WO2019166207A1 - Dispositif pour fournir des fluides sous une pression prédéterminée - Google Patents

Dispositif pour fournir des fluides sous une pression prédéterminée Download PDF

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Publication number
WO2019166207A1
WO2019166207A1 PCT/EP2019/053239 EP2019053239W WO2019166207A1 WO 2019166207 A1 WO2019166207 A1 WO 2019166207A1 EP 2019053239 W EP2019053239 W EP 2019053239W WO 2019166207 A1 WO2019166207 A1 WO 2019166207A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
pump
valve
switching position
pressure
Prior art date
Application number
PCT/EP2019/053239
Other languages
German (de)
English (en)
Inventor
Frank Herold
Christian Groh
Jerome KORN
Original Assignee
Hydac Electronic 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 Electronic Gmbh filed Critical Hydac Electronic Gmbh
Priority to EP19704786.3A priority Critical patent/EP3710697B1/fr
Publication of WO2019166207A1 publication Critical patent/WO2019166207A1/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
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • 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
    • F04B53/06—Venting
    • 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
    • F04B53/08—Cooling; Heating; Preventing freezing

Definitions

  • Means for providing below a predetermined pressure are the fluids
  • the invention relates to a device for providing under a predetermined pressure fluids for the pressure supply Ab Abdozens, such as a working unit of an SCR (Selective Catalytic reduction system for exhaust gas treatment of internal combustion engines, with at least one pump, which in between a fluid reservoir and the Customer formed fluid circuit takes the fluid in question from the fluid supply ent and supplies the customer.
  • a device for providing under a predetermined pressure fluids for the pressure supply Ab Abdozens such as a working unit of an SCR (Selective Catalytic reduction system for exhaust gas treatment of internal combustion engines, with at least one pump, which in between a fluid reservoir and the Customer formed fluid circuit takes the fluid in question from the fluid supply ent and supplies the customer.
  • SCR Selective Catalytic reduction system for exhaust gas treatment of internal combustion engines
  • Devices of this type are prior art, for example, the document DE 10 2012 01 6 631 A1 discloses a device of this type.
  • devices of this type When devices of this type are used for the supply of working units which supply a urea aqueous solution under a given supply pressure to the injection valve of an SCR system, the freezing of the fluid causes problems.
  • Water containing urea (Adblue) solution expands by 8% when frozen, so action must be taken to protect the device from damage or destruction caused by freezing.
  • Be known measures, such as the provision of elastic compensation volumes require a corresponding design effort and are therefore costly.
  • the invention has the object to provide a device of the type mentioned available that is simple and inexpensive to produce and safe to operate under freezing conditions.
  • a significant feature of the invention is that a Dros selstelle containing line branch and a valve assembly are provided in the fluid circuit, which is operable in a fluid supply to the pump switching position, in which formed a flow path is, which contains the throttle line having line branch, and in a second, the United supply of the consumer interrupting switching position is actuated, wherein a pump connecting to the environment flow path is formed.
  • the problem of freezing befindettess in the pump fluid is avoided in that when interrupting the supply of the customer, for example, in time coordination with the shutdown of the pump, this via a means of Ventilanord tion formed, leading to the environment flow completely or fully ventilated so that no or little freezable fluid in the pump is at standstill periods under freezing conditions. If the pump is put into operation after aeration, it is self-venting at the first switching position of the valve assembly via the branch containing the throttle point and operates during the supply of the customer as a pure liquid pump.
  • the line branch containing the throttle point can be arranged between the fluid reservoir and the pressure side of the pump.
  • the suction side is in the second switching position of the valve assembly via this with the environment in combination.
  • the non-return valve forming the throttle point may be part of a standing with the pressure side of the pump in United pressure relief valve.
  • the fluid circuit is characterized in an advantageous manner with a small number of functional components realized.
  • the arrangement can also be made so that is connected at the two th switching position of the valve assembly on this environment with the suction side of the pump.
  • the inflow side of the filter with the valve assembly and the environment via a return check valve may be connected, so that in the second switching position of the Fil ter is not included in the flow path through which the ventilation of the pump.
