JPS5951164A - Hydraulic machine - Google Patents

Abstract

PURPOSE:To precisely detect temperature rise in a racing runner by installing a water temperature detecting sensor in a guide vane leak discharge pipe which is the nearest, among these pipes, to a guide vane and by monitoring the water temperature. CONSTITUTION:The water leaking from a guide vane 2 sticks to the inside of the guide vane 2 on account of revolving motion of a runner. It starts revolving motion, while forming a water curtain. Though electric motor power reaches about 1 to 2% of the main engine rated power, the said revolving motion transforms the motor power into heat. A temperature sensor 6 is installed in a discharge pipe 4b which opens its end at the nearest place to the guide vane 2 in the underside range between the guide vane 2 and a runner 3 inlet. With this contrivance, the temperature rise in the runner 3 can be detected precisely even when the runner 3 is racing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field of 9th grade] This 54th page relates to hydraulic machines such as water turbines or pump water turbines that perform servo, 111 operation or pumping standby operation for a long period of time.

[Technique 11.j of 51zsu and its problems] In the case of phase adjustment operation or pumping standby operation in which the runner is idled in a conventional water turbine or pump turbine, first fully close the guide vane and close the draft tube. Normal air with a pressure slightly higher than the normal pressure was sent around the runner to remove water and perform idling operation.

At this time, since the casing (2) is filled with water, water leaks from the gap between the guide vanes to the launch side, and as the launch rotates, a rotational movement occurs between the launch (2) and the guide vanes, which causes water leakage. The hot water caused the temperature of the launch to rise, which caused the runner to expand, and there was a risk that the launch would come into contact with the fixed part in the small gaps around the runner's periphery or in the seal area.

For this reason, conventionally, the drainage hole was installed between the guide vane and the launch with a water wheel cover (= installed) to remove the hot water, and at the same time the temperature of these hot water was monitored (secondly, in order to detect the temperature rise of the launch, a water turbine cover was installed). The water temperature was detected by inserting a temperature sensor in the drain pipe. However, experiments revealed that the hot water coming from the runner's side room tended to show a lower temperature than the runner's rising temperature. However, when the runner runs idle for a long time, it is necessary to detect the lunch temperature more accurately.

[Purpose of the invention]

An object of the present invention is to provide a hydraulic machine that can safely perform idling operation such as sub-phase operation or pumping standby operation for a long time.

[Summary of the invention]

In order to achieve the above objectives (2. The hydraulic machine of the present invention:
A water temperature detection sensor is attached to the drain pipe installed at the position closest to the guide vane before the guide vane leak water is drained between the guide vane and the runner inlet, and the water temperature is monitored by the water temperature detection sensor. Let what you did be /l?a.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the state of a hydraulic machine during idle operation.

The Jf and contraction air sent around runner 3 push the water up to the regular water surface of draft chiboob 7, and the bottom is the free water surface 8.
As a result, the small gap between the guide vanes 2 and the casing 1 (2) migrates.As a way to prevent compressed air from migrating into the casing, a pressurizing valve 9 is installed in the casing to prevent compressed air from entering the casing. The water supply is constantly pressurized at a slightly higher pressure.With this method, the pressurized water that has been pressurized inside the casing passes through a small gap in the guide vane and is ejected from the launch side.

In order to drain the water leaking from the guide vane, the water is drained through a drain pipe 4a or 4b provided on the lower cover, and by opening the drain valve 5, the water is drained into the side draft pipe.

Conventionally, the temperature of this drain water was measured to monitor the rise in temperature of the runner, but the thermometer 6 was installed in the drain pipe 4al2 provided in the runner side chamber 0. By the way, water leakage from the guide vanes occurs due to the rotational movement of the run 9 as shown in Figure 2 (-), which causes a rotational movement while forming a water curtain 11 with 9 inside the guide vane. 1φ~2% of the rated output (double series, but this is the heat (
-Change. For this reason, water leaking from the guide vane is turned into hot water and drained from the drain pipe 4.

However, when measuring the temperature of the hot water at each point where it flows out, ζ(5
As shown in Figure 4, the closer it is to the kite vane, the higher the −i+
It was found by experiment (2) to record the ft. Therefore, the temperature at the drain pipe 4a shown in Figure 1 (1) was taken, and D (=j). First, this prevents accidents caused by touching the skin due to the temperature rise of the runner (the second one can be said to be i & i = "c72". The present invention eliminates this drawback and accurately detects the temperature rise of the runner. - As shown in Fig. 3 (1° 4-) <position closest to the guide vane on the F cover from the guide vane to the runner inlet (1 open L1 drain pipe 4bf-MAfJi sensor 6
The load is to provide .

[Departure! Effect of J]

As explained above, according to the present invention (2), temperature measurement can be carried out at an optimal position, and therefore it is possible to detect an increase in the accuracy of the launch during idling. In addition, by connecting this temperature detection sensor to i4, it is possible to issue an alarm or stop the machine when the temperature reaches the specified temperature. We can expect even safer driving.

[Brief explanation of drawings]

Figure 1 is a schematic diagram showing the state of a hydraulic machine during idle operation, 1
Figure 42 shows the state of water leakage from the guide vane. 1 - Partial schematic diagram of a hydraulic machine. Figure 3 is a schematic diagram showing an embodiment of the present invention. Figure 4 is the relationship between temperature ashing and temperature measurement position. FIG. 1...Casing, 2...Guide vane 3.
...Runner, 4a, 4b...Drain pipe 5a,
5b...Drain valve, 6...Temperature sensor 7...
Draft tube, 8...press down water ■9...
・Casing pressure valve, 10...Runner side chamber 11・
...Water Curtain (7317) Agent Patent Attorney Noriyuki Chika 1Right (
and 1 other person) Figure 2, Figure 3) Figure 4

Claims (2)

[Claims] (1) Hydraulic machinery that performs idling operation such as A-phase operation or pumping standby operation (between the guide vane and runner inlet). Position (2) Take the water temperature detection sensor (2) installed in the drain pipe (2) and check the water temperature (6)
2. To monitor (2) the % signs of [water-power machinery]. (2) The hydraulic machine as set forth in item 1 of the scope of the δ1-1 requirements, characterized in that it issues a general alert or stops the above-mentioned water when the water temperature reaches a certain temperature.