can be acted upon.
  • the proposed piston pump is particularly suitable for carrying out the previously described method according to the invention, so that the advantages of the proceedings also result in the operation of a piston pump according to the invention.
  • the piston rear space which is bordered by an annular shoulder of the pump piston be, is preferably formed in the hollow cylinder, in which the pressure chamber is arranged.
  • the piston rear space is formed outside of the hollow cylinder and extends into the hollow cylinder inside.
  • the tank pressure or gas pressure thus acts directly on an end portion of the pump piston at the same time limits the pressure chamber or the drive of the pump piston is used. This means that at the end portion of the pump piston approximately equal effective areas are opposite, the gas pressure side is reduced only by the cross-sectional area of a piston rod of the pump piston.
  • the outer side of the pump piston has a circumferential gas seal associated with the piston rear space and a circumferential hydraulic seal associated with the pressure chamber.
  • the seals are preferably arranged on the outer circumference side on a piston section or piston part, which delimits on the one hand the piston rear space and on the other hand the pressure chamber.
  • the pump piston preferably has a compressor piston, on the one hand limits the compression space and the other hand, the piston rear space or connected to the piston rear space wide ren piston rear space surrounding a piston rod of the pump piston.
  • the Piston back space is therefore separated from the compression chamber only by the Verêtrkol ben the pump piston.
  • the space in the way of leakage from the compression chamber escaping gas thus passes directly into the piston rear chamber or in the interconnected piston rear chambers.
  • the compressor piston is added to form a gap seal in egg nem pump cylinder head, in which the compression space is formed. This means that there is no further sealing measures beyond the gap seal. Thereby, the structure of the piston pump can be simplified, whereby the production costs decrease.
  • a gas line opens, via which the piston rear space is bound to the tank.
  • the gas line can be formed in particular by a bore in a housin seteil of the piston pump. This may in particular be a flange that connects the hollow cylinder with another hollow cylinder.
  • the pump piston is designed in several parts.
  • a piston rod at whose ends in each case a Kol ben is arranged, namely a compressor piston, which limits the compression space be, and a further piston or a piston part which limits the pressure chamber.
  • the pump piston can be easily and inexpensively manufactured in this way who the. Furthermore, the assembly of the piston pump is facilitated.
  • the inventive piston pump 1 shown in the figure is used to supply an internal combustion engine (not shown) of a motor vehicle with a cryogenic fuel, which may be in particular natural gas.
  • the illustrated piston pump 1 has a reciprocating Chen pump piston 2, the head 14 recorded in a pump cylinder 10 at a first end of the compressor piston 10 for limiting a derkopf in Pumpenzylin 14 formed compression chamber 3 has.
  • the compression chamber 3 is filled via a fancy in the pump cylinder head 14 th inflow channel 16 with cryogenic fuel.
  • the existing in the compression chamber 3 fuel is compressed and a likewise memory in the pump cylinder head 14 formed high-pressure channel 17 a buffer memory (not shown) supplied.
  • the pump piston 2 a piston member 20 which is connected to the compressor piston 10 via a piston rod 12 and limited in a hollow cylinder 4 formed pressure chamber 5.
  • the pressure chamber 5 is acted upon by a Hydrauliklei device 18 with a hydraulic pressure medium, so that on the piston part 20, a hydraulic pressure force acts, which drives the pump piston 2 in a Hubbewe tion.
  • the drive in the compression stroke is thus effected via the increasing hydraulic pressure in the pressure chamber 5.
  • the piston part 20 has an outer diameter Di which is larger than an outer diameter D 2 of the piston rod 12.
  • the piston member 20 forms an annular shoulder 6.
  • the ben formed between the Ver Whyrkol 10 and the pump cylinder head 14 gap seal 13 is unable to prevent leakage from the compression chamber 3 in the piston rear chamber 11, so that in the compression stroke of the piston pump 1, the piston rear chamber 11 and the Fill piston rear chamber 7 with leakage gas.
  • the piston return chambers 7, 11 are subjected to a pressure which prevails in a tank 21, in which the cryogenic fuel is stored.
  • the piston return chambers 7, 11 are this device via a Gaslei 15 connected to the tank 21.
  • the gas line 15 is formed as a bore in a flange 19.
  • the anlie on the annular shoulder 6 of the piston member 20 lowing gas pressure causes in Bef divellakt the piston pump acting on the pump piston restoring force, since at the same time the hydraulic pressure in the pressure chamber 5 is built from.
  • the pressure reduction can by means of a hydraulic pump (not shown) rea llibrary, which also serves to pressurize the pressure chamber 5.
  • the return position of the pump piston 2 is therefore pneumatically via the gas pressure in
  • the piston part 20 has on the outer circumference a peripheral gas seal 8 and a circumferential hydraulic seal 9, which in each case seal against the hollow cylinder 4 in the radial direction.

