JPS608474A - S-shaped tubular water wheel - Google Patents

Abstract

PURPOSE:To increase the ridigity of a draft tube inlet part by providing plural annular ribs on the outer periphery of the draft tube. CONSTITUTION:Plural annular ribs 22 are provided on the outer peripheral part 21a of a water wheel while distributed in the water current direction. The rib 22 is formed U-shaped in its cross section, and its opening side is welded to the upstream side outer peripheral part 21a of the draft tube. The upstream side outer peripheral part 21a of the rib 22 and the draft tube around said rib is covered with foundation concrete 26. The draft tube outer peripheral part 21a located upstream of a water sealing part 17 is increase its rigidity by the rib 22, and the rib 22 is fixed by the foundation concrete 26, so that the vibration of the outer peripheral part 21a is eliminated due to a circulating water flow from a runner vane 6 even if an off cam operation is performed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a system in which a water wheel shaft is guided out of the pipe by penetrating the pipe wall of the curved part of the suction pipe which is curved in an S shape. Regarding the S-type tubular water turbine that is connected to the body, the rigidity of the suction pipe entrance is increased to prevent damage to the receptor and the like.

[Prior art and its problems]

This type of water turbine is used to utilize ultra-low head water turbines with a head of 20 m or less, and because the suction pipe is generally thinner than its diameter, the swirling flow from the runner generates vibrations that cause the water to flow. Since the first outlet pipe of the water sealing part of the axle is damaged and the water turbine power receptor is damaged, it is desired to increase the rigidity of the outlet pipe.

1 and 2 show conventional embodiments, and FIG. 1 shows the S
FIG. 2 is a plan view of the main parts of FIG. 1. First, the main structure of a water turbine will be explained. This water turbine is a tubular water turbine in which a suction pipe 1y1'' is bent into an S-shape to pass through the water wheel shaft 2, and a generator 3 is installed outside the waterway downstream of the water turbine. It is a water turbine in which an oil introduction device 5 is installed externally, and the runner blades are movable up to a range where the outer diameter of the runner is relatively small.The generator 3 is connected to water 41 via a speed increaser 7, It has been made compact so that it can increase the speed up to 75 Orpm with 5Q [lz or 72 Orpm with 60112, and can easily cope with the moment of inertia required by the water turbine.In addition, the water rotation speed is 514 rpm at 60H7. Or 45 with 5Qnz
If Orpm is high, the rotational speed of the light scatterer can also be made to match VC, so that the speed increaser 7 can be omitted and the water turbine and the power generation a3 can be directly connected.

Both the guide blade 8 and the runner blade 6 are movable, and the runner blade 6 is VC1:H so that the angle can be automatically changed according to the opening degree of the guide blade 8. A runner blade operating mechanism (not shown) is provided inside the nabos 9, and a runner servo motor 4 is provided inside the cambling 10 on the downstream side of the water wheel shaft 2. The runner blades 6 are operated by the operation of the runner servo motor 4. The operating oil is introduced through the water wheel shaft 2 from a pressure oil introduction device 5, and the pressure oil introduction device 5 is first provided on the center line of the water wheel shaft 2 on the downstream side of the speed increaser 7. The guide blade 8 is an outer casing 12b connecting the suction pipe 1 on the upstream side with respect to the runner blade 6.
and an inner casing 12a attached to the runner boss 9, one shaft 8a projects outward from the outer casing 12b, and the shafts 8alC (not shown) are connected via a guide arm (not shown) and a link. Connected to the side of the kite ring.

The opening and closing of the guide blades 8 is controlled by rotating this kite ring via a link mechanism (not shown) by a servo motor 14 disposed within the bit 13. The inner casing 12a is supported by the outer casing 12b and the foundation via the steven 15. Due to the above configuration, the opening degree of the guide blade 8 and the angle of the runner blade 6 are linked to achieve the optimum operating condition during operation of the water turbine. However, when starting the water turbine, the angle of the runner blades 6 is set in advance and the angle of the guide blades 8 is gradually opened (off-cam operation is performed).On the other hand, the suction pipe 1 has a relatively large diameter (and In comparison, since a thin iron plate is used, vibrations occur at the inlet of the suction pipe 1 due to the swirling flow from the runner blades 6 during off-cam operation, and the exposed portion 1a of the suction pipe 1 upstream from the water sealing part 17 of the water wheel shaft. There were disadvantages such as damage to the water turbine power receptor.

