EP4345306A1 - Dispositif de pompage - Google Patents

Dispositif de pompage Download PDF

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Publication number
EP4345306A1
EP4345306A1 EP23190280.0A EP23190280A EP4345306A1 EP 4345306 A1 EP4345306 A1 EP 4345306A1 EP 23190280 A EP23190280 A EP 23190280A EP 4345306 A1 EP4345306 A1 EP 4345306A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
fluid
pump piston
pressure
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.)
Pending
Application number
EP23190280.0A
Other languages
German (de)
English (en)
Inventor
Markus Dewes
Thomas Scholl
Sascha THEOBALD
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.)
Hydac Fluidcarecenter GmbH
Original Assignee
Hydac Fluidcarecenter 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 Hydac Fluidcarecenter GmbH filed Critical Hydac Fluidcarecenter GmbH
Publication of EP4345306A1 publication Critical patent/EP4345306A1/fr
Pending 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
    • F04B5/00—Machines or pumps with differential-surface pistons
    • F04B5/02—Machines or pumps with differential-surface pistons with double-acting pistons
    • 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
    • F02M37/16—Feeding by means of driven pumps characterised by provision of personally-, e.g. manually-, operated pumps
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
    • F04B49/24—Bypassing
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/12—Valves; Arrangement of valves arranged in or on 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

