JP3386492B2 - Valve turbine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve turbine, and more particularly to a valve turbine provided with a heat exchanger for cooling a bearing and a generator coil incorporated in a casing inner cylinder of the valve turbine. Related to valve turbines. [0002] A valve turbine comprises a casing inner cylinder and a casing outer cylinder which supports the casing inner cylinder.
A water wheel axle, a bearing, a generator, an oil head for opening and closing the runner blades, and the like are installed in the casing inner cylinder. Since the bearing and the generator coil built in the casing inner tube generate heat during operation of the valve wheel, a cooling device for cooling them is provided in the valve wheel. FIG. 5 shows a conventional valve turbine provided with a cooling device. A bearing 2 and a generator coil cooler 3 are installed inside a casing inner tube 1. The running water taken from the water inlet 4 of the water turbine channel by the water supply pump 5 is sent to the strainer 6 to remove dust and the like. Part of the water that has passed through the strainer 6 is the casing inner cylinder 1.
After flowing into the generator coil cooler 3 to cool the generator coil, the remainder flows into the bearing oil collecting tank 7, cools the bearing oil in the tank 7, and is discharged from the drain port 8. The cooled bearing oil in the oil collecting tank 7 is sent out to the bearing 2 by the oil pump 9 to cool the bearing 2. The above-described water supply pump 5 and strainer 6 are shown outside the casing inner cylinder 1 in FIG. 5, but are actually arranged inside the casing inner cylinder 1. However, since the inside of the casing inner cylinder 1 is very narrow and various members such as a water wheel axle, bearings, a generator and an oil head are built in, the space for installing the water supply pump 5 and the strainer 6 is reduced. There is a problem that it is very difficult to secure inside. Further, if a large amount of foreign matter such as earth and sand is mixed in the running water taken from the intake port 4, the strainer 6 is clogged at an early stage, and when the running water is acidic water, the cooling equipment is deteriorated at an early stage. There is also the problem of doing. FIG. 6 shows a valve turbine provided with a cooling device which solves the above-mentioned problem of the valve turbine. A heat exchanger 12 is provided in a water passage 11 between a casing inner cylinder 1 and a casing outer cylinder 10. Are located. Specifically, the heat exchanger 12
Is arranged on the downstream side of the valve turbine as shown in FIG. 6, or is arranged near the water intake 13 on the upstream side of the valve turbine. The heat exchanger 12 cools the secondary cooling water by flowing water in the water channel 11, and the secondary cooling water is supplied to the inside of the casing inner cylinder 1 by the circulating pump 14 to cool the bearings and the generator coils and the like. After that, it is circulated to the heat exchanger 12. The valve turbine provided with a cooling device having such a configuration is as follows.
Since the water supply pump 5 and the strainer 6 shown in FIG. 5 are unnecessary, and the heat exchanger 12 is disposed outside the casing inner cylinder 1, that is, in the water passage 11, there is a problem of securing a space for the casing inner cylinder 1. Will be resolved. In addition, waterway 11
The running water only cools the heat exchanger 12 as the primary cooling water, and the secondary cooling water supplied to the casing inner cylinder 1 can use fresh water. No deterioration occurs. [0007] However, the valve turbine using the heat exchanger is uneconomical in that the piping connecting the heat exchanger and the casing inner tube is long and uneconomical.
