EP2459885A1 - Amplificateur de pression et soupape de commande associée - Google Patents

Amplificateur de pression et soupape de commande associée

Info

Publication number
EP2459885A1
EP2459885A1 EP10736979A EP10736979A EP2459885A1 EP 2459885 A1 EP2459885 A1 EP 2459885A1 EP 10736979 A EP10736979 A EP 10736979A EP 10736979 A EP10736979 A EP 10736979A EP 2459885 A1 EP2459885 A1 EP 2459885A1
Authority
EP
European Patent Office
Prior art keywords
pressure
control valve
control
druckverstarker
input
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Withdrawn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
EP10736979A
Other languages
German (de)
English (en)
Inventor
Peter Diehl
Jens Schleicher
Daniele Leuci
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.)
Aerzener Maschinenfabrik GmbH
Ludwig Ehrhardt GmbH
Original Assignee
Aerzener Maschinenfabrik GmbH
Ludwig Ehrhardt 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 Aerzener Maschinenfabrik GmbH, Ludwig Ehrhardt GmbH filed Critical Aerzener Maschinenfabrik GmbH
Publication of EP2459885A1 publication Critical patent/EP2459885A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

Definitions

  • the invention relates to a hydraulic pressure booster and a corresponding control valve for controlling the inlet to the pressure booster.
  • Figure 1 shows a conventional hydraulic pressure booster 1, which is also referred to as Hydrodruckübersetzer and is sold, for example, by the applicant.
  • the pressure booster 1 has on its primary side to a pressure input IN, via which the pressure booster 1 can be connected to a pressure source, which provides a fluid pressure p IN , wherein the pressure source is not shown for simplicity.
  • the pressure booster 1 On its secondary side, however, the pressure booster 1 has a pressure outlet H, via which the pressure booster 1 can be connected to a hydraulic consumer 2, the consumer 2 being shown only schematically.
  • the pressure booster 1 translates the applied primary side fluid pressure p IN with a transmission ratio of 1.5-7.5 in a larger secondary-side fluid pressure P H , with the consumer 2 is acted upon.
  • the pressure booster 1 still has a return connection R on the primary side, via which leakage can be recirculated, which occurs due to the design between the pressure input IN and the return connection R.
  • two check valves RV1, RV2 and a pilot-operated check valve DV are located in the pressure booster 1.
  • the structure and operation of the mechanical pressure booster 3 are, for example, in DE 102 49 523 Al, so that the content of this document is fully attributable to the present description.
  • hydraulic oil with the p ⁇ mar thesisen fluid pressure p IN first passes through the pressure input IN via the check valves RV 1, RV 2 to the secondary-side pressure output H.
  • the pressure booster 1 is in this phase in the so-called rapid traverse function.
  • the mechanical pressure booster 3 also increasingly works with the predetermined transmission ratio, so that the secondary-side fluid pressure p H rises to the predetermined value.
  • the Druckverstarker 1 vorzusalten a 4/3-way valve 5, as m m Figure 2 is shown.
  • the 4/3-way valve relieves the fluid pressure pi N at the primary-side pressure input IN of the Druckverstarkers 1 as soon as the secondary-side fluid pressure p H is established.
  • the primary side Toggle parent 4/3-way valve 5 prevents Although the interfering leakage from the primary side pressure input IN to the primary side jerk vehicle terminal R, however, it is not possible in this way to obtain the secondary side fluid pressure p H aufrechtzu ⁇ .
  • DE 199 26 566 A1 discloses a hydraulic drive with an integrated pressure booster and a feedback loop from the secondary side of the pressure booster to the primary side of the pressure booster.
  • the feedback loop here does not serve to avoid the disturbing leakage losses, but merely aims at setting the desired pressure as accurately as possible on the secondary side of the pressure intensifier.
  • this document discloses the Druckverstarker with the feedback loop only as part of a hydraulic drive, but not as a single component.
  • the invention is therefore based on the object to avoid in such a hydraulic pressure booster, the leakage-related malfunctions and still allow a secondary-side pressure maintenance.
  • the invention comprises the general technical teaching to provide a feedback from the secondary side of the Druckverstarkers on the primary side of the Druckverstarkers to control the pri mary control valve.
  • an operating variable is tapped on the secondary side and fed back as a controlled variable to the primary side of the pressure intensifier.
  • the controlled variable to the secondary side fluid pressure should be kept constant within the gewünsch ⁇ th printing posture.
  • the invention is not limited to secondary fluid pressure, but can basically also be implemented with other secondary operating variables of the pressure intensifier or of the hydraulic consumer driven by the pressure intensifier.
  • the feedback loop from the secondary side of the Druckverstarkers on the primary side of the Druckverstarkers comprises a pressure line which leads from the pressure output on the secondary side of the Druckverstarkers on the primary side of the Druckverstarkers and the secondary side fluid pressure as Regeldorf returned to the primary side of the Druckverstarkers.
