EP2216513A1 - Valve connection to a triple shell turbomachine - Google Patents

Abstract

The turbo-machine has a valve comprising a valve diffuser (4) and a valve housing (7) that is connected with an outer housing (1) by a valve flange. An internal interior housing (3) is connected with the valve diffuser by an angle ring connection (8), and an external interior housing (2) is connected with the valve diffuser by another angle ring connection (9). The internal interior housing comprises an angle ring (14) that is arranged in an interior housing angle ring groove (15). The latter angle ring connection comprises another angle ring (21).

Description

The invention relates to a turbomachine with a valve, wherein the turbomachine comprises an inner inner housing, an outer inner housing and an outer housing, wherein the valve comprises a valve diffuser and a valve housing, wherein the valve housing is connected via a valve flange to the outer housing, wherein the inner inner housing is connected via a first angle ring connection with the valve diffuser.

Two-shell steam turbines are known. In a double-shell steam turbine, the inner casing is arranged around the rotor and the outer casing around the inner casing. As a result of temperature changes, it may cause movements of the inner housing relative to the valve. The valve essentially comprises a valve housing and a valve diffuser arranged in the valve. The valve diffuser is usually designed for guiding the flow medium. If the valve diffuser and the inner housing were rigidly coupled together by means of frictional connections, this would lead to stresses and possibly to deformations that are undesirable. Therefore, so-called. Angular ring connections are used. In this case, the valve diffuser and the inner housing each have a groove in which an angle ring is arranged. This results in that a thermal movement can be compensated in both an axial and in a radial direction.

In the case of three-shell steam turbines, a further inner housing is now additionally added between the inner inner housing and the outer housing, which can be referred to as the outer inner housing. The outer inner housing also performs as a result of thermal changes from a thermal movement, which may possibly interfere with the valve diffuser. Another requirement is that the space between the Inner inner housing and the outer inner housing and the outer inner housing and the outer housing should be sealed. Nevertheless, mechanical stresses due to thermal movements should be avoided.

It would be desirable to have a structurally simple way to be able to connect the outer inner housing to the valve diffuser.

It is an object of the invention to provide a simple way to couple the outer inner housing to the valve diffuser.

This object is achieved by a turbomachine with a valve, wherein the turbomachine comprises an inner inner housing, an outer inner housing and an outer housing, wherein the valve comprises a valve diffuser and a valve housing, wherein the valve housing is connected via a valve flange with the outer housing, wherein the inner inner housing is connected via a first angular ring connection with the valve diffuser, wherein the outer inner housing is connected via a second angular ring connection with the valve diffuser.

Thus, with the invention, the way is taken to use an angle ring connection to couple the outer inner housing to the valve diffuser. With the angle ring connection, it is possible to compensate for thermal movements both in the direction in which the valve diffuser is elongated, as well as perpendicular thereto. Advantageous developments are specified in the subclaims.

In a first advantageous development, the inner inner housing has a first angular ring arranged in an inner housing angular ring groove. The inner housing angular ring groove and the first angular ring disposed therein are made such that movement of the first angular ring in the inner housing angular ring groove is possible. In addition, should the movement will not be restricted as a result of temperature changes. For this, the material of the first angle ring and the inner inner housing should be chosen appropriately. On the other hand, the tolerances and materials must be selected such that high temperature, high pressure steam can not flow between the first angle ring and the inner casing angular ring groove.

In a further advantageous development, the second angle ring connection comprises a second angle ring, which is arranged in a second valve diffuser angle annular groove formed in the valve diffuser. The second angle ring and the second valve diffuser angle annular groove are also formed of materials that allow a thermal movement without causing the seal to wear. The tolerances and materials must be selected accordingly.

The outer casing is arranged around the outer inner casing. In addition, the outer inner casing is arranged around the inner inner casing.

In an advantageous development, the valve diffuser is designed for the flow of flow medium in a flow direction, wherein the inner housing angular ring groove is formed substantially parallel to the flow direction. Flow medium may in this case be, for example, a vapor, in particular water vapor with high temperatures and high pressures. Since the valve diffuser is substantially elongate and resembles a tube in its appearance, the thermal expansion is to be expected substantially in the longitudinal training. Therefore, a seal that is movable in the flow direction is desirable. According to the invention, the Innengehäuswinkinkelringnut is formed parallel to the flow direction to ensure a good thermal movement in the direction of flow.