Since this pipe is deformed by receiving a large water pressure during the operation of the valve turbine, there is a problem that the design must be made in consideration of the influence of such pipe deformation. Therefore, an object of the present invention is to provide a valve turbine that can sufficiently shorten the pipe connecting the heat exchanger and the casing inner cylinder. [0008] In order to achieve the above object, the present invention relates to a method of connecting a casing inner cylinder and a casing outer cylinder, each of which is arranged at a predetermined interval along a flow direction of flowing water. In the valve turbine provided with the inspection shaft and the stay vane, a heat exchanger for cooling the secondary cooling water sent from the inside of the casing inner cylinder, and a pair of the heat exchangers spaced apart from each other and provided substantially along the flow direction. A rectifying plate, comprising a pair of rectifying plates forming a heat exchanger chamber in which the heat exchanger is arranged, together with the inspection shaft and the stay vane, and an upstream end portion of each of the rectifying plates, An inlet for introducing the flowing water into the heat exchanger chamber is provided, and a downstream end of each of the straightening plates forms a small gap with an outer peripheral side wall of the stay vane disposed downstream. And extending along the outer peripheral side wall of the stay vane. In this configuration, it is desirable that the heat exchanger is attached to an outer peripheral wall of the casing inner cylinder. Further, the inspection shaft has a cylindrical shape, and a wall of the inspection shaft facing the heat exchanger chamber is provided with an opening and closing for allowing a worker to pass between the inside of the inspection shaft and the heat exchanger chamber. Preferably, a door is provided, and a removable bottom plate is provided below the opening and closing door inside the inspection shaft. The flowing water flowing through the water passage between the casing inner cylinder and the casing outer cylinder flows into the heat exchanger chamber formed by the inspection shaft, the stay vane, and the pair of straightening plates. The secondary cooling water of the heat exchanger is cooled. The cooled secondary cooling water is sent out into the casing inner cylinder, and cools internal devices. Since the heat exchanger is disposed between the inspection shaft and the stay vane, the piping connecting the heat exchanger to the casing inner cylinder can be greatly reduced. FIG. 1 shows an embodiment of a valve turbine according to the present invention, in which the same parts as those in FIGS.
This will be described with reference to FIGS. In FIG. 1, an inspection shaft 15 and a stay vane 16 connect the casing inner cylinder 1 and the casing outer cylinder 10, whereby the casing inner cylinder 1 is supported by the casing outer cylinder 10. A guide vane 17 is disposed downstream of the stay vane 16, and a runner 18 is located downstream of the guide vane 17. The heat exchanger 12 is mounted on the outer peripheral wall of the casing inner cylinder 1. The heat exchanger 12 is mounted at a position between the inspection shaft 15 and the stay vane 16 arranged along the flowing direction A of the flowing water. Stipulated. FIG. 2 clearly shows the mounting position of the heat exchanger 12, and a pair of straightening plates 19 and 20 along the flow direction A are arranged between the inspection shaft 15 and the stay vanes 16. These current plates 1
The reference numerals 9 and 20 extend from the outer peripheral surface of the inspection shaft 15 to the outer peripheral surface of the stay vane 16 so as to sandwich the inspection shaft 15 and the stay vane 16, and form a heat exchanger chamber 21 together with the inspection shaft 15 and the stay vane 16. The heat exchanger 12 is located in the heat exchanger room 21. The rectifying plates 19 and 20 have one ends 19a and 20a.
Is fixed to the outer peripheral side wall of the inspection shaft 15 and the other end 19 is
b, 20b extend along the outer peripheral side wall of the stay vane 16. Flowing water inlets 22 and 23 having a screen structure are formed near one ends 19a and 20a of the flow straightening plates 19 and 20, and inlet protrusions 24 and 25 are provided at downstream ends of the flowing water inlets 22 and 23, respectively. It protrudes along the road.
In addition, a relatively small gap 2 is provided between the other ends 19 b and 20 b of the current plates 19 and 20 and the outer peripheral side wall of the stay vane 16.
6, 27 are formed. A partition wall 28 is provided between the heat exchanger 12 and each of the rectifying plates 19 and 20, and the partition wall 28 substantially prevents flowing water flowing into the heat exchanger chamber 21 from flowing water inlets 22 and 23. And serves to circulate all the heat through the heat exchanger 12. Further, as shown in FIG. 3, a partition wall 29 is also provided between the upper surface of the heat exchanger 12 and the inspection shaft 15. Next, the operation of this embodiment will be described. A part of the flowing water flowing through the water channel 11 between the casing inner cylinder 1 and the casing outer cylinder 10 flows into the heat exchanger chamber 21 from the flowing water inlets 22 and 23. Substantially all of the flowing water flowing into the heat exchanger chamber 21 flows through the heat exchanger 12 by the partition walls 28 and 29, and the heat exchanger 1 as primary cooling water.