Definitions

  • the invention relates to a pump device for fluid, in particular for diesel fuel, with a pump piston which is guided in a pump housing such that it can be moved longitudinally by means of an actuating device and which, depending on its travel position within the pump housing, at least temporarily separates individual pump chambers with different volumes from one another.
  • a filter device is known, in particular intended for use with diesel fuels, with a filter element that can be exchangeably accommodated in a filter housing, wherein a fluid pump device with two pump chambers is present as part of the filter device, which are separated from one another in a fluid-tight manner at least in one of its two travel directions by means of a pump piston that is guided longitudinally in these chambers, wherein a valve is provided for each pump chamber, which opens or closes in the opposite direction to the other valve when the pump device is actuated, and wherein at least one valve is a component of the filter element and, in its open position, passes fluid into its associated pump chamber and, in its closed position, blocks this path.
  • the invention is based on the object of further improving the known device solution regarding pump operation.
  • a pump device having the features of patent claim 1 in its entirety solves this problem.
  • the pump piston has a pressure limiting device which, when a predeterminable pump pressure in one of the pump chambers is exceeded, provides pressure relief for the fluid in the direction of the other pump chamber adjacent to a pump chamber, is a frequently occurring technical problem solved, namely that the pressure that is applied to a fuel system by a hand pump can become unacceptably high, which may result in seals and other components that are sensitive to excessive pressure in the supply system being damaged. This danger is effectively countered with the pressure limiting device according to the invention and unacceptably high pressures during pump operation are certainly avoided.
  • the pump piston is guided longitudinally in the pump housing by means of a sealing device, which has at least one fluid connection which, in a return stroke movement of the pump piston, connects the adjacent pump chambers with one another in a fluid-conducting manner. one of which occupies a noticeably smaller volume and the other a noticeably larger volume. In this way, a possibility is created to fill the pump housing with fluid from an inlet side for the subsequent discharge of the fluid by moving the pump piston in an actuating direction.
  • the respective fluid connection in the pump piston can be covered by a control means which, as a pressure limiting device, releases the respective fluid connection into a pump chamber at a predeterminable pressure threshold value and enables the return flow to the other pump chamber.
  • a control means which, as a pressure limiting device, releases the respective fluid connection into a pump chamber at a predeterminable pressure threshold value and enables the return flow to the other pump chamber.
  • a particularly simple mechanism for the pressure limiting function of the pump device results when an energy storage device, preferably in the form of a compression spring, is used to set the pressure threshold value and a control means is also used which is formed from a control disk whose outer diameter is smaller than the outer diameter of the pump piston that a circumferential annular gap is formed between the control disk and the inner circumferential side of the pump housing.
  • an energy storage device preferably in the form of a compression spring
  • the spring-loaded control disk can initially close fluid connections in the pump piston, so that effective pressure-building pumping by hand in the direction of the delivery side is possible and when the pressure limiting function is triggered, the control disk is opened and the fluid connections then released in this way are released Backflow of high pressure fluid from the delivery side to the relief side of the pump piston within the pump housing.
  • the pump device in a further preferred embodiment of the pump device according to the invention it is provided that after completion of the pumping process, which can include several pump strokes with the pump piston, it is moved into a position within the pump housing in which both pump chambers are released, so that a direct fluid-carrying connection between the inlet of the pump housing and its outlet. As a result, a neutral position is assumed by the pump piston in the pump housing and a main fluid volume flow can flow unhindered from the input side to the output side of the pump housing.
  • the Figure 1 shows the essential components of the pump device in a kind of longitudinal section.
  • the pump device has a pump housing 10 with a partially cup-shaped base housing 12, which is closed fluid-tight to the outside by a cover part 14.
  • a pump piston 16 is guided in a longitudinally movable manner in the pump housing 10 and can be actuated by means of an actuating device designated as a whole by 18.
  • the basic housing 12 has a cylindrical cavity 20, which is viewed in the direction of the Figure 1 Seen to the left, it expands along a conical section 22 into a fluid space 24, the diameter of which is larger than the diameter of the cylindrical cavity 20.
  • the pump piston 16 divides the spaces 20, 22 and 24 shown into two pump spaces, namely one pump space 26 and the other pump chamber 28.
  • the volume of one 26 or the other pump chamber 28 is increased or correspondingly reduced to the same extent.
  • an inlet 30 opens into one cavity 20 in the form of a fluid-carrying channel, which is provided at its free upper end with a check valve 32 of a conventional design.
  • an outlet 34 opens into the expanded fluid chamber 24, again in the form of a fluid channel, which leads to a consumer (not shown in detail), which is connected to the pump device and which can, for example, be part of a conventional (diesel) fuel supply system.
  • the actuating device 18 has an actuating rod 36 which is provided at one free end with a handle 38, for example in the form of an actuating knob or an actuating button. At its other, opposite end, the actuating rod 36 is tapered in diameter and thus merges into a cylindrical pin guide 40 for the pump piston 16.
  • the pin guide 40 which tapers to a point at its free end, has an annular stop disk 42, which is widened compared to the free diameter of the pin guide 40 and thus provides a stop option for the pump piston 16 in its direction of view Figure 1 seen, forms the far left stop position.
  • the pump piston 16 is formed from a disk-shaped, cylindrical plate, which carries a sealing device 46 on the outer circumference in the form of two conventional sealing rings arranged at a distance from one another, which are accommodated in radial grooves of the pump piston 16.
  • the pump piston 16 further comprises at least one continuous axial bore 48, wherein preferably several such axial bores 48 are grouped concentrically around a longitudinal axis 50 of the pump device, which is also simultaneously the actuation axis for the actuation device 18.
  • the respective axial bore 48 is covered by a control means 52 in the form of a control disk 54.
  • the outer diameter of the control disk 54 is smaller than the outer diameter of the pump piston 16, so that a circumferential annular gap 56 is formed between the outer circumference of the control disk 54 and the cylindrical inner circumference of the base housing 12, which includes the cavity 20 in the pump housing 10.
  • the annular gap 56 serves to drain fluid from the one pump chamber 26 when required, which can be determined by means of the Figure 4 will be explained in more detail below, in the direction of the other pump chamber 28, namely via the respective axial bore 48, which is opened by the control disk 54 for a fluid passage.
  • the control disk 54 is supported with one plate side on the associated piston side of the pump piston 16 and with its other side on an energy storage in the form of a compression spring 58.
  • a compression spring 58 For the relevant support with the compression spring 58, it is at its other free end on another stop disk 60 held, which is applied at all times by means of the compression spring 58 to a snap ring 62 which engages in the actuating rod 36.
  • the control disk 54 is placed in a central region on a radial widening 64 in a supporting manner, which extends between the pin guide 40 and the other parts of the actuating rod 36 in the direction of the handle 38, with an associated radial recess 66 in order to guide the widening 64 Pump piston 16 is present. In the position shown after Figure 1 closes the adjacent piston side of the pump piston 16 flush with the contact surface of the widening 64, against which the control disk 54 is placed under the force of the compression spring 58 in a vertical plane.
  • the actuating rod 36 can be moved by means of the handle 38 into a fully retracted position, as shown in the Figure 5 , in which case the handle 38 rests on the cover part 14 and a cylindrical projection 68 of the cover part 14 with an internal thread 70 allows screwing via threaded parts of the handle 38 or the actuating rod 36 (not shown in detail) in this area. In this way, a locked position of the handle 38 together with the actuating rod 36 on the pump housing 10 is achieved and the pump piston 16 completely passes from the cavity 20 into the widened fluid chamber 24. This will also be explained in more detail later. Furthermore, the actuating rod 36 is guided in the cover part 14 along a seal (not shown), of which only the associated annular groove 71 is shown in the figures. In addition, the pump device shown with its essential components implements a pressure limiting device, designated as a whole by 72.
  • the filling of the pump housing 10 is controlled by the piston position after the Figure 2 described in more detail.
  • the handle 38 is moved from its position to the Figure 1 to the right and fluid is brought from the inlet 30 into the other pump chamber 28 via the check valve 32.
  • the actuating rod 36 moves to the right, its widening 64 also takes the control disk 54 to the right, so that fluid passes through the permanently present annular gap 56 into the space created between the control disk 54 and the released piston side of the pump piston 16 and from there through the individual axial bores 58 in the pump piston 16 into the one pump chamber 26. In this way, the one pump chamber 26 is completely filled with fluid in the direction of the outlet 34.
  • the axial bores 48 in the pump piston 16 are closed again by the control slide 54 and the cylindrical pin guide 40 is in accordance with the illustration after the Figure 1 again in its front left position; as in the illustration after the Fig.1 Furthermore, the control slide 54 is held in the position closing the axial bores 48 under the force of the relaxing compression spring 58.
  • the pressure threshold value for opening the pressure limiting device 72 can be specified in this way.
  • the Figure 4 shows, the actuating rod 36 with its cylindrical pin guide 40 remains in a displacement position according to the Figures 1 and/or 3.
  • the pressure limiting device 72 consists, according to its function shown, essentially of the spring-loaded control means 52, which opens or closes the fluid connection in the pump piston in the form of the respective axial bore 48 depending on the pressure situation in the pump housing.
  • the actuating rod or piston rod 36 can be moved as shown in the Figure 5 now move it completely to the left and is screwed using the handle 38 with the internal thread 70 in the projection 68 of the cover part 14.
  • the pump piston 16 with the pressure limiting device 72 is completely in the fluid chamber 24, which widens conically on the inlet side, and is thus brought into a neutral position there, in which a main fluid volume flow can flow unhindered from the inlet 30 towards the outlet 34, which is again shown with an arrow.
  • Both pump chambers 26 and 28 are equally flowed through, as well as the pump piston 16 with the associated pressure limiting device 72 on the outer circumference.
  • a pressure limiting device 72 is integrated in a pump piston 16 of a pump device, allows the described pressure limitation to be implemented in a simple, space-saving manner and additional, costly pressure limiting valves can be dispensed with. Furthermore, in an embodiment not shown, it is also possible to use the handle 38 and/or to move the actuating rod 36 back and forth by means of a motorized drive, so that manual pumping is not absolutely necessary.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP23190280.0A 2022-09-28 2023-08-08 Dispositif de pompage Pending EP4345306A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102022003590.1A DE102022003590A1 (de) 2022-09-28 2022-09-28 Pumpenvorrichtung

