SE435411B - FLOOD CONTROL WITH PARALLEL SHOVERS - Google Patents

Description

8360817-7 10 20 25 30 the invention while Fig. Ä shows an example of a control means for mechanical regulation.

Fig. 1 shows a number of parallel guide vanes 1 which form a number between them parallel flow channels 2. In this case, the parallelism must be seen in relation to the flow direction. Is it, for example, a guide vane in a turbine or a turbocharger, the guide vanes are located radially in a ring so that they are not parallel in the longitudinal direction but are still parallel in relation to the flow direction namely all perpendicular to this direction.

For regulating the flow through the channels 2, rotary valves 3 have been inserted between the vanes 1. In Fig. 1 all valves are closed while in Fig. 2 it the upper one is closed, the lower two fully open and the second upper part partially open.

The object of the invention is thus that the regulation takes place step by step so that the majority of all valves are either fully open or fully closed and only one or a few individuals are partially open to fine-tuning. Thus the regulation becomes continuous step by step, and in this way either is achieved completely free flow or no flow at all through most of the valves. 1 Throttling losses occur only in those valves that are partially open.

If the paddle system according to the invention is used for tuning a flow as a one-time occurrence or from time to time the regulation can take place manually in that each valve is provided with some known form of operating arm, opening or closing the valves one by one until the desired flow achieved. If necessary, you can then fine-tune by opening one or a few single valves partially.

In this context, it should be pointed out that valves do not have to have the one shown in the form of drilled cylinders but can be designed as flat rotary dampers or they may consist of slide valves. The essential thing is that the valves are intended to be opened or closed completely, at least in the case of ten of them.

If the guide vanes are in a ring as in turbomachines, for symmetrical reasons, to avoid oblique loading of the rotor, it may be appropriate to split the in groups of shovels so that all groups have the same number of open and closed and semi-closed valves.

Furthermore, in the case of a ring of guide vanes should be either the vanes or the valves or both be conically shaped in the radial direction with the largest cross-section .ïííï QUALITY "f"

Claims (3)

8300817- 7 at the end to get a fit between blades and valves. Fig. 3 shows a variant of the vane system in Fig. 1 where, in addition to the continuous vanes 1, there are intermediate vanes H which divide the flow channels between the vanes 1. Thereby a smooth flow channel is obtained even with a half-open valve and thus smaller throttle losses. If you need to regulate the vane system during operation, you must usually use mechanical control, which is why you need some device to continuously and gradually open and close the valves. Such a device can be designed as shown in Fig. Ä. In this figure, the valves 3 are shown in broken lines. Each valve is provided with an operating arm 5 which ends in a pin 6. These pins are controlled by a common actuator in the form of a ball guide 8 with a groove 7 for the pins 6. In a turbo engine the ball control can be in the form of a ring surrounding the guide vanes where the groove 7 forms a helix with two turns 15 each in its own plane with a transition passage. When the slide control with this transition passage passes pin 6, the corresponding valve 3 will be switched from open to closed position or vice versa. In Fig. 3, the two lower valves are open, the second top half open and the top closed. If the valves are divided into groups, each group gets its own groove in the stage control with a length that is approximately twice the length of the group. Often some of the ducts can be without valves if you do not need to completely turn off the flow. CLAIMS ' Flow control with parallel guide vanes, characterized in that for regulating the flow through the system, valves (3) are arranged in the channels (2) between the vanes (1), which valves are provided with means for individual control of the valves. and one. Control system according to claim 1, characterized in that the valves (3) are intended for manual control. 3. Control system according to claim 1, characterized in that there is a control means (8), for example of the ball stage type, for switching one valve at a time between fully open and fully closed position. POÜIT "" '"" "QUALITY" www i' 833018 1 74-7 U. Control system according to claim 3, wherein the guide vanes are divided into groups, characterized in that each group is provided with its own control body for adjustment of one valve (3) at a time within the group.