EP3008341A1 - Pompe de refoulement de liquide - Google Patents

Pompe de refoulement de liquide

Info

Publication number
EP3008341A1
EP3008341A1 EP14724489.1A EP14724489A EP3008341A1 EP 3008341 A1 EP3008341 A1 EP 3008341A1 EP 14724489 A EP14724489 A EP 14724489A EP 3008341 A1 EP3008341 A1 EP 3008341A1
Authority
EP
European Patent Office
Prior art keywords
pump
eccentric
deformable element
pump housing
inlet
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Withdrawn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
EP14724489.1A
Other languages
German (de)
English (en)
Inventor
Jan Hodgson
Rolf BRÜCK
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 EP3008341A1 publication Critical patent/EP3008341A1/fr
Withdrawn legal-status Critical Current

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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/123—Machines, pumps, or pumping installations having flexible working members having peristaltic action using an excenter as the squeezing element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • 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
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • 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
    • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
    • F04B43/14—Machines, pumps, or pumping installations having flexible working members having peristaltic action having plate-like flexible members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0007—Radial sealings for working fluid
    • F04C15/0015—Radial sealings for working fluid of resilient material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0065—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a pump for conveying a liquid which is particularly suitable for conveying a liquid additive into the exhaust gas line device of an internal combustion engine.
  • exhaust gas treatment devices For cleaning the exhaust gases of internal combustion engines, exhaust gas treatment devices are known in which a liquid additive is added to clean the exhaust gases.
  • An exhaust gas purification process performed in such exhaust gas treatment devices is the Selective Catalytic Reduction (SCR) process in which nitrogen oxide compounds in the exhaust gas are reduced with the aid of a reducing agent.
  • SCR Selective Catalytic Reduction
  • ammonia is used as the reducing agent.
  • Ammonia is often not stored directly in the motor vehicle, but in the form of a liquid additive, which is a precursor solution of the reducing agent.
  • This liquid additive can be converted into reducing agent in the exhaust gas (in the exhaust gas treatment device) or exhaust gases in a dedicated reactor to reducing agent.
  • urea-water solution is used for the SCR process.
  • AdBlue® AdBlue®.
  • At least one pump For conveying liquid additive from a tank and for the metered provision of the liquid additive to the exhaust pipe device, at least one pump is provided.
  • a pump should be as inexpensive and reliable as possible. It is particularly advantageous if the pump can also take over a metering function, that is, very precisely conveys a predetermined amount of the liquid additive.
  • Another important aspect of pumps for conveying liquid additives is that the liquid additives used for exhaust gas purification can freeze at low temperatures.
  • urea-water solution freezes, for example, at -11 ° C.
  • Such low temperatures can be in the automotive field z. B. occur during long downtime in winter, with the liquid additive expands during freezing.
  • the pump should therefore also be designed so that it is not damaged by freezing liquid additive.
  • the invention relates to a pump for conveying a liquid, comprising a pump housing with at least one inlet and at least one outlet s. On the pump housing, an eccentric is arranged, which is rotatable with an axis relative to the pump housing.
  • a deformable element is arranged between the pump housing and the eccentric, with at least one conveying path being limited from the at least one inlet to the at least one outlet and at least one displaceable seal of the conveying path being formed in the conveying path. disconnects closed pump volume.
  • the at least one displaceable seal is displaceable by moving the eccentric for conveying the liquid along the conveying path in a conveying direction from the inlet to the outlet.
  • the pump has at least one adjustable axial calibration device, by which the deformable element is braced in the axial direction parallel to the axis.
  • a pump with the construction described can be referred to as orbital pump.
  • the conveying path is arranged within the gap and the conveying path is limited at least by the (individual) deformable element and optionally additionally by the pump housing and / or the eccentric.
  • the deformable element is preferably arranged in the gap between the eccentric and the pump housing in such a way that it is squeezed or compressed in the region of the at least one seal between the housing and the eccentric so that the gap in the region of the seal is completely away from the deformable element is closed and / or the gap there no cross-sectional area more, which forms a (freely flowable) conveying path.
  • the gap or the conveying path is thereby sealed fluid-tight in the region of the at least one seal.
  • the gap or the delivery path is filled with the liquid during operation of the pump.
  • the at least one seal divides the conveying path, so that at least one closed pump volume is formed.
  • closed pump volume is meant in particular a volume within the conveying path, which is closed along the conveying path at least on one side by a seal.
  • a plurality of closed pump volumes are shifted from the inlet to the outlet to deliver the liquid.
  • a closed pump volume is formed in the vicinity of the inlet (defined closed) and then dissolved at the outlet (reopened).
  • At the inlet is a closed pump volume (only) on one side (downstream) closed by a seal and upstream connected to the inlet, so that the liquid can flow through the inlet in the closed pump volume.
  • the closed pump volume is (only) closed on one side (but upstream) by a seal and connected downstream with the outlet, so that the liquid can flow out through the outlet from the closed pump volume.
  • a phase in which the closed pump volume is closed on both sides by a seal In between there exists (on the way from the inlet to the outlet) a phase in which the closed pump volume is closed on both sides by a seal.
  • the pump housing of the pump is preferably a ring or a cylindrical chamber in which the eccentric is arranged inside (centric).
