JPS60187773A - Branch tube of pelton water turbine - Google Patents

Abstract

PURPOSE:To reduce stress concentration at the root of the branch pipe and distribute the proper flow amount of water to nozzles by a method wherein the root section of the branch tube at the opposite side of the nozzle is penetrated through the wall of a main tube obliquely to introduce the root section into the main tube and the tip end thereof is opened toward the upstream side of the flow of pressure water in the main tube. CONSTITUTION:The branch tube 41 is inserted partially into the bent tube 31 through the inserting hole 27 of the same tube 31, the branch tube 42 is inserted partially into the bent tube 32 through th inserting hole 27 of the bent tube 32 and the branch tube 43 is inserted partially into the bent tube 33 through the inserting hole 27 of the bent tube 33. The ends of these tubes in the bent tubes are opened toward the upstream side of each bent tube, therefore, the stress concentration at the connecting section between the bent tube and the branch tube may be eliminated and the proper flow amount of pressure water may be distributed to each nozzle.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention is directed to a branch main pipe which is a curved pipe body arranged to surround the launch of a Pelton water turbine from the outside and receives pressurized water from a penstock; The present invention relates to a branch pipe of a Pelton water turbine comprising a plurality of branch pipes that receive the distribution of pressure water from the main branch pipe and guide the distributed pressure water to a nozzle attached to the tip.

[Prior art and its problems]

Generally, Pelton turbines are impulse turbines that are used at high head points of 200 to 1,800 m, and horizontal shaft type is used for medium capacity and below, and shaft type is used for large capacity turbines. Fig. 1 shows the main part of a small-shaft single-wheel four-shot Pelton water turbine, and Fig. 2 shows a conventional example of the main part of a branch pipe with a welded structure, and its structure and operation will be explained. In the figure, l indicates branch pipes 1a, lb, lc
and a branch main pipe constructed as a combination of small curved pipes 3, which have progressively smaller diameters, through which pressurized water is led from a penstock (not shown). This branch main pipe l is arranged so as to surround a launch packet 10 provided on the outer periphery of the water turbine shaft, and includes a branch pipe 2 provided inside the branch pipes 1a, lb, and lc, and a branch pipe b- provided at the terminal end. A small bent pipe 3 connected to a nozzle vibe 5 leading to a nozzle 4 supplies an appropriate flow rate to the nozzle 4, and a runner packet 10 is connected to the nozzle 4 from the four nozzles 4.
Spray pressurized water towards.

A needle (not shown) is provided at the center of the tip of the nozzle 4 so as to be able to move forward and backward, and by changing the opening area of the nozzle 4, the amount of water jetted toward the lunch packet IO can be changed. A needle (not shown) is integrally attached to the tip of the rod, and a base end of the rod is attached to a piston (not shown) located inside a motor 7 that serves as a mechanism for advancing and retracting the needle (not shown). Nozzle 4 and lunch packet 1
A deflector 8 is provided between the nozzle 4 and the nozzle 4, and the deflector 8 is controlled by a speed governor (not shown), and bends the water jetted from the nozzle 4 when the load on the water turbine suddenly increases. A needle (not shown) advances to keep the speed increase within a specified value.

In such a Pelton turbine, the branch main l has a second
There are two types: one with a welded structure as shown in the figure, and one made of cast iron (not shown). There were drawbacks such as high manufacturing cost and high manufacturing cost.

[Purpose of the invention]

In view of the above points, an object of the present invention is to provide a branch pipe for a Pelton water turbine that can reduce stress concentration at the root of the branch pipe, distribute appropriate flow to the nozzle, and significantly reduce costs. do.

[The culmination of the invention]

According to the present invention, the above object is a curved pipe body arranged so as to surround the launch of a Pelton turbine from the outside, and a branch main pipe that receives pressurized water from a penstock, and a branch main pipe that receives pressurized water from the branch main pipe. and a plurality of branch pipes that receive the distribution of pressure water and guide the distributed pressure water to a nozzle attached at the tip, the base of the branch pipe on the side opposite to the nozzle diagonally runs along the pipe wall of the branch main pipe. It is introduced into the main pipe through the main pipe, and its tip is opened 10 times in the direction upstream of the flow of pressurized water in the main pipe.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a cross-sectional view of the main part of a branch pipe of a bean lees single-wheel four-shot Pelton water turbine showing an embodiment of the present invention, and in the figure, the same components as those shown in FIGS. 1 and 2 are shown. are given the same reference numerals and their explanations will be omitted. It is a branch main of a single-wheel four-shot Pelton turbine, and the branch main is connected to a bent pipe 31.
．． 32.33.34, branch pipe 41.42.43,
It is composed of a plurality of fixing plates 51, 52, and 53. The curved pipes 31.32.33J34 gradually become smaller in diameter, and the cross-sectional area of the inner diameter 31a of the inlet side curved pipe 31 becomes the A pipe 31.32.3.
Cone-shaped reduction tubes 61, 62, 63 are located downstream of 3, respectively.
is voiced. The upstream side of the curved pipe 31 is connected to a water conduit pipe having the same diameter as the curved pipe 31 leading to a large mouth valve (not shown) by flange connection, and the downstream side of the curved pipe 31, the upstream side of the curved pipe 32, and the The downstream side and the upstream side of the curved pipe 33 are both flange connected 25. Connected by %, bent pipe 31.32
．． A circular branch pipe insertion hole 27 having the same diameter is provided on the inner wall surface of each of the pipes 33 .

