JP2008101397A - Water tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water tank in which the entry of air into a downstream side pipe is efficiently prevented from occurring, and the general size of which is made compact. <P>SOLUTION: The water tank 1 comprises a tank body 2, an inflow pipe 3 and an outflow pipe 4 fitted into the tank body 2, and a vertical pipe 4 with a spiral guide passage disposed inside the tank body 2. The vertical tank 5 with a spiral guide passage comprises a pipe body 51 having an outflow port 511 formed at the lower end part, a center tube 52 vertically extending along the center axis of the pipe body 51, and a spiral guide plate 53 spirally formed on the outer peripheral surface of the center tube 52. One end of the outflow pipe 4 is connected to the outflow port 511 of the pipe body 51. A vertically displaceable extension pipe part 7 is connected to the upper end of the pipe body 51. A water quantity flowing into the pipe body 51 is adjusted by vertically displacing the extension pipe part 7 according to a variation in the level of the water in the tank body 2. <P>COPYRIGHT: (C)2008,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. 4, 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 water diversion, as shown in FIG. 4, the distance (tank length) L from the weir 302 to the outlet 301b is set to L = 4D-5D as a method for preventing air from entering the downstream pipe. 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. 4, 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.

  In order to achieve the above-described object, a water tank according to 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. The vertical pipe with a spiral guide path is formed in a spiral shape on a pipe body provided with an outlet at the lower end, a central cylinder extending in the vertical direction along the central axis of the pipe body, and an outer peripheral surface of the central cylinder. A spiral guide plate, and 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. A telescopic tube part that can be displaced in the vertical direction with respect to the upper end of the tube body is provided. Controls the inflow of water into the vertical pipe with a spiral guideway by displacing the telescopic pipe part in the vertical direction. Characterized in that it is configured to capacity.

  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 upper end of the telescopic pipe part of the vertical pipe with the spiral guide path (when the water level is higher than the upper end of the telescopic pipe part), The stored water flows into the pipe. The inflowing water that has flowed into the vertical pipe with the spiral guide passage flows downward while swirling along the spiral guide plate, and flows out from the outlet at the bottom of the pipe body to the outside of the tank through the outflow pipe. Yes.

  And it is possible to control the inflow of the stored water by expanding and contracting the upper and lower telescopic pipe portions of the vertical pipe with the spiral guide path, and appropriately depending on the amount of stored water, the spiral guide path It is possible to select whether or not to flow into the vertical pipe.

  Moreover, since the inflow water which flowed into the tank main body is made to flow down spirally by the vertical pipe with a spiral guide path, it can suppress that air mixes into the flowing-down water flow. 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 configured as described above, the present invention may be configured such that at least a part of the telescopic tube portion is formed in a bellows shape and can be expanded and contracted in the tube axis direction.

  Alternatively, the telescopic tube portion and the tube main body are formed so as to be fitted to each other, and an annular seal member is provided on one of the upper end portion of the tube main body and the lower end portion of the telescopic tube portion, and a retaining mechanism is provided on the other. It may be a configured.

  With such a configuration, it is possible to easily adjust the vertical displacement of the telescopic tube portion, and it is possible to realize stable water supply without requiring a large-scale device.

  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, the best mode for carrying out the water tank according to the present invention will be described with reference to the drawings.

  1 and 2 are explanatory views schematically showing an example of a water tank according to the present invention together with a longitudinal section, and FIG. 3 is a cross-sectional 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. It is a water tank used as a diversion work, Comprising: A tank main body (for example, made of concrete) 2 and three vertical pipes (for example, made of resin) 5 ... 5 with three spiral guides installed inside the tank main body 2 It has.

  The tank body 2 has a rectangular parallelepiped shape and has an opening at the top. The upper opening of the tank body 2 is normally closed by a lid member 21 made of grating or the like. 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 to be 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 main body 51 having an upper end opened and an outlet 511 provided at the lower end, and a central cylinder (air vent pipe) 52 extending in the vertical direction along the central axis of the pipe main body 51. And a spiral guide plate 53 formed in a spiral shape on the outer peripheral surface of the center tube 52. The outlet 511 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.

  Moreover, in this embodiment, the expansion / contraction pipe | tube part 7 is provided in the upper part of the vertical pipe 5 with a spiral guide path in the water tank 1 of the said structure. The telescopic tube portion 7 can be displaced in the vertical direction with respect to the upper end portion of the tube main body 51. The expandable tube portion 7 is a substantially cylindrical tube body that is formed in a bellows shape and can be expanded and contracted in the tube axis direction, and an opening 71 for inflow of water is formed at the upper end. The telescopic tube portion 7 may be at least partially formed in a bellows shape and can be expanded and contracted, and the entire telescopic tube portion 7 may be in a bellows shape as illustrated.

  An upper plate 72 is attached to the opening 71 of the telescopic tube portion 7 in a bowl shape. Further, the telescopic tube portion 7 and the tube main body 51 are connected by fixing and fastening a fixing band 73 on the outer periphery.

  Furthermore, a power unit 8 for displacing the telescopic tube unit 7 in the vertical direction is provided at the upper part of the vertical tube 5 with a spiral guide path. The power unit 8 includes a hoisting machine 81 having appropriate power such as a hydraulic jack, a pulley, and a traction lever such as a chain lever hoist. The hoisting machine 81 is provided on the lid member 21 of the tank body 2 and is connected to the telescopic pipe part 7. In the illustrated form, the chain 82 suspended from the hoisting machine 81 is fastened to the upper plate 72 to connect the telescopic tube portion 7.

  When the upper plate 72 connected to the chain 82 is pulled up by the action of the power unit 8, the telescopic tube unit 7 can be extended in the tube axis direction and the upper end opening 71 can be displaced upward in the tube axis direction. It has become. On the contrary, by pulling down the chain 82, the telescopic tube portion 7 can be contracted and the opening 71 at the upper end can be displaced downward.