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)
  • Reciprocating Pumps (AREA)
  • Compressor (AREA)

Abstract

L'invention concerne un procédé pour faire fonctionner une pompe à piston (1) pour carburants cryogéniques comprenant un piston de pompe (2) qui peut être animé d'un mouvement alternatif et qui délimite d'une part une chambre de compression (3) et d'autre part une chambre de pression (5), ménagée dans un cylindre creux (4), soumise à l'action d'un fluide hydraulique sous pression dans le temps de compression de la pompe à piston (1), de sorte que le piston de pompe (2) se déplace d'une position finale inférieure en direction d'une position finale supérieure. Selon l'invention, pour le rappel du piston de pompe (2) dans le temps de remplissage de la pompe à piston (1), la pression hydraulique dans la chambre de pression (5) est au moins partiellement relâchée et une chambre de retour de piston (7) délimitée par un épaulement (6) du piston de pompe (2) est soumise à une pression qui règne dans un réservoir (21) pour le stockage du carburant cryogénique. L'invention concerne en outre une pompe à piston (1) pour carburants cryogéniques.
PCT/EP2018/081712 2017-12-11 2018-11-19 Procédé pour faire fonctionner une pompe à piston, pompe à piston WO2019115161A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017222382.0A DE102017222382A1 (de) 2017-12-11 2017-12-11 Verfahren zum Betreiben einer Kolbenpumpe, Kolbenpumpe
DE102017222382.0 2017-12-11

Publications (1)

Publication Number Publication Date
WO2019115161A1 true WO2019115161A1 (fr) 2019-06-20

Family

ID=64477107

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/081712 WO2019115161A1 (fr) 2017-12-11 2018-11-19 Procédé pour faire fonctionner une pompe à piston, pompe à piston

Country Status (2)

Country Link
DE (1) DE102017222382A1 (fr)
WO (1) WO2019115161A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367271A (en) * 1966-03-07 1968-02-06 Nasa Usa Automatic pump
DE2610745A1 (de) * 1976-03-13 1977-09-22 Richard S Pauliukonis Druckverstaerkungspumpe
WO1999010640A1 (fr) * 1997-08-21 1999-03-04 Industrieanlagen-Betriebsgesellschaft Mbh Procede et dispositif permettant le transport et le dosage regles par voie electronique d'agents cryogenes dans le cas de groupes moto-propulseurs
EP2541062A1 (fr) 2011-06-29 2013-01-02 Westport Power Inc. Pompe cryogène

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367271A (en) * 1966-03-07 1968-02-06 Nasa Usa Automatic pump
DE2610745A1 (de) * 1976-03-13 1977-09-22 Richard S Pauliukonis Druckverstaerkungspumpe
WO1999010640A1 (fr) * 1997-08-21 1999-03-04 Industrieanlagen-Betriebsgesellschaft Mbh Procede et dispositif permettant le transport et le dosage regles par voie electronique d'agents cryogenes dans le cas de groupes moto-propulseurs
EP2541062A1 (fr) 2011-06-29 2013-01-02 Westport Power Inc. Pompe cryogène

Also Published As

Publication number Publication date
DE102017222382A1 (de) 2019-06-13

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