The branch pipes 41, 42, and 43 all have the same diameter, the cross-sectional area of the inner diameter is 1A, and are each formed in a curved shape. The branch pipe 42 is partially inserted into the pipe of the bend pipe 32 from the insertion hole of the bend pipe 32, and the branch pipe 43 is partially inserted into the pipe of the bend pipe 33 from the insertion hole r of the bend pipe. The ends of the pipes open toward the upstream side of the curved pipe, and the branch pipes 41, 42, 4
The portions of the corresponding curved pipes 31, 32, and 33 that pass through the insertion holes are watertightly sealed by welding. Further, the outer end of the curved pipe 31 of the branch pipe 41 is connected to the nozzle vibe 5 which communicates with the first nozzle 4 through a flange connection part, and the outer end of the branch pipe 420 and the curved pipe 32 is connected to the nozzle vibe 5 through a flange connection part. The outer end of the curved tube 33 of the branch pipe 43 is connected to the nozzle vibrator 5 which communicates with the third nozzle by means of a flange connection.

Reference numerals 51 and 52.53 are fixed plates, and these fixed plates are attached to the outer peripheral wall of the branch pipe 41.42.43 and the bent pipe 31.32.3.
The fixing plate 51 connects the outer circumferential wall of the branch pipe 41 to the inner circumferential wall of the bent pipe 31, and the fixing plate 52 connects the outer circumferential wall of the branch pipe 41 to the inner circumferential wall of the bent pipe 31. The outer peripheral wall of the pipe 42 is connected to the inner peripheral wall of the bent pipe 32, and the fixing plate 53 is connected to the branch pipe 4.
The outer circumferential wall of No. 3 is fixed to the inner circumferential wall of Curve No. 1 #33.

At the end of the main branch pipe connection, there is provided a bent pipe that connects to the nozzle vibe 5 that leads to the fourth nozzle 4, and the inner diameter cross-sectional area of this bent pipe is equal to 1! -A
The upstream side of the bent pipe is connected to the downstream side of the bent pipe by a flange connection 27.

Next, the flow of pressure water will be explained. When pressurized water from a penstock (not shown) is guided to the first bent pipe 31 via the water conduit garden, first, the pressure water at a flow rate of 1 in the pipe flows from the branch pipe 41 to the first nozzle 4. be guided. Therefore, the same amount of pressure water as the first flow rate flows into the next bent pipe 32, and the same amount of pressure water that was applied to the first nozzle is applied to the second nozzle 4 from the pressurized water in this pipe. Furthermore, pressure water of 1 flow at the initial flow rate flows into the next curved pipe, and from the pressure water in this pipe to the 1 flow. The same amount of pressurized water is directed to the third nozzle 4 as was directed to the second nozzle. Then, the pressure water at the initial flow rate of 7 flows into the final bent pipe 34 and flows into the fourth nozzle 4. Second. The same amount of pressure water is directed to the third nozzle. And 1.9g2. Third. Fourth
This can be achieved by injecting the same amount of pressurized water toward the runner packet from the four nozzles 4. In the above-mentioned embodiments, adjacent curved pipes are connected to each other by flanges, but the present invention is not limited to this, and even if adjacent curved pipes are welded to each other. good.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a branch main pipe can be manufactured by simply bending commercially available pipe materials for bending pipes and branch pipes. Eliminating concentration and distributing the appropriate flow rate to the nozzles,
Costs can be significantly reduced compared to conventional welded structures or cast iron branch pipes.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the main parts of a bean cake single-wheel four-shot Pelton water turbine, Fig. 2 is a plan view showing a conventional main part of a branch pipe with a welded structure, and Fig. 3 is an embodiment of the present invention. FIG. 2 is a sectional view of the main part of the branch pipe.

Claims (1)

[Scope of Claims] l) A branch main pipe which is a curved pipe arranged to surround the runner of a Pelton turbine from the outside and receives pressure water from a penstock, and distribution of pressure water from the branch main pipe. and a plurality of branch pipes which receive the distribution pressure water and guide the distributed pressure water to a nozzle attached to the tip thereof, wherein the base of the branch pipe on the side opposite to the nozzle extends diagonally through the pipe wall of the branch main pipe. A branch pipe of a Pelton water turbine, characterized in that the branch pipe is introduced into the main pipe and its tip is open toward the upstream side of the flow of pressurized water in the main pipe. 2. In the branch pipe according to claim 1, the branch pipe is welded to the main pipe at the branch main pipe penetration part at the base thereof,
A branch pipe of a Pelton water turbine, characterized in that its tip opening is supported on the inner wall of a pipe wall of a branch main pipe via a fixing plate arranged parallel to the flow in the main pipe. 3) In the branch pipe according to claim 1, the main branch pipe is constructed as an interconnected body of a plurality of curved pipes divided in the longitudinal direction, and each of the curved pipes has a substantially uniform cross-sectional area. A branch pipe of a Pelton turbine characterized by having. 4) A branch pipe for a Pelton water turbine according to claim 3, wherein adjacent bent pipes are interconnected via a conical reducing pipe. 5) 4 tf permissible rust range The branch pipe of a Pelton water turbine according to item 3, wherein adjacent bent pipes are flange-connected to each other. 6) A branch pipe of a Pelton water turbine according to claim 3, characterized in that adjacent bent pipes are welded together. 7) Range of Permissible Percentage Percentage In the branch pipe described in item 3, the branch pipes are provided in a one-to-one correspondence with the bent pipe, and the interconnected body of the branch pipe and the bent pipe is a transportation unit. A branch pipe of a Pelton turbine characterized by: