Housing for a bucket wheel turbine

Abstract

The subject of the invention is a casing (2) for a bucket wheel turbine (1), which casing (2) surrounds the outer circumference of a runner (8). According to the invention, the casing inner side (7) is provided with a recess (6), which deflects the splashing water from the runner (8) in a direction parallel to the runner axis (4) of the runner (8), thereby discharging the splashing water from the casing (2).

Description

Technical Field

[0001] The present invention relates to a housing for a Pelton turbine, wherein the housing surrounds the outer periphery of the Pelton runner. Background Technology

[0002] In bucket turbines, especially in the high-power range, a large amount of splashing water must be discharged from the turbine casing. Due to the centrifugal force of the rotating runner, a significant amount of water splashes into the inner side of the casing. Ideally, this splashing water should not bounce back onto the runner; instead, it should be deflected away from the turbine casing as quickly as possible.

[0003] Several solutions intended to help drain splashed water are known in the prior art. For example, EP1828596A describes a guide device fixed inside a housing that deflects and drains splashed water. Such a guide device is typically designed as a steel plate. Here, the guide plate is at risk of unwanted vibration. In the worst case, the steel plate or its components may detach and damage the impeller. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a casing for a water turbine that can quickly discharge splashed water and avoid the use of guide plates.

[0005] This technical problem is solved by the housing according to claim 1.

[0006] According to the invention, grooves are provided on the inner side of the casing. Through these grooves, splashing water from the turbine is deflected in a direction parallel to the turbine's rotation axis, thereby exiting the casing. Therefore, through these grooves, the splashing water is given a velocity component parallel to the turbine's rotation axis, i.e., towards the free end of the turbine. The splashing water is preferably deflected by the grooves, causing it to exit the casing in a spiral shape.

[0007] Therefore, by adopting this technical solution, unwanted vibrations or damage caused by guide plate detachment will no longer occur. Furthermore, this technical solution is very easy to maintain. Existing equipment can also be modified using this groove design.

[0008] The casing of a bucket turbine preferably uses a vertical rotating shaft, so that splashed water is discharged downwards from the casing through grooves.

[0009] Advantageously, the grooves are spiral-shaped, as this allows splashed water to be discharged from the impeller area in a spiral pattern along the inside of the casing.

[0010] Advantageously, the cross-section of the groove increases progressively from the starting point (where the splashing water impacts the groove) to the ending point (where the splashing water leaves the groove). The amount of splashing water that needs to be discharged increases continuously from the beginning to the end of the groove. Because of the increasing cross-section, this continuously increasing volume of water can be drained more effectively.

[0011] The shell can be made of concrete, for example, with the grooves carved out of the concrete structure.

[0012] It is also feasible to make a metal casing with corresponding grooves. Attached Figure Description

[0013] The invention will now be described with reference to the accompanying drawings. In these drawings:

[0014] Figure 1 A schematic top view of a bucket turbine with a housing according to the invention is shown;

[0015] Figure 2 yes Figure 1 A sectional view;

[0016] Figure 3 It is similar Figure 2 A cross-sectional view, but the wheel and wheel shaft are not shown;

[0017] Figure 4 A top view of the housing according to the invention is shown; the interior is not shown.

[0018] Figure 5 yes Figure 4 A sectional view.

[0019] The same reference numerals in each figure refer to the same equipment component. Detailed Implementation

[0020] Figure 1 The housing 2 for a bucket turbine 1 according to the invention is shown. Here, the housing 2 surrounds the outer periphery of the runner 8. Within the housing 2, there are six openings 5 ​​for six nozzles 3. During operation, water flows through the nozzles 3, impacting and rotating the runner 8. The splashing water then strikes the inner side 7 of the housing 2 and is deflected obliquely downwards in a spiral by grooves 6 on the housing wall, thus being removed from the housing 2. The grooves 6 therefore impart a velocity component to the splashing water in a direction parallel to the vertical runner shaft 4. Thus, conventional guide plates are unnecessary.

[0021] Figure 2 As shown, the grooves 6 are spiral-shaped. They extend obliquely downwards along the circumferential direction of the inner side 7 of the housing. Here, the circumferential direction is the same as the rotation direction 12 of the wheel 8.

[0022] Inside the housing 2, a conical cylinder 9 is arranged above the rotor 8, which protects the bearing above the rotor shaft 4 from being splashed by water.

[0023] To make it clearer, Figure 3 The housing 2 without the rotating wheel 8 and the rotating wheel shaft 4 is shown.

[0024] Figure 4 and Figure 5 The shell 2, without any internal structure, is shown. This clearly demonstrates that the groove 6 has a smaller cross-section at its starting point 10 than at its ending point 11. Here, the starting point 10 is where splashed water from the impeller 8 reaches the groove 6, and the ending point 11 is where the splashed water leaves the groove 6. The ending point 11 of the groove 6 is preferably located below the impeller 8. In this example, the groove 6 is carved into the concrete of the shell 2.

[0025] However, the housing 2 can also be lined with a metal plate or made entirely of metal.

[0026] List of reference numerals

[0027] 1. Bucket turbine

[0028] 2 shells

[0029] 3 nozzles

[0030] 4-wheel shaft

[0031] 5. Opening in housing 2 for nozzle 3

[0032] 6 grooves

[0033] 7. Inner side of the casing

[0034] 8-wheel

[0035] 9 conical tubes

[0036] 10. Starting point

[0037] 11. Termination

[0038] 12. Rotation direction

Claims

1. A casing (2) for a bucket turbine (1), wherein, The housing (2) surrounds the outer periphery of the wheel (8), characterized in that a groove (6) is provided on the housing wall on the inner side (7) of the housing, the groove being able to deflect splashed water from the wheel (8) in a direction parallel to the wheel shaft (4) of the wheel (8) and discharge it out of the housing (2).

2. The casing (2) for a bucket turbine (1) according to claim 1, characterized in that, The housing (2) surrounds the water turbine (1) with a vertical rotor shaft (4), and the groove (6) deflects the splashing water downwards.

3. The casing (2) for a bucket turbine (1) according to claim 1 or 2, characterized in that, The groove (6) is designed to be spiral-shaped.

4. The casing (2) for a bucket turbine (1) according to any one of claims 1 to 3, characterized in that, The cross-section of the groove (6) increases continuously from the beginning (10) to the end (11). The splashing water hits the groove (6) at the beginning and leaves the groove (6) at the end.

5. The casing (2) for a bucket turbine (1) according to any one of claims 1 to 4, characterized in that, The shell (2) is made of concrete, and the groove (6) is machined directly into the concrete.

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