After heat exchange with the secondary cooling water in 2 and cooling of the secondary cooling water, it flows out of the heat exchanger chamber 21 through the gaps 26 and 27. The flowing water that has flowed out of the heat exchanger chamber 21 merges with the flowing water that has not flowed into the heat exchanger chamber 21 to form the guide vanes 1.
After the runner 18 is rotationally driven through the, the water is discharged to the water discharge channel. The introduction projections 24 and 25 are provided so as to intersect with the flowing direction of the flowing water,
Guide to 2,23. In addition, the flowing water that has undergone heat exchange
6 and 27, the flow velocity increases and a pressure drop occurs here, so that a large pressure difference is generated between the flowing water inlets 22, 23 and the gaps 26, 27, whereby the flow velocity of the primary cooling water is reduced by the heat exchanger. 12 can be sufficiently cooled. The secondary cooling water in the heat exchanger 12 is
Sent out to cool the internal equipment. Since the heat exchanger 12 is directly mounted on the outer wall of the casing inner cylinder 1, the pipe connecting the heat exchanger 12 and the casing inner cylinder 1 is extremely short as compared with the conventional valve turbine of FIG. Since the heat exchanger 12 is located in the running water, foreign matters and the like in the running water are easily attached thereto, so that cleaning and maintenance are required relatively frequently. Therefore, a second embodiment in which cleaning and maintenance of the heat exchanger 12 can be easily performed will be described below. In FIG. 4, an opening / closing door 30 is attached to a portion facing the heat exchanger 12 on the outer peripheral wall of the cylindrical inspection shaft 15. A removable bottom plate 31 is installed below the opening / closing door 30 inside the inspection shaft 15. At the time of cleaning or maintenance of the heat exchanger 12, the bottom plate 31 is attached. The worker who has entered the inspection shaft 15 can get on the bottom plate 31, enter the heat exchanger room 21 from the opening / closing door 30, and perform cleaning and maintenance of the heat exchanger 12. As is apparent from the above description, according to the present invention, the heat exchanger is disposed in the heat exchanger chamber formed by the inspection shaft, the stay vane, and the pair of straightening plates. The length of the pipe connecting this heat exchanger and the casing inner cylinder can be made extremely short, thereby reducing the cost of the cooling device for the valve turbine and, at the same time, reducing the deformation of the pipe due to water pressure. There is no need to consider the design, and the work of designing the cooling device can be simplified.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a first embodiment of a valve turbine according to the present invention. FIG. 2 is a plan view showing a main part of the first embodiment in a partial cross section. FIG. 3 is a schematic view showing a part of the first embodiment. FIG. 4 is a sectional view showing a second embodiment of the valve turbine according to the present invention. FIG. 5 is a schematic diagram showing a conventional valve turbine provided with a cooling device. FIG. 6 is a schematic view showing another conventional valve turbine provided with a cooling device. [Description of Signs] 1 Casing inner cylinder 10 Casing outer cylinder 12 Heat exchanger 15 Inspection shaft 16 Stay vane 19 Rectifier plate 20 Rectifier plate 21 Heat exchanger room

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F03B 1/00-11/08

Claims (1)

(57) [Claim 1] A valve having an inspection shaft and a stay vane arranged at predetermined intervals along a flow direction of flowing water for connecting a casing inner cylinder and a casing outer cylinder. A water turbine, comprising: a heat exchanger for cooling secondary cooling water sent from the inside of the casing inner cylinder; and a pair of straightening plates spaced apart from each other and provided substantially along the flow direction, the inspection shaft comprising: And a pair of rectifying plates forming a heat exchanger chamber in which the heat exchanger is arranged, together with the stay vanes. At the upstream end of each rectifying plate, the running water is introduced into the heat exchanger chamber. The downstream end of each of the straightening vanes is provided on the outer peripheral side wall of the stay vane so as to form a small gap with the outer peripheral side wall of the stay vane arranged on the downstream side. Valve water wheel, characterized in that extending I.