  • the secondary-side fluid pressure is directly fed back via the pressure line without a measured value conversion as a controlled variable.
  • the large side tapped off on the secondary side is first converted into an electrical, optical or other variable and then fed back.
  • the feedback loop can therefore also include a transducer.
  • the control valve arranged on the primary side then assumes either a closed valve position or an open valve position as a function of the feedback-coupled operating variable.
  • the control valve thus preferably allows only two different valve positions, namely either one closed valve position or an open valve position. In principle, however, there is also the possibility that the control valve continuously changes its valve position between a closed valve position and an opened valve position within the scope of the feedback.
  • the primary side arranged control valve has two control inputs, namely, on the one lung loop a control input for the Ruckkopp- and on the other a control input for Recordin ⁇ me a target value for the secondary side fluid pressure.
  • the control valve then opens or closes in dependence on the secondary pressure measured and feedback fluid pressure relative to the predetermined desired value of the fluid pressure. If the fluid pressure measured on the secondary side falls below the predetermined nominal value, the control valve opens in order to again supply working fluid (eg hydraulic oil) to the pressure intensifier and thereby raise the secondary fluid pressure again.
  • working fluid eg hydraulic oil
  • the second control input for setting the set value for the secondary-side fluid pressure may be, for example, a mechanical control input. This means that the target value for the secondary-side fluid pressure can be adjusted manually, for example, by a set screw.
  • the second control input is set the nominal value.
  • Values is a pneumatic control input, which receives a corresponding pneumatic control signal.
  • the pressure booster according to the invention thus combines the technical functions of a pressure booster and a pressure regulator, since the pressure booster according to the invention has an integrated pressure regulator in the preferred exemplary embodiment.
  • control valve disposed on the primary side preferably has a switching hysteresis in order to prevent the control valve from fluttering when the second fluid pressure measured in the second instance substantially corresponds to the desired desired value.
  • the control valve thus opens when the fluid pressure measured on the secondary side falls below a certain opening pressure, whereas the control valve closes when the secondary pressure measured fluid pressure exceeds a certain closing pressure, the closing pressure by a certain pressure difference is greater than the opening pressure to the desired To achieve switching hysteresis.
  • the pressure difference between the closing pressure and the opening pressure of the primary-side control valve can be between 2% and 15% of the closing pressure or the opening pressure.
  • the pressure difference between the closing pressure and the opening pressure is sufficiently large in order to avoid the unwanted fluttering of the control valve.
  • the Druckverstarker also has a scrubenburg port to a leakage of the working fluid (eg hydraulic oil) due.
  • the pressure intensifier according to the invention can thus also have a leakage from the primary-side pressure input to the return port.
  • this design-related leakage in the pressure intensifier according to the invention does not lead to malfunctions, since this leakage occurs only when the primary-side pressure input is acted upon by the working fluid. However, this is only the case when the secondary-side fluid pressure has fallen below the desired set point.
  • the pressure intensifier has a pressure transfer ratio, which may be in the range of 1.5-20, for example.
  • the invention is not limited to this range of values with regard to the pressure transmission ratio of the pressure intensifier, but in principle can also be implemented with other pressure transmission ratios.
  • the secondary-side fluid pressure is greater in operation than the primary-side fluid pressure.
  • the pressure amplifier according to the invention is preferably a hydraulic pressure booster.
  • the invention is not limited to Druckverstarker that use hydraulic fluid as the working fluid. Rather, it is also possible in principle that the pressure intensifier according to the invention uses other working fluids and is designed accordingly.
  • the actual mechanical pressure booster with the low-pressure piston and the high-pressure piston is preferably arranged in a housing plate having a plurality of holes to form the terminals of the Druckverstarkers.
  • the According to the invention Druckverstarker preferably a flange plate which is flanged to the Gehauseplatte and in which the control valve is arranged.
  • the feedback loop it is possible within the scope of the invention for the feedback loop to extend beyond the housing plate of the pressure intensifier and into the flange plate with the control valve.
  • control valve is structurally separated from the actual Druckverstarker.
