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Vane pump

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Vane pump


The invention relates to a vane pump comprising a pump housing that has a sleeve-shaped housing body, a bottom, and a cover, with the bottom and cover axially closing the housing body. The vane pump also has a rotor, which lies eccentrically in the housing body and which is rotatably mounted in the bottom and the cover, and one or more vanes which are movably mounted in the rotor in an axial direction. Each vane has bearing pins on the axial end faces thereof, with the bearing pins engaging in the bottom and the cover.

Browse recent Joma-polytec Gmbh patents - Bodelshausen, DE
USPTO Applicaton #: #20130022487 - Class: 418146 (USPTO) - 01/24/13 - Class 418 
Rotary Expansible Chamber Devices > With Mechanical Sealing >Seal Element Between Vane And Cylinder >On Vane Side

Inventors: Torsten Helle, Benjamin Pyrdok, Willi Schneider, Dirk Ehrenfeld

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The Patent Description & Claims data below is from USPTO Patent Application 20130022487, Vane pump.

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The invention relates to a vane pump with a pump housing having a sleeve-shaped housing body, a bottom, and a cover, with the bottom and the cover axially closing the housing body, a rotor arranged eccentrically in the housing body and rotatably mounted in the bottom and cover, and one or more vanes which are mounted in the rotor for movement in axial direction.

Vane pumps are known in many configurations. They are intended to seal gaseous media, to produce a negative pressure, or to transport gaseous or liquid media. In these vane pumps, a rotor is eccentrically arranged in the pump housing and has several vanes which are movably mounted so as to form between the vanes and between the rotor and the inner circumferential surface of the pump housing forming the stator, work spaces that have continuously changing volumes, i.e. expand and contract. The vanes are hurled outwards by the centrifugal force when the rotor rotates and sweep on the inner circumferential surface of the pump housing. As a result, the respective work space is sealed against the neighboring work spaces. The sealing action is assisted by wetting the surface of the components with lubricating oil. This lubricating oil also serves to reduce frictional forces so that the power loss of the pump is reduced. It is considered disadvantageous however that the transported fluid becomes necessarily wetted with lubricant and possibly has to be cleaned before being either used again or released into the atmosphere. Moreover, lubricant is consumed.

The invention is based on the object to provide a vane pump which exhibits a lesser consumption of lubricant and in which the transported fluid is free of lubricant.

In accordance with the invention, this object is attained by a vane pump of the afore-described type by providing each vane at its axial end faces with bearing pins which engage in the bottom and the cover.

In the vane pump according to the invention, the vane is not only mounted in the rotor for movement in radial direction so as to be able to oscillate in radial direction in relation to the rotor in accordance with the eccentric disposition of the rotor in the pump housing but also has bearing pins which engage in the bottom and the cover so that the vane can be deliberately controlled via these bearing pins. This is possible because the bottom and the cover are stationary and the bearing pins revolve in the bottom and the cover.

For that purpose, the bottom and the cover have each a guideway for the bearing pins, with the bearing pins engaging in the guideways free of clearance or at slight clearance. Preferably, the guideways are configured as groove, with the guideway exhibiting in particular a circular shape and lying in coaxial relationship to the inner circumferential surface of the housing body. As a result, the vanes always assume a defined position in relation to the inner circumferential surface of the housing body. This has the advantage that this position is assumed even when the rotor does not revolve. As a result, when the rotation speeds are low and thus the centrifugal force is also small, it is ensured that the vanes still assume a defined position so that optimum transport results are achieved, already when the rotation speeds are low. This is of advantage e.g. when starting a combustion engine and the vane pump operates as lubricant pump. In this case, the lubricant is transported already at the start of the engine and not when higher rotation speeds are involved.

In a preferred exemplary embodiment, the bearing pin is formed by a bolt mounted in the vane. As a result, the vane can be produced as usually, for example as injection-molded part or a die-case part, which needs only to be provided with the bearing pin. The latter may, for example, be injected directly into the injection-molded part.

According to a refinement, the free end of the bolt, which end extends axially beyond the vane, supports a bearing, in particular a deep groove ball bearing. This deep groove ball bearing engages in the guideway and revolves in the bottom and the cover. Preferably, the deep groove ball bearing is self-lubricating so that the need for an additional lubrication can be omitted.

An essential feature of the invention resides in the presence of a gap between the radially outer vane tip and the inner circumferential surface of the housing body. This gap ensures that no frictional forces can establish between vane and housing body so that the vane is not exposed to wear on one hand, and the power loss of the pump is small on the other hand. The gap lies hereby at a range between 5 μm to 100 μm, and in particular between 10 μm and 50 μm.

In the event a complete sealing is desired or required, a sealing bar may be arranged on the radially outer vane tip. In an exemplary embodiment, a groove extends in the radially outer vane tip in length direction of the vane and receives a sealing bar which projects beyond the vane tip. This sealing bar is floatingly supported in the groove so as to be able to execute relative movements in relation to the vane. When the rotor rotates, this sealing bar is forced or hurled against the inner circumferential surface of the housing body to thereby completely seal the work space. As the weight of the sealing bar is virtually negligible in comparison to the vane, the frictional forces are minimal.

Preferably, the sealing bar is made of metal, especially light metal or of a plastic which is fiber-reinforced for example. Such sealing bars have a slight weight on one hand and are sufficiently wear-resistant on the other hand.

Preferably, the vane pump according to the invention is operated in the absence of lubricant, i.e. running dry. This has the advantage that the transported medium is not contaminated so that the need for oil separator or the like at the outlet of the vane pump is eliminated.

Further advantages, features and details of the invention are set forth in the sub-claims and the following description which describes in greater detail a particularly preferred exemplified embodiment with reference to the drawing. The features illustrated in the drawing and set forth in the description and the claims may be relevant individually or in any combination

The drawing shows in:

FIG. 1 a perspective view of the vane pump according to the invention;

FIG. 2 a side view in direction of the arrow II according to FIG. 1;

FIG. 3 a perspective view according to FIG. 1 with detached housing cover;

FIG. 4 a section IV-IV according to FIG. 2;

FIG. 5 a section V-V according to FIG. 4;

FIG. 6 a section VI-VI according to FIG. 4; and

FIG. 7 a perspective view of a vane, cut open in part.

FIG. 1 depicts a vane pump 10 which essentially includes a housing body 12 with cooling fins 14, a bottom 16 with fastening brackets 18, and a cover 20 with a fastening bracket 22. Further shown are outlet and inlet openings 24 and 26 in the cover 20 as well as a flange 28 for attachment of a (not shown) drive which is connected to a driveshaft 30.



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Rotary expansible chamber devices
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stats Patent Info
Application #
US 20130022487 A1
Publish Date
01/24/2013
Document #
13521878
File Date
01/04/2011
USPTO Class
418146
Other USPTO Classes
418225
International Class
04C2/348
Drawings
8



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