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Rotating-slide vacuum pump or compressor of block design having a disc-rotor synchronous motor which is mounted on flying bearings

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Title: Rotating-slide vacuum pump or compressor of block design having a disc-rotor synchronous motor which is mounted on flying bearings.
Abstract: In a rotating-slide vacuum pump or compressor having a rotor (6) which can rotate in a housing (2) and is driven by a drive shaft, and having slides (8) which can be moved outwards in the circumferential direction herein in slots (7) in the rotor (6) and separate individual feed chambers of a working area (9), which is provided with an intake opening (1) and an outlet opening, from one another, and each assume a maximum outer position adjacent to the housing inner wall, driven by centrifugal force, the arrangement is designed such that a brushless disc-rotor synchronous motor (11, 12) is fitted in the axial direction to the rotor shaft. ...


USPTO Applicaton #: #20090324433 - Class: 4174103 (USPTO) - 12/31/09 - Class 417 
Pumps > Motor Driven >Electric Or Magnetic Motor >Rotary Expansible Chamber Pump

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The Patent Description & Claims data below is from USPTO Patent Application 20090324433, Rotating-slide vacuum pump or compressor of block design having a disc-rotor synchronous motor which is mounted on flying bearings.

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This application is a National Stage filing under 35 U.S.C. § 371 of PCT Application No. PCT/EP2007/007151 filed Aug. 13, 2007, which claims priority from German Application No. DE 10 2006 039 958.7 filed Aug. 25, 2006.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to rotating slide vacuum pumps and compressors as claimed in the precharacterizing clause of claim 1.

2. Description of Related Art

The invention may relate both to rotating slide vacuum pumps and compressors which are lubricated by oil circulation and to those which run dry. These pumps and compressors are normally designed to be horizontal, with the slides, which can move in the rotor, in the case of dry-running rotating slide vacuum pumps and compressors normally being composed of graphite or graphite composite materials while, in the case of rotating slide vacuum pumps and compressors which are lubricated by oil circulation, the slides may also be composed of plastic or plastic composite materials.

Rotating slide vacuum pumps and compressors which are lubricated by oil circulation and which are of block design, that is to say with a rotor which is mounted on flying bearings, are normally operated with single-phase alternating-current motors or three-phase asynchronous motors. Pumps and compressors such as these have been successfully used for decades and are subject to severe competition in the widely differing markets.

Single-shaft rotating slide vacuum pumps and compressors which are lubricated by oil circulation are of block design only for low feed rates, that is to say from about 2 m3/h to a maximum of 100 m3/h. Above these feed rates, the surface area of the pumps and compressors is no longer adequate for thermal emission of the compression heat. Larger vacuum pumps and compressors are therefore designed primarily in a conventional manner with a coupling between the drive motor and the pump or compressor stage.

Prior art throughout the world is the use of alternating-current or three-phase drives which, because of the small gaps that are required between the rotor and the cylindrical housing which is permanently fitted on the drive-end bearing plate of the motor, requires comparatively complex fine tuning of the motor bearing. The drive motors, particularly in the case of high-quality vacuum pumps and compressors, are therefore subject not only to the described fine tuning but, furthermore, they must comply with the required accuracies with the quality remaining unchanged. This results in high costs and a restricted provider market for motors such as these.

Furthermore, particularly in the power range from 80 W to 2 kW that is used here, the relatively low efficiency of alternating-current drives and of three-phase drives not only results in a noticeably larger physical volume but, in addition, the feasible physical space cannot be optimally utilized because of the need for an elongated physical shape.

The described rotating slide vacuum pumps and compressors which are lubricated by oil circulation and are of block design can in principle be subdivided into two further variants, specifically,

1) rotating slide vacuum pumps and compressors which are lubricated by oil circulation and with an oil mist separator arranged at the side of the pump/compressor stage and motor. Owing to the larger external surface area, this embodiment can be used for all physical sizes, that is to say from about 2 m3/h up to a maximum of 100 m3/h. Furthermore, the oil mist separator can use all its external surfaces, except for the inner area of the gas inlet flange to the pump/compressor stage, for heat emission to the outside, and

2) rotating slide vacuum pumps and compressors which are lubricated by oil circulation and have an oil mist separator which is arranged axially with respect to the pump/compressor stage. In the case of this design, one of the axial housing covers is the drive-end motor plate itself, while the other axial housing cover is connected directly to the oil mist separator, as a result of which the drive motor, the pump/compressor stage and the oil mist separator are arranged directly adjacent to one another axially. However, this means that one of the major outer surfaces is not available to the oil mist separator and/or to the pump/compressor stage for heat emission. For this reason, and because this embodiment also has an excessive ratio of length (at its axial extent) to width of the base area, for many applications, machines such as these are produced primarily only in sizes from about 2 m3/h up to a maximum of 12 m3/h.

In the case of small rotating slide vacuum pumps and compressors which are lubricated by oil circulation, one problem that frequently occurs even during production is that, as a consequence of the flying bearings of the rotor, the gaps (of between 0.02 and 0.04 mm) which are narrow and the relatively high radial forces on the rotor during test running, noise is produced which may also be caused, inter alia, by touching between the stationary housing and the rotor, and this noise is unacceptable for the user.

The invention is therefore based on the object of designing rotating slide vacuum pumps and compressors of this generic type in order to overcome the described disadvantages, such that the overall physical size of the machine is minimized, the process reliability during production is increased and, at the same time, the assembly of the machine is lastingly simplified.

SUMMARY

OF THE INVENTION

The features of the invention which is being created in order to solve this problem result from claim 1. Advantageous refinements are described in the further claims.

Bearing in mind the problems and deficiencies of the prior art, it is therefore an object of the present invention to provide a rotating slide vacuum pump lubricated by oil circulation and having a block design, with a disk-rotor synchronous motor, which is mounted on flying bearings.

The present invention is directed to, in a first aspect, a rotating slide vacuum pump or compressor including a rotor, which can rotate in a housing and is driven by a drive shaft, and slides which can be moved outward in the circumferential direction herein in slots in the rotor, which separate individual feed chambers of a working area, which is provided with an induction opening and an outlet opening, from one another and, driven by centrifugal force, each occupy a maximum outer position on the housing inner wall, comprising a brushless disk-rotor synchronous motor which is fitted in the axial direction on the rotor shaft, wherein thermal isolation is incorporated in the form of a housing constriction between the pump/compressor stage and the disk-rotor synchronous motor or is provided by the housing shape itself.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the invention believed to be novel and the elements characteristic of the invention are set forth with particularity in the appended claims. The figures are for illustration purposes only and are not drawn to scale. The invention will be explained in more detail in the following text with reference to the drawing, in which:

FIG. 1 shows a rotating slide vacuum pump which is designed according to the invention, is lubricated by oil circulation and has a block design, with a disk-rotor synchronous motor, which is mounted on flying bearings, schematically in the form of a longitudinal section, and

FIG. 2 shows a cross section along the line II-II in FIG. 1.



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stats Patent Info
Application #
US 20090324433 A1
Publish Date
12/31/2009
Document #
12438898
File Date
08/13/2007
USPTO Class
4174103
Other USPTO Classes
418 88
International Class
/
Drawings
3


Bearing
Brush
Centrifugal Force
Compressor
Drive Shaft
Motor
Outlet
Pressor
Rotate
Rotor
Synchronous
Vacuum
Vacuum Pump


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