JPS5923084A - Water sealing apparatus for multi-stage hydraulic machine - Google Patents

Abstract

PURPOSE:To enable to accomplish water sealing completely and to reduce the shaft vibration of a hydraulic machine, by arranging water sealing packings in a plurality of stages. CONSTITUTION:High-pressure sealing water in a collector chamber 19 is drawn out via a nonc-contact type labyrinth 24 disposed around the outer peripheral portion of a main flange of an upper cover 11, a water drain port 21 formed in the collector chamber 19, drain pipe 22 and a control valve 23 provided in addition to conventional packings 16-1-16-3, and its pressure is reduced. Thus, since the pressure P1 of water in the collector chamber 19, serving as the second-stage sealing water, is lowered, perfect water sealing effect can be obtained by providing a smaller number of water sealing means 16-1-16-3 than the conventional arrangements. Further, since the labyrinth 24 is disposed around the outer peripheral portion of a flange of a main shaft 1, the distance between a main bearing 4 and an upper-stage runner 2 is not increased, so that the shaft vibration can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water sealing device for a multistage hydraulic machine, and more particularly to a water sealing device for a multistage hydraulic machine in which the water sealing pressure in the higher stage is high.

Figure 1 is a cross-sectional view of a conventional two-stage pump turbine, and Figure 2 is a cross-sectional view of a conventional two-stage pump turbine.
■ [Detailed view of the figure is shown.

In Figure 1, the water led to the upper pond is placed in the casing 5. Upper guide bay 76. It passes through the second-stage runner 2 and transmits about half of the energy of the body to the second-stage runner 2 to the main shaft 1. Furthermore, water iJ: is passed through the return vane flow hrg7 to the lower guide vane 8. Guided by lower runner 3,
The remaining energy is transferred to the main shaft 1, and the draft pipe 9. It passes through the draft tube LO and is released into the lower pond.

In the L-shaped two-stage pop turbine shown in Figure 1, it is customary for the upper runner 2 and the lower runner 3 to share the load by half, and even downstream of the upper runner 2, the fluid is distributed at least 1/2 of the working head. With 〇, the runner back pressure chamber 20 and collector chamber 19 are under high pressure, and the maximum head is 10
00 m class two-stage pop turbine c, 11, colleter room 1
The pressure of No. 9 is 6.00 mAq (60 KQ/cm 2 ) or more. this? Water sealing of the fixed part and rotating part of the f-body is performed in the backing box 12 by 1 degree. As shown in FIG. 2, the conventional water sealing device includes a backing box 12. Outer distance 13° cover 14. (Multi-stage inner diameter distance) l 5-1 to 15-2. Multiple stage water seal packing 1G-1 to 1.6-4. Water supply pipe 17. Mizukiri p18. Consists of a collector chamber 19, with a water-sealing backing 1 at the bottom
Fresh water at a pressure higher than the pressure P1 of the collector chamber 19 is supplied from the upper part of the collector chamber 6-4 through the water supply pipe 19 to provide a water sealing effect. Fresh water flows in the direction of the arrow and is discharged into the atmosphere and downstream. One layer of conventional water-sealing backing)
There is a limit to the water sealing capacity of 600 mAq as mentioned above.
In order to seal the above-mentioned water head, it is necessary to install several stages of water sealing backing, which is extremely expensive and requires a clean water supply pump (not shown) and piping system to be installed in the collector room 19. Pressure l)I I need something with a much higher pressure.9
However, it had the disadvantage of being very expensive. Furthermore, since it is necessary to provide several stages of water sealing backing, there is a fatal defect in that the distance between the main bearing 4 of the water turbine and the upper stage runner 2 becomes narrow, increasing the shaft vibration 1vh.

An object of the present invention is to provide a hydraulic machine that can reliably seal water using several stages of water-sealing backing and has less shaft vibration.

The main point of the present invention is that the pressure sealing of the pressure stage part of a multistage hydraulic machine is mainly carried out by the labyrinth provided on the outer periphery of the IQI+ flange, water is drained from the downstream of the labyrinth, pressure is applied, and then several stages It is possible to completely water the iF with a water-sealing backing similar to that of conventional technology. The goal is to obtain a water sealing device that is long-lasting, inexpensive, and safe.

Figure 3 t'' is a sectional view of the water sealing system (direct view) without showing an embodiment of the present invention.
, -, 1: A labyrinth 24 is provided on the main surface of the cover 11 facing the main body 1, and a drain hole 21 is provided in the collector chamber 19.
Drainage arrangement 22. This is the point where the adjustment valve 23 is added and the Schierke is made into two stages. However, the pressure in the collector chamber 19 (I,
11. Maximum head 1 (] OO + n class pump turbine, 6
00 mA (), but the high pressure passes through the non-contact labyrinth '24 in the first stage and drains through the drain hole 2.
1. Drainage piping 22. By draining water through the regulating valve 23, the pressure P1 in the collector chamber 19 is reduced as a second stage of water sealing.
The pressure can be reduced, and a more complete water sealing effect can be obtained by installing a water sealing device h1 with the same number of stages as the conventional one or with an even smaller number of stages.

Since the additional labyrinth 24 is installed 64 around the periphery of the franchisor 1 of the main shaft 1, the distance between the main bearing 4 and the first-stage runner 2 is not too large, and shaft vibration can be greatly reduced.

Second, since the pressure P1 in the collector chamber 19 is reduced, the water supply pressure P3 of the VIt water can also be reduced, and a high-pressure pump becomes unnecessary. Water supply ft fresh water and collector room 19. The flow of water in the back pressure chamber 22 is controlled by adjusting the opening degree of the lυ adjustment valve 23 as shown by the arrow! By adjusting the pressure P1 in the collector chamber 19, the pressure P1 can be arbitrarily adjusted.

As shown in FIG. 4, by connecting the piping 22t to the downstream drain pipe 9 of the lower runner 3, it is not necessary to install a drainage pump for draining water.

Note that 4 in the figure is the main bearing.

According to the present invention, the pressure in the collector chamber is reduced, and even at the highest stage of a high-pressure multi-stage hydraulic machine, the capacitor is the same as the conventional one.
F. It is possible to completely seal water in a number of stages less than that.

In addition, b12Thil& between the main bearing and the second stage runner is reduced, and a multistage hydraulic machine with less shaft vibration can be obtained.

Figure 17i of the drawings 1/(, Explanation Figure 1 is the conventional 2) Longitudinal cross-sectional view of the water pump water 31i, Figure 2
Part 11 of Figure 1, detailed Al1 figure, and Figure 3 are the water sealing device M of implementation 1911 of the present invention? , and FIG. 4 is a partial sectional view of a two-stage pump water turbine according to an embodiment of the present invention.

16-1 to 16-4...water sealing backing, 22...
Nuki, 11th scolding, 7 Figure 2 Mouthful 3rd ＼ 2nd 4th mouth

Claims (1)

[Claims] 1. A multi-stage hydraulic machine in which a water sealing device for a rotating part is installed at the top of the uppermost stage, characterized in that a water drainage pipe is provided from the middle part of the non-contact type labyrinth and the contact type water sealing backing. A water sealing device for a multistage hydraulic machine according to claim 1, characterized in that the drainage pipe is connected to a downstream draft pipe of a lowermost lunch. 3. A water sealing device for a multi-stage hydraulic mechanism as set forth in item 1 of the scope of Patent I'i, characterized in that the non-contact type labyrinth is provided on the outer periphery of the flange of the main shaft.