EP2307727A2 - Pompe à engrenages pompe à engrenages - Google Patents

Pompe à engrenages pompe à engrenages

Info

Publication number
EP2307727A2
EP2307727A2 EP09769113A EP09769113A EP2307727A2 EP 2307727 A2 EP2307727 A2 EP 2307727A2 EP 09769113 A EP09769113 A EP 09769113A EP 09769113 A EP09769113 A EP 09769113A EP 2307727 A2 EP2307727 A2 EP 2307727A2
Authority
EP
European Patent Office
Prior art keywords
gear pump
pump according
piston
detecting
sealing means
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Withdrawn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
EP09769113A
Other languages
German (de)
English (en)
Inventor
Arkardiusz Tomzik
Dietrich Witzler
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.)
Oerlikon Textile GmbH and Co KG
Original Assignee
Oerlikon Textile GmbH and Co KG
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 Oerlikon Textile GmbH and Co KG filed Critical Oerlikon Textile GmbH and Co KG
Publication of EP2307727A2 publication Critical patent/EP2307727A2/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Withdrawn legal-status Critical Current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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/322—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction perpendicular to the surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3296—Arrangements for monitoring the condition or operation of elastic sealings; Arrangements for control of elastic sealings, e.g. of their geometry or stiffness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings

Definitions

  • the invention relates to a gear pump according to the preamble of claim 1.
  • Gear pumps are used to boost and meter liquid media under pressure.
  • at least two intermeshing gears are provided in a housing enclosing a pressure chamber, which are driven in rotation and promote medium in their gaps between the teeth, which are enclosed by a narrow gap of the housing.
  • the occurring high pressures must be sealed to the drive shaft, which penetrates the housing, with a suitable sealant to the environment.
  • This object is achieved in that is used as a sealant for the shaft, an elastic seal.
  • a pressure medium which is independent of the fluid and thus the pressure of the pumped medium, the sealant is pressed against the surface to be sealed, which has a corresponding sliding surface at this point.
  • the advantage is that the contact pressure of the sealant to the sliding surface can be easily adjusted by changing the pressure of the pressure medium.
  • the sealing means is connected to the pump housing and seals the pump housing relative to the rotating shaft.
  • the sealant is connected via a channel or a line with a piston-cylinder unit.
  • the position of the piston in the cylinder adjusts the pressure.
  • a self-locking mechanical transmission such as a set screw, a wedge or a Sneckengetriebe.
  • the adjusting means may in turn be a hydraulically or pneumatically actuated piston-cylinder unit.
  • the manipulated variable can be applied by a further adjusting means, which is provided spatially away from the gear pump.
  • the hydraulically actuated piston-cylinder unit by the use of different piston surfaces enables a hydraulic power transmission, so that the hydraulically actuated piston-cylinder unit is subjected to a lower pressure.
  • the cavity of the sealant is formed in the assembled state by cooperation with a closure means, such as a sleeve, or with the pump housing.
  • the sealant is arranged in the form of a shear around the shaft. The required for pressing against the shaft annular cavity can be provided both partially in the sealant, as well as in closure means or the pump housing.
  • FIG. 3 the detail of another embodiment of the inventive gear pump in section.
  • a gear pump according to the invention is shown in section.
  • the principle of a gear pump is based on that the medium to be conveyed in the delivery chambers 6, 7, which form the tooth spaces of the meshing gears 3, 5, is transported.
  • the backflow of the medium is prevented on the one hand by a gear housing 3, 5 closely enclosing the pump housing and the other by the closed by the teeth of the meshing gears 3, 5 gap 8.
  • the gears 3 and 5 are arranged on the drive shaft 2 and the axis 4 rotating and meshing with each other and promote in the delivery chambers 6, 7, the medium to be pumped from a source, not shown here to a sink.
  • the gears 3, 5 are enclosed by a pump housing 1.
  • the pump housing is usually constructed of two final plates 9 and a surrounding the gears outside enclosure.
  • the drive shaft 2 penetrates the plate 9 of the pump housing and allows the drive of the gear third
  • the shaft 2 in the region of the seal on a sliding surface 23 which is sealingly enclosed by the sealing means 12.
  • the sealing means 12 is made of an elastic material, preferably plastic.
  • the shape of the sealant 12 is designed and cooperates with the enclosing pump housing 1 such that an annular cavity 24 is formed.
  • the cavity 24 is connected via a line 13 to a cylinder 15 and filled with a pressure medium.
  • a piston 14 which is adjustable via the thread 16 of an actuating means 17, the pressure acting in the cavity 24 on the sealing means 12, adjustable.
  • the assembly of the sealant can be done particularly easily in the parting line between the plate 9 and the attachment 10 here.
  • the pressure in the cavity 24 is adjusted so that the sealing means 12 is pressed with a contact force against the sliding surface of the shaft 2, which is sufficiently large to prevent leakage of the pumped fluid from the pump interior, on the other hand, low enough is to prevent excessive wear of the sealant 12.
  • FIG. 2 illustrates the gear pump illustrated in FIG. 1 in an alternative embodiment variant. This embodiment variant differs in three points from the gear pump illustrated in FIG.
  • a spring 19 is provided between the adjusting means 17 and the piston 14. This spring causes with increasing wear of the sealant 12, the pressure of the pressure medium is maintained over a longer period.
  • the cavity 24 is formed between the sealant 12 and a sleeve 18.
  • a radial bore in the sleeve ensures that the rest space 24 communicates with the conduit 13.
  • the sealing means 12 shown in Figure 2 has an annular circumferential pocket which forms a cavity 24 in connection with the sleeve. It is also possible that the sleeve 18 or the pump housing 1 in Figure 1 forms these pockets.
  • a means for detecting a leak is provided here.
  • the space around the drive shaft 2 on the environmental side next to the sealing means 12 by means of a leakage line 26 is connected to a cylinder 27 closed by a leakage piston 28.
  • Leakage of the pressurized fluid drives the piston 28 out, which is marked by the sensor 29.
  • the sensor 29 may in the simplest case be a pointer that is visually perceived by an operator.
  • the sensor can also be a sensor that converts the position of the piston 28 into an electrical signal, for example.
  • Figure 3 shows as a detail of the cylinder 15, the means for detecting a leak and a controller 30.
  • the piston 14 is connected to a control piston 20 which cooperates with a control cylinder 21.
  • the control piston 20 is in turn driven hydraulically by an external actuating means 17, which is not shown here.
  • This embodiment variant is particularly advantageous when the gear pump is used as a paint pump mounted on the end of a robot arm.
  • the control of the control piston 20 can be effected by means of a control means connected via the connecting line 22.
  • a further advantage of this embodiment variant is that different fluids can be used for the pressure medium on which the piston 14 acts and for the medium which acts on the control piston 20.
  • a medium can be used that is compatible with paint.
  • commercially available hydraulic oil can be used for the control of the control piston 20.
  • a ratio of the pressure can be achieved via the area ratio of the piston 14 and the control piston 20.
  • a means 25 for detecting the position of the piston 20 makes it possible to check the position of the piston 20. Since the position of the piston 20 corresponds to the state of wear of the sealing means 12, it is possible to control the wear.
  • the means 25 for detecting the position of the piston can be designed as a viewing window or as a sensor which converts the position of the piston 28 into an electrical signal, for example.
  • a control unit 30 is connected to the leakage sensor 29. This is also connected to the actuating means 17. When a leak is detected, the adjusting means 17 is actuated by the control unit 30, whereby the sealing means is readjusted. This can be done as a continuous control or in the form of a periodically carried out control measurement of the leakage.
  • the control unit 30 is connected to the means 25 for detecting the position of the piston.
  • the controller 30 is capable of the scope of To detect wear of the sealant 12 and, for example, to respond with an error message when the end of life of the sealant 12 reaches and further actuation of the actuating means 17 is no longer possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Fluid Mechanics (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

