EP2143946A1 - Agencement de pompe - Google Patents

Agencement de pompe Download PDF

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Publication number
EP2143946A1
EP2143946A1 EP09100350A EP09100350A EP2143946A1 EP 2143946 A1 EP2143946 A1 EP 2143946A1 EP 09100350 A EP09100350 A EP 09100350A EP 09100350 A EP09100350 A EP 09100350A EP 2143946 A1 EP2143946 A1 EP 2143946A1
Authority
EP
European Patent Office
Prior art keywords
pump
cylinder
fluid
cavity
drive shaft
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09100350A
Other languages
German (de)
English (en)
Inventor
Uwe Nigrin
Ngoc-Tam Vu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2143946A1 publication Critical patent/EP2143946A1/fr
Withdrawn legal-status Critical Current

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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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/0536—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
    • F04B11/0075—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons connected in series
    • 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
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • 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
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • the invention relates to a pump arrangement for conveying a fluid.
  • Fuel injection systems of internal combustion engines have a high-pressure accumulator near the engine or a storage line from which or from which the individual fuel injection valves are fed.
  • This high-pressure accumulator is often referred to as common rail.
  • the pumps, which supply the high-pressure accumulator, should be able to provide the necessary volume flow and the required fluid pressure precisely and efficiently and at the same time have a small installation size.
  • Such fuel injection systems usually have a prefeed pump, with which fuel can be conveyed from a fuel tank to the suction side of a high-pressure pump.
  • One of the feed pump hydraulically downstream high-pressure pump then delivers fuel into a fuel storage, from where it can be distributed to be coupled to the fuel reservoir hydraulically coupled injectors.
  • a pump arrangement for conveying a fluid comprises a housing body with a crank chamber.
  • a drive shaft is arranged, which can drive a pump unit.
  • the pump unit has a cylinder housing which surrounds a cylinder space.
  • a pump piston is arranged, which is in operative connection with the drive shaft.
  • the pump arrangement comprises a further pump unit drivable by the drive shaft.
  • the further pump unit has a further cylinder housing, which surrounds a further cylinder space.
  • In the other cylinder space axially movable another pump piston is arranged.
  • the other pump piston is in operative connection with the drive shaft.
  • the pump unit and the further pump unit are hydraulically coupled and the further pump unit is connected downstream of the pump unit hydraulically.
  • the pump unit may have at least one turn another pump piston, which is in operative connection with the drive shaft.
  • another pump piston which is in operative connection with the drive shaft.
  • the drive shaft may have at least one eccentric portion which is surrounded by a round lifting ring.
  • the round cam ring is coupled to the pump piston. Between the eccentric portion and the cam ring, a sliding bearing can be arranged.
  • the cam ring may have a recess for supplying the fluid to the sliding bearing.
  • the pump piston may have a recessed area surrounding a cavity for supplying fluid with the cylinder housing.
  • the pump piston may surround a supply line for supplying fluid into the cylinder space, which is hydraulically connected to the cavity is coupled.
  • a relatively simple fluid guide in the pump assembly is given.
  • the cylinder housing may be surrounded by the housing body, wherein the cylinder housing and the housing body surrounding a further cavity for the discharge of fluid, so that the further cavity between the cylinder housing and the housing body is arranged.
  • the further cavity may be formed so that when fluid is disposed therein, the fluid damps movement of the pump piston. So a relatively simple damping of the pump piston is possible.
  • the cylinder housing may surround a drain line for discharging fluid from the cylinder space.
  • the drain line can be hydraulically coupled to the further cavity, wherein the drain line with the cylinder chamber at an angle less than or equal to 90 °.
  • the cylinder housing may in turn surround another cavity, which is hydraulically coupled to the drain line, wherein in the turn further cavity at least one means for damping a movement of the pump piston is arranged.
  • the at least one damping means may comprise at least one spring.
  • the at least one damping means may also comprise at least one membrane.
  • FIG. 1 shows a pump assembly 100 comprising a housing body 101.
  • the housing body 101 surrounds a crank chamber 102.
  • a drive shaft 103 is arranged in the crank chamber 102.
  • the drive shaft has an eccentric portion 104.
  • the pump arrangement 100 comprises a pump unit 110 which is at least partially surrounded by the housing body 101.
  • the pump unit 110 has a cylinder housing 111 which surrounds a cylinder chamber 112.
  • a pump piston 113 is movably arranged.
