Axial compressor with an injection device to a nozzles of a liquid.

Technical area the available invention concerns an axial compressor in accordance with the generic term of the requirement 1. you concerns further a procedure for manufacturing an axial compressor as well as a gas turbine with such axial compressor.

State of the art with axial compressors, how they are used in particular to part in gas turbines, is frequently desirable it, into the Gaskanal, in which the compression takes place, a liquid, in particular water, in nozzles, in order to affect the thermodynamic process running off. With such a nozzles must be taken on the constructional peculiarities and geometrical conditions in the axial compressor consideration, if extensive and expensive changes and adjustments in the structure of the axial compressor are to be avoided.

From the block letters EP 0,984,138 a compressor is well-known, with which for the cooling of the driveshaft cooling air is blown out by blowing out openings in the shovel points by guide vanes against the driveshaft. Such a configuration is suitable for a nozzles of a liquid into the gas flow and requires a special arrangement of the guide vanes.

In the block letters US 6,644,935, for the improvement of the efficiency in an axial compressor a liquid is suggested into the gas flow in nozzles. For this radially aligned nozzles are used, which are accommodated directly in a drilling in the housing of the compressor. Such an direct arrangement with entrance in a housing wall is possible from the outside only with compressors, whose housing structure is particularly simple. Against it if bleed air chambers and appropriate bleed air flanges are intended in the compressor, such a jet arrangement cannot be realized any longer easily. Beyond that tightness problems arise, as well as problems of the mechanical and thermal firmness.

The block letters US 7,033,135 suggest, a liquid into the gas flow of a turbomachine through in radial direction distribute arranged openings at the rear edge of a guide vane in nozzles. For the connection of the Leitschaurel to a liquid supply the housing must be worked on inside aufwändig. Beyond that is not particularly favourable a nozzles of the liquid in direction of flow for the mixture of gas and liquid fog.

Representation of the invention here wants to create the invention remedy. It is from there a task of the invention to create an axial compressor which avoids the specified disadvantages of well-known solutions and on simple and easily realizable way into itself the gas flow makes effective a nozzles possible of liquid to indicate as well as a procedure for its production.

These and other tasks are solved by the characteristics of the requirements 1 and 9.

The invention goes out from an axial compressor to the compression of air, in particular for a gas turbine, which axial compressor covers a rotor with a majority of rotor blades as well as the rotor concentrically and with distance, swivelling around a machine axle, surrounding housing, which housing as well as the rotor forms a circular Gaskanal and outside of the Gaskanals, preferably circular and concentric, bleed air chambers exhibits, which are located through in each case, preferably circular and concentric, bleed air slots with the Gaskanal in connection.

The invention is characterised by the fact that the axial compressor is equipped with at least one injection device to a nozzles of a liquid, in particular water, that those covers at least one injection device a majority of nozzles, which distributes the liquid over the extent over a bleed air slot into the Gaskanal in nozzles that those at least one injection device first means for supplying and distributing liquid and/or.

Water to the individual nozzles covers, which in that the bleed air slot assigned bleed air chamber it is arranged and that the first means via a pick-up flange attached at the housing with the liquid one supplies from the outside.

An arrangement of the axial compressor after the invention is characterized by the fact that the nozzles are arranged in the bleed air slot. By the use of the existing bleed air slot as opening for the admission of the nozzles for a nozzles necessary treatment of the housing to the extent drastically one reduces. An entrance to the nozzles results in a simple manner at the same time from the bleed air chambers arranged behind the bleed air slots.

Usually the bleed air slots are arranged bent to the direction of flow, so that the gas flow can be better tapped. This can be used favourable way for an arrangement of the invention, which is characterized by it that the nozzles with their nozzle axle are tilted arranged to the machine axle aligned and from the radial direction in direction of flow, in such a manner that the liquid is eingedüst against the current in the Gaskanal.

