JPS6349080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a regulating device, and in particular to a regulating device for guide vanes of an axial compressor.

As is well known, axial flow compressors can be constructed with an annular array or stepped guide vanes. Additionally, it is known to use various types of adjustment devices to adjust the angle of the vanes from time to time. For example, one known adjustment device, described in Swiss Patent No. 553921, employs an adjustment sleeve to which a guide vane is connected, and to which the sleeve is mounted on a bearing within the compressor housing. It is slidably mounted on the block via a rod. Furthermore, a pair of servo motors coupled parallel to the working medium are used for axially moving the adjustment sleeve. However, since inaccuracies in the synchronization of the two servo motors are inevitable, if the sleeve has a relatively short axial length and a large diameter,
As a result, the adjustment sleeve may jam.

Other known adjustment devices, such as those described in Swiss Patent No. 557960, use rotatable adjustment rings for each stage. In this case, the individual adjustment rings are connected together by three spring bands, said spring bands being circumferentially distributed and further rotatably mounted on the vane support. ing. One driven adjustment ring is rotated through a small angle as a linear function of the direction of a fixed point on the vane support, and the spring band is twisted. however,
Due to the torsional stress of the spring band, the limits for the rotation of the adjustment ring and therefore the adjustment of the guide vanes are narrowed. Furthermore, the smaller the adjustment angle, the closer the stage is to the bearing point of the spring band on the vane support.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adjustment device for guide vanes of an axial compressor that can prevent jamming.

Another object of the invention is to adjust the guide device of an axial compressor so that it is possible to adjust the same relatively large angular range for all stages.

Briefly, the present invention provides a regulating device for an axial compressor having a plurality of annular rows of guide vanes disposed about a longitudinal shaft. The adjusting device is operative to move the guide vane in the axial direction of the shaft of the compressor, and includes an adjusting sleeve mounting the guide vane and coaxially spaced from the sleeve and extending into the compressor. and a setting ring rotatably mounted around the compressor shaft. Further, around the ring, at least 3
Book connecting rods are circumferentially spaced apart, each of which is connected at one end to the setting ring and at the other end to the sleeve for axially moving the sleeve in response to rotation of the ring. are freely connected. A servo motor is also connected to the ring via a transmission to rotate the ring around the compressor shaft.

The transmission includes a pair of parallel, pivotally mounted levers, such as toggle levers, and a linkage connected to and between the levers and a setting ring.

In this adjustment device, the adjustment action is performed by a single servo motor acting on the setting ring via a toggle lever and a linkage. Due to the rotational action of the axially fixed and radially guided setting ring, the adjusting sleeve, which is also axially guided, is moved axially by the connecting rod. This adjustment sleeve will adjust the guide vane via the adjustment lever.

The three connecting rods are provided with spherical heads or ball joints at their ends to transmit the moving force. In this way, tilting moments in the adjusting sleeve can be prevented. Furthermore, the adjustment range of this adjustment device is considerably greater than that of known spring band type devices due to the use of three connecting rods.

In order to compensate for inaccuracies during installation, it is advantageous for the length of the connecting rod to be adjustable. It is also possible to guide the setting ring axially and radially, if the setting ring is mounted in a groove in the vane carrier without lubricant, for example via a self-lubricating lining. It turns out it's easy.

These and other objects and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings.

Referring to FIG. 1, the axial compressor (partially shown) has a housing 1 at the suction or suction end defining a suction chamber 2 about the longitudinal axis, the terminates at the vane channel 4 via the inlet ring 3. Within the channel 4 are a plurality of annular rows or steps of guide vanes 5.
is mounted and adapted to cooperate with a rotor 40 having a plurality of rotor blades 41 as shown in FIG.

Said guide vane 5 is rotatably mounted in a guide vane support 6 via an axle 7 . Each shaft 7 is furthermore connected to a respective setting lever 8 on the outside of the vane support 6, which engages in an annular groove 11 of the ring 12 via a sliding block 10.

The adjustment device includes an adjustment sleeve 13 to which the ring 12 is fixed, so that an axial movement of the sleeve 13 causes the vanes 5 to rotate about their respective axes. The adjusting sleeve 13 consists of two segments of different diameters, which are connected via a flange-shaped dividing wall 14. The adjustment sleeve 13 is also connected to a bearing block 16 mounted on the housing 1 via a rod 15.
The upper part is supported for axial displacement. As shown, the rod 15 is rigidly connected to the sleeve 13 and is slidable within the bearing block. Also, as shown, the sleeve 13 surrounds the guide vane support 6 and extends only over the first stage or first row portion of the compressor with adjustable vanes 5.