In an advantageous development, the second valve diffuser angle annular groove is substantially perpendicular to the flow direction educated. In the case of the thermal expansion of the outer inner housing, essentially a movement perpendicular to the flow direction at the point of contact between the valve diffuser and the outer inner housing is to be expected. A good heat radiating angular ring assembly at this point would be desirable. By arranged substantially perpendicular to the flow direction second Ventilildiffusorwinkelringnut a good thermal mobility is ensured perpendicular to the flow direction.

In a further advantageous embodiment, an intermediate ring is arranged non-positively on the outer inner housing, wherein the intermediate ring is formed a second Zwischenringnut for receiving the second angle ring. The intermediate ring is an additional component which is frictionally arranged, for example via stud bolts with capsule nuts on the outer inner housing. However, by choosing the material and the manufacturing tolerances selected, an optimum constructive solution can be offered to offset the thermal movements of the valve diffuser and the inner inner housing. In a further advantageous development, the intermediate ring has a first intermediate ring groove for receiving the first angle ring.

In a further advantageous development, the first angle ring connection has a first and a second angle ring leg, the first angle ring leg being arranged in the inner casing angular ring groove and the second angle ring leg being arranged in a first valve diffuser groove or intermediate ring groove arranged in the valve diffuser or in the angle ring.

In a further advantageous development, the first intermediate ring groove and the second intermediate ring groove are arranged substantially perpendicular to one another. This ensures a very good mobility both in the flow direction and perpendicular to the flow direction.

Embodiments of the invention are described below with reference to the drawings. These are not intended to illustrate the embodiment to scale, but is shown what explanations serve in a schematic and / or slightly offset form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art.

In the different figures, the same parts are always provided with the same reference numerals, so that these are usually described only once.

Show it

FIG. 1

a cross-sectional view of a part of a three-shell turbomachine;

FIG. 2

a cross-sectional view of a portion of a three-shell turbomachine in an alternative embodiment;

FIG. 3

a cross-section of a portion of a three-bladed steam turbine in an alternative embodiment.

The FIG. 1 shows in cross section, a part of a three-shell turbomachine. The turbomachine may be, for example, a steam turbine. The steam turbine comprises an outer housing 1, an outer inner housing 2 and an inner inner housing 3. For clarity, no rotor is shown. The rotor is rotatably mounted about a rotation axis perpendicular to the plane of the drawing. The inner inner casing 3 is arranged around the rotor. The outer inner casing 2 is disposed substantially around the inner inner casing 3. The outer casing is finally arranged around the outer inner casing 2 and the inner inner casing 3.

In operation, steam flows in a valve diffuser 4 in a flow direction 5 into an inflow region 6 of the steam turbine. The steam is flowed through a not-shown valve in the inflow 6. The valve substantially comprises the valve diffuser 4 and a valve housing 7. The inner inner housing 3 comprises a first angle ring connection 8, which makes it possible to heat-couple the inner inner housing 3 with the valve diffuser 4. The purpose of the first angle ring connection 8 is to allow an effective seal between the inflow region 6 and the sealing space 10, which is arranged between the inner inner casing 3 and the outer inner casing 2. The second angle ring connection 9 is also designed to allow an effective seal between the inflow region 6 and the second sealing space 11 which is arranged between the outer inner housing 2 and the outer housing 1.

During operation, thermal movements of the inner inner housing 3 in the flow direction 12 as well as perpendicular to the flow direction 13 can take place. The outer inner housing 2 can also exert heat movements in the flow direction 12 as well as perpendicular to the flow direction 13. To compensate for these thermal movements, serve the first angle ring connection 8 and the second angle ring connection 9. The first angle ring connection 8 comprises a first angle ring 14 and a Innengehäusewinkelringnut 15 arranged in the inner inner housing 3. Furthermore, the first angle ring connection 8 comprises an intermediate ring groove 17 arranged in an intermediate ring 16. The intermediate annular groove 17 is produced by a ring component 18. For this purpose, the ring component 18 is formed such that it is on the one hand connected to the intermediate ring 16 frictionally and on the other hand, an intermediate annular groove 17 is formed, in which the first angle ring 14 is arranged. The frictional connection between the ring component and the intermediate ring 16 is realized by a thread 32.