  • the arrangement may be such that the valve arrangement has, in addition to a first directional control valve connected to the pump, a second directional valve which is arranged between the discharge side of the filter connected to the consumer and the fluid supply and at the second switching position of the first directional control valve Switching position is actuated, in which the environment is connected via the filter and the second directional control valve to the suction side of the pump.
  • the valve assembly may advantageously 3/2-way valves and 4/2-way valves, each in the form of electromagnetically actuated slide valves have.
  • the respective, the throttle body containing check valve having a valve body with each other at right angles duri fenden fluid connections, in which a closing body is provided to one of the fluid connections coaxially displaceable, spring-loaded valve piston with a coaxial through-hole, from which a throttle bore branches off at right angles leading to the second fluid port.
  • FIG. 1 partially in schematically simplified sectional view and partly in symbol representation of an embodiment of he inventive device
  • Fig. 2 in symbolic representation, the hydraulic circuit of the fluid circuit of the embodiment, wherein the drive unit of the pump is omitted;
  • Fig. 3 is a view similar to Figure 2 depicting a modified embodiment.
  • Fig. 4 is a Figures 2 and 3 corresponding representation of a wide ren embodiment.
  • Fig. 5 shows a comparison with a practical embodiment greatly enlarged longitudinal section of a throttle body forming a check valve as part of the hydraulic circuit of the embodiments of the device according to the invention.
  • the device has a pressure-actuated pump 3, the circulation in a fluid 4, the aqueous urea solution from a fluid reservoir contained border tank 5 via a suction line 7 and returns via a scrublauflei device 9 to the tank 5 returns.
  • the fluid circuit 4 is located in the on the pressure side 1 1 of the pump 3 connected to the pressure line 1 3 one of the working unit 1 upstream fluid filter 1 5 to ensure the supply of the working unit 1 with clean contaminants.
  • the working unit 1 has in the usual manner in SCR systems to an electronic control device (not shown) in accordance with the respective loading operating state of an internal combustion engine supply pressure fluid in metered injection amounts of an injection device supplying the fluid in the exhaust gas flow initiates.
  • the suction line 7 is located in front of the suction side 21 of the pump 3, a valve assembly with a 3/2-way valve 23rd
  • the pump 3 is a positive displacement pump, wherein the displacer element is formed by a metal bellows 25 which is in the form of a bellows be, which includes a fluid space 29 within the pump housing 27 to.
  • the pressure line opens 1 3 on the pressure side 1 1 via a pressure valve 31 into the fluid chamber 29, while on the suction side 21, a mammoth valve 33 is located.
  • the pump 3 is druckmitteibetätigbar means of a drive unit 35, via the working spaces in a drive cylinder 37 with a pressure medium, such as pressure oil or air, can be supplied.
  • a pressure medium such as pressure oil or air
  • An in the working cylinder 37 befindl i cher piston 39 is connected via a piston rod 41 to the metal bellows 35 a related party, so that movements of the piston 39, the volume of the fluid chamber 29 change.
  • the use of a metal bellows 25 as a displacement is particularly advantageous for fluids such as aqueous urea solution, which are creep and aggressive, because without sealing problems a clean Tren tion of the fluid circuit 4 from the drive side pressure medium, such as
  • Pressure oil can be reached over long operating periods.
  • the piston 39 is biased by means of a compression spring 43 for a displacement movement which reduces the volume of the fluid space 29.
  • the drive unit 35 has a switching valve in the form of a 3/2-way valve 45, via which the spring 43 opposite the working chamber 47 in drive cylinder 34 to alternately with pressure medium, which is supplied from a Druckan circuit P, supplied or with a return line or Tanklei 49 is connected, in which a through a check valve 51 till- secured return filter 53 is located. Between the pressure port P and the tank line 49 is a desired drive pressure before issuing pressure control valve 55.
  • an operating state is shown, in which the directional control valve 23 in a pressure supply to the working unit 1 interrupting switching position, referred to here as the second switching position, is located. If in this case the pump 3, before it is switched off for the termination of the operation, still continues to suck it via the directional control valve 23 from the environment 57 air, while remaining urea solution from the fluid idraum 29 pushed out and over the filter 1 5 and the Throttle 18 in the check valve 1 9 of the pressure relief valve 1 7 to give to the tank 5, so that the pump 3 is vented after stopping and contains little or no freezable fluid.
