JP2006307523A - Water tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently remove mixing air in a downstream pipe, without enlarging a scale of the whole tank, in a water tank such as a division work of agricultural water. <P>SOLUTION: A vertical pipe 5 with a spiral guide passage having a pipe body 51 for arranging an outflow port 51b in a lower end part for opening the upper end, a central cylinder 52 extending in the vertical direction along the axis of the pipe body 51, and a guide plate 53 formed in a spiral shape on an outer peripheral surface of the central cylinder 52, is arranged inside a tank body 2, and mixing of the air in a flowing-down water flow is restrained by allowing inflow water flowing in the tank body 2 to flow down while turning in a spiral shape by the vertical pipe 5 with the spiral guide passage. The air mixed in the water flow flowing down in the vertical pipe 5 with the spiral guide passage, is released to an upper part of the water tank 1 by the central cylinder 52. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water tank such as a diversion work (a water diversion tank) such as agricultural water, water and sewage, and industrial water.

  In recent years, with the development of pipelines for agricultural waterways and the like, an open type system is often adopted for the waterway system due to various advantages. In the open-type water supply channel system, for example, a water diversion work (pressure adjustment stand) for distributing water is arranged in a stepped manner at a required point according to a drop on a route, a section distance, and the like.

  For example, as shown in FIG. 8, a weir (crest) 302 is provided inside the water tank 301, and the weir 302 that has flowed into the water tank 301 from the inflow pipe 303 is overflowed (overflow). Therefore, an overflow type water diverter that adjusts (regulates) the amount of water supplied to the downstream pipe 304 is often used.

  In such an overflow-type water diversion work, there is a problem that air is mixed (entrained) into the downstream pipe line by bubbles generated in still water due to the falling water vein.

  Here, in the land improvement project plan design standard / design “pipeline” standard document / technical manual (1998) supervised by the Ministry of Agriculture, Forestry and Fisheries, the improvement plan of the land improvement project In some areas, the occurrence of air jumps and pulsation reduction due to the formation of air masses is observed, and it is impeded that stable water supply is disturbed. ing.

  In the overflow type diversion work, as a method for preventing air from entering the downstream pipe, as shown in FIG. 8, the distance (tank length) L from the weir 302 to the outlet 301b is set to L = 4D to 5D. As (D: inner diameter of the outflow pipe), an air trap is provided in the water tank 301 and an air vent pipe 305 for removing air mixed in the downstream pipe 304 is employed.

  In addition, as a structure for preventing air from entering the downstream pipe line, in Patent Document 1, an air accumulation tank is connected to the inflow water tank via a connection pipe, and the connection between the inflow water tank and the connection pipe is connected to the air accumulation tank. There has been proposed an air evacuation device having a structure in which the distance to the downstream wall is at least four times the diameter of the main pipe (downstream pipe line).

Furthermore, in Patent Document 2, an air collecting tank having a cross-sectional area larger than the cross-sectional area of the discharge pipe and having an open upper part is provided between the falling inflow water tank and the discharge pipe in the upstream water tank, and the falling inflow By connecting the water tank and the air accumulation tank with a connecting pipe having a cross-sectional area larger than that of the discharge pipe, air bubbles mixed in the water flowing into the falling inflow water tank are eliminated within the area of the water diversion device. A water splitting device has been proposed.
JP 2000-096647 A JP 2000-192442 A

  However, in the water diversion work having the structure shown in FIG. 8, it is necessary to increase the tank length L in order to effectively prevent air mixing, and the scale of the water tank becomes large. Moreover, although the air vent pipe which excludes the air mixed in in the downstream pipe line is provided, there exists a problem that a water jump arises in an air vent pipe by formation of the air mass in a pipe line.

  On the other hand, the air rejection apparatus described in Patent Document 1 requires a connecting pipe and an air accumulation tank in addition to the inflow water tank, and therefore, the entire apparatus becomes large as in the structure shown in FIG. Moreover, also in the water diversion apparatus of patent document 2, since the several tank is provided in one pipe line system, drastic reduction in size cannot be achieved.

  The present invention has been made in view of such circumstances, and provides a water tank that can efficiently eliminate the entry of air into the downstream pipe and that can reduce the overall scale of the tank. With the goal.

  The water tank of the present invention includes a tank body, an inflow pipe and an outflow pipe provided in the tank body, and a vertical pipe with a spiral guide path disposed inside the tank body, and the vertical pipe with the spiral guide path. However, an inflow opening is provided at the upper end and an outlet is provided at the lower end, a center tube extending in the vertical direction along the center axis of the tube body, and an outer peripheral surface of the center tube. It has a spiral guide plate formed in a spiral shape, one end of the outflow pipe is connected to the outlet of the pipe body, and the other end of the outflow pipe is led to the outside of the tank body. It is said.

  In the water tank of the present invention, first, the inflow water flowing into the tank body from the inflow pipe is stored in the tank body, and the water level of the stored water rises with the inflow of the inflow water into the tank body. Next, when the water level of the stored water reaches the inflow opening at the upper end of the pipe body of the vertical pipe with a spiral guideway (when the water level is higher than the lower end of the opening), the opening at the upper end The stored water flows into the vertical pipe with a spiral guideway. And the inflow water which flowed into the vertical pipe with the spiral guide path flows downward while turning along the spiral guide plate, and flows out from the outlet at the lower part of the pipe body to the outside of the tank through the outflow pipe.

  As described above, in the water tank of the present invention, the inflowing water that has flowed into the tank body is caused to flow while spirally swirling with a vertical tube with a spiral guide path, so that it is possible to suppress air from being mixed into the flowing water flow. Can do. Moreover, even if air is mixed into the downstream water flow, the mixed air can escape through the central cylinder to the upper side of the water tank. Therefore, it is possible to efficiently eliminate the entry of air into the downstream pipe with a small-scale water tank without taking measures such as forming an air trap by increasing the tank length or providing a separate air accumulation tank. Can do.

  In the water tank of the present invention, it has a valve body that is displaceable in the vertical direction with respect to the upper end portion of the pipe body of the vertical pipe with a spiral guide path, and a float that can be floated on the water surface in the tank body. The valve body moves in conjunction with the vertical movement of the float accompanying the fluctuation of the water surface in the tank body, and the inflowing water flowing into the pipe body from the opening at the upper end of the pipe body of the vertical pipe with a spiral guideway You may provide the fixed_quantity | quantitative_function part of the structure which adjusts quantity.

  According to the present invention, since the mixed air into the downstream pipe can be efficiently removed, stable water supply can be realized. In addition, measures that have been taken in conventional open-type water diversion work, such as forming an air trap by increasing the tank length, or providing a separate air accumulation tank, are not required. Since the air mixed in the pipe line can be eliminated in the water tank, the entire water tank can be made compact. In addition, the cost can be reduced by shortening the construction period of the aquarium.

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

  FIG. 1 is a longitudinal sectional view showing an example of the water tank of the present invention. FIG. 2 is a plan view of the water tank.

  The aquarium 1 in this example is, for example, an open-type water supply channel system for pipelines of agricultural water channels, and is used for distributing water to be installed at a required point according to a drop in the route, a section distance, and the like. A water tank used as a diversion work, which is a tank body (for example, made of concrete) 2 and three vertical pipes (for example, made of resin) with three spiral guides installed inside the tank body 2. And.

  The tank body 2 has a rectangular parallelepiped shape and is open at the top. On the side wall of the tank body 2, an inlet 2 a to which the inflow pipe 3 is connected and a through hole 2 b for penetrating the outflow pipe 4 are provided. The inflow port 2a is provided at a position below the upper end of the pipe body 51 of the vertical pipe 5 with a spiral guide path described later. Further, the through hole 2b is provided at a position below the inflow port 2a.

  The vertical pipe 5 with a spiral guide path has a pipe body 51 provided with an inflow opening 51 a at the upper end and an outlet 51 b at the lower end, and a central cylinder extending in the vertical direction along the central axis of the pipe body 51. (Air venting pipe) 52 and a spiral guide plate 53 formed in a spiral shape on the outer peripheral surface of the central tube 52. The outlet 51 b of the pipe main body 51 communicates with the outflow pipe 4 via the connection short pipe 54. The outflow pipe 4 protrudes to the outside of the tank body 2 through the through hole 2 b on the side wall of the tank body 2.

  The upper end of the central cylinder 52 is located above the upper end of the tube body 51. Further, the lower end of the central tube 52 is located at a substantially central portion in the height direction of the tube main body 51.

