JP2009155966A - Air entrainment inhibiting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air entrainment inhibiting device having a simple structure by which the air is inhibited from being entrained into the water passing through a flow passage causing a drop and flowing into a pipe line which is connected to the downstream side. <P>SOLUTION: The air entrainment inhibiting device 10 is provided with a water conduit 11 receiving all the water flowing into a stream water intake path 30. The water conduit 11 extends downward in a vertical shaft 40, then turns upward at a position lower than the position of a water surface 42 in the lower part of the vertical shaft 40, and opens the end part 12 at a position lower than the position of the water surface 42. The end part 12 of the water conduit 11 is arranged at a position higher than the position of an upper end of an inflow port 51 of a lower stream side conduit 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air mixing suppression device for suppressing water from flowing into a pipe connected to a downstream side of a flow path having a head with the inflow of water from the flow path.

  Hydroelectric power plants collect water, which is a power source for rotating a power generation turbine, from many water systems such as mountain streams through waterways.

  FIG. 5 is a cross-sectional view showing an example of a water channel 20 for taking water for power generation from a high altitude such as a mountain stream water source.

  As shown in FIG. 5, the water taken from the mountain stream passes from the mountain stream intake channel 30 extending in the horizontal direction through the shaft 40 extending vertically downward and flows into the downstream pipe 50. In such a flowing water process, when water falls in the vertical shaft 40 from the end 32 of the mountain stream intake channel 30 and reaches the water surface 42 in the vertical shaft 40, a large amount of air is mixed and mixed in the water. The air may be introduced into the power generation turbine from the downstream pipe line 50 together with the water. In that case, the air hammer phenomenon may not only damage the runner of the power generation turbine, but also reduce the power generation efficiency, so that the water introduced into the power generation turbine is not mixed with air as much as possible. desirable.

  On the other hand, conventionally, there has been disclosed a device that suppresses air contamination with respect to water flowing in a pipe that is piped through a flow path that causes a vertical drop as shown in FIG. 5 (for example, Patent Document 1).

An air mixing suppression device described in Patent Document 1 includes a tank plate having an overflow weir upstream of a vertical pipe, and a partition plate that divides the vertical pipe into a main divided flow path and a sub-divided flow path. It is installed. The upper end of this partition plate is a dam plate that dams the water flowing into the sub-divided flow channel to a certain depth in the tank, and the cross-sectional area of the main divided flow channel is the flow rate of water flowing in the main divided flow channel Is set to be smaller than the flow rate overflowing from the overflow weir of the tank body. As a result, the water overflowing from the overflow weir is accumulated in the main divided flow path of the vertical pipe so that the vertical drop is eliminated and air mixing is suppressed. The amount of air mixed can be reduced by reducing the flow rate of the water flowing and flowing into the sub-divided flow path.
Japanese Patent Laid-Open No. 11-118089

  However, in the air mixing suppression device disclosed in Patent Document 1, since it is necessary to install a tank body having an overflow dam with respect to the vertical pipe, it becomes a large-scale facility and increases the introduction cost. I'll be stuck.

  In addition, in the main divided flow channel in the vertical pipe, air mixing into the water is suppressed by making it full, but the water overflows the overflow weir in the tank and the weir material above the partition plate There is a possibility that air may be mixed into the water when flowing into the water surface blocked by the water or when the water flows over the weir plate above the partition plate and flows into the water surface in the sub-divided flow path. In addition, when the amount of water is small, it is assumed that a vortex flow is generated at the inlet of the main divided flow path. In that case, air is sucked into the main divided flow path and air is mixed into the water. As a result, water containing air may be introduced into the power generation turbine through a pipe line connected to the downstream side thereof.

  The present invention has been made in view of the above points, and air is mixed into water that passes through a flow path that causes a drop with a simple configuration and flows into a pipe connected to the downstream side thereof. An object of the present invention is to provide an air mixing suppression device capable of suppressing the above.

In order to achieve the above-mentioned object, according to the present invention, air flows from a flow path having a head into a pipe connected to the downstream side of the water as the water flows from the flow path. An air mixing suppression device for suppressing,
It is configured so that all the water flowing into the flow path flows in, extends downward in the flow path, and then turns upward or obliquely upward at a position lower than the water surface at the bottom of the flow path. It is characterized by having a water conduit that opens at a position lower than the water surface (first invention).

  According to the air mixing suppression device of the present invention, it is not necessary to provide a large facility such as a tank body or overflow weir as described in Patent Document 1 in a flow path with a head that needs to suppress air mixing. Since construction can be performed with a simple configuration, the introduction cost can be reduced.

