EP2242927B1 - Pompe à déplacement avec barrière contre la fuite de fluide - Google Patents

Pompe à déplacement avec barrière contre la fuite de fluide Download PDF

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Publication number
EP2242927B1
EP2242927B1 EP09702342.8A EP09702342A EP2242927B1 EP 2242927 B1 EP2242927 B1 EP 2242927B1 EP 09702342 A EP09702342 A EP 09702342A EP 2242927 B1 EP2242927 B1 EP 2242927B1
Authority
EP
European Patent Office
Prior art keywords
component parts
pump
displacement pump
subjected
pump according
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.)
Not-in-force
Application number
EP09702342.8A
Other languages
German (de)
English (en)
Other versions
EP2242927A2 (fr
Inventor
Franco Fermini
Giuseppe Omacini
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.)
VHIT SpA
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VHIT SpA
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Filing date
Publication date
Application filed by VHIT SpA filed Critical VHIT SpA
Publication of EP2242927A2 publication Critical patent/EP2242927A2/fr
Application granted granted Critical
Publication of EP2242927B1 publication Critical patent/EP2242927B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C18/3441—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps

Definitions

  • the subject of this invention is a displacement pump equipped with a barrier against the fluid leakage, intended to prevent or reduce the fluid exchanges between the inner space of the pump and the outside.
  • the fluid leakage between the inner space of the pump and the outside affects negatively in direct manner the pump performance mainly because, with reference to a vacuum pump, it involves a re-entry of air or fluids from the outside towards the inner pump space, thus impairing the depression level attained and the time needed for obtaining the same.
  • the fluid leakage affects negatively the performance even in an indirect manner, because it causes a removal of the oil lubricating the mutually displacing component parts, and in this manner involves an increase of the oil quantity needed for lubricating the pump and therefore an increase of the energy consumed by the device that supplies the lubricating oil, as well as an increases of the strain of the component parts.
  • the main object of this invention is to noticeably improve the performance of a displacement pump, particularly but not exclusively a vacuum pump, by reducing the performance loss directly and indirectly caused by the fluid leakages between the pump inner space and the outside.
  • Another object of the invention is to attain said object by technically simple means which do not introduce any difficulty in the pump manufacture.
  • Still another object of the invention is to attain the desired objects without noticeably increasing the costs of the pump.
  • a barrier suitable for preventing or reducing the fluid leakage, is inserted in at least one of the pump areas which are subjected to a fluid leakage between the inner space of the pump and the outside.
  • An example of a displacement pump with a barrier to reduce leakage is shown in WO02/18791 .
  • a sort of labyrinth which favores the seal against the fluid leakage.
  • Said step is provided on the component part that has the higher hardness, whereby during the first periods of operation the step hollows a seat in the component part having the lower hardness thus providing a particularly effective labyrinth. It is of advantage that to said step is done such a size that, also keeping into account the different thermal expansion coefficients of the component parts, the better operation conditions are attained in the conditions of use in which it is more important that the better seal against the fluid leakage is obtained, said step being in any event sized in such a way that in no operation condition any forcing is generated.
  • the radial extension of said step may advantageously be sized by taking into account the lubrication conditions.
  • some holes suitable for directing the lubricant to the gliding region of the step.
  • This first embodiment of the invention having the whole or a part of the stated features, is of particular advantage in view of its execution being simple and inexpensive.
  • At least one annular seat in one of the two component parts subjected to relative movement is provided at least one annular seat, and in this seat is housed an annular sealing element having a low friction coefficient, kept in sealing contact with both the component parts, also due to the different fluid pressure in the inner space of the pump and in the outside.
  • annular inclined area located facing said seat for an annular sealing element, whereby, due to the pressure difference between the inner fluid and the outer fluid, the annular sealing element is biased to contact against the annular inclined area.
  • the sealing barrier is provided in the region wherein there is a coupling joint driving the rotor, by forming on the fixed pump portion a step which acts as a closure for the rotor and keeps in position the driving coupling joint, the coupling clearance being annulled by the oil penetrating between the parts.
  • the displacement pump according to this invention is particularly suitable for use as a vacuum pump for automotive application, and for this reason the following description refers to said application, but it is to be specified that this application is not exclusive, and that the pump can be embodied for any different application of a displacement pump to the suction or compression of gases or liquids.
  • a displacement vane pump such as a vacuum pump for automotive application, comprises a body 1 delimiting a chamber 3 wherein is housed a rotor 4, which is rotatably mounted in support members 2 of body 1, and is driven by a motor (not shown) by means of a driving coupling joint 5.
  • the rotor is tangent along a line 6 to the pump body 1, and it carries a vane 7 which, when rotated by the rotor within chamber 3 with its own end portions contacting the wall of body 1, operates the pumping action in a manner which is well known to those skilled in the art.
  • the area subjected to fluid leakage is mainly represented by the guide members at the motor side.
  • a fluid leakage between the inner pump chamber 3 and the outside may take place, in particular, along the contact surface between the rotor 4 and the supporting member 2 of body 1; this surface corresponds to line L in the section of Figure 2 .
  • the area interested to the fluid leakage, to which refer the different solutions presented within the scope of the invention, is represented in detail in Figure 3 .
  • displacement pumps and in particular the vacuum pumps, are manufactured of plastics and aluminum alloys, because this ensures advantages in terms of costs, weight and balancement of the forces present, but this fact introduces differences in the thermal coefficients of the component parts, and therefore increased difficulties in the design with reference to the clearances, from which depend the fluid leakages in the different temperature zones. This fact makes more urgent the requirement for a reduction of these fluid leakages, that is the object of the invention.
  • a first embodiment according to the invention involves the provision of at least one step 4.1 in the region of the guide diameter.
  • the step 4.1 is provided on the less yielding element, that in this case is the rotor 4, but in general it may be rotor 4 or support 2, in accordance with the materials used in the manufacture of the component parts.
  • the size of the step is chosen in such a way that, in the operating conditions, the coupling is of uncertain type. According to the choice of the materials present in this coupling, different coefficients of thermal expansion may be observed, and therefore, when the coefficient of thermal expansion of the materials is different, the field of the functional clearance varies depending on the operation conditions. For this reason the step should be sized by keeping into account the operation conditions wherein it is more important that the better condition is attained. In any event, the step should be sized in such a way that in no operation condition any forcing is generated.
  • the less yielding component part on which the step is provided hollows a seat in the more yielding component part, thus providing a sort of labyrinth favoring the seal against the fluid leakage.
  • the height of the step zone will be sized by taking into account the height of the guide component part and the lubrication conditions.
  • a second embodiment of the invention is represented in Figure 5 .
  • a seat 2.1 wherein is housed an annular sealing element 8 having a low friction coefficient.
  • the diameter of the corresponding region is chosen in such a way as to favor the accommodation of the sealing element 8.
  • this solution to a vacuum pump, one should keep into account the fact that the pressure value inside the pump is lower than the outer pressure, whereby the annular sealing element 8 is pushed to contact the seat 2.1 at a side of the supporting part and to contact the rotor.
  • the third embodiment represented in Figure 6 is a modification of the embodiment of Figure 5 .
  • a region of light interference is provided between the annular sealing element 8 and rotor 4.
  • the fourth embodiment represented in Figure 7 is a modification of the embodiment of Figure 5 .
  • the annular sealing element 8 which is housed in its seat 2.1 formed in the supporting part 2, rests at the rotor side against an inclined annular region, which is represented in the section by the inclined line 4.2.
  • the component parts remain in mutual contact and, due to the pressure difference between the inner and outer spaces, the annular sealing element 8 is biased to adapt itself to the annular surface represented by the inclined line 4.2.
  • the seal against the fluid leakage is obtained by forming a step or flange 2.2 on the fixed part 2 of the pump.
  • the step 2.2 formed on the supporting part 2 acts as a closure for rotor 4 and keeps in position the driving joint 5.
  • the clearance is compensated by oil entering between the joint seat at the motor side and the joint itself.
  • this invention concerns the provision of a barrier in a displacement pump (and specifically in a vacuum pump) as well as the geometry of this barrier, which can be fixed (if formed by machining or molding) or movable (in the case of the insertion of an annular sealing element) and, when provided in correspondence of the region of possible communication between the inner space of the pump and the outside within the rolling region of rotor, contributes to improve the performances of the pump both in the temperature field in which the pump should operate and outside this temperature field.
  • the quantity of oil required for lubricating the pump is reduced, and this allows to dispose of more oil for other motor components or to use a lubrication pump of reduced volume.
  • the energy absorbed by the lubrication pump is reduced because of its better efficiency and of the reduced oil quantity to be treated by the pump.
  • the strain of the component parts is reduced because of the lower air and oil quantity to be treated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Claims (9)