  In the water tank 1 having the above structure, first, the water that has flowed into the tank body 2 from the inflow pipe 3 is stored in the tank body 2, and the water level WL of the stored water rises as the water flows into the tank body 2. To do. Then, when the water level WL of the stored water exceeds the upper end of the pipe body 51 of the vertical pipe 5 with the spiral guide path, the water overflows the upper edge of the pipe body 51 and passes through the opening 51a from the entire periphery of the upper edge. It flows into the vertical pipe 5 with a spiral guideway. The inflow water flowing into the vertical pipe 5 with the spiral guide path flows downward while turning along the spiral guide plate 53, and flows from the outlet 51 b at the lower part of the pipe body 51 to the outside of the tank through the connection short pipe 54 and the outflow pipe 4. And leaked.

  Thus, in the water tank 1 of this example, since the water to be diverted is caused to flow down while being spirally swirled by the vertical pipe 5 with the spiral guide path, it is possible to suppress the mixing of air into the flowing water flow. it can. Moreover, even when a certain amount of air is entrained when the water flows into the vertical pipe 5 with the spiral guideway, the air escapes through the center tube 52 to above the water surface WL of the stored water in the tank body 2. Can do. Therefore, the measures taken in the conventional open-type water diversion work, for example, the scale is small without taking measures such as forming the air trap by increasing the tank length or providing an air collecting tank separately. In the water tank, air mixing into the downstream pipe line can be efficiently eliminated.

  Here, in addition to the structure of the above example, as shown in FIG. 3, an air vent pipe 6 that communicates the inside of the outflow pipe 4 and the upper part of the tank body 2 may be provided.

  Moreover, in addition to the structure of the above example, a weir for adjusting the flow rate may be provided between the inlet 2a of the tank body 2 and the vertical pipe 5 with the spiral guide path.

  In the above example, the three longitudinal pipes 5 with the spiral guideway are arranged in the tank body 2, but the present invention is not limited to this, and the number of the longitudinal pipes 5 with the spiral guideway is arbitrary. Therefore, the number may be set according to the number of locations where water is diverted. Moreover, you may arrange | position the vertical pipe 5 with a spiral guideway in the tank main body 2. As shown in FIG.

-Other embodiments-
4 and 5 are diagrams schematically showing the main structure of another example of the water tank of the present invention.

  In this example, the water tank 1 having the structure shown in FIG. 1 is characterized in that a quantitative water diversion function unit 100 is provided above the vertical pipe 5 with a spiral guide path.

  The quantitative water distribution function unit 100 includes a valve body 101, a holding plate 102, a pair of link mechanisms 103 and 103, and a float 104 that can float on the water surface in the tank body 2.

  The valve body 101 is a cylindrical body (cap shape) having an opening at the bottom, and is disposed on the upper part of the vertical tube 5 with a spiral guide path. The valve body 101 has an outer diameter that is machined to be slightly smaller than the inner diameter of the pipe body 51, and is slidable in the vertical direction along the inner wall surface of the pipe body 51 of the vertical pipe 5 with the spiral guide path. It has become. The valve body 101 is held by a pair of link mechanisms 103 and 103.

  The holding plate 102 is a circular plate, and is fixed to the upper end of the pipe body 51 of the vertical pipe 5 with the spiral guide path. The upper end opening of the pipe body 51 is closed by the holding plate 102.

  On the side wall of the valve body 101, a plurality of circular openings 101a... 101a are provided at a predetermined pitch in the circumferential direction. Corresponding to the circular openings 101a,... 101a of these valve bodies 101, circular openings 51c,... 51c are provided at the upper end portion of the pipe body 51 of the vertical pipe 5 with the spiral guide path, as shown in FIG. In the state shown in FIG. 5A (fully open state), the circular openings 101a,... 101a of the valve body 101 and the circular openings 51c,.

  Each link mechanism 103 includes a vertical movement rod 131, a connecting rod 132, a support rod 133, a float rod 134, and the like, and a valve body 101 is attached to the lower end of the vertical movement rod 131. The float 104 is attached to the lower end of the float rod 134. Note that the vertical movement rod 131 passes through the holding plate 102. Further, although two vertical movement rods 131 are provided in each link mechanism 103, two connection rods 132, support rods 133 and float rods 134, which are other constituent members, are also provided. It may be left or one by one.