Another arrangement of the invention is characterised by the fact that the first means cover a tube bend, which extends transverse to the direction of flow by the bleed air chamber, and to which the nozzles are fastened. A constructional simplification of the arrangement is reached by the combination from tube bend and nozzles to a unit and the mechanical stability of the arrangement is guaranteed at the same time.

A further simplification results from the fact that in accordance with another arrangement the tube bend is fastened to an inner wall of the bleed air chamber, and the tube bend by a flexible Verbindungsschlauch is connected with the pick-up flange. Thereby an uncoupling between the nozzles and/or the tube bend and the exterior of the housing is reached, which permit thermal expansions and raise regarding the sealing few problems.

If the housing is divided into a horizontal interface level in an upper housing half and is a lower housing half, with advantage the injection device the housing accordingly divided into an upper injection device and a lower injection device, whereby its own pick-up flange is assigned to the upper injection device and lower injection device preferably in each case. Thereby assembly and disassembly of the machine are highly simplified.

This is valid in particular if the first means in each case cover a semicircular tube bend for the upper injection device and the lower injection device, which extend transverse to the direction of flow by the bleed air chamber, and to which the nozzles are fastened.

In accordance with another arrangement of the invention, if appropriate bleed air chambers and bleed air slots are present, in axial direction several homogenous injection devices can be arranged one behind the other.

The Eindüsprozess can be adapted so still better and more flexibly to the thermodynamic requirements.

The procedure according to invention for manufacturing an axial compressor after the invention, which exhibits a housing, which is divided into a horizontal interface level in an upper housing half and is characterised a lower housing half, by the fact that in a step that or the pick-up flange (e) at the housing it is attached that in another step carrying elements for the first means are attached at an inner wall of the bleed air chamber, and that in a further step the first means are fastened with the nozzles arranged firmly to it to the carrying elements.

The gas turbine according to invention is equipped with an axial compressor after the invention.

Short explanation of the figures the invention is to be described in the following on the basis of remark examples in connection with the design more near. All elements not necessary for the direct understanding of the invention were omitted. Fig show. 1 Fig. 2 Fig. 3 in a cutout an axial compressor with injection devices for injecting a liquid into the Gaskanal in accordance with a remark example of the invention; in an increased cutout from Fig. 1 details of an injection device and in axial direction seen, the arrangement of the injection devices in an axial compressor in accordance with the invention with divided housing.

Ways to the execution of the invention the invention covers an axial compressor, in particular for a gas turbine, with a device to injecting and/or a nozzles of a liquid into the Gaskanal as well as a procedure for his production.

The injection device covers a jet arrangement to a nozzles of the liquid, appropriate tube bends for the distribution of the liquid on the nozzles as well as the mechanisms for the attachment of the device at the Gaskanal.

The moreover one flexible Verbindungsschläuche as well as pick-up flanges at the housing of the axial compressor are intended, by way of which the liquid can be supplied from the outside. The nozzles are arranged in the bleed air slots planned in the axial compressor and spray the liquid in a conical spray in a direction against the main gas flow. The spraying angle of the eingedüsten fluid jet causes a finely distributed fog over the entire height of the flow channel.

In Fig. 1 is shown in a cutout an axial compressor with injection devices for injecting a liquid into the Gaskanal in accordance with a remark example of the invention. The axial compressor 10 has a central rotor 11, which carries a multiplicity of rotor blades 14, those is radially aligned and into a circular, itself in the diameter tapering Gaskanal 12 projecting. The rotor blades 14 alternate in the Gaskanal 12 with guide vanes 15, which are attached at the inside of a housing 13, which surrounds the rotor 11 concentrically. The position of the rotor blades 14 is in such a way selected the fact that with appropriate rotation of the rotor 11 the gas flows coming in the Gaskanal 12 from right toward the drawn in arrow to the left and thereby is compressed.