The adjustment device also includes a setting ring 26 and three connecting rods 17 spaced circumferentially around the sleeve 13 and the setting ring 26, and which are connected to an adjustable guide vane 5. The sleeve 13 is moved in the axial direction necessary for the adjustment. At one end, the connecting rod 17 is freely connected to the sleeve 13 by means of a spherical head or ball joint 18, each of which is connected to the downstream surface of the dividing wall 14 in the direction of flow. It is held by a pin 19 between two straps 20 welded to. The opposite end of each connecting rod is freely connected to the setting ring 26 via a ball joint 24 and a pin 25 inserted radially into the setting ring 26.

Each connecting rod 17 is axially adjustable in length. To this end, the central part of each rod 17 has two threaded ends, which can be screwed into the female thread of the respective corresponding end piece 21. Additionally, a locking nut 23 is screwed onto each end of said central section, making it possible to fix the adjusted length of the individual rods 17 once the correct length of the rod has been obtained during installation. .

The setting ring 26 is spaced coaxially from the sleeve 13 and is rotatably mounted within the compressor about the axis of the housing 1. For this purpose, said ring 26 is guided and held axially and radially in an annular groove 27 of the housing 1, said housing being provided with a self-lubricating lining, i.e. a self-lubricating bearing material. It is lined with a made lining. Since it is held axially and radially, the setting ring 26 carries out only rotational movements within the annular groove 27. The connecting rod 17 is therefore angularly changed relative to the longitudinal direction of the compressor, thereby causing the sleeve 13 to move axially.

In order to rotate the ring 26, the adjustment device employs a servo motor 28 located outside the housing 1 and a transmission 29 connecting this servo motor 28 to the ring 26. . Said transmission 29 has a shaft 30 passing through an opening 36 in the housing 1 and is mounted on said shaft 30 for pivoting therewith between two end positions as shown in FIG. A pair of parallel levers 31 that move, the levers 31 and the ring 2
6 and a linkage connected therebetween. As shown in Figure 2,
The linkage includes a ball joint 32 between the levers 31, a rod 33 having the same structure as the connecting rod 17, and a ball joint 3 mounted on a protrusion 35 on the setting ring 26.
4. In this way, when the shaft 30 or the lever 31 rotates, the setting ring 26
is rotated, which further axially moves the adjustment sleeve 13 in the axial direction.

Thus, the present invention provides an adjustment device for guide vanes of an axial compressor that can operate without jamming while allowing relatively large angular sweeps through all stages during adjustment.

[Brief explanation of the drawing]

1 is a top view of a portion of the lower half of a compressor incorporating a regulating device according to the invention, now divided along a horizontal plane; FIG. 2 is a cross-section taken along the line - of FIG. 1; It is a diagram. In the figure, 5... Guide vane, 13... Adjustment sleeve, 17... Rod, 26... Setting ring, 28... Servo motor, 29... Transmission device, 31... Lever, 40... Shaft. .

Claims (1)

[Claims] 1. In an axial flow compressor having a longitudinal shaft and a plurality of annular rows of guide vanes arranged around the shaft, the guide vanes are moved in the axial direction of the shaft. In the adjustment device for adjusting the guide vane, the adjustment sleeve is connected to the row of guide vanes, and the adjustment sleeve and the sleeve are coaxial, and the adjustment sleeve rotates the vane according to the axial movement of the sleeve. a setting ring spaced apart and rotatably mounted in the compressor about the shaft and axially moving the sleeve as the ring rotates; for,
at least three connecting rods freely coupled at one end to the setting ring and at the other end to the sleeve and spaced circumferentially about the ring; one servo motor and for rotating the ring around the shaft;
and a transmission connecting the servo motor to the ring. 2. The adjusting device for an axial flow compressor guide vane according to claim 1, wherein both ends of the rod have spherical heads. 3. The shaft of claim 1, wherein said transmission device includes a pair of pivotally mounted parallel levers and a linkage connected to and between said levers and said ring. Adjustment device for flow compressor guide vanes. 4. The axial flow compressor guide vane adjusting device according to claim 1, wherein each of the rods is adapted to have an axial length adjusted. 5. The axial compressor guide vane adjustment device of claim 1 including a self-lubricating lining within which said ring is rotatably mounted.