EP2379893A2 - Pompe pour refouler un fluide, en particulier pompe de dosage - Google Patents

Pompe pour refouler un fluide, en particulier pompe de dosage

Info

Publication number
EP2379893A2
EP2379893A2 EP09774629A EP09774629A EP2379893A2 EP 2379893 A2 EP2379893 A2 EP 2379893A2 EP 09774629 A EP09774629 A EP 09774629A EP 09774629 A EP09774629 A EP 09774629A EP 2379893 A2 EP2379893 A2 EP 2379893A2
Authority
EP
European Patent Office
Prior art keywords
pump
coupling
drive shaft
coupling part
output shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09774629A
Other languages
German (de)
English (en)
Inventor
Martin Stiegler
Herbert Martin
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.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP2379893A2 publication Critical patent/EP2379893A2/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Withdrawn legal-status Critical Current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
    • 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
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • 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
    • F04C2220/00—Application
    • F04C2220/24—Application for metering throughflow
    • 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
    • F04C2240/00—Components
    • F04C2240/50—Bearings

Definitions

  • the invention relates to a pump for conveying a fluid, in particular a metering pump for metering a coating agent in a coating installation.
  • a gear pump is used as a metering pump whose structure is described for example in DE 10 2005 059 563 Al and shown schematically in Figure 3.
  • the conventional gear pump 1 has two parallel end plates 2, 3, between which a middle plate 4 is arranged, wherein the middle plate 4 has recesses for two gears 5, 6 which mesh with each other and pump the paint to be applied.
  • the gear 5 is mounted on a shaft 7 and is driven by the gear 6, wherein the shaft 7 is mounted in two bearing points 8, 9 in the two end plates 2, 3.
  • the other toothed wheel 6 is mounted on a drive shaft 10 and is driven by an output shaft 12 via a clutch 11, wherein the output shaft 12 is a connecting shaft, which is driven by a drive motor 13 via a further clutch.
  • the output shaft 12 can consist of an electrically insulating material in order to enable potential separation.
  • the output shaft 12 may also generally be a connecting shaft.
  • the connecting shaft is mainly used for the drive on the robot arm, wherein the Drive motor is positioned at a distance of approx. 800mm distance.
  • the connecting shaft can be designed as insulating shaft. This allows a potential separation between the pump under high voltage and the drive motor under operating voltage, or ground potential.
  • the drive shaft 10 of the pump 1 is in this case within the
  • the coupling 11 between the drive motor 13 and the pump 1 is formed in the prior art, for example, as a dog clutch, metal bellows, gear coupling o- magnetic coupling.
  • a disadvantage of this conventional design is first the fact that the external coupling 11 requires additional space, making it difficult to install the entire assembly on a robot arm of a painting robot, since the available space is limited there.
  • the clutch 11 is usually a commercially available clutch, which is available for the required drive torque only in certain sizes, whereby the required space for the entire arrangement is unnecessarily increased.
  • the invention is therefore based on the object to improve the conventional metering pump described above accordingly.
  • the invention includes the general technical teaching, existing in the prior art external clutch and / or the external bearing points structurally in the pump to integrate, which can reduce the required space.
  • the pump thus has a structurally integrated into the pump coupling to connect the drive shaft of the pump with an output shaft of a drive motor.
  • the pump has a pump housing in which the coupling is arranged, so that the coupling housing protects the integrated coupling against contamination.
  • the storage of the drive shaft of the pump normally arranged outside the pump bearing is structurally integrated into the pump.
  • the integrated bearing point is preferably dimensioned so that the integrated bearing point is also sufficient for supporting the output shaft of the drive motor, so that the output shaft of the drive motor requires no additional bearing between the pump and the drive motor. Preferably, therefore, no additional bearings are required between the drive motor and the pump according to the invention.
  • the integrated bearing point may have a rolling bearing or a slide bearing, which in itself from the prior
  • the drive shaft of the pump on the pump side of the integrated bearing can be sealed by at least one shaft seal, which is also known per se from the prior art and therefore need not be described in detail.
  • Conventional dosing pumps generally require a mounting bracket for mounting the pump to a substrate (eg a robot arm), whereby the height of the pump in the installed state is relatively large, which makes mounting on a robot arm more difficult the rule should be as lean as possible. Therefore, in the preferred embodiment, the invention provides that the pump can be mounted directly on a substrate without an additional holder with its underside, in particular on a robot arm of a painting robot.
  • This direct mounting of the pump without an additional holder allows a very small distance between the axis of rotation of the drive shaft of the pump and the bottom of the pump, which rests directly on the mounting surface of the ground. For example, this distance between the axis of rotation of the drive shaft of the pump and the
  • Mounting surface smaller than 50 mm, 40 mm, 30 mm, 20 mm or even less than 10 mm. It is within the scope of the invention, therefore, the possibility that the distance between the axis of rotation of the drive shaft of the pump and the mounting surface is smaller than the diameter of the drive shaft.
  • the metering pump can also be mounted by means of a concentric clamping flange in the area of the bearing housing. In principle, all types of fastening possibilities are conceivable.
  • the coupling has a first coupling piece, which is rotationally rigidly connected to the drive shaft of the coupling and in the coupled state forms a positive connection with a second coupling piece, which is torsionally rigidly connected to the output shaft of the drive motor.
  • the two coupling pieces can therefore be positively connected with each other and then form a torsionally rigid, positive, substantially damping-free and not switchable connection between the output shaft of the drive motor and the drive shaft of the pump.
  • these two coupling pieces are complementarily shaped, so that the first coupling piece can be coupled only with the correspondingly complementarily shaped second coupling piece and forms a positive connection, but not with an output shaft without a correspondingly shaped coupling piece.
  • the pump according to the invention can therefore not be replaced by a commercially available pump, which has no correspondingly adapted coupling piece. This prevents the operators of paint shops replace the metering pump according to the invention in a wear-related malfunction by a commercially available metering pump that does not meet the required technical specifications and therefore could lead to a safety hazard during operation of the paint shop.
  • the individual design of the coupling according to the invention thus contributes to the reliability of the paint shop.
  • the individual first coupling piece is preferably inseparably mounted to the drive shaft of the pump to prevent mounting of a conventional shell clutch on the drive shaft.
  • the clutch according to the invention is thus preferably designed so that a disassembly of the clutch with the aim of connecting a commercially available metering pump is not possible.
  • the two coupling parts in each case on the front side circular sector-shaped and axially projecting driver, which are received between appropriately adapted circular sector-shaped drivers of the other coupling part and form a positive connection.
  • the two Coupling thus pushed together coaxially until the circular sector-shaped driver between the niksektorformigen driver of each other coupling part are introduced.
  • one coupling piece may have an external hexagonal profile, while the other coupling position has a correspondingly adapted internal hexagonal profile.
  • three, four, five, seven and eight-Kant profiles are possible, to name just a few examples.
  • the one coupling part has an axially projecting driver pin, which engages in the coupled state in a suitably adapted aaxially extending receiving bore in the other coupling.
  • a suitably adapted aaxially extending receiving bore in the other coupling Preferably, two pairs of driving pins and receiving bores are provided in this case, which are arranged diametrically to the axis of rotation of the drive shaft.
  • another variant of the invention has a curved tooth coupling, one coupling piece having an outer toothing and the other coupling stucco having a correspondingly adapted internal toothing, which engage in one another in the coupled state.
  • the external teeth and the internal teeth of the two coupling point are not carried out in accordance with standards, but designed individually to prevent coupling with a conventional coupling, which is useful from the above-mentioned safety considerations.
  • This individual design of the internal toothing or the external toothing can be realized by the fact that the external or internal teeth distributed over the circumference differently large teeth or tooth gaps.
  • the inventive curved tooth coupling therefore does not fit conventional coupling parts, which prevents replacement of the metering pump according to the invention by a commercially available metering pump which does not correspond to the technical specifications.
  • the coupling has three coupling points, wherein the first coupling part is rotationally rigidly connected to the drive shaft of the pump, while the second coupling part is rotationally rigidly connected to the output shaft of the drive motor.
  • the third coupling part is inserted between the first coupling part and the second coupling part and in the coupled state forms a positive connection with the first coupling part and with the second coupling part.
  • This positive connection can be realized, for example, by virtue of the fact that the first coupling part and the second coupling part have axially protruding claws on the front side, which engage in corresponding receptacles in the middle coupling part.
  • the two axially outer coupling parts are preferably integrally formed on the respective shaft ends or are formed by the respective shaft ends, so that only one free coupling part is present in the form of a connecting sleeve.
  • the coupling sleeve of the coupling provides a mechanical overload protection in order to prevent overload-induced damage to the drive shaft.
  • the connection pulse then already breaks at a torque which still provides the drive shaft with sufficient si- safety.
  • the tantad ⁇ lse preferably allows axial, radial and angular misalignment between the waves.
  • the coupling is surrounded by a casing which protects the coupling from contamination.
  • the sheath is substantially coaxial with the drive shaft of the pump, wherein the shroud has at its distal end an insertion opening into which the output shaft of the drive motor with the second coupling piece can be inserted axially to couple the two coupling pieces together.
  • the drive shaft of the pump preferably does not protrude out of the casing with the first coupling piece in the axial direction, in order to prevent assembly of a commercially available conventional coupling.
  • the jacket of the coupling preferably has an inner diameter which has an excess compared with the outer diameter of the first coupling piece or of the drive shaft of the pump, which is smaller than 10 mm, 5 mm or 2 mm.
  • the insertion opening of the casing has a clear diameter, which has an excess compared to the outer diameter of the first coupling piece or the drive shaft of the pump, which is preferably smaller than 10 mm, 5 mm or 2 mm.
  • this relatively small excess in the coupled state prevents the ingress of dirt into the casing.
  • the relatively small oversize has the advantage that the replacement by commercially available, but unsuitable metering pumping, which contributes to the reliability of the paint shop.
  • the pump according to the invention is preferably a rotary piston pump, such as a gear pump.
  • gear pumps are described for example in the already cited patent application DE 10 2005 059 563 Al and well known from the prior art, so that can be dispensed with a detailed description of the structure and operation of a gear pump.
  • the disclosure content of the above-cited patent application DE 10 2005 059 563 A1 is fully attributable to the structure and the operation of a gear pump of the present description.
  • the invention is not limited to gear pumps with regard to the pump type, but can also be implemented with other pump types, such as wobble piston pumps, eccentric screw pumps and axial piston pumps, to name just a few examples.
  • the pump according to the invention is preferably a metering pump whose delivery rate is essentially independent of the pressure ratio between the pump inlet and the pump outlet.
  • the pump is preferably solvent-resistant and / or paint-resistant.
  • the metering pump according to the invention should have the smallest possible size to the assembly on a slender robot arm of To enable painting robots.
  • the integrated coupling therefore preferably does not protrude beyond the end plates of the gear pump in the radial direction with respect to the drive shaft, so that the size of the metering pump according to the invention is not increased by the integration of the coupling into the pump.
  • the coupling is preferably torsionally rigid, form-fitting, non-switchable, slip-free and / or essentially free of steam.
  • the inventive coupling for example, have an axial tolerance of at least 1 mm, 2 mm, 5 mm or 10 mm. This means that the drive shaft of the pump and the output shaft of the drive motor have a corresponding axial relative movement margin.
  • the coupling according to the invention can have an angle tolerance of at least 1 °, 2 °, 3 °, 4 ° or 5 °. This means that the drive shaft of the pump and the output shaft of the drive motor do not have to run exactly parallel, but can include a corresponding angle.
  • the aforementioned concept of integration of the clutch into the pump also includes that the clutch is arranged in a clutch housing flanged to the pump.
  • the invention is not limited to a pump as a single component, but also includes a corresponding coating device with such a pump.
  • the coating device according to the invention can be embodied, for example, as a painting robot and, in addition to the above-described pump according to the invention, comprises a drive motor for the pump and an atomizer for application of the coating agent metered by the pump.
  • the pump is mounted here together with the drive motor in or on the distal or proximal robot arm of the painting robot.
  • the coating device according to the invention is designed as a varnishing machine with a plurality of linear degrees of freedom of movement, for example as a so-called side machine or roof machine for painting the side surfaces or roof and hood surfaces of a motor vehicle body.
  • the invention also encompasses the novel use of a corresponding pump for dosing a coating agent in a coating installation.
  • FIG. 1A shows a cross-sectional view of a metering pump according to the invention
  • FIG. 1B shows a detail view of the metering pump from FIG. 1B
  • FIG. 2 shows a schematic representation of the metering pump according to the invention
  • FIG. 3 shows a schematic representation of a conventional arrangement of a metering pump with an external clutch and an associated drive motor
  • FIGS. 4A-4C show a variant of a coupling according to the invention with circular sector-shaped drivers which engage in one another in a form-fitting manner
  • FIGS. 7A-7C show a gear tooth coupling according to the invention
  • 8A is a cross-sectional view of another embodiment of a metering pump according to the invention with a different type of clutch and
  • Figure 8B is a perspective view of the coupling of the metering pump of Figure 8A.
  • FIGS. 1A and 1B corresponds in part to the gear pump 1 described initially and shown schematically in FIG. 3, so that reference is made to FIG. 3 to avoid repetition, the same being true for corresponding details Reference numerals are used.
  • an annular groove 16 is arranged, which receives a sealing ring, not shown for simplicity, which seals the shaft 7 against the associated bore in the face plate 2.
  • each end face corresponding annular grooves 17, 18, each receiving a sealing ring, which is also not shown for simplicity.
  • the sealing ring in the annular groove 17 in this case seals the gap between the middle plate 4 and the end plate 2, while the sealing ring in the annular groove 18 seals the gap between the middle plate 4 and the end plate 3.
  • a flushing medium bore 19 located in the end plate 2 is a flushing medium bore 19 through which flushing means can be supplied, wherein the supplied lubricant via lubricant channels 20, 21, 22 is passed to the lubrication points.
  • a special feature of this invention consists in the fact that a coupling housing 23 is flanged to the end plate 3, wherein the coupling housing 23 is screwed by a plurality of screws 24 with the end plate 3.
  • the drive shaft 10 of the gear pump 1 has at its distal end a shaft piece 25 with a stepped reduced diameter d2 ⁇ dl, wherein at the distal end of the shaft piece 25, a coupling piece 26 is mounted rotationally fixed.
  • the coupling piece 26 forms in the engaged state a positive connection with a correspondingly adapted coupling piece 27 which is rotationally rigidly connected to the output shaft 12 of the drive motor 13.
  • the shaft piece 26 of the drive shaft 10 of the gear pump 1 is in this case mounted inside the clutch housing 23 in a roller bearing 28, wherein the roller bearing 28 is dimensioned such that on the required in the prior art according to Figure 3 bearings 16, 17 between the gear pump. 1 and the drive motor 13 can be dispensed with.
  • the drive shaft 10 with the coupling piece 26 mounted thereon does not project out of the coupling housing 23 in the axial direction.
  • contamination of the coupling piece 26 is made more difficult because the surrounding coupling housing 23 protects against contamination.
  • a coupling of conventionally designed output shafts without the coupling piece 27 is made more difficult.
  • the coupling has only a single coupling part.
  • the integration of the clutch in the gear pump 1 allows a low overall height.
  • the gear pump 1 is mounted in this embodiment with its bottom 31 on a robot arm of a painting robot, wherein a distance a between the bottom 31 of the gear pump 1 and a rotation axis 32 of the drive shaft 10th can be smaller than 30 mm.
  • the inventive gear pump 1 thus allows due to their low height a very slim robot arm.
  • FIGs 4A-4C show a variant of a coupling according to the invention, which is shown in Figures IA and IB.
  • the two coupling pieces 26, 27 each frontally axially projecting, niksektorformige driver 33, 34 which engage in the coupled state into each other and form a form gleichige connection.
  • FIGS. 5A-5C show an alternative exemplary embodiment of a coupling according to the invention.
  • the coupling piece 26 has an inner octagonal profile 35
  • the other coupling piece 27 has a correspondingly adapted outer octagonal profile 36, wherein the two profiles of the coupling pieces 26, 27 positively engage in one another in the coupled state.
  • Figures 6A-6C show an alternative exemplary embodiment of a coupling according to the invention, in which 27 two axially projecting driving pins 37, 38 are arranged on the coupling piece, which engage in the coupled state in correspondingly adapted axially extending receiving bores 39, 40 in the other Kupplungsstuck 26 and thereby form a form-fitting, torsionally rigid connection.
  • FIGS. 7A-7C show a further variant of a coupling according to the invention in the form of a curved tooth coupling.
  • the coupling piece 27 has an external toothing 41 which, in the coupled state, engages in a correspondingly adapted internal toothing 42 of the other coupling piece 26.
  • FIGS. 8A and 8B show an alternative embodiment of a gear pump 1, this embodiment being largely identical to the exemplary embodiment described above and illustrated in FIGS. 1A and 1B, so that reference is made to the above description for avoiding repetition, wherein Details the same reference numerals are used.
  • a special feature of this embodiment is the coupling for connecting the drive shaft 10 with the output shaft 12.
  • the coupling piece 44 is inserted between the two coupling pieces 43, 45 and is positively connected in the coupled state with the coupling pieces 43, 45, so that the coupling piece 44 produces a positive connection between the two coupling pieces 43, 45.
  • the two coupling pieces 43, 45 four axially extending and distributed over the circumference ribs, which engage in corresponding axially extending and circumferentially distributed grooves in the coupling piece 44 and thereby form a torsionally rigid connection.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

