WO2011069845A2

WO2011069845A2 - Rotary piston or screw rotor as hollow body made from a cold-rolled steel profile

Info

Publication number: WO2011069845A2
Application number: PCT/EP2010/068328
Authority: WO
Inventors: Christian Lahni; Wolfgang Welser
Original assignee: Welser Profile Gmbh
Priority date: 2009-12-10
Filing date: 2010-11-26
Publication date: 2011-06-16
Also published as: WO2011069845A3; DE102009057805A1

Abstract

The invention relates to a rotary piston or screw rotor for high-speed media transport for a compressor or a fan which is rotatably mounted via at least two bearing points (6a, 6b), arranged on the end side of a rotor shaft (5), in a conveyance chamber (2) of a housing (1) having at least one inlet and one outlet connection, wherein there is a hollow rotor body (7) made from a cold-rolled metal plate, the open faces (8a, 8b) thereof being coupled to the rotor shaft (5) via radially extending torque transmission means and, in the end shape, directly interacting via the lateral surface (11) thereof in a dynamically sealing manner with a massive or likewise hollow counter-body (12).

Description

Rotary or screw rotor as a hollow body

from a cold-rolled steel profile

The present invention relates to a rotary or screw rotor for

fast-rotating media transport for a compressor, a pump, a blower or the like, which arranged over at least two end of a rotor shaft

Rotatable bearings in a delivery chamber of at least one supply and a

Drain port having housing is mounted.

Rotors of the subject type are within, for example

Compressors used for compressed air or blowers for air transport, to transport the gaseous medium from an inlet to a drain and possibly compress it. In the context of the present invention, a rotary piston rotor is understood to be a rotor whose lateral surface has projections or depressions running parallel to the main axis. A screw rotor, however, is a rotor in which this

Formations or depressions run helical with high pitch. Both types of rotors are usually dependent on the number of longitudinally extending ones

Moldings designed with multiple leaves and act for fast-rotating media transport with a correspondingly shaped counter body form-fitting non-contacting together. The dynamic sealing takes place only by the small air gap and tight tolerances. Accordingly, a rotary piston or Screw rotor of interest here type as well as their counter body to produce very precise.

From the prior art, it is therefore well known to massively produce such rotary or screw rotors from solid material. These are usually made of forged, hot-rolled, hot-extruded or cast blanks in terms of shape, dimension and tolerance. A particular disadvantage is the high weight and the manufacturing effort.

DE 1 003 471 1 discloses a technical solution in which hollow rotors are used instead of solid rotors. It is proposed to assemble a rotor for a rotary compressor from a plurality of cast parts, which collide in normal planes to the rotor axis, the teeth of the individual castings have open cup-shaped cavities to one side and the castings are lined up on a rotor shaft such that the hollow rotor closed end faces receives. Although this technical solution makes it possible to reduce the weight relative to solid rotors, the process-related production outlay - in particular with regard to casting - appears quite high.

From DE 195 01 514 AI another rotor construction is apparent, although

lighter construction is realized, but is not suitable for the interest here fast-spinning media transport or compression applications. It is proposed to manufacture a rotor for low-speed eccentric pumps, screw pumps or motors by making a tube, which is cylindrical in its original shape, into a helical shape by means of a coiled mandrel or by a coiled die. The rotor produced in this way is detachable but non-twisting with a

Connected drive head and carries inside a cylindrical support body. These

Arrangement is driven by the drive head slowly rotating, the Media transport between the coiled rotor and the support body takes place. As a result, a promotion of viscous or inhomogeneous masses with solid components made in the manner of a screw conveyor.

The idea to use such a coiled rotor as a rotary or screw rotor for fast-moving media transport over the outer Mantelfiäche failed so far on the prejudice of the art that the above-mentioned tolerance conditions with the manufacturing technology of the last-mentioned prior art are not met.