  • the pump housing may also be considered as the (outer) stator of the pump, while the eccentric may be referred to as the (inner) rotor.
  • the pump housing forms an inner stator, which is surrounded by the eccentric.
  • the eccentric forms an outer rotor.
  • the inlet and the outlet are arranged on the pump housing and allow the inflow and outflow of the liquid in the pump housing or in the conveying path.
  • the deformable element is a hose which is inserted in an arcuate gap between the eccentric and the pump housing and connects the inlet to the outlet.
  • the (one-piece and / or inside the pump housing inside and / or fixed) hose is preferably fluid-tightly connected to the inlet and to the outlet, so that the liquid enter through the inlet or through the outlet in the conveying path in the hose or can escape.
  • the seal is formed by the fact that the hose is compressed there by the eccentric and the pump housing.
  • the pump is also advantageous when the deformable member is a deformable membrane and the delivery path from the at least one inlet to the at least one outlet from the pump housing and the deformable membrane is at least partially limited.
  • the conveying path between the (integral and / or inside the pump housing and / or fixed) deformable diaphragm and the pump housing is formed and constitutes a gap between the pump housing and the deformable membrane.
  • the deformable membrane of the Eccentric pressed against the pump housing, so that the deformable diaphragm rests against the pump housing and between the deformable diaphragm and the pump housing remains no gap.
  • the deformable membrane is preferably shaped in sections in a U-shape around the pump housing and adhesively bonded and / or pressed to the pump housing.
  • the deformable element preferably consists of a flexible rubber material, which has a high deformability.
  • deformable elements of elastomeric materials, such as rubber or latex.
  • the material of the deformable element may contain additives.
  • the deformable element is flexible in all directions (axial, radial and circumferential).
  • the deformable element has a partially directed flexibility. For example, it may have a higher flexibility in the radial direction than in the circumferential direction and in the axial direction. Deformation of the deformable element in one direction typically also causes deformation in other spatial directions.
  • the deformable element expands, for example, in the axial direction and / or in the circumferential direction when it is compressed in the radial direction.
  • At least one stationary seal is also provided on the pump, which prevents unwanted backflow of the liquid from the outlet to the inlet.
  • the stationary seal prevents a direct bypass of the delivery path between the outlet and the inlet occurs. By bypass it is meant here that the liquid does not pass the entire length of the conveying path but takes a direct shorter path from the outlet back to the inlet.
  • the deformable element is a deformable membrane
  • this is preferably annular and inserted into a gap between the eccentric and the housing.
  • the conveying path forms a circular arc segment, and extends in sections (in the conveying direction from the inlet to the outlet) along the annular membrane.
  • the stationary seal is disposed along the annular diaphragm outside the circular arc segment of the delivery path between the inlet and the outlet. The stationary seal between the inlet and the outlet reliably prevents backflow.
  • the stationary seal may for example be formed by a dent or a pin of the pump housing, so that a gap between the pump housing and the eccentric is so far reduced that the membrane is always squeezed regardless of the position of the eccentric in the stationary seal, so that no bypass to the conveying path is formed or no backflow is possible.
  • the stationary seal can also be formed by a sectionwise (in the region of the stationary seal) thickening of the deformable membrane. By such a thickening of the membrane can also be ensured that a gap between the eccentric and the pump housing in the region of the stationary seal is always closed.
  • the stationary sealing can in principle also be achieved by virtue of the fact that the deformable membrane in the area of the stationary seal on the pump housing housing fluid-tight fastened (for example, screwed and / or glued) is. By such measures, a backflow between the deformable membrane and the pump housing is also effectively prevented.
  • the deformable element is a hose, no special measures are required to form a stationary seal because a (fluid-tight) hose connected to the inlet and to the outlet can not bypass. The stationary seal is then implicitly formed by the wall of the hose.
  • the eccentric is preferably designed in several parts.
  • the eccentric preferably has an inner region which performs an eccentric rotational movement.
  • an outer bearing ring may be provided, which surrounds the inner region.
  • This bearing can be a ball bearing or a roller bearing.
  • the inner region of the eccentric executes a rotary movement about the axis during operation. Due to the eccentric arrangement and possibly also due to the outer shape of the eccentric results in an eccentric movement of a surface of the eccentric. This eccentric movement is transmitted to the outer bearing ring.
  • an eccentric rotation of the inner portion can be converted into an eccentric wobble of the bearing ring, without the Drehtownsanteil is transmitted.
  • the fact that the movement of the bearing ring has no rotational movement component makes it possible to reduce shear stresses in the deformable element and internal friction forces of the pump.
  • the deformable element is then driven by the eccentric.
  • At a contact surface of the eccentric and the deformable element preferably only compressive forces and substantially no frictional forces act.
  • a corresponding division of the eccentric into an inner area and a bearing ring is also possible if the eccentric is an outer rotor which is arranged around an (inner) housing. It is also possible, that is dispensed with the outer bearing ring and roll the rollers of the bearing directly on or on the deformable element.
  • the pump has at least one drive for moving the eccentric.
  • the drive is preferably an electric motor, which is connected to a (shaft extending along the axis) to the eccentric.
  • the pump is preferably also suitable for being operated in the opposite direction to the conveying direction.
  • the eccentric is rotated counter to the conveying direction.
  • the adjustable axial calibration device makes it possible to influence the shape of the deformable element and in particular to change. By a deformation of the deformable element in the axial direction with the axial calibration device also occurs a deformation in the radial direction. In particular, the deformable element is also braced radially by an axial tension.
  • adjustable axial calibration device it is possible to selectively influence and in particular modify the rigidity or the deformability of the deformable element.
  • the axial calibration device it is possible with the axial calibration device to adapt the cross section of the conveying path between the inlet and the outlet. This effect can be used to compensate for dimensional inaccuracies and tolerances of the deformable element, the eccentric, and the pump housing using an adjustable axial calibration means.
  • the pump when the deformable element rests in the axial direction on both sides of contact surfaces, wherein a distance of the contact surfaces can be selectively adjusted with the axial calibration device.
  • the calibration device makes it possible to adjust the amount of liquid delivered by such a pump during one revolution of the eccentric particularly precisely. For example, it is possible to improve a tolerance in the flow rate as a function of the rotation of the eccentric to less than 5% deviation from a desired flow rate.
  • the pump is advantageous if the axial calibration device comprises a central Kalibri mecanicsverschraubung with which the deformable element is braced in the axial direction.
  • the central Kalibri mecanicsverschraubung is preferably adapted to exert a force on a arranged on / in the pump housing component to move the component.
  • a voltage anchor may be arranged on the pump housing, to which the central calibration gland attaches.
  • the voltage anchor can be designed as a central axis of the pump, which is at least partially provided with a thread with which the Kalibri mecanicsverschraubung is formed.
  • the calibration fitting may include a screw and / or a nut. An internal thread or an external thread can be provided on the pump housing in order to screw the pump housing to the calibration screw connection.
  • the Kalibri mecanicsverschraubung is preferably designed self-locking, so that they can not be solved during operation of the pump.
  • the calibration screw has a fine thread.
  • a backup of the Kalibri mecanicsverschraubung be provided to prevent loosening the Kalibri mecanicsverschraubung.
  • Such a backup can be performed for example in the manner of a security pin or a Sich ceremoniesssplints.
  • the fuse can be in the form of a (for example punctiform) weld joint which connects the calibration fitting to the pump housing.
  • the pump is advantageous if the axial calibration device comprises a plurality of screw connections, which are each arranged on a circle around the axis.
  • the fittings can be bolted to a common tool to calibrate the pump.
  • Such a tool can for example be referred to as a multi-head screwdriver, with the same time several glands can be tightened.
  • the circle on which the screw connections are arranged is preferably arranged concentrically around the axis of the pump.
  • the pump is advantageous if a stationary seal is provided between the outlet and the inlet, with which a backflow of liquid is prevented against the conveying direction.
  • the pump has a pump housing with at least one inlet and at least one outlet, wherein on the pump housing, an eccentric is arranged, which is rotatable about an axis relative to the pump housing, and wherein between the pump housing and the eccentric, a deformable element is arranged at least one conveying path is delimited by the at least one inlet to the at least one outlet and at least one displaceable seal of the conveying path is formed, which separates at least one closed pump volume in the conveying path, and further the at least one displaceable seal by a movement of the eccentric for conveying the liquid is displaceable along the conveying path in a conveying direction from the inlet to the outlet.
  • the method comprises at least the following steps:
  • the described method can be carried out inter alia for the pump type described above with the calibration device provided on the pump.
  • the method steps b) and c) are then carried out with the adjustable axial calibration device.
  • the calibration then takes place using a pump-external calibration device, which consists for example of a pump test bench and a tool for exerting the axial force and for fixing the calibration component.
  • the calibration component is, for example, a cover with which the pump housing is closed.
  • the calibration in step b) can be performed force-controlled or path-controlled. Combinations of force-controlled calibration and path-controlled calibration are also necessary.
  • Force-controlled calibration sets the force that acts on the deformable element.
  • the space available for the deformable element in the axial direction is set. This space is limited, for example, by the distance between two abutment surfaces against which the deformable element rests on both sides in the axial direction.
  • Step a) comprises in particular a mounting of the components of the pump with each other, so that the pump is basically functional.
  • step b) the assembled pump is now set concretely with regard to their operating behavior, in particular with regard to the (reproducible) accuracy of the delivery rate per delivery cycle.
  • an axial force on the deformable element is accordingly increased in step b) (and possibly also reduced again) until the desired target parameter of the operating behavior has been reached.
  • this state is permanently preserved by fixing the calibration component serving to generate the axial force in its position (step c)).
  • the method described is particularly advantageous if, in step c), the pump housing is connected to the calibration component by welding.
  • the pump housing By welding, a particularly durable and rigid connection between the pump housing and the calibration component can be achieved.
  • the calibration component it is also possible for the calibration component to be clamped and / or screwed to the pump housing.
  • the method is advantageous if the pump is heated at least during one of the two steps b) and c).
  • the deformable element conforms to the adjacent components and / or the operation of the pump.
  • the adaptation of the deformable element can be accelerated if the deformable element is heated.