  Further, according to the air mixing suppression device of the present invention, all the water flowing into the flow path is taken and guided to a position lower than the water surface at the bottom of the flow path, and then the flow direction is directed upward or obliquely upward. Change the position and discharge at a position lower than the water surface. As a result, even if air is mixed into the water flowing into the flow path, the water is discharged upward or obliquely upward into the water below the flow path. It is discharged to float on the water surface. Therefore, the air mixed in the water can be prevented from flowing into the pipe.

  The second invention is characterized in that, in the first invention, the end portion of the conduit pipe is opened at a position higher than the inlet of the conduit.

  According to the air mixing suppression device of the present invention, it is possible to further suppress the air discharged together with water from the end of the water conduit from flowing into the pipe from the inlet of the pipe.

  According to the present invention, an air mixing suppression capable of suppressing the mixing of air into water flowing into a pipe connected to the downstream side through a flow path that causes a drop with a simple configuration. Equipment can be provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  The air mixing suppression device 10 of the present embodiment is provided in a water channel 20 for taking water for power generation as shown in FIG. 5 from a high altitude such as a mountain stream water source.

  In the water channel 20 shown in FIG. 5, the mountain stream intake channel 30 extends in the horizontal direction, but the present invention is not limited to this, and a flow channel having a gentle gradient may be used. Further, although the vertical shaft 40 extends in the vertical direction, it may be a flow path having a steep slope in which air is mixed into the water flowing into the water surface 42.

  Also, in the drawings used for the description below, the same reference numerals are given to portions corresponding to those using the same configuration as in FIG.

  FIG. 1 is a cross-sectional view showing an installation state of the air mixing suppression device 10 according to the first embodiment in a water channel 20, and FIG. 2 is a perspective view of FIG.

  As shown in FIG. 1 and FIG. 2, the air mixing suppression device 10 is in a position lower than the water surface 42 below the shaft 40 after all the water flowing into the mountain stream intake channel 30 flows in and extends downward in the shaft 40. The water pipe 11 is opened at a position where the end 12 is lower than the water surface 42. Here, the end portion 12 of the water conduit 11 is provided at a position higher than the upper end of the inflow port 51 of the downstream side conduit 50.

  As shown in FIG. 2, at the connection portion of the mountain stream intake channel 30 with the shaft 40, a bottom plate 112 extending the bottom surface of the mountain stream intake channel 30 to the inside of the shaft 40, and an edge of the bottom plate 112 are erected. A wall plate 116 that seals the intake channel 30 is provided. A water intake hole 114 is provided in the bottom plate 112. And the upper end of the J-shaped pipe 120 bent in the J-shape is connected to the water intake hole 114.

  The J-shaped pipe 120 has a drooping portion 122 that guides water flowing from the water intake hole 114 of the bottom plate 112 downward from the water surface 42 in the shaft 40, and reverses the induced water flow upward so that the water in the lower portion of the shaft 40 is submerged. And a bent portion 124 for discharging to the outside.

  Since the air mixing suppression device 10 has such a configuration, all of the water flowing through the mountain stream intake channel 30 is blocked by the wall plate 116 and flows into the intake hole 114 of the bottom plate 112. Next, the water that has flowed into the water intake hole 114 by the J-shaped pipe 120 is guided to a position lower than the water surface 42 at the lower part of the shaft 40, and then the direction of the flow is changed upward, It is discharged into the water.

  FIG. 3 is a perspective view showing an installation state of the air mixing suppression device 100 according to the second embodiment in the water channel 20.

  As shown in FIG. 3, the air mixing suppression device 100 includes a J-shaped partition plate 130 that bends in a substantially J shape and a vertical partition plate 140. These partition plates 130 and 140 have an edge in the width direction in contact with each of the opposing inner walls 44 in the shaft 40, and an upper end of the J-shaped partition plate 130 in contact with the ceiling surface 41 of the shaft 40, so that the vertical partition plate The lower end of 140 is provided in contact with the bottom surface 43 of the shaft 40.

  Thereby, the J-shaped water guide pipe 13 surrounded by the J-shaped partition plate 130, the vertical partition plate 140, the bottom surface 43, the inner wall 44, and the inner wall 45 is formed. The tip 12 of the J-shaped water conduit 13 is designed to be higher than the upper end of the inlet 51 of the downstream pipe 50. Therefore, all the water flowing through the mountain stream intake channel 30 flows into the water conduit 13 and is guided to the lower part of the shaft 40, and then the flow is changed upward and discharged into the water.