It is the object of the present invention to provide a rotary piston or screw rotor for fast-rotating media transport, the hollow rotor body can be produced with high precision and manufacturing technology simple forming technology.

The object is achieved on the basis of a rotary or screw rotor according to the preamble of claim 1 in conjunction with its characterizing features. The following dependent claims give advantageous developments of the invention or specific applications.

The invention includes the technical teaching that a hollow rotor body is made of a cold-rolled sheet metal whose open end faces are coupled via radially extending torque transmitting means to the rotor shaft, so that forms a closed body, wherein in the final shape over its lateral surface directly sealing hollow rotor body with a solid or hollow

Counter-body cooperates.

The advantage of the solution according to the invention lies in the fact that a particularly lightweight rotary piston or screw motor can be generated, which saves material can be produced. Due to the extreme lightweight construction also less drive energy is required to the rotary piston or screw rotor according to the invention in the desired

to move quickly. Due to the low centrifugal mass at high speeds also act comparatively small forces on the bearing points of the rotor shaft, which can therefore be made smaller. The inventive

Rotary or screw rotor is further characterized by high dynamics, short acceleration times and improved operating characteristics. Because of the at least predominantly Umformtechnischen production by the special manufacturing process of cold rolling arises - if at all - only a slightly zerspannungstechnischer

Production share.

According to a measure which improves the invention, it is provided that the rotor shaft is designed to be subdivided into a first shaft journal and a second journal journal whose respective proximal ends are connected to the end-side edge region of the hollow piston via a driver disk coaxially attached thereto. Thus, the rotor shaft does not need to be carried out continuously, but only in the storage area on both sides of the hollow rotor body. A connection with the hollow rotor body via the

Mitnehmerscheiben, at the same time for torque transmission in the sense of

Functional integration of the hollow rotor body also close the front side, so that it forms an advantageously completely closed volume. Alternatively, the

Rotor shaft nevertheless running consistently and / or formed integrally with the drive plates.

Preferably, the cross-sectional contour in the front-side edge region of the hollow piston should be equal to the cross-sectional contour of the drive plate to be fastened thereto. Because this is the prerequisite for at least partially inserting the drive plate in the respective end regions of the hollow rotor shaft and then preferably sealingly welded. To determine the insertion depth, the drive plate can also with a encircling collar. The sealing welding is preferably carried out by low-distortion hybrid welding process in which material properties, quality and dimensional accuracy are taken into account.

According to a further measure improving the invention, it is proposed that the attachment of the proximal ends of the rotor shaft parts to the drive plate

preferably via screw. Because this makes it possible to replace the rotor shaft parts or the hollow rotor body in case of wear, without the entire existing rotor shaft parts, Mitnehmnerscheiben and hollow rotor body rotor assembly must be replaced. A release lock of the screw connection should, however, be provided. Alternatively, it is also conceivable to perform the joint between the rotor shaft part and drive plate also by welding. All of the aforementioned components are insofar preferably made of a weldable material.

It is conceivable to manufacture the rotor shaft parts designed as shaft journals from a solid profile, in particular by turning from steel. In this case, the shaft journals may have different turned shoulders to form bearing seats for ball bearings or the like. In addition, it is also conceivable that the shaft journals in continuation of the general inventive concept also from a hollow material forming technology or casting technology to produce in order to achieve a further weight saving. Here, however, in particular with regard to the wall thicknesses based on the dynamic load to dimension.

According to another measure improving the invention, it is proposed that the hollow rotor body is at least partially filled with a thermally and / or sound-insulating lightweight building material. By this measure, an efficient resonance tuning of the hollow rotor body with the speed band for the operation can be made to to reduce the noise emission. Furthermore, the filling of the hollow rotor body in the direction of the shaft ends also acts thermally insulating, so that a thermal load is kept away from the bearing points.