  1. Pompe volumétrique actionnée par un moteur, dans laquelle une barrière (4.1, 8, 2.2) susceptible d'empêcher ou de réduire la fuite de fluide est insérée dans au moins une des zones de la pompe sujettes à fuite entre l'espace interne à la pompe et l'extérieur et dans laquelle dans une des deux parties composantes (2, 4) sujettes à mouvement relatif est réalisé au moins un gradin (4.1) qui détermine une zone limitée de contact réciproque entre les deux parties composantes (2, 4) sujettes à mouvement relatif, en créant ainsi une sorte de labyrinthe qui favorise l'étanchéité à la fuite de fluide, caractérisée en ce que ledit gradin (4.1) est réalisé sur la partie composante (2, 4) qui présente une plus grande dureté, de sorte que, pendant les premières phases de fonctionnement, le gradin creuse un siège dans la partie composante (4, 2) ayant une plus faible dureté, réalisant ainsi un labyrinthe ayant une efficacité particulière.
  2. Pompe volumétrique selon la revendication 1, caractérisée en ce qu'audit gradin (4.1) est attribuée une dimension telle que, en tenant compte également des différents coefficients de dilatation thermique des parties composantes (2, 4), les meilleures conditions de fonctionnement sont réalisées dans les conditions d'emploi dans lesquelles il est plus important d'obtenir la meilleure étanchéité contre la fuite de fluide, ledit gradin (4.1) étant en tout cas dimensionné de façon à ce que dans aucune condition de fonctionnement ne se créent des forçages.
  3. Pompe volumétrique selon la revendication 1, caractérisée en ce que l'extension radiale dudit gradin (4.1) est dimensionnée en tenant compte des conditions de lubrification.
  4. Pompe volumétrique selon la revendication 1, caractérisée en ce que dans une desdites parties composantes (2, 4) sont réalisés des trous susceptibles d'amener le lubrifiant à la zone de coulissement du gradin (4.1).
  5. Pompe volumétrique selon la revendication 1, caractérisée en ce que dans une des deux parties composantes (2, 4) sujettes à mouvement relatif est réalisé au moins un siège annulaire (2.1), et que dans ce siège (2.1) est logé un élément annulaire d'étanchéité (8) ayant un bas coefficient de frottement, mis en contact d'étanchéité avec les deux parties composantes (2, 4), pour effet aussi de la différence de pression des fluides à l'intérieur de la pompe et à l'extérieur.
  6. Pompe volumétrique selon la revendication 5, caractérisée en ce que, lorsque la pompe est une pompe à vide, la pression à l'intérieur de la pompe étant inférieure à la pression à l'extérieur de la pompe, ledit élément d'étanchéité (8) est poussé par la différence de pression contre ledit siège (2.1) réalisé dans une desdites parties composantes (2, 4) et contre l'autre partie composante (4, 2).
  7. Pompe volumétrique selon la revendication 5, caractérisée en ce que, entre l'élément annulaire d'étanchéité (8) et une des deux parties composantes (2, 4) sujettes à mouvement relatif, est réalisée une zone de faible interférence.
  8. Pompe volumétrique selon la revendication 5, caractérisée en ce que sur une des deux parties composantes (2, 4) sujettes à mouvement relatif est réalisée une zone annulaire inclinée (4.2) située en face dudit siège (2.1) pour un élément annulaire d'étanchéité (8), de sorte que, par effet de la différence de pression entre le fluide interne et le fluide externe, l'élément annulaire d'étanchéité (8) est sollicité en contact contre la zone annulaire inclinée (4.2).
  9. Pompe volumétrique selon la revendication 1, caractérisée en ce que la barrière d'étanchéité (2.2) est placée dans la région où se trouve un joint d'accouplement (5) qui actionne le rotor (4), en réalisant sur la partie fixe (2) un gradin (2.2) qui sert de fermeture pour le rotor (4) et qui maintien en position le joint d'entraînement (5), le jeu d'accouplement étant annulé par l'huile qui pénètre entre les parties.
EP09702342.8A 2008-01-16 2009-01-12 Pompe à déplacement avec barrière contre la fuite de fluide Not-in-force EP2242927B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20080033 ITTO20080033A1 (it) 2008-01-16 2008-01-16 Pompa volumetrica con barriera contro il trafilamento di fluido
PCT/EP2009/000244 WO2009090079A2 (fr) 2008-01-16 2009-01-12 Pompe à déplacement avec barrière contre la fuite de fluide