La présente invention concerne une pompe (1) pour refouler un fluide, en particulier une pompe de dosage (1) destinée à doser un agent de revêtement dans une installation de revêtement, ladite pompe comprenant une entrée de pompe permettant l'apport du fluide, une sortie de pompe permettant l'émission du fluide et un arbre d'entraînement d'entrée (10) monté rotatif et destiné à entraîner mécaniquement la pompe (1), ainsi qu'un embrayage (26, 27) intégré à la structure de la pompe (1) et destiné à relier mécaniquement l'arbre d'entraînement d'entrée (10) de la pompe (1) à un arbre d'entraînement de sortie (12) d'un moteur d'entraînement (13).
EP09774629A 2008-12-19 2009-12-02 Pompe pour refouler un fluide, en particulier pompe de dosage Withdrawn EP2379893A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008063983A DE102008063983A1 (de) 2008-12-19 2008-12-19 Pumpe zum Fördern eines Fluids, insbesondere Dosierpumpe
PCT/EP2009/008601 WO2010078892A2 (fr) 2008-12-19 2009-12-02 Pompe pour refouler un fluide, en particulier pompe de dosage

Publications (1)

Publication Number Publication Date
EP2379893A2 true EP2379893A2 (fr) 2011-10-26

Family

ID=42220865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09774629A Withdrawn EP2379893A2 (fr) 2008-12-19 2009-12-02 Pompe pour refouler un fluide, en particulier pompe de dosage

Country Status (4)

Country Link
US (1) US20120267446A1 (fr)
EP (1) EP2379893A2 (fr)
DE (1) DE102008063983A1 (fr)
WO (1) WO2010078892A2 (fr)

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Also Published As

Publication number Publication date
DE102008063983A1 (de) 2010-07-01
WO2010078892A3 (fr) 2011-01-27
US20120267446A1 (en) 2012-10-25
WO2010078892A2 (fr) 2010-07-15

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