  • the pump 3 Upon resumption of operation and switching the directional control valve 23 in the other, first switching position, the pump 3 vented automatically by suction of the fluid through the Sauglei device 7 and expelling the air in the space 29 containing air via line 1 3 and the throttle body 18 in the Return line 9. In the normal operation, the pump 3 thus operates as a liquid pump.
  • Fig. 3 shows a variant of the fluid circuit 4, wherein the Ventilanord voltage has a 4/2-way valve 59, wherein this is in the operation of the Nor Nor corresponding first switching position.
  • the directional control valve 59 connects the suction side 21 of the pump 3 via a check valve 62 with the surrounding 57, while the suction side 21 of the pump 3 verbun via the versor in the supply operation, the suction line forming line 7 to the tank 5 is the.
  • the pump 3 In the second switching position of the directional control valve 59, the pump 3 therefore vented via the check valve 62 from the environment 57 ago, while remaining fluid is pushed out of the pump 3 via the line 7 out.
  • the pump 3 When switching the directional control valve 59 in the first switching Stel ment, the pump 3 vented again automatically via the suction line 7 and the throttle point 18 of the check valve 1 9, which is part of the located in the return line 9 pressure relief valve 1 7.
  • valve assembly except the directly connected to the pump 3 3/2-way valve 61, a second way valve in the form of a 4/2-way valve 63, which at the return line 9 forming the line branch, the the throttle body 18 having return check valve contains 1 9, and is connected to the suction line 7.
  • a second way valve in the form of a 4/2-way valve 63 which at the return line 9 forming the line branch, the the throttle body 18 having return check valve contains 1 9, and is connected to the suction line 7.
  • the operation corresponds to the normaléessbe.
  • return check valve 62 is connected to the inflow side of the filter 1 5, whose outflow side is in communication with the working unit 1.
  • the directional control valve 61 When switching the valve assembly to the second switching position of the directional control valves 61, 63 for the ventilation of the pump 3, the directional control valve 61 connects the pressure side 1 1 of the pump 3 with the serving as a suction line during normal operation line 7. At the same time, the second directional valve 63 connects the Abströmsei te of Filter 1 5 with the suction side 21 of the pump 3. With the pump 3, this therefore vented from the environment 57 forth on the check valve 62 and the filter 1 5 to the suction side 21, while remaining fluid is discharged to the tank 5.
  • the pump 3 When switching to the first Druckstellun conditions of the directional control valves 61, 63, as shown in Fig. 4, the pump 3 vented through the suction line 7, wherein the air via the throttle point 18th is ejected, so that the pump 3 again works as a pure liquid pump.
  • valve housing 57 As can be seen, are located on the valve housing 57, an inflow-side fluid port 69 and a downstream fluid port 71, which branches off at right angles from the fluid port 69.
  • a valve piston 73 is mounted in the valve housing 67 coaxial with the inflow-side fluid port 69 and biased by a Sch workedfe of 75 in the closed position.
  • the valve piston 73 has a through-bore 77, from which a throttle bore 79 forming the throttle point 18 branches off at right angles, which leads to the downstream fluid connection 71.
  • the check valve 1 9 is adjustable as a pressure relief valve to a predetermined pressure, while at the same time by dimensioning the Drosselboh tion 79, the throttle body 18 is formed with the desired throttle effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne un dispositif pour fournir des fluides sous une pression prédéterminée afin de fournir une pression à un consommateur, tel qu'une unité de travail (1) d'un système SCR (réduction catalytique sélective) pour traiter les gaz d'échappement de moteurs à combustion interne, comportant au moins une pompe (3) qui, dans un circuit de fluide (4) formé entre un réservoir de fluide (5) et le consommateur (1), retire le fluide concerné du réservoir de fluide (5) et le fournit au consommateur (1), caractérisé en ce que le circuit de fluide (4) présente une branche de ligne (9) contenant un point d'étranglement (18) et un dispositif de soupape (23, 59, 61, 63) qui peut être actionnée dans une position de commutation qui relie le réservoir de fluide (5) à la pompe (3) et dans laquelle est formé un trajet de circulation, qui contient la branche de ligne (9) ayant le point d'étranglement (18) et qui peut être actionnée dans une deuxième position de commutation interrompant l'alimentation du consommateur, dans laquelle un trajet d'écoulement reliant la pompe (3) à l'environnement (57) est formé.
PCT/EP2019/053239 2018-02-27 2019-02-11 Dispositif pour fournir des fluides sous une pression prédéterminée WO2019166207A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19704786.3A EP3710697B1 (fr) 2018-02-27 2019-02-11 Dispositif pour fournir des fluides sous une pression prédéterminée

