DE19616243A1 - Turboset bearing ring - Google Patents

Abstract

The sealing ring is sealed by means of radial pins and is made up of radially movable segments (4) supported by compressing on springs (10) employs its thread resembling sealing tips (9) to cooperate with the shaft (12) and make a minimal sealing gap (13) which remains unchanged throughout turbo-set operation. Also includes top and bottom bearing section ring parts (1a,b) confining a chamber (3) with the bottom parts. The segments and their sealing pins and screws are integrated in the chamber and the ring halves screwed right home by hexagon screws (7,8). The load springs (10) urge the segments onto surfaces (11) to afford the sealing gap.

Description

The invention relates to an insert ring with elastic sealing segments for the bearing housing of Turbo machines, to increase the oil sealing effect at the breakthrough points of the shafts.

In turbomachinery, there are a variety of non-contact and elastic seals constructions for the blading, the inner and outer shaft seals as well as the housings Insert rings to improve efficiency by minimizing and keeping them largely constant the gap between the stationary and rotating components of the machine as far as possible all operating phases known.

There are usually several in the various insert ring designs for the bearing housings Semi-ring sealing plates, preferably made of brass, are caulked into the insert ring halves and form a rigid radial seal with the shaft and special splash rings.

The disadvantage of this known solution is that when it is touched for operational reasons play on the fixed sealing rings due to local wear of the tips be enlarged, which reduces the oil sealing effect and the occurrence of oil leaks there is an increased risk of fire on the hot turbine components. Oil leaks in the area of the From an electrical point of view, inductors are also undesirable.

The aim of the invention is to develop an insert ring for bearing housings of turbomachinery, which by radial mobility of sealing segments with sealed segment joints and special sealing tip design when the shaft can be touched an immediate, significant one Avoids wear and thus reliably secures the oil sealing effect over a long period of time.

The invention has for its object a insert ring with spring-loaded sealing segments for To design bearing housings of turbomachinery with which the permanent named in the target Ensuring the oil sealing effect through the functional design of constant sealing gaps with radially resilient, axially sealed and spring-supported segments on all dynamically induced changes in the shaft position is made possible.

According to the invention the object is achieved in that the previously rigidly in the bearing insert ring stemmed sealing sheets (brass sheets) are replaced by new sealing components.

In this construction, the radial movement of the sealing segments causes damage to the possible rubbing of the shaft on the tips of the sealing segments and thereby caused in the Resulting oil leaks largely avoided. The sealing segments are by springs pressed on the bearing shoulders of the bearing insert ring and give way when brushing the shaft radial out. The springs mounted with a low preload cause only low normal forces, so that the wear of the sealing tips remains low.

In addition, the sealing tips of the segments are thread-shaped, so that according to the principle the single-spindle screw pump creates a pumping action that counteracts the leakage current flow is. The direction of the slope depends on the direction of the leakage current and the Direction of rotation of the shaft fixed.

The invention is explained in more detail below using an exemplary embodiment.

The drawing shows:

Figure 1 shows the partial cross section of the bearing insert ring.

Fig. 2 is a partial cross-section in the partial joint areas;

Fig. 3 is the view of the segment shocks;

Fig. 4 shows the section through the radial pin with attachment.

In the ring halves 1 a (upper part) and 1 b (lower part) and 2 a and 2 b of the illustrated bearing insert ring of conventional design, which delimit the intermediate chamber 3 , the radially movable sealing segments 4 in combination with the radial pins 5 and the fastening screws 6 integrated. The A ring halves 2 a and 2 b are axially positively connected by means of hexagon screws 7 , the ring halves 1 a and 1 b are screwed oil-tight with socket head screws 8 . The sealing tips 9 of the sealing segments 4 are thread-like (right-hand or left-hand thread). The Dichtseg elements 4 are pressed by the compression springs 10 (2 springs per segment) with an operationally appropriate pressure against the bearing surfaces 11 and form a sealing gap 13 ("s") with the shaft 12 (diameter "d"). The return of the leak oil from the inter mediate chamber 3 in the bearing housing takes place via a bore 14 of the lower ring halves 1 b and 2 b in the intermediate chamber 3rd The ring halves 1 a and 1 b are screwed ben in the joint plane with the cylinder head screws with hexagon socket 16 . Fig. 4 shows by means of the radial pins 5 and with movement game overlapped segment joints.

The manufacturing technology provides that the fitted and fastened radial pins have a length up to the machining pre-rotation dimension of the thread seal and thus there are no permanent axial gaps and the oil tightness is ensured for all position positions. In Fig. 3 the arrangement of the fastening screw 6 for the Radalstift 5 can be seen . The known assembly securing of the segments in the parting area is not shown in the figures.

The structural arrangement of the splash rings 17 takes place in dependence on the thermal expansion ratios of the shafts at the sealing points of the bearing housing. Compression spring design, games and passages of the construction correspond to the usual empirical values and the experimentally determined characteristics of the elastic and non-contact sealing systems of known turbine flow parts.

Reference list

1 a, 2 a upper part of bearing insert ring
1 b, 2 b lower part of bearing insert ring
3 intermediate chamber
4 sealing segments
5 radial pins
6 fastening screws
7 hexagon screws
8 socket head screws with hexagon socket
9 tips of the sealing segments
10 compression springs
11 contact surfaces
12 wave
13 sealing gap
14 hole
15 hole
16 socket head screws with hexagon socket
17 splash rings.

Claims (1)

Insert ring of bearing housings of a known type for turbomachinery, characterized in that a sealing ring constructed from radially movable sealing segments ( 4 ) supported by compression springs ( 10 ) and sealed at the segment joints by means of radial pins ( 5 ) with thread-like sealing tips ( 9 ) in cooperation with the Shaft ( 12 ) forms a minimal, and largely constant during operation of the turbo rate, sealing gap ( 13 ).