If the rotor body has to meet particularly tight tolerances, which are required, for example, in the compressor and blower technology, it is proposed that the previously

final machining by grinding to process the hollow rotor body produced by machining, in order to bring it to the required fit. Because of the quite precise feasible invention essential forming step of cold rolling of the hollow

Rotor body is to cause the final grinding only a small material removal. Thus, a high-precision but hollow rotor body can be manufactured efficiently.

The hollow rotor body according to the invention is particularly suitable for forming a multi-wing screw rotor, a multi-wing rotary piston rotor, a gear rotor or claw rotor. This can be in accordance with well-known Bauprinzipe compressors for compressing gases, blower for conveying gases, with generation of pressure or vacuum to vacuum, but in particular compressed air produced.

Further, measures improving the invention will be described in more detail below together with the description of preferred embodiments of the invention with reference to FIGS. It shows:

Figure 1 is an exploded view of a rotary piston rotor with a hollow

Rotor body

FIG. 2 shows a schematic partial sectional view of the rotary piston rotor according to FIG. 1, FIG. 3 shows a side view of a screw rotor with a hollow rotor body,

4 shows a cross section through a four-wing screw rotor pairing,

5 shows a cross section through a three-wing screw rotor pairing, and

Figure 6 shows a cross section through a three-bladed rotary piston rotor pairing.

According to Figure 1, a rotary piston rotor shown in exploded view is rotatably mounted in a housing 1 only indicated here, wherein a media transport through a

inside delivery chamber 2, starting from an inlet port 3 (suction port) to a drain port 4 (pressure port) takes place. A rotor shaft 5 is rotatably supported by two end-side bearings 6a and 6b relative to the stationary housing 1. A cooperating with a hollow rotor body 7 counter body to achieve the

Media transport effect is obscured in this view.

The hollow rotor body 7 is made of a precision cold-rolled metal sheet. The open end faces 8a and 8b of the hollow rotor body 7 are radially extending torque transmitting means in the form of drive plates 9a and 9b on the

Rotor shaft 5 coupled. The rotor shaft 5 is not designed to be continuous, but consists of a first shaft journal 10a and a second shaft journal 10b, which are each mounted coaxially on their respective associated drive plate 9a and 9b via their proximal ends. The cross-sectional contour in the front edge area of the hollow

Rotor body 7 corresponds to the cross-sectional contour of the thereto to be fastened

Drive plate 9a and 9b, so that they close by sealing the hollow body 7 tightly welded. According to Figure 2, the shaft journals 10a and 10b are designed as solid profiles in this embodiment, which are produced by turning steel. The shaft journals 10a and 10b have several paragraphs for the formation of sealing ring seats, bearing seats and gear seats. The drive plate 9b (exemplary) is inserted in the illustrated mounted position in the end region of the hollow rotor body 7 such that a flush-ended end is achieved. In addition, in this embodiment, the journal 10 b protrudes (by way of example) into the interior of the hollow rotor body 7. The attachment of the aforementioned components together in this embodiment takes place exclusively by welding. The outer surface 11 of the three-winged

Rotary piston rotor is finally ground to fit after forming.

In the figure 3 is shown as a further variant, a screw rotor, which is constructed analogously to the rotary piston rotor described in detail above, but with the

Difference that the hollow rotor body 7 'is provided by forming technology with a screw rotor profile.

According to FIG. 4, a counter-body 12 "cooperates with a four-rotor screw rotor with a hollow rotor body 7", the hollow body of which is likewise produced by cold rolling of metal sheets. The rotor body 7 "as well as its counter body 12" have a direct dynamic sealing over their lateral surfaces 11 "and 13" together.

FIG. 5 shows the variant of a three-wing screw rotor in analog

Cooperation of a hollow rotor body 7 "'with a correspondingly shaped hollow counter body 12'".

FIG. 6 shows, as a further exemplary embodiment, the interaction of a three-winged rotary piston rotor 7 "" with a likewise three-winged counter-body 12 "". shown. The cross section through the profile from the exploded view of FIG. 1 corresponds to the three-winged rotor from FIG. 6.