In the housing 13 of the axial compressor 10 outward afterwards 12 several umlaulende bleed air chambers 16 are trained, the circulating bleed air slots 17 with the Gaskanal 12, over bent in direction of flow, in connection to the Gaskanal. Over the bleed air slots 17 compressed air flows into the adjacent bleed air chambers 16 and becomes from there over at the axial compressor 10 bleed air flanges 24 arranged outside in the enterprise (and 25 in Fig.

3) to the further use exhausted.

In accordance with the invention the bleed air chambers place there 16 suitable areas, in order to take up at little expenditure to a nozzles of a liquid necessary injection devices 18 and/or 18 ". At the same time the associated bleed air slots 17 are suitable from their training and inclination particularly well for the admission of the associated nozzles 22. By the optimal utilization already in the housing 13 existing area the expenditure, which develops during processing the housing 13 for the injection devices 18a, b, can be kept unusually small.

In accordance with Fig. 1-3 is in each case fastened b, from which over the extent it distributes the nozzles 22 into the associated bleed air slots 17 so far projects for the training of the injection devices 18, 18 " to a I nnenwand the bleed air chambers 16 by means of suitable carrying elements 23 tube bends 21 and/or 21a, that the point of the nozzles 22 at the outside edge of the Gaskanals 12 and/or at the housing inner wall (13c in Fig. 3) ends (see Fig. 2). The tube bends 21 and/or 21a, b are over flexible Verbindungsschläuche 20 attached to appropriate pick-up flanges 19 and/or 19a, b, which project from the outside by the outside housing wall into the bleed air chambers 16.

As from Fig. is evident to 3, the injection devices 18, 18 " - if the housing 13 of the axial compressor in an interface level at a housing flange 26 into an upper housing half 13a and a lower housing half of 13b, going through the machine axle 27, isolatable actual likewise isolated into an upper injection device 18a and a lower injection device 18b with semicircular in each case upper and lower tube bends 21a and 21b as well as associated upper and lower pick-up flanges 19a and 19b.

With proceeding for manufacturing such an axial compressor with injection devices the outside compressor stator is worked on by machine, in order to attach the pick-up flanges 19 and/or 19a, b. The moreover one the housing in the interface level is worked on, in order to attach the carrying elements 23 for the tube bends 21 and/or 21 A, b. Finally the semicircular tube bends 21a, b with the nozzles 22 arranged to it can be inserted.

The injection devices cover thus two semicircular tube bends in a concentric bleed air chamber with a multiplicity of nozzles, which are arranged along the tubing axle. The nozzles are arranged into the associated bleed air slot, which is directly behind a guide vane row and positioned before a rotor blade row regularly in direction of flow (see the injection devices 18, 18 " in Fig. 1). Each of the tube plates is connected by a flexible Verbindungsschlauch with an appropriate pick-up flange going through the housing, by which the liquid is introduced. The nozzles produce a fine spray in form of a cone, which is oriented against the direction of flow and which covers whole height of the Gaskanals (see Fig. 1).

Altogether the following advantages result with the invention:

- the housing of the axial compressor must be changed for the injection devices only slightly; - no two housing walls must be perforated with following sealing for the nozzles; - the semicircular tubular are compatible with the interpretation of the outside housing; - the ranges between the guide vanes and rotor blades do not have to be modified; - if guide vanes to be replaced, must not be removed the injection devices; - those external fittings do not have to be reduced, if the upper housing half is removed; - the number of nozzles can be changed (e.g. with the extension of an injection device), without the guide vanes must be changed; and - the position of the nozzles can be adapted in such a way that it the liquid between the guide vanes a nozzles, in particular, if the number of guide vanes is changed during a revision of the compressor.

Reference symbol list [of 0030] axial compressors 11 rotor 12 Gaskanal of 13 housings 13a, b housing half of 13c 18, 18 ", 18a, b 19, 19a, b 21, 21a, b 24, housing inner wall rotor blade guide vane bleed air chamber bleed air slot injection device Ansch lussflansch Verbindungsschlauch tube bend nozzle carrying element bleed air flange housing flange machine axle