WO1999048612A1

WO1999048612A1 - Solid bowl helical conveyor centrifuge with an overmounted planetary gear system

Info

Publication number: WO1999048612A1
Application number: PCT/EP1999/000073
Authority: WO
Inventors: Paul BRÜNING
Original assignee: Westfalia Separator Ag
Priority date: 1998-03-21
Filing date: 1999-01-08
Publication date: 1999-09-30
Also published as: DE19812484C1

Abstract

The invention relates to a solid bowl helical conveyor centrifuge with an overmounted planetary gear system. The aim is to increase the critical speed of said centrifuge or the operating speed by reducing the mass action of the planetary gear system. A disk-shaped gyroscope (10) whose point of articulation (G) lies in the point of intersection of the middle axis (3) of the helical conveyor centrifuge and the vertical plane (11) of the gear-end drum mounting (5) is fixed to the housing of the planetary gear system (2). The invention is suitable for use in solid bowl helical conveyor centrifuges with overmounted planetary gear systems.

Description

Solid bowl screw centrifuge with overhung planetary gear

The invention relates to a solid-bowl screw centrifuge with a drivable drum which is mounted on the two end faces and can be rotated about a horizontal axis, and a co-screw which is rotatably mounted therein and which can be driven with a differential speed relative to the drum, the drive having a floating gear mechanism, whose housing shell is connected to the drum and its output shaft to the screw conveyor.

A solid bowl screw centrifuge of this type is known from US Pat. No. 5,403,260. With these screw centrifuges, the critical speed and thus also the operating speed are significantly influenced by the mass effect of the over-the-counter gear.

The invention has the object to make a solid-bowl screw centrifuge of the aforementioned type so that the mass effect of the flowing ^¬ is reduced quietly mounted planetary gear system and the operating speed of the screw centrifuge can be increased.

This object is inventively achieved in that a disc-shaped centrifugal fixed to the casing of the planetary gear, the fixed point (pivot point) G fuge at the intersection between the center axis of the Schneckenzentri ^¬ and the vertical plane of the adjacent epicyclic gear bearing of the drum is located.

As centrifugal generally means each rotatable, rigid body which is retained in egg ^¬ nem point.

Due to the disk forming the gyroscope, which is connected to the revolving housing of the epicyclic gear, the mass effect of the epicyclic gear is considerably reduced if the position of the common center of gravity is brought closer to the bearing point. The reduction of mass action is all the greater, the greater the ratio R / LSG _* ^is ^{wherein R s} disc outer radius and ISG is ^the distance of the wheel center of gravity S of the pivot point G. The mass effect of the disk acting as a gyroscope can assume a negative value, so that part of the mass effect of the epicyclic gear is thus compensated.

In an advantageous embodiment, the disk forming the gyroscope has an annular flange on the outside, which extends in the direction of the vertical plane of the bearing of the drum or beyond the vertical plane of the bearing of the drum. This brings the center of gravity of the disk forming the gyroscope close to the bearing point, which results in a large value for R / ISG.

Further features of the invention emerge from the patent claims.

The invention is described below with reference to the drawings.

Show it:

Figure 1 is a solid bowl screw centrifuge with overhung

Planetary gear in a schematic representation,

Figure 2 is a floating gearbox with associated one

Disk forming a gyroscope and a bearing of the drum in longitudinal section,

Figure 3 is a schematic representation of a gyro acting

Disc in section with its outer radius R, the center of gravity S, the pivot point G and the distance between the

Center of gravity and the hinge point 1 / sG _* where the disk has the mass m, and a line runs from the hinge point G at the angle a to the outer radius R of the disk, and

Figure 4 is a representation corresponding to FIG. 2 with several α extending from the hinge point G at different angles

Lines that are assigned to disks with different outer radius R.

In the Fig. 1, a solid-bowl screw centrifuge 1 with a floating gear mechanism 2 is shown schematically. The worm centrifuge has a drivable about a horizontal axis 3 and a drum 4 rotatably coaxially therein ^¬ bar mounted, drivable at a differential speed with respect to the drum 4, not shown, screw conveyor on. The drum is supported on the Stirnsei ^¬ th in bearings from 5.6, wherein by the transmission-side drum bearings 5 a hub 7 of the rotating housing 8 of the epicyclic gear 2 during operation, which is connected to the drum shell. An output shaft 9, which forms the drive shaft for the screw conveyor, also extends through the interior of the drum bearing 5.

On the housing 8 of the epicyclic gear 2, a disk-shaped gyro 10 is attached, the fixed point (articulation point) G of which lies at the intersection between the central axis 3 of the screw centrifuge and the vertical plane 11 of the gear-side drum bearing 5.