[Purpose of the invention]

It is an object of the present invention to eliminate the above-mentioned drawbacks, and to provide a highly reliable S-type Tuffler water turbine that increases the rigidity of the suction pipe inlet and prevents damage to the water turbine power receptor and the like.

[Key points of the invention]

According to the present invention, the above-mentioned object is achieved in a tubular water turbine in which the water wheel shaft is led out of the pipe by passing through the pipe wall of the curved part of the suction pipe curved into an S shape, and is coupled to a receptor. Multi-V annular lips are provided on the outer periphery of the suction pipe at least upstream from the water wheel shaft penetration part to surround and reinforce the suction pipe from the outside, distributed in the water flow direction, and a foundation is provided around the suction pipe where the lips are distributed. This is achieved by pouring concrete.

[Embodiments of the invention]

Examples of the present invention will be described below based on nine pages. Third
3 and 4 show an embodiment of the present invention, FIG. 3 is a configuration diagram of the main part of an S-type tubular water turbine, and FIG. 4 is a plan view of the main part of FIG. 3. Components that are the same as those shown in FIGS. 1 and 2 are given the same reference numerals and their explanations will be omitted.

21 is a suction pipe, the inlet side of the suction pipe 21 is connected to the outer casing 12b, the water wheel shaft 2 passes through the suction pipe 21 curved in an S-shape and is led out of the waterway, The generator 3 is coupled to the speed increaser 7 via the speed increaser 7.
The generator 3 is installed in the foundation concrete section 26K on the downstream side of the suction pipe 21.

The suction lip 22 on the upstream side of the water sealing part 17 of the water wheel shaft penetrating part 21a has a U-shaped cross section, and its opening side is welded to the upstream outer peripheral part 21a of the suction pipe. Further, the lip 22 and the upstream outer circumferential portion 21a of the suction pipe around the lip are covered with foundation concrete 26. In such a case, the rigidity of the suction pipe outer peripheral part 21a on the upstream side of the water sealing part 17 of the water turbine shaft penetrating part is increased by the annular lip 22, and the lip 22 is fixed by the foundation concrete. Even if the onokam operation is performed at the time of starting the water turbine, the outer peripheral portion 21a on the upstream side of the suction pipe does not vibrate due to the swirling flow from the runner blades 6.

〔Effect of the invention〕

As described above, the present invention provides a plurality of annular lips distributed in the water flow direction on the outer periphery of the suction pipe on the upstream side of the water sealing part that forms the penetration part of the water wheel shaft, and provides the lips and the outer periphery of the suction pipe around the lips. By placing foundation concrete in the area,
The rigidity of the iron plate suction pipe, which is relatively thin compared to its outer diameter, has been increased,
A reliable braided S-shaped tubular water turbine can be provided by preventing damage to the water turbine power receptor coupled to the water wheel shaft lead-out portion.

[Brief explanation of drawings]

Figures 1 and 2 show conventional embodiments, Figure 1 is a configuration diagram of the main parts of an S-type tubular water turbine, Figure 2 is a plan view of the main parts of Figure 1, and Figure 3 Figure 4 shows an embodiment of the present invention, Figure 4 is a block diagram of the main parts of an S-type tubular water turbine, and Figure 4 is a plan view of the main parts of Figures i; l: 3. 17... Water sealing part as penetration, 21... Suction pipe,
22...Annular lip, 26...Foundation concrete.

Claims (1)

[Scope of Claims] 1) In a tubular water turbine in which the water wheel shaft is led out of the pipe by passing through the pipe wall of the curved part of the suction pipe curved in an S shape and is coupled to a receptor, the water A plurality of annular lips are provided on the outer periphery of the suction pipe on the upstream side to surround and reinforce the suction pipe from the outside, and are provided with a foundation around the suction pipe where the lips are distributed. An S-type tubular water turbine characterized by being poured with concrete. 2. In the water turbine according to claim 1, the water sealing portion provided in the water wheel shaft penetrating portion is supported by the foundation concrete. This is an S-shaped tubular water turbine.