  • there may be a plastic deformation of the deformable element which allows a permanent adaptation of the deformable element to the remaining components of the pump (in particular the eccentric and the pump housing).
  • the heating it is possible, for example, for the pump to be exposed to a temperature of more than 60 ° C. and in particular between 70 ° C. and 110 ° C. during steps b) and c).
  • the suitable temperature for the heating in the context of the calibration depends in particular on the materials of which the pump housing, the eccentric and the deformable element consist.
  • the temperature during steps b) and c) is above a transition temperature at which the material properties of the deformable element change significantly.
  • the method is advantageous if an overpressure is generated in the conveying path at least during one of the two steps b) and c).
  • the deformable element adapts to the conditions which also exist during the regular operation of the pump. drive the pump present.
  • a pressure of at least 2 bar, but preferably of at least 6 bar can be set in the conveying path. It is preferable not to increase the pressure significantly above 15 bar, because otherwise the axial forces for setting the pump during calibration can become too high.
  • step b) is carried out for a minimum period of at least 5 seconds, preferably at least 30 seconds, before the fixation takes place in step c).
  • a certain amount of time may be required for the adaptation of the deformable element, because the deformation processes taking place in the deformable element (for example creeping processes) do not take place immediately. Because the calibration in step b) takes place in a minimum period, it can be ensured that the deformation processes within the pump and in particular the deformation processes of the deformable element are completed before the fixation takes place. The deformable element has then placed in a final position. However, it is preferred that the minimum period does not exceed 10 minutes or even only 5 minutes, because thereafter only very small changes occur and, in addition, the manufacturing process of the pump would be extended too much.
  • the method is advantageous if the eccentric is moved during step b) and the pump delivers liquid, the delivery rate of the pump is monitored and the calibration is adjusted if the delivery rate of the pump does not correspond to a predetermined delivery rate.
  • the calibration it is possible to adapt a force and / or distance acting on the deformable element in the axial direction between two contact surfaces on which the deformable element rests on both sides in the axial direction. If the delivery rate is less than the predetermined delivery rate, then the axial force is preferably reduced and / or increases the distance of the contact surfaces. If the delivery rate is greater than the predetermined delivery rate, then the axial force is preferably increased and / or the distance of the contact surfaces reduced.
  • a monitoring of the calibration during a delivery can also be combined with one of the measures described above (heating, overpressure and / or minimum period) in order to achieve a particularly accurate calibration of the pump.
  • the delivery of the pump takes place at a certain pressure difference between the inlet s and the outlet. This pressure difference preferably corresponds to the usual operating conditions of the pump.
  • the particular advantages and design features described for the described method can be applied and transferred analogously to the described pump.
  • the method described can be carried out in particular with all pumps described with an adjustable axial calibration device.
  • the method described is for pumps that are also performed without an adjustable axial calibration device with a corresponding calibration tool or a corresponding calibration setup.
  • the described pump types with an adjustable axial calibration device it is possible to perform the calibration of the pump during an operating phase of the pump (after completion of the production of the pump).
  • the adjustable axial calibration device preferably also a (later che) adjustment of the flow rate of the pump take place when the flow rate changes, for example, as a result of aging of the pump.
  • the pump By calibrating the pump, it is possible, in particular, to compensate for manufacturing tolerances of the pump, which result in particular from inaccuracies (the position, the shape, etc.) of the eccentric and the pump housing. Nevertheless, the delivery rate of the pump can still be adjusted very precisely to a desired (nominal) flow rate.
  • the manufacturing tolerances and inaccuracies of eccentric and pump housing are compensated during calibration by a stronger or weaker crushing or pre-deformation of the deformable element. This stronger or weaker pre-deformation or crushing of the deformable element leads to a different energy absorption of the pump during the rotation of the eccentric.
  • a motor vehicle comprising an internal combustion engine, an exhaust gas treatment device for cleaning the exhaust gases of the internal combustion engine and a device for adding a liquid (in particular urea-water solution) for exhaust gas purification in the exhaust treatment s device with a described pump or with a pump was prepared according to the described method.
  • a liquid in particular urea-water solution
  • FIG. 1 shows a first embodiment of a described pump
  • FIG. 2 shows an isometric view of a described pump
  • FIG. 3 shows a second embodiment of a described pump, a cross section through a described pump
  • FIG. 5 shows a cross section through a further described pump
  • FIG. 6 shows a cross section through yet another described pump
  • Fig. 8 shows a cross section through yet another described pump
  • FIGS. 1 and 3 show two different variants of a described pump 1, which each have a deformable membrane 19 as a deformable element 7.
  • FIGS. 1 and 3 each show a coordinate system with the axis 6, the radial direction 28 and the circumferential direction 29.
  • the deformable element 7 is arranged in the pump housing 2 between the pump housing 2 and the eccentric 5.
  • the pump housing 2 has an inlet s 3, through which liquid can flow into the pump housing 2 with a conveying direction 11, and an outlet s 4, through which liquid can flow out of the pump housing 2 with a conveying direction 11.
  • the eccentric 5 is rotatably arranged in the pump housing 2 about an axis 6. When the eccentric 5 rotates, the rotation of the eccentric 5 is transmitted via a bearing 30 into a rolling movement of the deformable element 7 on the pump housing 2. As a result, the deformable element 7 abuts against the pump housing 2 in regions and forms a seal 9. Between the pump housing 2 and the deformable element 7 there is a conveying path 8 from the inlet 3 to the outlet 4.
