JPH05321813A - Sediment mixing-in preventing device for pelton hydraulic turbine needle - Google Patents

Abstract

PURPOSE:To prevent sediment from mixing in the balance piston chamber of needle servo motor of Pelton hydraulic turbine. CONSTITUTION:A water supply pipe 9 is connected to a water supply port 8 of a balance piston chamber 3a while its one end is connected to a water taking-in port 7 of a nozzle pipe 1 and the other end penetrates the cylinder 4a of a needle 2 servo motor 4. A strainer 10 is inserted in the way of the pipe 9. A clean water obtained by removing the sediment flowing in the pipe 1 by means of the strainer 10 is supplied to the piston chamber 3a so that no sediment is mixed in the chamber 3a, thereby causing no malfunction of a needle 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing sediment from mixing in a built-in type needle servomotor of a Pelton turbine to prevent sediment from entering.

[0002]

2. Description of the Related Art In a Pelton turbine, pressure water guided by an inlet curved pipe is accelerated by a nozzle pipe, becomes a jet, hits a bucket of the runner, imparts a rotational force to the runner, and then falls naturally on a discharge surface. The needle in the nozzle pipe is opened and closed according to the load by a needle servomotor that works in conjunction with the speed governor to adjust the flow rate. FIG. 2 is a sectional view of a needle having a built-in needle servo motor. The nozzle pipe 1 is connected to an inlet bent pipe (not shown), has a nozzle tip 1a at its tip, and is supported by an upper rib 6a and a lower rib 6b in the nozzle pipe 1, and is a hydraulically operated needle servomotor. Built-in 4. The needle servomotor 4 includes a cylinder 4a, a piston 4b, and a piston rod 4c. The needle 2 is configured to be movable inside the cylinder 4a. When pressure oil is supplied from a water supply port (not shown), the needle 2 moves to the right and closes the nozzle pipe 1, and when pressure oil is supplied from another pressure oil port, the needle 2 moves to the left and opens the nozzle pipe 1. A needle water thrust force in the direction of closing the needle 2 acts on the needle 2. Conventionally, in order to apply a force opposite to the needle water thrust, a pressure intake hole 5 is provided in the bottom of the cylinder 4a on the downstream side, and flowing water is introduced into the balance piston chamber 3a. Therefore, the balance piston force in the direction of opening the needle 2 acts on the needle 2.

[0003]

Conventionally, the pressure water to the balance piston chamber directly takes in the river water introduced into the nozzle pipe, and the sediment and other impurities in the river water flow into the balance piston chamber. However, there is a risk that the needle may be unable to open and close.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a needle sediment prevention device for preventing sediment from flowing into a balance piston chamber of a needle servomotor of a Pelton turbine.

[0005]

In a Pelton turbine equipped with a built-in needle servomotor built in a nozzle pipe, one end is connected to an intake port of the nozzle pipe,
The above object is achieved by providing a water supply pipe having the other end penetrating the cylinder of the needle servomotor and coupled to the water supply port of the balance piston chamber, and a strainer inserted in the middle of the water supply pipe.

It should be noted that it is preferable to supply pressure water to the balance piston chamber if the water intake port of the nozzle pipe is located upstream of the water supply port of the balance piston chamber.

[0007]

In the present invention, pressure water is supplied to the balance piston chamber by the water supply pipe which connects the water intake port of the nozzle pipe and the water supply port of the balance piston chamber which penetrates the cylinder of the needle servomotor. Since a strainer is provided on the way to remove the sediment of the flowing water flowing through the nozzle pipe by the strainer, the sediment is not mixed into the balance piston chamber.

[0008]

1 is a cross-sectional view of a needle equipped with an apparatus for preventing soil contamination according to an embodiment of the present invention. In FIG. 1, FIG.
The same parts as are denoted by the same reference numerals. Nozzle pipe 1
Incorporates a hydraulically operated needle servomotor 4 which is supported inside by an upper rib 6a and a lower rib 6b. The needle servomotor 4 includes a cylinder 4a, a piston 4b, and a piston rod 4c. An annular packing 4d is provided between the needle 2 and the cylinder 4a.
When pressure oil is supplied from an oil supply port (not shown), the needle 2 moves to the right and closes the nozzle pipe 1, and when pressure oil is supplied from another pressure oil port, the needle 2 moves to the left and opens the nozzle pipe 1. . A needle water thrust force in the direction of closing the needle 2 acts on the needle 2.

In the present invention, one end is connected to the water intake port 7 of the nozzle pipe 1, and the other end is penetrated through the cylinder 4a of the needle servomotor and is connected to the water supply port 9 of the balance piston chamber 3a. The strainer 10 inserted in the water supply pipe was provided. The running water in the nozzle pipe 1 passes from the water intake port 7 through the water supply pipe 9, and the clean water whose soil and sand have been removed by the strainer 10 is supplied from the water supply pipe 9 through the water supply port 8 to the balance piston chamber 3a. . Therefore, the balance piston chamber is not mixed with the sediment in running water. In addition, the water intake 7 of the nozzle pipe 1 is connected to the water supply port 8 of the balance piston chamber 3a.
If it is provided on the upstream side, the flow rate on the upstream side is slower than that on the downstream side, and the water pressure on the upstream side is higher, which is suitable for supplying pressurized water to the balance piston chamber 3a.

[0010]

According to the present invention, the water in the nozzle pipe is guided by the water supply pipe, and a strainer is provided in the middle of the water supply pipe to supply clean water from which sediment in running water is removed to the balance piston chamber. Therefore, there is no risk of soil and sand getting into the balance piston chamber. Therefore, the needle does not malfunction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a needle showing a sediment mixing prevention device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional needle.

[Explanation of Codes] 1 Nozzle pipe 2 Needle 3 Balance piston 3a Balance piston chamber 4 Needle servo motor 4a Cylinder 6a Upper rib 6b Lower rib 7 Intake port 8 Water supply port 9 Water supply pipe 10 Strainer

Claims (2)

[Claims] 1. A Pelton turbine having a built-in needle servomotor built in a nozzle pipe, wherein one end is connected to a water intake of the nozzle pipe and the other end penetrates a cylinder of the needle servomotor to form a balance piston. An apparatus for preventing sediment contamination of a Pelton turbine needle, comprising: a water supply pipe connected to a water supply port of a chamber; and a strainer inserted in the water supply pipe. 2. The sediment mixing device for a Pelton turbine needle according to claim 1, wherein the intake port of the nozzle pipe is located upstream of the water supply port of the balance piston chamber. Mixing prevention device.