  That is, the air mixing suppression device 100 according to the second embodiment forms the water conduit 13 using the inner surface of the shaft 40, and can form a water flow similar to that of the first embodiment. it can.

  Further, the water channel to which the air mixing suppression device 10 or 100 according to the first and second embodiments is applied is not particularly limited to a tubular flow channel, and a flow whose upper part is open as shown in FIG. The road 22 may be used.

  As described above, according to the air mixing suppression devices 10 and 100 according to the first and second embodiments, all the water flowing into the mountain stream intake channel 30 flows in and extends downward in the shaft 40, and then the shaft 40 The air is mixed into the water flowing into the shaft 40 by changing the direction upward at a position lower than the water surface 42 at the lower part 40 and having the water guide pipes 11 or 13 whose end 12 opens at a position lower than the water surface 42. Even so, since the water is discharged upward into the water below the shaft 40, the air mixed in the water is also discharged so as to rise to the water surface 42 along with the upward flow of water. Thereby, it can suppress that the air mixed in the water flows into the downstream pipe line 50.

  In addition, in the water channel 20 with a head that needs to suppress air mixing, it is not necessary to provide large facilities such as a tank body or overflow weir as described in Patent Document 1, and it can be constructed with a simple configuration. Introduction cost can be reduced.

  Further, the end 12 of the water conduit 11 or 13 is provided at a position higher than the upper end of the inflow port 51 of the downstream conduit 50, so that the water discharged from the end 12 of the water conduit 11 is removed. It can suppress more effectively that the air which mixes in flows into the downstream pipe line 50 from the inflow port 51. FIG. However, even if the end portion 12 of the water conduit 11 is provided at a position lower than the upper end of the inflow port 51 of the downstream side pipe 50, the water flowing through the water conduit 11 is discharged upward from the end portion 12 to the water. Since the mixed air is discharged so as to rise to the water surface 42 together with the upward flow of water, the effect of suppressing the air from flowing into the downstream side pipe 50 can be obtained.

  In addition, in the air mixing suppression devices 10 and 100 according to the first and second embodiments, the water guide pipe 11 or 13 extends downward in the shaft 40, and then at a position lower than the water surface 42 below the shaft 40. Although the direction is changed upward, the direction is not limited to this, and the direction may be changed obliquely upward.

  Moreover, in the air mixing suppression apparatus 10 which concerns on 1st embodiment, although the cross-sectional shape of the J-shaped pipe | tube 120 is a rectangle, not only this but a round tubular shape may be sufficient.

  Moreover, you may provide the air vent etc. for discharging | emitting the air discharge | released in the shaft in the shaft 40 in which the air mixing suppression apparatus 10 or 100 which concerns on 1st and 2nd embodiment is installed.

It is sectional drawing which shows the installation condition to the water channel 20 of the air mixing suppression apparatus 10 which concerns on 1st embodiment. It is a perspective view which shows the installation condition to the water channel 20 of the air mixing suppression apparatus 10 which concerns on 1st embodiment. It is a perspective view which shows the installation condition to the water channel 20 of the air mixing suppression apparatus 100 which concerns on 2nd embodiment. It is sectional drawing which shows the installation condition of the air mixing suppression apparatus 100 to the water channel 20 with which the downstream pipe line 50 was connected to the flow path which the head which the upper part opened | released. It is sectional drawing which shows an example of the water channel 20 for conducting water for electric power generation from a mountain stream water source to the downstream pipe line 50. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,100 Air mixing suppression apparatus 11,13 Water guide pipe 12 End part 20 Water channel 30 Mountain stream intake channel 40 Vertical shaft 42 Water surface 50 Downstream side channel 51 Inlet 112 Bottom plate 114 Intake hole 116 Wall plate 120 J character tube 130 J character partition plate 140 Vertical divider

Claims (2)

An air mixing suppression device for suppressing water from flowing into the pipe connected to the downstream side of the flow path having a head with the inflow of water from the flow path,
It is configured so that all the water flowing into the flow path flows in, extends downward in the flow path, and then turns upward or obliquely upward at a position lower than the water surface at the bottom of the flow path. An air mixing suppression device comprising a water conduit that opens at a position lower than the water surface.   2. The air mixing suppression device according to claim 1, wherein the end portion of the water conduit opens at a position higher than an inlet of the pipe.