  • the pump piston 113 is in communication with the eccentric portion 104 of the drive shaft 103.
  • the pump arrangement 100 comprises a further pump unit 120.
  • the further pump unit 120 has a cylinder housing 121 which surrounds a cylinder space 122.
  • a pump piston 123 is movably arranged in the cylinder chamber 122.
  • the pump piston 123 is connected to the drive shaft 103 and another eccentric portion of the drive shaft in operative connection.
  • the pump unit 110 and the pump unit 120 are hydraulically coupled with each other.
  • the pump unit 120 is connected downstream of the pump unit 110 hydraulically.
  • the drive shaft 103 is rotatably supported in the crank chamber 102.
  • the drive shaft has in the sections where it can have contact with the pump piston, each having an eccentric shape.
  • the drive shaft may also be a camshaft.
  • the number of delivery and compression strokes on the number of cams can be specified.
  • the number of conveying or compression strokes corresponds to the number of cams.
  • the pump unit 110 is configured to deliver fluid from a fluid tank.
  • the pump unit 110 is configured to deliver a fuel from a fuel tank.
  • the pump unit 110 is in one embodiment a prefeed pump of a diesel engine.
  • the pump unit 120 is configured to apply a higher pressure to fluid provided by the pump unit 110.
  • the pump unit 120 delivers fluid to a high pressure tank.
  • the pump unit 120 supplies diesel through a supply line to a pressure accumulator through the pump unit 120. From the pressure accumulator, the fuel can be guided, for example, to injectors and injected from these into combustion chambers of an internal combustion engine.
  • the pump unit 120 comprises two or more pump pistons, which are in operative connection with the drive shaft 103.
  • the pump unit 110 can also comprise two or more pump pistons.
  • the pump assembly 100 may include two or more pump units comparable in construction and function to the pump unit 110.
  • the pump units of the pump arrangement are designed as piston pumps.
  • FIG. 2 shows a housing body 201 of a pump assembly, as related to FIG. 1 described.
  • the housing body 201 surrounds a crank chamber 202, in which a drive shaft 203 is rotatably mounted.
  • the drive shaft 203 has an eccentric portion 204.
  • a cam ring 205 is arranged, which is coupled via a slide bearing 206 with the eccentric portion 204.
  • the lifting ring 205 has a recess 207, so that fluid can pass through the lifting ring 205 to the sliding bearing 206 in order to lubricate this.
  • the housing body 201 surrounds a recess in which a pump unit 210 is arranged.
  • the pump unit 210 includes a cylinder housing 211 surrounding a cylinder space 212.
  • a pump piston 213 is movably arranged, which is in operative connection with the drive shaft 203.
  • the pump piston 213 has a recessed portion 214 which is coupled to the drive shaft 203.
  • the recessed portion 214 and the cylinder housing 211 surround a cavity 215.
  • the pump piston 213 surrounds at the recessed portion 214 a supply line 217 which is hydraulically coupled to the cavity 215.
  • the cylinder housing surrounds a drain line 216 which is hydraulically coupled to a cavity 208.
  • the cavity 208 is surrounded by the housing body 201 and the cylinder housing 211, so that the cavity 208 is disposed between the cylinder housing and the housing body.
  • the cylinder housing 211, the cylinder space 212 and the pump piston 213 are coaxially arranged in the pump unit.
  • the cylinder housing is formed of a metal, such as aluminum or steel.
  • the cylinder housing may also be formed from a plastic.
  • the pump piston 213 is mounted axially movable in the cylinder chamber of the cylinder housing and coupled to the drive shaft. In order to be able to fill the cylinder space with fluid, the pump piston 213 has the supply line 217.
  • the drain line 216 To be able to eject fluid from the cylinder chamber, the pump unit, the drain line 216.
  • the drain line 216 is hydraulically coupled via the cavity 208 and other lines with at least one further piston pump.
  • the lifting ring 205 which is arranged on the eccentric portion 204, has a common contact surface with the recessed portion 214 of the pump piston 213.
  • the lifting ring 204 is round, for example annular.
  • the slide bearing 206 is lubricated, for example with fluid that passes through the recess 207 from the crank chamber 202 to the sliding bearing 206.
  • Pump piston 213 and cam 205 move relative to each other as little as possible.
  • the stroke volume of the pump unit can be chosen to be relatively small, for example 1.8 cm 3 .
  • a stroke volume variation of the pump unit can be generated via different eccentricities.
  • the eccentric portion of the drive shaft is stepped in three stages.
  • the crankcase 202 may be terminated by an integral housing body 201 at one end of the drive shaft 203 where the eccentric portion 204 is disposed. It can also, a closing element are attached to the housing body 201, which closes the crank chamber 202.
  • the terminating element is coupled to the housing body 201 via a screw connection.
  • the cavity 208 may be designed with a correspondingly large volume.
  • the drain line 216 may also have an increased diameter to obtain an increased volume.
  • the fluid contained in the enlarged volume of the drain line 216 or in the cavity 208 may damp movement of the pump piston 213.
