JPH0443869A - Detecting device for rate of opening of needle of peleton turbine - Google Patents

Abstract

PURPOSE:To detect the rate of the opening of a needle with high reliability by directly connecting a needle opening rate transmitter of high moisture resistance and high reliability to one end portion of a needle shaft so as to constitute a detecting device for the rate of the opening of the needle of a Peleton turbine. CONSTITUTION:A needle shaft 4 of short overall length is rotatably disposed inside housing 3 installed outside the nozzle pipe 2 of a Peleton turbine and the boss 5a of a connecting lever 5 is fixed to the needle shaft 4. Further the end portion 5b of the connecting lever 5 is engaged in the engagement channel of a needle and a needle opening rate transmitter 77 is directly connected to one end portion of the needle shaft 4 to form a detecting device for the rate of the opening of the needle of the Peleton turbine. The mechanism is thus simplified and the rate of the opening of the needle can be detected with high reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a needle opening detection device for a Pelton water turbine that has a so-called built-in needle servo motor that operates the needle of the Pelton water turbine.

[Conventional technology]

In Pelton turbines, when the flow rate of the turbine changes, the opening degree of the needle is adjusted by opening and closing the needle using a servo motor in order to operate the turbine with good efficiency. At this time, the needle opening degree is detected by the needle opening degree detection device, and the needle opening degree is controlled so that the needle opening degree is adjusted to the water turbine flow rate and becomes an appropriate needle opening degree.

This type of conventional needle opening detection device will be explained based on FIGS. 4 to 7. FIG. 4 is a diagram showing a conventional needle opening detection device, and is a sectional view corresponding to the GG section in FIG. 5 and the HH section in FIG. 6, which will be described later. Side view seen from E, Figure 6 shows Figure 4 with arrow F-F
FIG. 7 is a plan view of FIG. 5 as viewed from arrow J. In these figures, 1 is a needle with a built-in servo motor, and the 4th needle is driven by a servo motor (not shown).
It moves within the nozzle pipe 2 of the Pelton water turbine along the moving direction axis 1a shown in the figures to FIG. 6, and is opened and closed. A needle shaft 10 is rotatably disposed in a housing 9 installed outside the nozzle pipe 2 on an axis 10a orthogonal to the axis 1a in the moving direction of the needle l. The boss 5a of the connecting lever 5 is connected to the key 6 at one end of the needle shaft 10.
The distal end portion 5b of the connecting lever 5 is engaged with the retaining groove 1b of the needle 1. Needle shaft 1
0 protrudes outward through the water turbine housing 8, and the other end is supported by a bearing device 11 consisting of a ball bearing, a needle shaft bearing, a 11!1 plate, a bearing cover, etc., and a lever is attached to the tip of the other end. 12 is installed. As shown in FIGS. 5 and 7, a needle opening transmitter 13 is installed near this, and the operating lever 13a of the needle opening transmitter 13 is connected to the lever 12 via a connecting rod 14. do,
A rotation transmission mechanism 15 that transmits the rotation of the needle shaft 10 to the needle opening transmitter 13 is configured.

When the needle 1 moves along the moving direction axis 1a, the connecting lever 5 whose tip end 5b is engaged with the engagement groove 1b of the needle 1 rotates together with the needle shaft 10, and the rotation of the needle shaft 10 causes the lever 12. The operating lever 13a is operated via the connecting rod 14, and the needle opening transmitter 13 detects and transmits the needle opening corresponding to the amount of movement of the needle 1. At this time, as explained above, the needle opening degree is detected by the needle opening degree transmitter 13, and the needle opening degree is controlled by the needle servo motor built in the needle so that the needle opening degree is appropriate for the flow rate of the water turbine. control.

[Problem to be solved by the invention]

In the conventional needle opening detection device described above, the needle opening transmitter 13 is installed outside the water turbine housing 8 due to reliability problems such as insufficient moisture resistance. For this purpose, the needle shaft IO penetrates the water turbine housing 8 and protrudes outward, and the bearing device 11. Since parts such as the lever 12° connecting rod 14 are used, manufacturing and assembly costs are high, and reliability is reduced because the needle opening transmitter 13 is operated through many parts. was there.

The present invention solves the problems of the conventional needle opening detection device and uses a recently emerged moisture-resistant and highly reliable needle opening transmitter, i.e., the needle opening at the end of the needle shaft. The object of the present invention is to provide a needle opening detection device for a Pelton water turbine that has a simplified configuration by directly connecting an opening transmitter and omitting a bearing device and a rotation transmission mechanism.

[Means to solve the problem]

Said gll! In order to solve this problem, the present invention has a built-in servo motor for operating the needle in the needle for adjusting the flow rate of the nozzle of a Pelton water turbine. A needle shaft for detecting the opening of the needle disposed therein, a connecting lever having a boss fixed to one end of the needle shaft and whose tip end is engaged with an engagement groove of the needle, and the needle shaft other than the needle shaft. In a Pelton water turbine needle opening detection device equipped with a needle opening transmitter installed via a rotation transmission mechanism connected to the end, the needle opening transmitter is installed on the outside of the nozzle pipe of the Pelton turbine. shall be located within the housing.

