Axial turbine

 

(57) Abstract:

Combined chosen to replace-a guide bearing for the axial turbine contains resistant guide bearing with two bearing surfaces, held in an annular groove of the shaft. Bearing segments each fixed on the radially inner segment of a common carrier beams, which Rethimno attached to podshipnikovaja and enters annular groove. Bearing this design has good access, the segments are made with the ability to easily control and can be easily replaced. 6 C.p. f-crystals, 4 Il.

The invention relates generally to axial turbine, comprising surrounded by the housing of the generator and turbine, which is installed on one common shaft, or the ends of their shafts connected by the coupling, and on the segment of the shaft between the generator and the turbine has a combined chosen to replace-a guide bearing. The invention relates in particular to the combination chosen to replace-guiding bearing for these machines, held by the surrounding of podshipnikovaja, which is fixed to the first bearing segments cooperating with the first cylindrical segment in modestmouse with two axially remote from each other, radially directed line segments of the shaft as the bearing surfaces of the thrust bearing, and means are provided for adjustment of the mutual position of the bearing segments on the said shaft segments.

The invention is based in General, the prior art known, for example, from the prospect - "Bruwn Boveri Mittei lungen" April 1970, T. 57, pages 182 to 190, and in particular Fig. 5 on page 186. More detailed design chosen to replace the combined-guide bearing of this kind is the subject of the international application N WO 90/14523.

The axial generators, also called axial turbine generators, combined chosen to replace-a guide bearing mounted between the turbine and the generator, must take in addition to the own weight of the rotating parts hydraulic thrust, comprising many hundreds of tons. This combined bearing is held surrounding podshipnikovaja, which is fixed to the segments of the thrust bearing, interacting with the two radially directed bearing surfaces on the flange of the shaft as the bearing surfaces of the thrust bearing. On podshipnikovaja also enshrined the radial segments of podshipnikovykh. In addition, all segments correspond to means for regulating their mutual position relative named bearing surfaces of the thrust and radial bearings on the shaft sections (see application N WO 90/14523).

Bearing segments of the thrust bearing on podshipnikopttorg is very difficult, because podshipnikopttorg should cover this flange U-shape. Adjustment and revision of the work necessary to remove difficult part of the casing, in order to get to the adjusting elements of the bearings.

The basis of the invention lies in the task of creating an axial turbine with a combined chosen to replace-guide bearing, which can bear any loads, has a simple structure and provides good access to the bearing segments together with their control elements.

This problem is solved according to the invention by the fact that on the section of the shaft between the turbine and the generator is made annular groove perpendicular to the axis of the shaft bearing surfaces for the bearing, each of the second bearing segments mounted on the radially inner segment of a common carrier beams, which Rethimno fixed on Podshipnik what is that

- mounting and Dismounting of bearing segments can be carried out simply;

as the radial segments, and the segments of the thrust bearings have good access and are made with individual regulation;

maintenance and inspection work can be carried out quickly;

- bearings do not require lubrication when the machine stop;

the elasticity of the thrust bearing is achieved through constructive execution and departure bearing beams, can be a simple way aligned with the overall elasticity of the axial generator.

The invention is explained in more detail below using the drawing.

An example embodiment of the invention schematically shown in the drawing, where

in Fig. 1 in a strongly simplified form shows a longitudinal section of an axial turbine;

Fig. 2 is a more detailed longitudinal section chosen to replace-guide bearing of the generator of Fig. 1;

Fig. 3 is a cross - section of part of the radial guide bearing of the generator of Fig. 2 along the line A-A;

Fig. 4 is a longitudinal section of part of an alternate chosen to replace-guide bearing.

In Fig. 1 in a strongly simplified form shown, an axial turbine, the generator is aznom the casing 1, held under the water by the bottom 2 and top 3 supports. Turbine and generator set in this example, on the same shaft 4. The generator is mounted on the shaft 4 console and consists of a stator 5 and rotor 6. The latter contains the body 7 with the poles (not shown) mounted on the supporting structure 8 of the rotor, which Rethimno enshrined in the area of the hub 9 at the end of the shaft 4. At the other end of the shaft 4 is installed turbine wheel.

Marked POS. 10 combined chosen to replace-the guide bearing is mounted on a segment of the shaft between the generator and the turbine and is retained by podshipnikovaja 11, which casings conical fastener 12 and the radial fastener 13 is fixed by a flange 14 on the inner wall of the casing 1. The bearing is completely enclosed in a compound lining 15, 16, which on the end side of the shaft is type radial gap seals in the grooves 17, 18 of the shaft.

In this regard, the axial turbine is known and, for example, described and depicted in the above publication.

As follows from Fig. 5 of this publication or of the only pieces of the application N WO 90/14523, accessibility to the bearing segments with the purpose of adjusting or servicing is difficult not only covering the guide bearings according to the mentioned application, that is, structures in which the segments of the thrust bearing interact with both lateral surfaces of the shaft shoulder.

To create an axial turbine with combined chosen to replace-guide bearing, which can bear any loads, has a simple structure and provides good access to the bearing segments together with their adjusting elements according to the invention, provides for the implementation on a segment of the shaft between the turbine and the generator of the ring groove 19 is perpendicular to the axis of the shaft bearing surfaces 20, 21 of the bearing. These both bearing surfaces 20, 21 of the bearing segments 22, 23 mounted on the inner end of the radially oriented bearing beams 24. The beams in this example, their twelve - evenly distributed around the circumference (Fig. 3). The beams 24 Rethimno attached to podshipnikovaja 11 threaded his fingers 25, axially completely through podshipnikopttorg 11, and together with a fixed segments 22, 23 are annular groove 19. The device is made in this example so that it is perpendicular to the axis of the shaft 4 mounting surface 26 of podshipnikovaja 11 lies on the same axial height are the texts and extract the screw fingers 25 can radially to pull out and remove.