  The upper end of the vertically moving rod 131 is connected to the float rod 134 via the connecting rod 132. The connecting rod 132 is supported by a support rod 133, and the lower end of the support rod 133 is fixed to the holding plate 102 so that the support rod 133 is along the vertical direction.

  In the quantitative water distribution function unit 100 having the above structure, first, the water level WL is lowered from the state of FIG. 4 (A) and FIG. 5 (A) (fully opened state) and floats on the water surface in the tank body 2. When the float 104 descends, the valve body 101 rises as the float 104 descends, and the circular openings 101a, 101a of the valve body 101 and the circular openings 51c, 51c of the pipe body 51 of the longitudinal pipe 5 with the spiral guide path. Misalignment (vertical misalignment) occurs, and the amount of water that flows into the vertical pipe 5 with the spiral guide path decreases. When the water level WL further decreases and the float 104 descends and the valve body 101 further rises, the circular opening 101a... 101a of the valve body 101 and the circular shape of the pipe main body 51 of the longitudinal pipe 5 with the spiral guide path in the rising process. The positions of the openings 51c, 51c are completely displaced, and the circular openings 51c, 51c of the pipe body 51 are completely closed by the side wall of the valve body 101 (water supply is stopped). The rising end of the valve body 101 is regulated by the holding plate 102.

  On the other hand, when the water level WL rises and the float 104 rises and the valve body 101 descends from the state (closed state) of FIGS. 4B and 5B, the valve body 101 becomes circular in the descending process. A portion of the circular openings 51c, 51c of the pipe body 51 of the longitudinal pipe 5 with the spiral guide path coincides with the openings 101a, 101a, so that the water flows into the vertical pipe 5 with the spiral guide path. Further, the inflow amount of water into the vertical pipe 5 with the spiral guide path changes according to the degree of coincidence between the circular openings 101a,... 101a of the valve bodies 101 and the circular openings 51c,.

  As described above, according to the quantitative water diversion function unit 100 of this example, the valve body 101 is lowered and raised in conjunction with the rise and fall of the float 104 accompanying the water surface fluctuation in the tank body 2. Since the inflow amount (water supply amount) of the water to the vertical pipe 5 with the spiral guide path is adjusted by the vertical movement, the water level WL in the tank body 2 can be kept substantially constant.

  Examples of the present invention will be described below together with comparative examples.

<Example 1>
A model having the same structure as that of the water tank 1 of FIGS. 1 and 2 was produced, and the dimensions of the respective parts of the water tank model M1 were set to values shown in FIG. Further, the inner diameters of the inflow pipe 3 and the outflow pipe 4 were both φ25 mm, the height of the vertical pipe 5 with the spiral guide path was 300 mm, the inner diameter of the pipe body 51 was φ50 mm, and the inner diameter of the central tube 52 was φ16.5 mm. However, the number of the longitudinal pipes 5 with the spiral guideway is one.

  Using such a water tank model M1, as shown in FIG. 6, a water supply pipe 7 for supplying tap water was connected to the inflow pipe 3, and a downstream pipe 8 was connected to the outflow pipe 4. An air vent pipe 16 was connected to the outflow pipe 4. The air vent pipe 16 was a pipe (inner diameter: φ5 mm) extending linearly upward from the outflow pipe 4 and installed with the upper end open. In addition, the water tank model M1 and each pipe | tube were made into the transparent body so that the water flow which flows into the tank and a pipe | tube was observed.

  Then, the water tank model M1 is installed at a predetermined height position (for example, height = 300 mm), tap water is supplied to the inflow pipe 3 at a flow rate = 0.5 L / s, and the tap water is stored in the tank body 2. The water level was kept higher than the upper end of the pipe body 51 of the vertical pipe 5 with the spiral guide path, and water was caused to flow into and flow down into the vertical pipe 5 with the spiral guide path due to overflow. In this state, the internal conditions of the outflow pipe 4, the downstream pipe 8, and the air vent pipe 16 were visually confirmed. As a result, no air pool was generated in the outflow pipe 4 and the downstream pipe 8. Also, no water was ejected into the air vent pipe 16. Moreover, when the flow situation was observed, the flow quantity to the downstream pipe 8 was stable, and the fluctuation of the water level WL in the tank body 2 was not seen.