L'invention concerne une pompe à engrenages, par exemple une pompe pour laquage. L'étanchéité de l'arbre d'entraînement guidé, du bâti de pompe vers l'extérieur, est obtenue au moyen d'un agent d'étanchéité appliqué au moyen d'un fluide de pression. Ce fluide de pression est indépendant du liquide refoulé, et peut être amené sous pression au moyen d'un piston. Un moyen de réglage, qui agit, directement ou par l'intermédiaire d'un autre système hydraulique, sur le piston, permet de régler la pression.
EP09769113A 2008-06-17 2009-06-08 Pompe à engrenages pompe à engrenages Withdrawn EP2307727A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008028695 2008-06-17
PCT/EP2009/057049 WO2009156264A2 (fr) 2008-06-17 2009-06-08 Pompe à engrenages pompe à engrenages

Publications (1)

Publication Number Publication Date
EP2307727A2 true EP2307727A2 (fr) 2011-04-13

Family

ID=41381776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09769113A Withdrawn EP2307727A2 (fr) 2008-06-17 2009-06-08 Pompe à engrenages pompe à engrenages

Country Status (2)

Country Link
EP (1) EP2307727A2 (fr)
WO (1) WO2009156264A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2578648B (en) * 2018-11-02 2023-06-14 Romar International Ltd Apparatus, system and method for monitoring sealing devices

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114056790B (zh) * 2021-11-18 2023-03-21 湖南有色冶金劳动保护研究院有限责任公司 一种化工罐体用联锁装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE413200B (sv) * 1978-08-14 1980-04-28 Asea Atom Ab Tetningsanordning for tillfellig tryckavtetning
DE3347263C2 (de) * 1983-12-28 1995-07-13 Friatec Rheinhuette Gmbh & Co Verfahren und Vorrichtung zum Abdichten einer Pumpenwelle
DE3675011D1 (de) * 1986-01-30 1990-11-22 Dow Chemical Co Dichtung mit hydrodynamischem antrieb.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009156264A3 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2578648B (en) * 2018-11-02 2023-06-14 Romar International Ltd Apparatus, system and method for monitoring sealing devices

Also Published As

Publication number Publication date
WO2009156264A2 (fr) 2009-12-30
WO2009156264A3 (fr) 2010-02-25

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