JPH01142271A - Jet pipe for pelton wheel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to an ejection pipe of a Pelton water turbine, and particularly to a Pelton water turbine in which the inflow flow rate can be adjusted by adjusting the opening of the water port. Regarding the ejection pipe.

(Prior art and its problems) Generally, a needle is installed inside the ejection pipe so as to be movable in the axial direction, and this needle is driven by a servo motor.
A Pelton turbine jet pipe is known in which the flow rate can be adjusted by adjusting the water opening between the needle and the nozzle.

By the way, there are two types of servo motor installation methods for this type of ejection pipe: an external type in which the servo motor is placed outside the ejection pipe, and an internal type in which the servo motor is placed inside the ejection pipe. Proposed.

FIG. 3 shows an external type ejection pipe. A jet pipe outer shell 32 is provided inside the housing 31 of the Pelton turbine, and a needle 34 is provided inside the jet pipe outer shell 32 via a long needle stem 33. It is driven by a servo motor 36 provided.

According to this method, since the servo motor 36 is installed outside, its maintenance and inspection are easy, but a large work space 37 is required to pull out the needle stem 33 in the direction of the arrow during maintenance and inspection. , there is a problem that a large floor area of the building is required, which increases the construction cost of the building.

No. 4- shows an internal type ejection pipe. This ejection pipe is
A needle 34 is provided within the ejection tube outer shell 32;
It is equipped with a servo motor 36 for moving the.

According to this method, the problem of work space as described above is solved, but the servo motor 3 is installed inside the jet pipe outer shell 32.
6, it is not easy to perform maintenance and inspection, and there is a problem that fluid friction increases and the efficiency of the water turbine decreases.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to provide a Pelton water turbine that can be easily maintained and inspected without requiring a large amount of work space, and that does not reduce the efficiency of the water turbine. Our purpose is to provide spout pipes.

[Structure of the invention]

(Means and Effects for Solving the Problems) In order to achieve the above object, the present invention fixes the needle inside the outer shell of the ejection pipe, and fixes the needle to the outer shell of the ejection pipe so that it can move in the axial direction. According to the present invention, the nozzle is fitted onto the outer shell of the ejection pipe, and the opening degree of the water port can be adjusted by driving the nozzle with a servo motor. By moving the needle in the axial direction via a servo motor, the opening degree of the water port between the needle and the nozzle is adjusted.

(Embodiment) Hereinafter, an embodiment of the ejection pipe of a Pelton turbine according to the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 indicates a housing of a Pelton turbine, and a jet pipe outer shell 2 is fixed to this housing 1. A needle stem 5 is supported inside the jet tube outer shell 2 via a needle support 3, and a needle 6 is fixed to the tip of the needle stem 5.

Further, a nozzle 7 is fitted on the outside of the jet tube outer shell 2 so as to surround the needle support 3, and a gasket 8 is interposed between the nozzle 7 and the needle support 3 to prevent water leakage. ing. A servo motor 10 is connected to the nozzle 7 via a rod 9. The servo motor 10 may be operated by either an electric or hydraulic type, and is fixed to the outer circumferential wall of the jet tube outer shell 2.

Here, a water port 11 is formed at the tip of the nozzle 7, and the tip of the needle 6 faces the water port 11, and the nozzle 7
By moving the servo motor 10 in the axial direction, the opening degree of the water port is adjusted.

However, in the conventional jet pipe, the opening degree of the water opening was adjusted by moving the needle in the axial direction, but according to this embodiment, the opening degree of the water opening was adjusted by moving the nozzle in the axial direction. In addition, the ejection pipe itself can be made compact, and maintenance and inspection become easier as will be described later.

Next, a procedure for disassembling the ejection pipe according to this embodiment will be explained.

Disconnect the nozzle 7 and the servo motor 10, and
is pulled out from the jet tube outer shell 2. Thereafter, the needle 6 is removed from the needle support 3. Disassembly is extremely easy;
Moreover, unlike the conventional method, there is no work such as pulling out a long needle stem, so much work space is not required for disassembly.

Furthermore, since the servo motor 10 is an external type, maintenance and inspection can be easily performed from inside the housing 1.Furthermore, the servo motor 10 can be disassembled by simply separating the rod 9 and nozzle 7, and other components can be removed. It can be easily done without disassembly.

FIG. 2 shows another embodiment of the invention. here,
A configuration is shown in which the servo motor 10 is fixed to the outer wall of the housing 1 when the jet tube outer shell 2 does not have sufficient rigidity and cannot sufficiently support the servo motor 10. The housing 1 of the Pelton turbine is rigid and the servo motor 1
0 can be sufficiently supported, and thereby the same effects as those described above can be obtained.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, since the servo motor is an external type, maintenance and inspection are extremely easy.Furthermore, since the needle is fixed and the nozzle is movable, it is not possible to maintain the servo motor as compared to the conventional one. This eliminates the need to pull out a long needle stem during disassembly, resulting in less work space being required for disassembly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the jet pipe of a Pelton water turbine according to the present invention, FIG. 2 is a vertical cross-sectional view showing another embodiment of the jet pipe of a Pelton water turbine according to the present invention, and FIG. 3 is a conventional FIG. 4 is a longitudinal sectional view showing a conventional internal type ejection pipe. DESCRIPTION OF SYMBOLS 1...Housing, 2...Ejection pipe outer shell, 5...Needle stem, 6...Needle, 7...Nozzle, 1
0... Servo motor, 11... Water mouth. Applicant's agent Yuta Sato 2 Figure

Claims (1)

[Claims] 1. Fix the needle inside the outer shell of the ejection tube, and
An ejection pipe for a Pelton water turbine, characterized in that a nozzle is fitted onto the outer shell of the ejection pipe so as to be movable in the axial direction, and the nozzle is driven by a servo motor to adjust the water opening degree.