  • This conveying path 8 is subdivided by the at least one seal 9 into at least one pump volume 10.
  • a stationary seal 25 which prevents a backflow of liquid from the inlet 3 to the outlet 4.
  • the seal 25 is executed in the embodiment of a pump 1 according to FIG. 1 with the aid of a indentation 26 of the pump housing 2, which presses the deformable element 7 against the pump housing 2 such that no backflow from the inlet 3 to the outlet 4 becomes possible.
  • the seal 25 is achieved by a local thickening of the deformable element 7 in the region of the stationary seal 25. This local thickening is generated by a pin 27 which is inserted into the deformable element 7.
  • FIG. 2 shows an isometric view of the pump 1.
  • the axis 6, the radial direction 28 and the circumferential direction 29 as well as the axial direction 13, which runs parallel to the axis 6, can be seen.
  • the pump housing 2 with the inlet 3 and the outlet 4.
  • a drive 32 is arranged, which moves the eccentric, not shown, in the pump housing 2 via a shaft 31.
  • Fig. 7 shows a particular embodiment of a pump 1, in which as a deformable element 7, a tube 17 is used.
  • the tube 17 is inserted in the pump housing 2 and simultaneously forms the inlet 3 and the outlet 4, whereby liquid can flow with a conveying direction 11 through the inlet 3 into the tube 17 and can flow out through the outlet 4.
  • an eccentric 5 is arranged, which is rotatably mounted about the axis 6. The eccentric 5 presses the tube 17 together with the housing 2 in sections, so that seals 9 are formed, to which a 17 formed by the tube conveying path 8 is closed, so that along the tube 17 and the conveying path 8 at least a closed pump volume 10 is formed.
  • 4, 5, 6 and 8 show cross-sections through four different embodiments of the pump 1.
  • FIGS. 4, 5, 6 and 8 are individually or in any way combined with each other on the various in Figs. 1, 3 and 7 illustrated variants of the pump transferable.
  • the cross sections shown in FIGS. 4, 5, 6 and 8 do not correspond exactly to each of the embodiments of the pump shown in FIGS. 1, 3 and 7, but are, as far as is technically possible, for all in FIGS , 3 and 7 illustrated embodiments of the pump 1 applicable.
  • FIGS. 4, 5, 6 and 8 will be explained together in order to discuss differences between the illustrated variants.
  • the pump 1 with the pump housing 2, the eccentric 5, the axis 6, about which the eccentric 5 is movable, and the deformable element 7.
  • FIGS. 4 the pump 1 with the pump housing 2, the eccentric 5, the axis 6, about which the eccentric 5 is movable, and the deformable element 7.
  • the deformable element each have a deformable membrane.
  • the conveying path 8 and the pump volume 10 are limited by the deformable element 7 and the pump housing 2.
  • the deformable element 7 is a tube 17, which delimits the delivery path 8 and the pump volume 10.
  • the bearing 30, with which a rotational movement about the axis 6 can be converted into an eccentric tumbling movement, can also be seen in each case.
  • the calibration takes place in each case in the axial direction 13 parallel to the axis 6.
  • This is done in the embodiments according to FIGS. 4 and 8 by means of an adjustable calibration means 12.
  • the adjustable calibration means 12 is designed as a central Kalibrierverschraubung 15.
  • the central Kalibrierverschraubung 15 braces a calibration component 20, which can be referred to as the lid of the pump 1, with the pump housing 2, wherein the tension via a tension anchor 33rd is done, which connects the adjustable calibration means 12 (the central Kalibrierverschraubung 15) and the calibration member 20 with the housing 2.
  • a tension anchor 33 is only one possibility for a central calibration fitting 15. It would also be possible for a thread to be arranged on the pump housing 2 and / or on the calibration component 20 and screwed directly to the pump 1 calibrate or to clamp the deformable element 7 axially.
  • the axial calibration device is achieved by means of screw connections 16 which are arranged on a circle 34 around the axis 6 of the pump 1.
  • a calibration member 20 are screwed to the pump housing 2.
  • By adjusting the torque with which the screwed connections 16 are tightened likewise a position of the contact surfaces 14 relative to one another and thus a distance 41 of the contact surfaces 14 are influenced so that the deformable element 7 is adapted or deformed in the axial direction 13.
  • no axial calibration device is provided on the pump 1 itself. The calibration can be done here rather in the assembly of the pump 1 by an axial force 35 is exerted on a calibration component 20 of the pump 1.
  • the calibration member 20 may be fixedly connected to the pump housing 2 to set the position of the calibration member 20 relative to the pump housing 2, so that the distance 41 of the two abutment surfaces 14 is defined to each other.
  • This permanent fixation of the calibration component 20 relative to the pump housing 2 can take place, for example, with a weld 21.
  • FIG. 9 shows a motor vehicle 22 comprising an internal combustion engine 23 and an exhaust gas treatment device 24 for purifying the exhaust gases of the internal combustion engine 23.
  • an SCR catalytic converter 39 with which the method of selective catalytic reduction for exhaust gas purification is carried out can be.
  • the exhaust treatment device 24 with a device 40, a liquid additive (aqueous urea solution) are fed to the exhaust gas purification.
  • the apparatus 40 has a tank 36 for storing the liquid additive, a conduit 37 for conducting the liquid additive and an adding device 38 for adding the liquid additive to the exhaust gas treatment device 24.
  • a pump 1 is provided, with which a promotion of the liquid additive can take place.
  • the pump 1 preferably has a precise calibration, so that the pump provides a predetermined flow rate particularly accurate.
  • a device 40 with a described pump 1 is particularly preferably used in combination with an adding device 38, which has only a passively opening valve and / or a nozzle for atomizing the liquid additive in the exhaust treatment device 24, but without an actively opening and closing metering valve manages. Rather, the dosage can be achieved by means of the pump described or by means of the pump 1 produced by the process described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