If perpendicular to the axis of the shaft 4 mounting surface 26 of podshipnikovaja 11 does not lie on the same axial height of the bearing surface 20 of the side wall of the groove 19 as this form of execution shown in the example in Fig. 4, where the same parts are denoted by the same reference position as in Fig. 2 - you should make sure that the radial width b23segments 23 was less than the distance b in the light between the individual ring 32 and the shaft 4. In this condition the carrier beam together with the segments 22, 23 after the weakening and extract the screw fingers 25 you can extend radially outward and then axially and thereby remove.

Bearing segments 22, 23 Rethimno mounted on the carrier beam in a known manner by means axially operating the adjusting means 27 and is well accessible from the outside. The bearing surface 28 on the shaft 4 for segments 29 of the radial bearing of the bearing is directly adjacent to the annular groove 19. The segments 29 Rethimno fixed to the inner periphery of podshipnikovaja 11 with radial operating the adjusting means 30 and, if necessary, spacer plates 31.

Podshipnikopttorg 11 consists of (in OK is that welded between a radially directed, axially passing the ridges 34. To ensure that the clamping forces to the supporting beams 24 are not passed on welds, the design is made so that the holes are axially through jumpers 34 and each individual ring 32, 33 consists of a number of annular segments welded butt joint with the ends of the crosspieces 34. Directed inwardly, axially passing the narrow sides of the jumper at the same time serve for the maintenance and fixing of the segments 29 radial rotor bearing.

The covering on the end chosen to replace-guide bearing of the turbine is made in the form of two or more annular plate parts 16, which enters the groove 18 and is bolted to the end face 35 of podshipnikovaja 11 from the generator. The covering on the end-side of generator is designed as consisting of two or more parts of the box-shaped cover 36 D-shaped section, which Rethimno mounted on the radial fasteners 13. On directed radially inward shelf similar to the end from the generator Rethimno fixed annular plate 37 of the two or more parts, a part of the groove 17. Proper sealing of the bearing between the turbine and the generator are connected in a known manner through contact apartine in Fig. 2 also shows the system of oil supply to the bearing 10. It involves passing the inside of the cover 36 of the ring line 40, from which the inside to the segments 29, 22, 23 were branched lines 41, 42, 43, respectively.

As can be seen from Fig. 2, the design chosen to replace the combined-guide bearing 10 provides the cover 36 unhindered access to its basic parts. Both radial and axial bearing segments are not only clearly visible, and installed with the possibility of regulation, but they can also remove a few hand motions. After removal of the bearing beams 24 should just slip segments 29 of the radial bearing in the direction of the annular grooves 19 and extract them from the annular space between the shaft 4 and podshipnikovaja 11.

Another advantage of the described device in that the axial guide and radial bearing can be made compact without complex chosen to replace-restraints, because they are mounted on a common holding body podshipnikovaja 11. The use of a single retaining body (carrier beam 24) for each of the two segments 22, 23 allows, in addition, by a suitable calculation of the bearing beams, neprimenimosti may be subsequently changed, for example, due to the replacement of other beams.

The bearing design has been described on the example of an axial turbine with generator and turbine mounted on a common shaft 4 and the rotor of the generator is installed console. It can, of course, also be used in installations generator with support from both parties or in installations where the generator and turbine are used through the intermediate shaft, as described in the above-mentioned prospectus.

1. Axial turbine comprising a generator (5, 6, 7), surrounded by a housing or casing (1), and the turbine, which is installed on the same common shaft (4), or the ends of their shafts connected by the coupling, and on the segment of the shaft between the generator and the turbine has a combined nessisarily bearing (10) held its surrounding podshipnikovaja (11), which is fixed to the first bearing segments (29) communicating with the first cylindrical segment (28) of the shaft as the bearing surface of the radial bearing, and two groups of second bearing segments (22, 23), which interact with two axially remote from each other, radially directed line segments of the shaft as the bearing the bearing segments on the said shaft segments, characterized in that on the section of the shaft between the turbine and the generator is made annular groove (19) perpendicular to the axis of the shaft bearing support surfaces (20, 21), while the second bearing segments (22, 23) is fixed on each of the radially inner segment of the overall beam (24), which Rethimno attached to podshipnikovaja (11) and enters an annular groove (19).

2. Installation under item 1, characterized in that podshipnikopttorg consists of two axially remote from each other individual rings (32, 33), which are separated from each other by radially directed, axially passing jumpers (34) and are firmly connected with them.

3. Installation under item 2, characterized in that the beams (24) is fixed on podshipnikovaja (11) threaded fingers (25), which axially passes through the entire podshipnikopttorg (11).

4. Installation under item 1, characterized in that podshipnikopttorg consists of radially directed, axially passing jumpers (34), to both ends of the jumper (34) butt welded passing in the radial direction of the ring segments, and bridges, as well as ring segments form thus podshipnikopttorg (11) in the form of a double ring, etc is odashima via jumper wires (34).

5. Installation on PP.1, 2, or 4, characterized in that the first bearing segments (29) Rethimno attached to the ends of the jumpers (34) through the adjusting means (30, 31).

6. Installation on PP.1 to 5, characterized in that the perpendicular to the axis of the shaft 4 mounting surface (26) of podshipnikovaja (11) lies at the same height with the carrier bearing surface (20) of the side wall of the groove (19).

7. Installation on PP.1 to 5, characterized in that when lying at different axial height of the mounting surface (26) of podshipnikovaja (11) and bearing a bearing surface (20) of the side wall of the groove (19) distance (b) in the light between the shaft (4) and podshipnikovaja (11) is greater than the radial width (b23) adjacent segment (23).

 

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