The interaction of a two-bladed rotary piston rotor with a likewise three-winged counter body is possible. Incidentally, other cross-sectional shapes are conceivable, such as gear rotor profiles or claw rotors, as these already emerge from the general state of the art with regard to the cross section.

LIST OF REFERENCE NUMBERS

casing

delivery chamber

inflow connection

drain connection

rotor shaft

depository

hollow rotor body

front

driver disc

shaft journal

lateral surface

against body

Lateral surface of the counter body

Claims

1. Rotary or screw rotor for fast-rotating media transport for a compressor or a fan, which at least two ends of a rotor shaft (5) arranged bearing points (6a, 6b) rotatably in a delivery chamber (2) of at least one inlet and a drain port having housing (1) is stored,

characterized in that a hollow rotor body (7) made of a cold-rolled

Metal sheet is provided, the open end faces (8a, 8b) are coupled via radially extending torque transmitting means on the rotor shaft (5), and in the final shape over its lateral surface (11) directly dynamically sealing with a solid or hollow counter-body (12) interacts.

2. Rotary or screw rotor according to claim 1,

characterized in that the rotor shaft (5) in a first shaft journal (10a) and a second shaft journal (10b) is executed, whose respective proximal ends via a coaxially attached thereon drive plate (9a, 9b) with the front edge region of the rotor body (7 ) connected is.

3. Rotary or screw rotor according to claim 1,

characterized in that the rotor shaft (5) in a first shaft journal (10a) and drive plate (9a) form a component and the second shaft journal (10b) and the drive plate (9b) form a further component with the front edge region of the rotor body (7 ) are connected.

4. Rotary or screw rotor according to claim 1,

characterized in that the rotor shaft (5) from a continuous shaft with the shaft ends (10a, 10b) which is connected to the drive plates (9a, 9b), which in turn are connected to the front edge region of the rotor body (7).

5. Rotary or screw rotor according to claim 2, characterized in that the internal cross-sectional contour in the end-side edge region of the rotor body (7) is equal to the cross-sectional contour of the drive plate (9a, 9b) to be fastened thereto.

6. Rotary or screw rotor according to claim 2,

characterized in that the frontal connection of the hollow rotor body (7) at the edge region of the drive plate (9a, 9b) is effected by tight axial welding.

7. Rotary or screw rotor according to claim 2,

characterized in that the frontal connection of the hollow rotor body (7) at the edge region of the drive plate (9a, 9b) on the outer cross-sectional contour of the hollow rotor body (7) by tight radial welding.

8. Rotary or screw rotor according to claim 3,

characterized in that the attachment of the proximal ends of the shaft journals (10a, 10b) takes place at the take-away disc (9a, 9b) by welding or screws.

9. rotary or screw rotor according to claim 2,

characterized in that the shaft journals (10a, 10b) are solid profiles and are machined as a plurality of paragraphs having turned steel parts.

10. Drehko Iben- o the S chraubenrotor according to claim 2,

characterized in that the shaft journals (10a, 10b) are Hohlpro file and several paragraphs are made of steel forming technology.

11. Rotary or screw rotor according to claim 1,

characterized in that the hollow rotor body (7) is at least partially filled with a thermally and / or sound-insulating lightweight construction material.

12. Rotary or screw rotor according to claim 1,

characterized in that the hollow rotor body (7) as a mehrflügeliger

Screw rotor, a multi-blade rotary piston rotor, a gear rotor or claw rotor is formed.

13. Rotary or screw rotor according to one of the preceding claims,

characterized in that for the final processing, the rotor shaft (5) and the

Rotor body (7) mantelf on the side are ground to fit.

14. Compressor for compressing gases, in particular air, with a rotary piston or screw rotor according to one of the preceding claims 1 to 13.

15. Blower for conveying gases, in particular air, with a rotary piston or screw rotor according to one of the preceding claims 1 to 13.