The structural design of an embodiment of the disc forming the gyro 10 and its attachment to the housing 8 of the epicyclic gear 2 is shown in FIG. 2.

The disc 1 0 is attached to the housing 8 of the epicyclic gear by means of screws 1 2. The disc 1 0 has stepped ring surfaces 1 3, 1 4 and 1 5, to which correspondingly stepped ring surfaces of the disc-shaped housing part 1 6 of the epicyclic gear 2 are assigned. The ring surfaces 1 3 and 1 5 are supported on the associated ring surfaces of the housing part 1 6, while between the ring surface 1 4 and the associated ring surface of the housing part 1 6 there is play. The disc-shaped housing part 1 6 is mounted on the output shaft 9 of the epicyclic gear 2 via a roller bearing 17.

The disk 1 0 forming the gyroscope has a hub 1 8 which extends through the gear-side drum bearing 5 and is connected to the drum 4.

In the illustrated embodiment according to FIGS. 1 and 2, the disc forming the gyro 1 0 is provided on the outside with a ring 1 9, which extends in the direction of the vertical plane 1 1 of the drum bearing 5 and, in the exemplary embodiment shown, projects above the plane 1 1 towards the drum side.

As a result, the center of gravity S of the disk 10 forming the gyro is shifted in the ^{direction of} the articulation point G, as a result of which the mass effect of the epicyclic gear is reduced.

The mass effect of a flying disc is reduced by rotation

the factor JG - * R

• G disc.

The factor can be calculated using the following relationships: OG) disc = Q) disc + m ' ² SG moment of inertia of the disc around G at standstill

ol disc = ^m B-: 4

Moment of inertia about a transverse axis through S

('R) disc = ^m B! 2 moment of inertia around the axis of rotation.

- -1 -0.5 0 G IR \ 0.2 0.4 0.6 0.8

(-G / disc

90 ° 74 ° 63.4 ° 58.5 ° 52.6 45 ° 33.7 ° α 0

00 3.46 2 1, 63 1, 31 1 0.67

R -SG

For all discs with an outer radius R determined by a line 'R = const

> G / disk the mass effect during rotation is reduced by the same factor.

The greater the ratio R / ISG _* ^st (R disc outer radius; LSG, distance of the center of gravity S from the center of the point G, the greater the reduction in the mass effect.

The mass effect is less than zero for panes with R / ISG> 2. Such discs can be used to support discs with R / ISG <2. Reference list

1 solid bowl screw centrifuge

2 planetary gears

3 axis

4 drum

5 bearings

6 bearings

7 hub

8 housing

9 output shaft

10 gyros

11 level

12 screw

13 ring surface

14 ring surface

15 ring surface

16 housing part

17 rolling bearings

18 hub

19 ring

Claims

claims

1 . Solid-bowl screw centrifuge with a drivable drum mounted on the two end faces, rotatable about a horizontal axis, and a co-screw rotatably mounted therein, which can be driven with a differential speed relative to the drum, the drive having a cantilever-mounted planetary gear, the casing of which is connected to the Drum and its output shaft is connected to the screw conveyor, characterized in that on the housing (8) of the epicyclic gear (2) a disk-shaped gyroscope (1 0) is fixed, the fixed point (pivot point) G at the intersection between the central axis (3) of the

Screw centrifuge and the vertical plane of the gear-side drum bearing (5).

2. Solid bowl screw centrifuge according to claim 1, characterized in that the disc forming the gyroscope (1 0) is provided with a through the gear-side drum bearing (5), with the drum (4) connected hub (1 8) .

3. Solid bowl screw centrifuge according to claim 2, characterized in that the disc (1 0) with stepped ring surfaces (1 3, 1 5) on stepped ring surfaces of a disc-shaped housing part (1 6) of the epicyclic gear (2) is supported.

4. Solid bowl screw centrifuge according to one of claims 1 to 3, characterized in that the disc (10) forming the gyroscope is screwed to the housing (8) of the epicyclic gear (2).

5. Solid bowl screw centrifuge according to one of claims 1 to 4, characterized in that the disc forming the gyroscope (1 0) has an outside ring (1 9), which is in the direction of the vertical plane (1 1) of the drum bearing (5) extends.

6. A solid-bowl screw centrifuge according to claim 5, characterized in ^¬ net, that the ring (1 9) projects beyond the perpendicular plane (1 1) in the direction of the drum (4). Solid-bowl screw centrifuge according to one of Claims 1 to 6, characterized in that, in order to reduce the mass effect of the epicyclic gear, the ratio R / ISG ( ^R = outer disc radius, ISG = distance of the center of gravity S from the point G) is> 2.