[Effect]

In the present invention, a needle shaft with a short overall length is rotatably arranged in a housing installed on the outside of a nozzle pipe of a Pelton water turbine, and a boss of a connecting lever is fixed to this needle shaft.
The tip of this connecting lever is engaged with the engagement groove of the needle, and a needle opening transmitter is directly connected to one end of the needle shaft, thereby configuring the needle relationship detection Wl of the Pelton water turbine. The opening/closing movement of the needle involves rotating a needle shaft to which a connecting lever is fixed, and a moisture-resistant, highly reliable needle opening transmitter that is directly connected to this needle shaft.The mechanism is therefore simplified and the needle can be opened with high reliability. degree is detected.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a needle opening detection device for a Pelton water turbine according to the present invention will be described with reference to FIGS. 1 to 3. Figure 1 shows a needle opening detection device for a Pelton water turbine according to an embodiment of the present invention! Cross section CC in Figure 2 and D-D in Figure 3, which will be described later as a diagram showing
2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a plan view of FIG. 1 taken along the arrow B-B.

The difference between the conventional example and the embodiment of the present invention is that in this embodiment, a needle shaft with a short overall length is provided, and a needle opening transmitter is directly connected to one end of this needle shaft. The reason is that the mechanism for detecting the opening degree has been simplified. That is, 1 is a needle with a built-in servo motor, which is moved within the nozzle pipe 2 of the Pelton water turbine along the moving direction axis 1a shown in FIGS. 1 to 3 by the servo motor (not shown), and is opened and closed. A moving direction axis 1 of the needle 1 is disposed in a housing 3 installed on the outside of the nozzle pipe 2.
A needle shaft 4 having a short overall length is rotatably disposed on an axis 4a orthogonal to the needle a. A boss 5a of a connecting lever 5 is fixed to the needle shaft 4 via a key 6, and a tip end 5b of the connecting lever 5 is engaged with a retaining groove 1b of the needle 1. A needle opening transmitter 7 is directly connected to one upper end of the lever shaft 5, which has better moisture resistance and reliability than conventional products, and does not require frequent maintenance. This allows the needle shaft to be connected to the water turbine housing 8 as in the conventional device.
There is no need to protrude through the needle, and a bearing device and a rotation transmission mechanism are omitted, thereby creating a needle opening detection device for a Pelton water turbine with a simplified configuration.

When the needle 1 moves along the moving direction axis 1, the connecting lever 5 whose tip end 5b is engaged with the engagement groove 1b of the needle 1 rotates together with the needle shaft 4 and is directly connected to the needle shaft 4. The needle opening transmitter 7 also rotates to detect and transmit the needle opening. At this time, as explained above, the needle opening degree is detected by the needle opening degree transmitter 7, and the needle opening degree is controlled by the needle servo motor built in the needle so that the needle opening degree is appropriate for the water turbine flow rate. control.

The needle opening detection device according to the embodiment of the present invention has a short needle shaft and the needle opening transmitter is directly connected to it. However, since it is not necessary to provide a bearing device or a rotation transmission mechanism to rotate the needle opening degree transmitter, the configuration can be simplified and reliability can be improved.

〔Effect of the invention〕

In the present invention, a needle shaft with a short overall length is rotatably arranged in a housing installed on the outside of a nozzle pipe of a Pelton water turbine, and a boss of a connecting lever is fixed to this needle shaft.
The tip of this connecting lever is engaged with the engagement groove of the needle, and a moisture-resistant, highly reliable needle opening transmitter is directly connected to one end of the needle shaft to detect the needle opening of the Pelton water turbine. Because of the structure of the device, the mechanism is simpler than the conventional device, and the needle opening degree can be detected with high reliability. This can significantly reduce device manufacturing and maintenance costs.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a needle opening degree detection device for a Pelton water turbine according to an embodiment of the present invention. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a plan view of FIG. 1 viewed from arrow B-B, and FIG. 5 is a side view of FIG. 4 taken from arrow E, and FIG. 6 is a side view of FIG. 4 taken from arrow F-F. FIG. 7 is a plan view of FIG. 5 as seen from arrow J. 1: Needle, 1B=Axis of movement direction, 1b: Engagement groove, 2
: Nozzle pipe, 3.9: Housing, 4.10: Needle shaft, 4a, 10a: Axis line, 5: Connection lever 5
a: boss, 5b: tip, 7, 13: needle opening transmitter, 8: water turbine housing, 11: bearing device, 15: rotation transmission mechanism,

Claims (1)

[Claims] 1) A servo motor for operating the needle is built into the needle for adjusting the flow rate of the nozzle of a Pelton turbine. Detection of the opening of a needle rotatably disposed on an axis perpendicular to the axis of movement of the needle with a built-in servo motor. a connecting lever having a boss fixed to one end of the needle shaft and whose tip is engaged with an engagement groove of the needle; and a rotation transmission mechanism connected to the other end of the needle shaft. A needle opening detection device for a Pelton water turbine equipped with a needle opening transmitter installed through the needle opening transmitter is characterized in that the needle opening transmitter is disposed in a housing installed on the outside of the nozzle pipe of the Pelton turbine. Needle opening detection device for Pelton turbine.