The first angle ring 14 comprises a first angle ring leg 19 and a second angle ring leg 20. The first angle ring leg 19 and the second angle ring leg 20 are substantially perpendicular to each other.

The second angle ring connection 9 essentially comprises a second angle ring 21. The second angle ring 21 comprises a first angle ring leg 22 and a second angle ring leg 23. The first angle ring leg 22 and the second angle ring leg 23 are substantially perpendicular to each other. The first angle ring leg 22 is arranged in a corresponding second intermediate ring groove 24. The second angle ring leg 23 is arranged in a corresponding valve diffuser groove 25. The valve diffuser groove 25 is made in the valve diffuser 4 ring component 26. The further ring component 26 is frictionally coupled by a thread 33 with the valve diffuser 4 and thereby formed such that the valve diffuser groove 25 is formed.

The intermediate ring 16 is connected via stud bolts 27 with capsule nuts to the outer inner housing 2.

In the FIG. 2 an alternative embodiment of the three-shell steam turbine is shown with valve. The main difference compared to the embodiment according to FIG. 1 is that the intermediate ring 16 is omitted and for the valve diffuser 4 is extended accordingly, so that in the valve diffuser 4 now another valve diffuser groove 28 is formed and suitable for receiving the first angular ring 14. The second angle ring 21 is disposed directly with the outer inner casing 2 in an outer inner casing groove 29.

In the FIG. 3 is another alternative embodiment of the three-bladed steam turbine to see. The difference between embodiment according to FIG. 3 and the embodiment according to FIG. 2 is that the second angle ring 21 is not directly with the outer inner housing 2 in an outer Innengehäusenut 29 is arranged, but that an insert 30 is provided, which is non-positively connected to the outer inner housing 2 and has an insertion groove 31 for receiving the second angle ring 21.

Claims (10)

Turbomachine with a valve,
the turbomachine comprising an inner inner casing (3), an outer inner casing (2) and an outer casing (1),
the valve comprising a valve diffuser (4) and a valve housing (7),
the valve housing (7) being connected to the outer housing (1) via a valve flange,
the inner inner housing (3) being connected to the valve diffuser (4) via a first angular ring connection (8),
characterized in that
the outer inner housing (2) is connected to the valve diffuser (4) via a second angular ring connection (9). Turbomachine according to claim 1,
wherein the inner inner casing (3) has a first angular ring (14) disposed in an inner casing angular ring groove (15). Turbomachine according to claim 1 or 2,
wherein the second angle ring connection (9) comprises a second angle ring (21) arranged in a valve diffuser groove (25) formed in the valve diffuser (4). Turbomachine according to one of the preceding claims,
wherein the outer casing (1) is disposed around the outer inner casing (2). Turbomachine according to claim 4,
wherein the outer inner casing (2) is disposed around the inner inner casing (3). Turbomachine according to one of the preceding claims,
wherein the valve diffuser (4) for flowing flow medium in a flow direction (5) is formed and the Innengehäuswinkinkelnut (15) is formed substantially parallel to the flow direction (5). Turbomachine according to one of the preceding claims,
wherein the valve diffuser groove (25) is formed substantially perpendicular to the flow direction (5). Turbomachine according to one of the preceding claims,
wherein an intermediate ring (16) is frictionally arranged on the outer inner housing (2) and has a second Zwischenringnut (24) for receiving the second angular ring (21). Turbomachine according to claim 8,
wherein the intermediate ring (16) has a first Zwischenringnut (17) for receiving the first angular ring (14). Turbomachine according to one of the preceding claims,
wherein the first angle ring (14) has a first and a second angle ring leg (19, 20), wherein the first angle ring leg (19) in the Innengehäuswinkinkelnut (15) and the second angle ring leg (20) is arranged in the Zwischenringnut.

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