Publications (2)

Publication Number Publication Date
EP2242927A2 EP2242927A2 (fr) 2010-10-27
EP2242927B1 true EP2242927B1 (fr) 2016-07-27

Family

ID=40290389

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09702342.8A Not-in-force EP2242927B1 (fr) 2008-01-16 2009-01-12 Pompe à déplacement avec barrière contre la fuite de fluide

Country Status (4)

Country Link
EP (1) EP2242927B1 (fr)
CN (1) CN101910638B (fr)
IT (1) ITTO20080033A1 (fr)
WO (1) WO2009090079A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2950940B1 (fr) * 2009-10-07 2012-11-16 Peugeot Citroen Automobiles Sa Pompe a vide a palette
CN102661280A (zh) * 2012-04-28 2012-09-12 山东三牛机械有限公司 罗茨风机主动轴轴端密封系统
DE102018105144A1 (de) * 2018-03-06 2019-09-12 Schwäbische Hüttenwerke Automotive GmbH Axiales Dichtelement Vakuumpumpe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9708397D0 (en) * 1997-04-25 1997-06-18 Boc Group Plc Improvements in vacuum pumps
US6325602B1 (en) * 1999-09-23 2001-12-04 John J. Rademacher Automotive vacuum pump
SE0003075D0 (sv) * 2000-08-31 2000-08-31 Delaval Holding Ab Vacuum pump
CN100370141C (zh) * 2002-10-15 2008-02-20 三菱电机株式会社 叶轮式真空泵
GB0607198D0 (en) * 2006-04-10 2006-05-17 Wabco Automotive Uk Ltd Improved vacuum pump

Also Published As

Publication number Publication date
WO2009090079A2 (fr) 2009-07-23
CN101910638A (zh) 2010-12-08
WO2009090079A3 (fr) 2009-11-12
CN101910638B (zh) 2013-06-12
EP2242927A2 (fr) 2010-10-27
ITTO20080033A1 (it) 2009-07-17

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