  • control valve is connected by a piping to the Druckverstarker.
  • FIG. 1 shows a conventional hydraulic pressure intensifier, which due to its construction has a leakage
  • FIG. 2 shows the conventional pressure intensifier according to FIG. 1 with a primary-side 4/3-way valve for avoiding leakage-related malfunctions
  • FIG. 3 shows an inventive Druckverstarker with an input-side control valve and a feedback loop from the secondary side of Pressure intensifier on the primary side of the pressure intensifier
  • FIG. 4 shows a modification of the pressure intensifier according to the invention with a mechanically adjustable nominal value for the secondary fluid pressure
  • FIG. 5 shows a further modification of the invention
  • FIG. 6 shows a hysteresis characteristic of the invention
  • FIG. 7 shows an equivalent circuit diagram of the pressure intensifier according to the invention with the control valve on the input side as well as
  • FIG. 8 shows a simplified cross-sectional view of the pressure intensifier according to the invention, wherein the control valve is arranged in a flange plate.
  • the erfmdungsgedorfe Druckverstarker 1 shown in Figure 3 largely agrees with the above-described conventional Druckverstarker 1 uberem, so reference is made to avoid repetition of the above description, the same reference numerals are used for corresponding details.
  • a special feature of the pressure booster 1 according to the invention consists in the primary-side control valve 6, which controls the fluid flow through the pressure input IN, wherein the control valve 6 occupies either an open valve position or a closed valve position.
  • the control valve 6 is controlled by a feedback loop 7, which starts from the secondary side of the pressure booster 1 and the secondary-side fluid pressure p H as a controlled variable réellekoppel.
  • the primary-side control valve 6 opens the inflow through the pressure input IN, when the secondary-side fluid pressure p H falls below a predetermined setpoint, wherein the setpoint is determined by the switching characteristic of the control valve 6.
  • the hydraulic fluid introduced via the pressure input IN then leads to an increase in the secondary-side fluid pressure p H , whereupon the control valve 6 then closes again in order to minimize the leakage from the pressure input IN to the return port R.
  • the control valve 6 thus has two functions. On the one hand, the control valve to maintain the secondary side fluid pressure p H on ⁇ quite 6 by the control valve 6 opens when the se- kundar preparede fluid pressure falls off p H. On the other hand that should
  • Control valve 6 but also minimize the leakage from the pressure input H to the return port R by the control valve 6 closes when the secondary-side fluid pressure p H at the pressure output to the desired target value or even exceeds.
  • the closing of the control valve 6 leads to a pressure relief at the pressure input IN of the pressure booster 1, whereby the leakage is reduced.
  • FIG. 4 shows a modification of the pressure intensifier 1 according to the invention according to FIG. 3, so that reference is made to the above description to avoid repetition, the same reference numbers being used for corresponding details.
  • a special feature of the pressure intensifier 1 is that the control valve 6 has a mechanical control input in the form of an adjusting screw, wherein a desired setpoint P SOLL for the Sekundärarseiti- fluid pressure P H can be adjusted via the set screw.
  • the adjusting screw in this case allows a change in the switching characteristic of the control valve. 6
  • FIG. 6 shows a hysteresis characteristic of the control valve 6 from FIGS. 3-5. It can be seen that the control valve 6 closes when the secondary side fluid pressure P H to exceed a predetermined closing pressure p. On the other hand, the control valve 6 opens again when the secondary-side fluid pressure PH falls below a predetermined opening pressure p A uF.
  • the closing pressure p to is in this case by a predetermined pressure difference .DELTA.p greater than the opening pressure p AUF »to achieve the desired switching hysteresis of the control valve 6.
  • the pressure difference .DELTA.p can be, for example, 10% of the predetermined
  • the Heidelbergcharakte ⁇ stik of the control valve 6 can be adjusted in this case such that the target value P SOLL in the To lies midway between the opening pressure p ON and the closing pressure p.
  • FIG. 7 shows an equivalent circuit diagram of the pressure intensifier 1 according to FIGS. 3-5 with a subtracter 8 and a controller 9, wherein the subtracter 8 and the controller 9 are structurally integrated into the control valve 6 in practice.
  • FIG. 8 shows a simplified cross-sectional view of a pressure booster 1 according to the invention, which is arranged here without the control valve 6 in a housing plate 10, whereby a plurality of bores 11-15 run through the housing plate 10.
  • control valve 6 is arranged in a separate flange plate 16, which likewise has a plurality of bores which correspond to the bores 11-15 in the housing plate 10.
  • end plates 17, 18 are provided, wherein the end plate 17 connects the bore 11 in the housing plate 10 with the bore 14 in the housing plate 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