Publications (1)

Publication Number Publication Date
EP4345306A1 true EP4345306A1 (fr) 2024-04-03

Family

ID=87567098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23190280.0A Pending EP4345306A1 (fr) 2022-09-28 2023-08-08 Dispositif de pompage

Country Status (2)

Country Link
EP (1) EP4345306A1 (fr)
DE (1) DE102022003590A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166004B (de) * 1954-02-23 1964-03-19 Jean Mercier Doppelt wirkende Kolbenpumpe fuer Fluessigkeiten mit einer Verbindungsleitung zwischen den beiden Zylinderkammern
US6186118B1 (en) * 1999-11-10 2001-02-13 Delphi Technologies, Inc. Integrated fuel rail and direct injection fuel pump
WO2015071397A1 (fr) * 2013-11-15 2015-05-21 Nuovo Pignone Srl Ensemble piston-cylindre pour compresseur alternatif
EP3352877B1 (fr) * 2015-09-25 2020-07-15 Hydac Fluidcarecenter GmbH Dispositif filtrant avec pompe

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469712C (de) 1926-07-27 1928-12-19 Friedrich Dietz Doppelt wirkende Pumpe mit elektromagnetischem Antrieb zum Foerdern von Erdoel, Sole und anderen Fluessigkeiten aus Bohrloechern
DE2021687A1 (de) 1970-05-02 1971-12-02 Rubner Kg G E Doppeltwirkende Hydraulik-Handpumpe
US3787149A (en) 1971-03-24 1974-01-22 G Levey Pump for zinc-rich materials or the like
DE8713223U1 (de) 1987-10-01 1988-01-07 Dams, Jörn, 4320 Hattingen Bodenventil für mehrstufige hydraulische Zylindereinheiten
DE19948747C2 (de) 1999-10-09 2003-10-02 Bar Pneumatische Steuerungssys Einrichtung zur Sicherheitsrückstellung einer pneumatischen Betätigungsvorrichtung
DE102019129478A1 (de) 2019-10-31 2021-05-06 Linz Center Of Mechatronics Gmbh Hydraulischer schrittmotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166004B (de) * 1954-02-23 1964-03-19 Jean Mercier Doppelt wirkende Kolbenpumpe fuer Fluessigkeiten mit einer Verbindungsleitung zwischen den beiden Zylinderkammern
US6186118B1 (en) * 1999-11-10 2001-02-13 Delphi Technologies, Inc. Integrated fuel rail and direct injection fuel pump
WO2015071397A1 (fr) * 2013-11-15 2015-05-21 Nuovo Pignone Srl Ensemble piston-cylindre pour compresseur alternatif
EP3352877B1 (fr) * 2015-09-25 2020-07-15 Hydac Fluidcarecenter GmbH Dispositif filtrant avec pompe

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Publication number Publication date
DE102022003590A1 (de) 2024-03-28

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