L'invention concerne une pompe (1), destinée à refouler un liquide, qui comporte un carter (2) doté d'au moins une admission (3) et d'au moins une évacuation (4). Un excentrique (5) est disposé sur le carter (2) de pompe et peut tourner selon un axe (6) par rapport au carter (2). Entre le carter (2) de pompe et l'excentrique (5) est disposé un élément déformable (7) qui permet de délimiter au moins un trajet de refoulement (8) d'au moins une admission (3) jusqu'à au moins une évacuation (4) et de former au moins un joint déplaçable (9) pour le trajet de refoulement (8) qui sépare au moins un volume de pompe fermé (10) dans le trajet de refoulement (8). Au moins un joint déplaçable (9) peut être déplacé par un mouvement de l'excentrique (5), pour refouler le liquide le long du trajet de refoulement (8) dans une direction de refoulement (11) de l'admission (3) jusqu'à l'évacuation (4). En outre, selon l'invention, la pompe (1) comporte au moins un dispositif de calibrage axial (12) qui peut être réglé de façon à précontraindre l'élément déformable (7) dans la direction axiale (13) parallèlement à l'axe (6).
EP14724489.1A 2013-06-13 2014-05-19 Pompe de refoulement de liquide Withdrawn EP3008341A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013106167.2A DE102013106167B4 (de) 2013-06-13 2013-06-13 Pumpe zur Förderung einer Flüssigkeit
PCT/EP2014/060234 WO2014198498A1 (fr) 2013-06-13 2014-05-19 Pompe de refoulement de liquide