L'invention concerne un amplificateur de pression (1) comprenant une entrée de pression (IN) sur le côté primaire de l'amplificateur de pression (1) pour recevoir une pression de fluide du côté primaire (pIN), une sortie de pression (H) sur un côté secondaire de l'amplificateur de pression (1) pour fournir une pression de fluide du côté secondaire (pH), et une soupape de commande (6) qui commande le flux de pression qui s'écoule du côté primaire par l'entrée de pression (IN) vers l'amplificateur de pression (1). Selon l'invention, l'amplificateur de pression (1) comprend une boucle de rétroaction (7) allant du côté secondaire de l'amplificateur de pression (1) vers le côté primaire de l'amplificateur de pression (1) pour commander la soupape de commande (6).
EP10736979A 2009-07-30 2010-07-02 Amplificateur de pression et soupape de commande associée Withdrawn EP2459885A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009035278A DE102009035278B4 (de) 2009-07-30 2009-07-30 Druckverstärker
PCT/EP2010/003999 WO2011012193A1 (fr) 2009-07-30 2010-07-02 Amplificateur de pression et soupape de commande associée

Publications (1)

Publication Number Publication Date
EP2459885A1 true EP2459885A1 (fr) 2012-06-06

Family

ID=42732073

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10736979A Withdrawn EP2459885A1 (fr) 2009-07-30 2010-07-02 Amplificateur de pression et soupape de commande associée

Country Status (3)

Country Link
EP (1) EP2459885A1 (fr)
DE (1) DE102009035278B4 (fr)
WO (1) WO2011012193A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118225A1 (de) * 2011-11-12 2013-05-16 Knocks Fluid-Technik GmbH Präzisionsvolumenstrombooster
EP3904699B1 (fr) * 2013-03-25 2022-12-14 miniBOOSTER HYDRAULICS A/S Système hydraulique
DE102014211258A1 (de) * 2014-06-12 2015-12-17 Materialforschungs- und -prüfanstalt an der Bauhaus-Universität Weimar Vorrichtung zur Erzeugung definierter Druckverläufe
EP3002465B1 (fr) 2014-09-30 2019-10-23 Danfoss Power Solutions Aps Système hydraulique
DK3859166T3 (da) * 2020-01-31 2022-03-21 Minibooster Hydraulics As Hydraulisk trykforstærkningsanordning

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2648145A1 (de) * 1976-10-23 1978-04-27 Frieseke & Hoepfner Gmbh Zuschaltventil
DE3228494A1 (de) * 1982-07-30 1984-02-02 Konrad 6720 Speyer Ziesling Druckverstaerker zur verstaerkung des druckes eines mediums auf einen hoeheren druck
US4940290A (en) * 1987-08-13 1990-07-10 Aisin Seiki Kabushiki Kaisha Hydraulic braking system
RU1837124C (ru) * 1989-07-14 1993-08-30 Новосибирское авиационное производственное объединение Пневмогидравлический двухступенчатый усилитель давлени дл гидрозажимов станочных приспособлений
DE19926566A1 (de) * 1999-06-11 2000-12-14 Boy Gmbh Dr Hydraulischer Antrieb
JP4588161B2 (ja) * 2000-04-11 2010-11-24 株式会社コスメック 増圧ポンプ
DE10249523C5 (de) * 2002-10-23 2015-12-24 Minibooster Hydraulics A/S Druckverstärker
DE102006026337A1 (de) * 2006-06-02 2007-12-06 Minibooster Hydraulics A/S Hydraulischer Druckverstärker
DE102007017665A1 (de) * 2007-04-14 2008-10-16 Uwe Hammer Hydraulischer Druckverstärker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011012193A1 *

Also Published As

Publication number Publication date
WO2011012193A1 (fr) 2011-02-03
DE102009035278B4 (de) 2013-11-28
DE102009035278A1 (de) 2011-02-03

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