  • a ringing of the pump piston 213 can be prevented.
  • the drain line 216 may include an angle of 90 ° with the cylinder space as in the embodiment shown.
  • the drain line 216 may include any angle with the cylinder space, in particular an angle between 0 ° and 90 °.
  • the damping of the pump piston 213 can be further improved.
  • crank chamber 202 is fluid, for example, to lubricate bearings of the drive shaft 203.
  • This fluid can enter the cavity 215. From there it can reach the cylinder space 212 via the supply line 217.
  • the fluid from the crank chamber 202 or the cavity 215 can be acted upon by the pump unit 210 with a higher pressure than it has in the crank chamber 202 and fed to a further pump, which can apply a higher pressure again.
  • the pump piston 213 In operation, by a rotational movement of the drive shaft 203, the pump piston 213 is moved radially toward the drive shaft by the eccentric shape of the portion 204. In this case, the cylinder chamber 212 is filled with fluid. The fluid is over the supply line 217 and the cavity 215 from the crank chamber 202 sucked into the cylinder chamber 212. As a result of the further rotational movement of the drive shaft, the pump piston is moved axially away from the drive shaft and thereby compresses the fluid located in the cylinder chamber. The compressed fluid may be expelled via drain line 216 and cavity 208 following the compression stroke. If the pump unit is a prefeed pump of an injection system of an internal combustion engine, the pressurized fluid can be fed to a further pump, which can deliver the fluid at a higher pressure to a high-pressure fuel reservoir, the so-called common rail.
  • FIG. 3 shows a pump unit 300.
  • the pump unit 300 has a cylinder housing 301.
  • a pump piston 303 is arranged to be movable.
  • the cylinder housing 301 surrounds a cavity 305 with a recessed area 304 of the pump piston 303.
  • the cavity 305 is hydraulically arranged on the suction side of the pump unit 300.
  • the cylinder housing 301 further surrounds a drain line 306 through which fluid can be removed. Hydraulically connected to the drain line 306 is a cavity 307 which is surrounded by the housing body 301.
  • a damping means 308 is arranged in the cavity 307.
  • the drain line 306 and the cavity 307 are arranged downstream of the cylinder chamber 302 hydraulically.
  • the cavity 307 is arranged so that when fluid is disposed therein, movement of the pump piston 303 is damped by the fluid.
  • active damping elements can be arranged in the cavity 307.
  • a spring for damping a movement of the pump piston 303 is arranged in the cavity 307.
  • a diaphragm for damping a movement of the pump piston 303.
  • the cylinder housing 301 which comprises aluminum or plastic, for example, is arranged to be arranged on a pump arrangement.
  • the pump unit 300 or the cylinder housing 301 is flanged to the pump assembly.
  • the cylinder housing 301 may also be threaded to be bolted to the pump assembly.
  • the pump unit 300 may also be coupled to the pump assembly via screw members.
  • FIG. 4 shows a pump unit 400.
  • a pump piston 403 is movably arranged in a cylinder space 402.
  • the cylinder space 402 is surrounded by a cylinder housing 401.
  • the pump piston 403 closes with the cylinder housing 401 or the cylinder chamber 402 relatively close to a fluid.
  • the pump piston 403 has a recessed portion 404.
  • the pump piston 403, together with the recessed portion 404, surrounds a cavity 405 together with the cylinder housing 401.
  • the cylinder space 402 is hydraulically coupled to the cavity 405 via a recess in the recessed area 404.
  • Downstream of the cylinder chamber 402 is a drain line 406, which is surrounded by the cylinder housing 401.
  • the cylinder housing 401 surrounds a cavity 407 which is hydraulically coupled to the cylinder space 402 and the drain line 406.
  • At least one damping means 408 may be arranged in the cavity 407.
  • the damping means 408 is arranged to damp a movement of the pump piston 403.
  • the cylinder housing 401 is arranged, the pump unit 400 to a pump assembly via a crimp connection to couple.
  • the pump unit may also be coupled to the pump assembly via a flange connection.
  • the cylinder housing 401 includes, for example, aluminum or plastic.
  • the drain line 406 may include an angle of about 90 ° with the cylinder 402 as in the embodiment shown. This corresponds to a substantially parallel alignment with a line, not shown, which leads to a volume flow valve.
  • the drain line can also be arranged at a different angle.
  • the drain line 406 can not be arranged transversely to the cylinder space 402, so that it is not parallel to the line to the flow control valve. Thereby, a further damping of a movement of the pump piston 403 can be made possible and a spiral flow of the fluid can be generated.
  • It can also be arranged at least one pressure relief valve that has a damping effect.
  • the construction shown in particular the promotion of fluid at low speeds is improved. By a relatively high efficiency of such a pump unit energy losses are reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP09100350A 2008-07-11 2009-06-30 Agencement de pompe Withdrawn EP2143946A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810032740 DE102008032740A1 (de) 2008-07-11 2008-07-11 Pumpenanordnung