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018001523.9 2018-02-27
DE102018001523.9A DE102018001523A1 (de) 2018-02-27 2018-02-27 Einrichtung zur Bereitstellung von unter einem vorgebbaren Druck stehenden Fluiden

Publications (1)

Publication Number Publication Date
WO2019166207A1 true WO2019166207A1 (fr) 2019-09-06

Family

ID=65409078

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/053239 WO2019166207A1 (fr) 2018-02-27 2019-02-11 Dispositif pour fournir des fluides sous une pression prédéterminée

Country Status (3)

Country Link
EP (1) EP3710697B1 (fr)
DE (1) DE102018001523A1 (fr)
WO (1) WO2019166207A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021000327A1 (de) 2021-01-22 2022-07-28 Hydac Fluidtechnik Gmbh Pumpenvorrichtung
DE102021002116A1 (de) 2021-04-22 2022-10-27 Hydac Fluidtechnik Gmbh Pumpenvorrichtung
DE102021003639A1 (de) * 2021-07-14 2023-01-19 Hydac Technology Gmbh Fördereinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011088217A1 (de) * 2011-12-12 2013-06-13 Robert Bosch Gmbh Dosieranordnung für ein flüssiges Abgasnachbehandlungsmittel und Dosierverfahren
DE102012205370A1 (de) * 2012-04-02 2013-10-02 Robert Bosch Gmbh 3/2-Wegeventil
DE102012011975A1 (de) * 2012-06-15 2013-12-19 Rolf Prettl Ventilanordnung und Ventilansteuerverfahren
DE102012016631A1 (de) 2012-08-22 2014-02-27 Hydac Electronic Gmbh Einrichtung zur Bereitstellung von unter einem vorgebbaren Druck stehenden Fluiden

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016216366A1 (de) * 2016-08-31 2018-03-01 Robert Bosch Gmbh Dosiersystem für eine Abgasnachbehandlung einer Brennkraftmaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011088217A1 (de) * 2011-12-12 2013-06-13 Robert Bosch Gmbh Dosieranordnung für ein flüssiges Abgasnachbehandlungsmittel und Dosierverfahren
DE102012205370A1 (de) * 2012-04-02 2013-10-02 Robert Bosch Gmbh 3/2-Wegeventil
DE102012011975A1 (de) * 2012-06-15 2013-12-19 Rolf Prettl Ventilanordnung und Ventilansteuerverfahren
DE102012016631A1 (de) 2012-08-22 2014-02-27 Hydac Electronic Gmbh Einrichtung zur Bereitstellung von unter einem vorgebbaren Druck stehenden Fluiden

Also Published As

Publication number Publication date
EP3710697A1 (fr) 2020-09-23
DE102018001523A1 (de) 2019-08-29
EP3710697B1 (fr) 2021-10-06

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