  In the water tank 1, first, 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 with the inflow of water into the tank body 2. Then, when the water level WL of the stored water exceeds the opening 71 at the upper end of the expansion / contraction pipe part 7 of the vertical pipe 5 with the spiral guide path, the water overflows the upper end periphery of the expansion / contraction pipe part 7, It flows into the vertical pipe 5 with the spiral guide path through the opening 71 from the periphery. Therefore, the amount of water flowing into the tube main body 51 is adjusted by displacing the telescopic tube portion 7 in the vertical direction in accordance with the fluctuation of the water level in the tank main body 2.

  FIG. 1 shows a state in which the telescopic tube portion 7 is contracted, and since the water level WL of the stored water is higher than the upper end of the telescopic tube portion 7, water can flow in from the opening 71, and a spiral guide path is provided. Water is introduced into the vertical pipe 5.

  The water that has flowed 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 511 at the bottom of the pipe body 51 to the outside of the water tank 1 through the connection short pipe 54 and the outflow pipe 4. Spill into.

  FIG. 2 shows a state in which the expansion tube portion 7 is extended upward by the power unit 8 and the height of the opening 71 at the upper end of the expansion tube portion 7 is equal to the height of the water surface WL. In this case, since water does not overflow the upper peripheral edge of the telescopic tube portion 7, water does not flow into the vertical tube 5 with the spiral guide path from the opening 71.

  Thus, the water supply to the downstream side of the water tank 1 can be stopped by adjusting the height of the opening 71 of the telescopic tube portion 7 to be equal to or higher than the maximum water level of the water surface WL. That is, by appropriately displacing the telescopic tube portion 7 in the vertical direction according to the amount of water flowing into the aquarium 1, it is possible to enable water supply to the downstream side of the aquarium 1 or to easily control it by stopping it. it can.

  Moreover, in the aquarium 1 of the present invention, for example, the water to be diverted is caused to flow down while being spirally swirled by the vertical pipe 5 with the spiral guide path, so that it is possible to prevent air from entering the flowing water flow. . Moreover, even when a certain amount of air is entrained when water flows into the vertical pipe 5 with the spiral guide path, the air escapes through the central cylinder 52 to above the water level 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.

  In addition, in the water tank 1 of this invention, you may provide the air vent pipe which connects the pipe | tube inside of the outflow pipe 4 and the upper part in the tank main body 2 in addition to said structure. The structure of the telescopic tube portion 7 is not limited to the above example, and any configuration may be employed as long as the opening 71 at the upper end of the telescopic tube portion 7 can be displaced vertically in the tube axis direction. .

  That is, for example, the expansion tube portion 7 and the tube main body 51 may be formed so as to be fitted to each other so that the expansion tube portion 7 can be displaced in the vertical direction with respect to the tube main body 51. In this case, an annular seal member such as a rubber ring is provided on one of the upper end portion of the tube main body 51 and the lower end portion of the telescopic tube portion 7, and a retaining mechanism is provided on the other. preferable.

  In this case, the tube body 51 is provided with an annular seal member on the inner peripheral surface of the upper end to serve as a receiving port, whereas the cylindrical tubular expandable tube portion 7 has a retaining mechanism for the tube body 51 on the outer peripheral surface of the lower end portion thereof. It is possible to have a structure in which the expansion tube portion 7 can be pulled up to an appropriate height by the power portion 8 or pulled down. Even in such a configuration, it is possible to control the inflow of water by setting the height of the opening 71 of the telescopic tube portion 7 to be lower than the water surface WL or adjusting it to the same level or higher. Become.

  Moreover, in the above example, the three vertical pipes 5 with a spiral guide way are arrange | positioned in the tank main body 2, However, this invention is not restricted to this, The number of the vertical pipes 5 with a spiral guide way 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 guide path in the tank main body 2. As shown in FIG.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for water tanks such as water separators (water tanks) such as agricultural water, water and sewage systems, and industrial water.

It is explanatory drawing which shows typically an example of the water tank of this invention with a longitudinal cross-section. It is explanatory drawing which shows typically the state which extended the expansion-contraction pipe part of the said water tank. It is a cross-sectional view of the water tank. 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 Inflow port 2b Through-hole 21 Lid member 3 Inflow pipe 4 Outflow pipe 5 Vertical pipe | tube with a spiral guide way 51 Pipe main body 511 Outlet 52 Center pipe 53 Spiral guide plate 54 Connection short pipe 6 Air vent pipe 7 Expansion pipe Part 71 Opening 72 Upper plate 73 Fixed band 8 Power part 81 Hoisting machine 82 Chain

Claims (3)

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 a spiral guide path is formed in a spiral shape on a pipe body provided with an outlet at the lower end, a central cylinder extending in the vertical direction along the central axis of the pipe body, and an outer peripheral surface of the central cylinder. And 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,
The upper end of the tube body is provided with a telescopic tube part that is displaceable in the vertical direction with respect to the upper end part of the tube body, and the tank body includes a power unit that displaces the telescopic tube part in the vertical direction.
A water tank configured to be able to control the inflow of water into a vertical pipe with a spiral guide path by displacing the expansion and contraction pipe part in the vertical direction in accordance with the fluctuation of the water level in the tank body.   The aquarium according to claim 1, wherein at least a part of the telescopic tube portion is formed in a bellows shape and can be expanded and contracted in a tube axis direction.   The telescopic tube portion and the tube main body are formed so as to be fitted to each other, and either the upper end portion of the tube main body or the lower end portion of the telescopic tube portion is provided with an annular seal member and the other is provided with a retaining mechanism. The aquarium according to claim 1, wherein:

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