Publications (1)

Publication Number Publication Date
EP3008341A1 true EP3008341A1 (fr) 2016-04-20

Family

ID=50732208

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Application Number Title Priority Date Filing Date
EP14724489.1A Withdrawn EP3008341A1 (fr) 2013-06-13 2014-05-19 Pompe de refoulement de liquide

Country Status (7)

Country Link
US (1) US10393102B2 (fr)
EP (1) EP3008341A1 (fr)
JP (1) JP2016524074A (fr)
KR (1) KR20160017092A (fr)
CN (1) CN105452660B (fr)
DE (1) DE102013106167B4 (fr)
WO (1) WO2014198498A1 (fr)

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DE102013106167B4 (de) 2013-06-13 2022-01-27 Vitesco Technologies GmbH Pumpe zur Förderung einer Flüssigkeit
DE102014112227A1 (de) * 2014-08-26 2016-03-03 Continental Automotive Gmbh Tank für eine Betriebsflüssigkeit für ein Kraftfahrzeug
DE102014112390A1 (de) * 2014-08-28 2016-03-03 Continental Automotive Gmbh Pumpe zur Förderung einer Flüssigkeit, insbesondere zur Förderung eines Abgasreinigungsadditivs
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DE102016102995A1 (de) * 2016-02-19 2017-08-24 Helmut Hechinger Gmbh & Co. Kg Schlauchpumpe
IT201700031729A1 (it) * 2017-03-22 2018-09-22 Ali Group Srl Carpigiani Pompa per l'erogazione di prodotti alimentari liquidi o semiliquidi o semisolidi e macchina comprendente detta pompa.

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Also Published As

Publication number Publication date
US10393102B2 (en) 2019-08-27
JP2016524074A (ja) 2016-08-12
WO2014198498A1 (fr) 2014-12-18
CN105452660A (zh) 2016-03-30
DE102013106167B4 (de) 2022-01-27
CN105452660B (zh) 2018-11-06
KR20160017092A (ko) 2016-02-15
US20160146078A1 (en) 2016-05-26
DE102013106167A1 (de) 2014-12-31

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