DE8236781U1 - SHAFTWAVE IN A FLOWING MACHINE FOR DEEP COLD MEDIA - Google Patents

Description

The innovation relates to a shaft train in a turbo machine for deep kale media, with a shaft part with teeth in the gear area, one an impeller of the turbo-machine bearing shaft part in the cryogenic area and with bearing brackets arranged in a housing and storage.

This generally known prior art is shown in FIG. 1: In the gear housing 1 is a pinion shaft 2, which consists of a shaft part 3 and the toothing 4. As usual with the pinion shaft, the Shaft part 3 and the toothing 4 made from one piece, In the turbo machine processing cryogenic media the impeller is attached to the shaft part 5. The shaft part 5 is connected to the shaft part 3 via a tooth coupling 6 tied together.

Such an arrangement is found, for example, in expansion turbines in refrigeration circuits in gas liquefaction systems or in the liquefaction of natural gas. The power consumption takes place here via gear, mostly by generators, whereby the gearbox plus the turbine form a compact unit. The ones in the turbine and on the

Turbine shaft temperatures are minus
160 ⁰ C and below.

Shaft materials must therefore be used / which
still have sufficient notched impact strength even at low temperatures. Such materials, however, are not suitable as toothing materials.

In the known system shown in FIG. 1, the turbomachine area and the gear area are thus
separated so that the optimal materials can be used in each part. This is done in such a way that the turbomachine has its own bearing bracket and is flanged to the gear housing 1. According to FIG. 1 it can be seen that the connection of the shaft part 3 to the toothing 4 takes place via the toothed coupling 6 with the shaft part 5.

The disadvantage here is the very high design
Effort, on the other hand, the considerable space required, as can be clearly seen from FIG. 1.

The present innovation is based on the task of designing a shaft train for the arrangements mentioned at the beginning in such a way that the impeller for cryogenic media is directly on
can be attached to the shaft train and thus a simple and space-saving structure is achieved.

This object is achieved according to the invention in that the shaft train is formed in one piece with the two shaft parts and that the two shaft parts are connected to one another by welding. This has the advantage of that the optimal materials can be used for each of the two tvelleteile, whereby as a result of the welded connection nevertheless a simple and space-saving structure is given. The bearing bracket for the turbomachine and

if. - 5 -

■% the impeller bearings are omitted; a tooth clutch is no longer

r, required; when using pressure comb gears can

the axial bearing, which fixes the position of the pinion shaft and thus also the impellers, on the slow-running _{counter gear shaft, J 5} , which meshes with the pinion shaft

% are ordered; this results in efficiency improvements

jf serungen and the oil plant is being downsized. The entire

ί location becomes more compact, space-saving and has a lower

% Weight on.

; i In a further development of the innovation, the shaft part

I in the cryogenic area made of soft martensitic material

; f and the shaft part in the gear area is made of gearing

* consist of fabric. In any case, this will correspond to the

ί: Purpose of application optimal materials for the two shaft

; parts used.

jj Another feature of the innovation is the two

| j shaft parts of the one-piece shaft train

l · only supported by two bearings in the gearbox housing, whereby

f. advantageously those in the known prior art

5 required bearing brackets of the turbomachine are omitted.

_{; <} In a further development of the innovation, the impeller

§ have a shaft part which is directly connected to the

Sj toothing bearing shaft part is welded. This

I is a particularly simple embodiment, which

I especially for production in larger numbers of pre-

If part is.

According to another feature of the innovation can be called sweat-I connection electron beam welding, friction welding or

I laser beam welding can be used.

The innovation is described in more detail below with reference to the exemplary embodiments shown in the drawing. In the drawing show:

Fig. 2 is a side view of a system in

Middle cut;

3 shows another embodiment of the system,

also in the middle cut.

According to FIG. 2, a shaft train 2 'is arranged within a transmission housing 1. This shaft strand 2 'consists from the wedge part 5 'and the shaft part 3'. The shaft part 5 'here carries the impeller 7 and consists of soft martensitic Material - is therefore well suited for very low temperatures.

The shaft part 3 'consists of toothing material and carries the toothing 4, which works together with counter gears not shown in detail ► The two shaft parts 3' and 5 'are connected to one another by welding via a seam 9. Electron beam welding, friction welding or laser beam welding can be used as the welding form. Thus, the shaft train 2 ¹ is formed in one piece. It is stored in the bearings 10 and 11 in the gear housing 1, whereby the impeller 7 is brought very close to this housing; This results in a space-saving arrangement, and in addition the bearing brackets shown in FIG. 1 with the bearings 8 according to the known prior art can be dispensed with.

The insulation measures to prevent the cold flow are not shown from the cryogenic medium to the adjacent components.

Due to the one-piece design of the \ vellenstrang 2 'with the two shaft parts 5 'and 3', each made of the optimal materials, create a compact arrangement, which is both weight and space-saving and has a very simple design.

In the exemplary embodiment according to FIG. 3, the impeller 7 has a one-piece shaft part T , which in turn is welded to the shaft part 2 ¹ , which carries the toothing 4, via a weld 9. The impeller 7 is thus welded directly to the pinion part. ^{The shaft 5 1} shown in FIG. 2 can thus be omitted, so that a very simple design results.

In any case, the shaft strand 2 ^{1 is formed in one} piece with the two shaft parts, these two shaft parts being connected to one another by appropriate welding via the seam 9. In the embodiment according to FIG. 3, the shaft part 2 ^{1 can} also have a projection on the area adjoining the shaft part 7 ″, which cooperates with a corresponding counter-construction of the shaft part 7 ^{1 in} order to ensure that the impeller 7 is securely held and connected by welding to the Wave part 2 ¹ to convey.

Patent attorneys Dipl.-Ing. E. Eder Dipl.-ing. K.Schieechke

8000 Munich 40, Elisabethstr. 34

Claims (6)

Patent Attorneys Dip! .- Ing. E. Ector Dipl.-Ing. K. Schieschke SOOO Munich 40, EJlsabethstr. 34 File number: G 82 36 781.7 Applicant: BHS-Bayerische Berg-, Hütten- und Salzwerke Aktiengesellschaft Munich Wave line in a flow machine for cryogenic media. Protection claims 1. Shaft train in a turbo machine for cryogenic media, with a shaft part with teeth ± m gear area, a shaft part carrying an impeller of the turbo machine in the tiel..old area and with bearing supports and bearings arranged in a housing, characterized in that the shaft train (2 ") is formed in one piece with the two shaft parts and that the two shaft parts (3 ¹ , 5"; 3 ¹ , 7 ") are connected to one another by welding (9). 2. wave train according to claim 1, characterized in that the shaft part (5 ') in the cryogenic area of soft martensitic Material. 3. A shaft train according to claim 1 and 2, characterized in that the shaft part (3 ¹ ) consists in the gear area of VerzahmingswerJ-material. 4. Shaft assembly according to claim 1, characterized in that the two ^{shaft parts 3 1} , 5 ') of the one-piece shaft assembly (2) are mounted only via two bearings (1O, 11) in bearing brackets of the gear housing (1) " 5. A shaft train according to claim 1 / characterized in that the impeller (7) has a shaft part (7 ¹ ) which is welded directly to the shaft part (3) carrying the toothing (4). 6. shaft assembly according to one of the preceding claims, characterized in that electron beam welding as a welded connection, Friction welding or laser beam welding are used. Patent attorneys Dipl.-Ing. EL Ector Dipl.-Ing. K.Schieechke 8000 MDnchen 40, Ellsabettistr. 34