DE1628232C - Centrifugal compressor - Google Patents

Description

3 4

A torsion bar 35 rotatable about its longitudinal axis

The adjustment of the adjusting ring again in a constant throttling is used by means of pivotable articulated arms 37

sellage can be kept. and 39 to turn the adjusting ring 15. The torsion bar 35

On the basis of drawings, an execution can in a known manner by an electrical,

Example of the invention explained in more detail. It shows 5 actuated pneumatic or hydraulic servomotors

F i g. 1 is a longitudinal section through part of a, which corresponds to the compressor load

Centrifugal compressor, the operating size of the compressor or one with it in

Fig. 2 is a view taken along line Π-2 of Fig. 1, related device. When

F i g. 3 is a plan view of the adjusting device of the compressor z. B. used in a refrigeration machine

for the inlet guide vanes and the throttle device ίο, the adjustment devices could be set to the tem-

of the diffuser. temperature of the quenched, leave the machine-

In a radial compressor 1 of known design, the water will respond, this temperature of

the gas to be compressed depends on the amount of refrigerant circulating by the

padded impeller sucked in axially. The gas flows on the low pressure side to the high pressure side of the machine

from the impeller radially outward into a diffuser 15 is conveyed through the compressor. When the

which is used closer to the blade trailing edges of the impeller to compress air,

borders. The compressor has a housing 2 in which the adjustment devices could

the inlet 3 and the diffuser 5 are formed. It is exercise temperature which is a measure of that

only part of the conventional housing is air tight and the amount of air to be compressed

indicates. In the housing 2, between the inlet 3 and the 30 represents.

Diffuser5, there is an impeller7, which can be seen on a As can be seen in Fig.3, have the cam track shaft9 is fastened by means of a nut 11. On the inside 21 a special shape. The cam tracks are Running are forward guide vanes 13, which are designed in such a way that by turning the adjusting ring 15 the housing 2 are rotatably mounted and the inlet guide vanes to change from their fully open position in serve the direction of flow and the throughput. 25 can be turned to a 60% closed position, An adjusting ring 15 is on balls 17 in a stationary manner without the diffuser flow being throttled. When Support ring 19 mounted and can thus be throttled more in the circumferential direction than the flow tion can be moved. Several cam tracks 21, the 60% closed position of the inlet guide vanes corresponds uniformly over the circumference of the adjusting ring 15, the adjusting ring 15 is rotated further are arranged so that they are with cam followers 30 by simultaneously the guide vanes 13 between ßel 23 are engaged. The cam followers 23 are best 60% closed and one 85% open of rollers 25 attached to rods 27. closed position and the throttle die Rods 27 are moved to a throttle device 29 device of the diffuser in such a way that the of the diffuser so that a rotation of the diffuser capacity from 100 to 5% of the maximum adjustment ring 15 an axial movement of the throttle device 35 decreases sluggishly. When turning the adjusting ring 15 device 29 within the diffuser 5 (the throttle device of the diffuser remains in the 5% dashed line Lines in Fig. 1), this movement position, while the inlet guide vanes 13 of with the shape and size of the cam tracks 21 of the 85% closed to the fully closed matches. Move position. Through this coupling of the motions

Arms 31 of the inlet guide vanes 13 are formed by articulation of the inlet guide vanes and the throttle device arms 33 connected to the stalk 15 so that one of the diffuser is the delivery rate of the compressor Rotation of the adjusting ring 15 rotates the inlet guide over the entire range of possible flow blades 13 results. amounts made maximum.