<Example 2>
As in Example 1, except that the flow rate was set to 1.0 L / s in Example 1, the internal conditions of the outflow pipe 4, the downstream pipe 8, and the air vent pipe 16 were visually confirmed. In addition, no air pool was generated inside the downstream pipe 8, and no water was jetted into the air vent pipe 16. Moreover, when the flow situation was observed, the flow quantity to the downstream pipe 8 was stable, and the fluctuation of the water level WL in the tank body 2 was not seen.

<Comparative Example 1>
As shown in FIG. 7, a model of a water tank (overflow method) in which a weir 205 was provided in the tank body 202 was produced, and the dimensions of each part of the water tank model M20 were set to the values shown in FIG. Further, the inner diameters of the inflow pipe 203 and the outflow pipe 204 were both set to 25 mm.

  Using such a water tank model M20, as shown in FIG. 7, the water supply pipe 7 for supplying tap water was connected to the inflow pipe 203, and the downstream pipe 8 was connected to the outflow pipe 204. An air vent pipe 206 was connected to the outflow pipe 204. The air vent pipe 206 was a pipe (inner diameter: φ5 mm) extending linearly upward from the outflow pipe 204 and installed with its upper end open. In addition, the water tank model M20 and each pipe | tube were made into the transparent body, and it was made possible to observe the water flow which flows into the tank and a pipe | tube.

  Then, the water tank model M20 is installed at a predetermined height position (for example, height = 300 mm), tap water is supplied to the inflow pipe 203 at a flow rate = 0.5 L / s, and the tap water is stored in the tank body 202. The water level of the stored water was kept higher than the upper end of the weir 205, and the water was overflowed and dropped to feed (downflow) the downstream pipe 8. In this state, the internal conditions of the outflow pipe 204, the downstream pipe 8 and the air vent pipe 206 were visually confirmed. As a result, water was ejected into the air vent pipe 206 at the start of flow, and the tank body 202 There was an air pocket near the exit. Furthermore, when the flow situation was observed, the water level WL in the tank main body 202 was fluctuating due to the occurrence of air pockets.

<Comparative Example 2>
As in Comparative Example 1, except that the flow rate was set to 1.0 L / s, the situation inside each of the outflow pipe 204, the downstream pipe 8, and the air vent pipe 206 was visually confirmed. There was a jet of water to the air vent pipe 206, and an air pool was generated near the outlet of the tank body 202. Furthermore, when the flow situation was observed, the water level WL in the tank main body 202 was fluctuating due to the occurrence of air pockets.

  The results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1 below.

It is a longitudinal cross-sectional view which shows an example of the water tank of this invention. It is a top view of the water tank of FIG. It is a longitudinal cross-sectional view which shows the modification of the water tank of FIG. It is a figure which shows typically the principal part structure of the other example of the water tank of this invention. It is a figure which shows typically the principal part structure of the other example of the water tank of this invention. It is a block diagram of the aquarium model used in the Example of this invention. It is a block diagram of the water tank model used by the comparative example of this invention. It is a figure which shows typically an example of the conventional open type water divider.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water tank 2 Tank main body 2a Inlet 2b Through-hole 3 Inflow pipe 4 Outflow pipe 5 Longitudinal pipe with spiral guide 51 Pipe main body 51a Opening at upper end of pipe main body 51b Outlet 51c Circular opening 52 Center tube 53 Spiral guide plate 54 Connection short pipe 6 Air vent pipe 100 Fixed water diversion function part 101 Valve body 101a Circular opening 102 Holding plate 103 Link mechanism 104 Float

Claims (2)

A tank body, an inflow pipe and an outflow pipe provided in the tank body, and a vertical pipe with a spiral guide path disposed inside the tank body,
The vertical pipe with the spiral guide path is provided with an inflow opening at the upper end and an outlet at the lower end, and a central tube extending in the vertical direction along the central axis of the pipe main body, A spiral guide plate formed in a spiral shape on the outer peripheral surface of the center tube, one end of the outflow pipe is connected to the outlet of the pipe body, and the other end of the outflow pipe is connected to the outside of the tank body. An aquarium characterized by being guided.   The tank body includes a valve body provided to be vertically displaceable with respect to an upper end portion of a pipe body of the vertical pipe with the spiral guide path, and a float provided to be floatable on a water surface in the tank body. The valve body moves in conjunction with the vertical movement of the float accompanying the fluctuation of the water level in the inside, and the amount of inflow water flowing into the pipe body from the opening at the upper end of the pipe body is adjusted. The aquarium according to claim 1, wherein

Images