Publications (1)

Publication Number Publication Date
EP2143946A1 true EP2143946A1 (fr) 2010-01-13

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ID=41259041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09100350A Withdrawn EP2143946A1 (fr) 2008-07-11 2009-06-30 Agencement de pompe

Country Status (2)

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EP (1) EP2143946A1 (fr)
DE (1) DE102008032740A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109611308A (zh) * 2018-11-24 2019-04-12 李军 一种高压变量柱塞泵

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018108638B3 (de) 2018-04-11 2019-05-16 Hoerbiger Automatisierungstechnik Holding Gmbh Hydrauliksystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704080A (en) * 1970-07-22 1972-11-28 Grosvenor M Cross Fluid engine
DE2725464A1 (de) * 1977-06-04 1978-12-14 Mueszeripari Muevek Lab Pulsationsfreie zumesspumpe
DE8912797U1 (de) * 1989-10-28 1989-12-28 Vickers Systems GmbH, 6380 Bad Homburg Radialkolbenpumpe
EP0692621A1 (fr) * 1994-07-15 1996-01-17 RIVAPOMPE Société Anonyme dite: Pompe mécanique à membrane, à pression augmentée, munie d'un régulateur de pression, pour l'alimentation des moteurs thermiques et en particulier de moteurs à injection
DE19755678A1 (de) * 1996-12-16 1998-07-23 Unisia Jecs Corp Pumpenvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704080A (en) * 1970-07-22 1972-11-28 Grosvenor M Cross Fluid engine
DE2725464A1 (de) * 1977-06-04 1978-12-14 Mueszeripari Muevek Lab Pulsationsfreie zumesspumpe
DE8912797U1 (de) * 1989-10-28 1989-12-28 Vickers Systems GmbH, 6380 Bad Homburg Radialkolbenpumpe
EP0692621A1 (fr) * 1994-07-15 1996-01-17 RIVAPOMPE Société Anonyme dite: Pompe mécanique à membrane, à pression augmentée, munie d'un régulateur de pression, pour l'alimentation des moteurs thermiques et en particulier de moteurs à injection
DE19755678A1 (de) * 1996-12-16 1998-07-23 Unisia Jecs Corp Pumpenvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109611308A (zh) * 2018-11-24 2019-04-12 李军 一种高压变量柱塞泵

Also Published As

Publication number Publication date
DE102008032740A1 (de) 2010-01-14

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