1 sheet of drawings

Claims (2)

Patent claims: 1. Centrifugal compressor with a disposed between an inlet channel and a diffuser channel Impeller, rotatably mounted inlet guide vanes to change the fluid flow rate, a throttle in the diffuser channel for throttling the diffuser flow and a mechanical adjusting device for adjusting the inlet guide vanes and the throttle in a dependent and predetermined sequence, characterized in that, that the adjusting device (15, 17 ... 39) is a rotatable in the circumferential direction, Adjusting ring (15) mechanically coupled to the inlet guide vanes (13) with a cam guide (21), in which a cam lever (23) for the axial adjustment of the ring-shaped slide (29) trained throttle engages. 2. Radial compressor according to claim 1, characterized in that through the course of the cam guide (21) on the adjusting ring (15) of the throttle slide (29) when the adjusting ring is turned initially held axially immovable in the closing direction of the inlet guide vanes (13), in the loading ■ between a 60% to 85% closed position of the inlet guide vanes (13) axially into the diffuser channel (5) until the diffuser capacity is reduced to 5% and then axially immovable again up to the closed end position of the inlet guide vanes (13) is led .. 35 40 The invention relates to a centrifugal compressor with a between an inlet port and impeller arranged in a diffuser channel, rotatably mounted inlet guide vanes for changing the flow rate of the fluid, a throttle in the diffuser channel for throttling the diffuser flow and a mechanical one Adjusting device for adjusting the inlet guide vanes and the throttle in a mutually dependent manner and given order. In known centrifugal compressors of this type (British patent specification 1006147, USA patent specification 289 919) is, on the one hand, the mechanical adjustment device designed as an axially displaceable adjusting ring with the inlet guide vanes via levers and on the other hand with the axially displaceable one Ringwand.des Diffusorkanais formed throttle coupled via a dead passage-prone stop connection, whereby the diffuser throttle is axially immovable during the first part of the displacement of the position held in their maximum open position and only in a second area, that is, when the inlet guide vanes are already partially closed, axially displaced in the direction of a narrowing of the diffuser channel shall be. Because of the backlash connection between the adjustment device and the throttle, however, it can occur at the known compressors come to flutter movements of the diffuser throttle, and also ensures the the kinematic coupling achieved in the process is often not that required for optimal compressor operation Coordination of the motion sequences of the diffuser throttle and inlet guide vanes. In addition, the mechanical Actuating drive to move the diffuser throttle apply considerable actuating forces and therefore cumbersome and complex and without the desired responsiveness. In contrast, the invention is based on the object in a centrifugal compressor of the type mentioned at the beginning Way to achieve a more precise coordination of the adjusting movements than with the known compressors is possible with a dead-end stop connection between the adjusting ring and the diffuser throttle. For this purpose, the radial compressor according to the invention is characterized in that the adjusting device an adjusting ring that can be rotated in the circumferential direction and is mechanically coupled to the inlet guide vanes with a cam guide, in which a cam lever for the axial adjustment of the ring-shaped Engages the slide formed throttle. In the radial compressor according to the invention, the effect between the circumferentially rotatable Adjusting ring and the cam guide provided for the diffuser throttle on the one hand, a forced coupling the throttle to the adjusting ring, so that undesirable fluttering movements of the throttle, as is the case with the known Compressors with announcement connection can occur, be prevented, and on the other hand any desired cam guide can be created in the simplest possible way by suitable selection of the course of the cam guide kinematic coordination between the rotary movement of the guide vanes and the displacement get the throttle in the diffuser channel, so that an optimal control of the compressor over the entire adjustment range is possible. By designing the throttle as an annular slide furthermore, undesirably high loads from the mechanical connection between the adjusting ring and the throttle kept away and only relatively low actuating forces are required to close the throttle slide, what a sensitive control and easy training of the mechanical actuator and an extremely precise coordination of the actuating movements permitted. In a further advantageous embodiment of the invention, there is a particularly expedient coordination the movement sequences of inlet guide vanes and throttle valve in that through the course the cam guide on the adjusting ring of the throttle slide when turning the adjusting ring in Closing direction of the guide vanes initially held axially immovable, in the area between one up to 60% up to an 85% closed position of the inlet guide vanes axially in the diffuser channel up to a reduction of the diffuser capacity to 5% and then to the closed End position of the guide vanes is again guided axially immovable; this has the particular advantage that the throttle is already in the maximum before reaching the fully closed position of the inlet guide vanes Throttle position is reached and is held in this position until the guide vanes are fully closed, as is desired for a favorable regulation of the compressor, whereas with the known compressors with backlash-affected stop connection, the throttles necessarily over the entire last Section of the adjustment range up to the fully closed position of the inlet guide vanes.