JP2006257824A - Device for preventing eddy intake of gate with pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preventing eddy intake of a gate with a pump, in which an eddy is prevented from being generated on a water surface on an intake side of the pump by a float put on the water surface of the intake side of the pump upon its operation when a water level is low, and a downward cover to be provided on the intake side of the pump can be eliminated. <P>SOLUTION: In the gate with the pump, in which the pump 3 for forcibly discharging the water in an upstream side water passage 2a of a rising/falling type gate 1a to the downstream side water passage 2b is fitted to the gate 1a, the float 5 is put on the water surface on the intake side of the pump 1 to be freely movable up and down according to the movement of the water level. The eddy is prevented from being generated on the water surface on the intake side of the pump 3 by the float 5 upon the operation when the water level is low. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention relates to a pump-equipped gate with a pump that forcibly discharges water in the upstream water channel to the downstream water channel, and in particular, floats on the water surface on the suction side of the pump, The present invention relates to a vortex suction prevention device for a gate with a pump, which prevents vortices generated on the water surface on the suction side of the pump during operation at a low water level.

When performing forced drainage operation with a gate with a pump, if the distance between the inlet of the pump and the water surface becomes shorter during operation at a low water level, a vortex is generated on the water surface, leading to a decrease in drainage efficiency.
For this reason, in general, a downward bellmouth cover is attached to the suction side of the pump to prevent the generation of vortices and to prevent vortex suction.
JP 2004-36559 A

However, in the drainage operation, since the suction shaft core is directed downward with respect to the horizontal pump shaft by the downward bell mouth-shaped cover attached to the suction side of the pump, suction resistance becomes a resistance and drainage efficiency decreases. There was a serious problem.
As measures against this, only measures have been taken to devise the shape of the suction port of the pump. Also, these measures tend to be expensive and expensive to manufacture.

  The present invention has been devised in view of the above-described problems to solve the problems. The object of the present invention is to float a float on the water surface on the suction side of the pump. To provide a vortex suction preventing device for a gate with a pump, which can prevent a vortex generated on the water surface on the suction side of the pump during operation at a water level and can eliminate the need for a downward cover provided on the suction side of the pump. is there.

  In order to achieve the above object, the invention of claim 1 is directed to a pump-mounted gate in which a pump for forcibly discharging water in an upstream water channel of a gate to a downstream water channel is attached to an elevating gate. The float is floated on the water surface so as to be able to move up and down in conjunction with the fluctuation of the water level, and this float comprises means for preventing vortices generated on the water surface on the suction side of the pump during operation at a low water level.

  According to a second aspect of the present invention, there is provided a pump gate in which a pump for forcibly discharging water in the upstream water channel to the downstream water channel is attached to the elevating type gate, and the float is placed on the water surface on the suction side of the pump. The float floats up and down in conjunction with the fluctuation of the float, and is composed of a flat float that floats on the water surface and side floats that are provided downward on the left and right ends of the flat float, and both left and right sides of the water channel on both sides of the float A float guide groove is formed on the wall to guide the raising and lowering of the float, and the height position of the lower end surface of the left and right float guide grooves is set so that the lower end side of the left and right side floats is in contact with the lower end surface of the float guide groove. The flat float that constitutes the float is positioned so that it floats on the water surface at the lowest operating level of the pump, and the flat float floats on the water surface on the suction side of the pump when operating at a low water level. Those consisting of means for preventing the vortex generated.

  Further, the invention of claim 8 is a gate with a pump in which a pump for forcibly discharging water from the upstream water channel of the gate to the downstream water channel is attached to the elevating gate. The float floats up and down in conjunction with fluctuations in the water level, and float guide grooves are formed on the left and right side walls of the water channel on both sides of the float to guide the float to rise and lower. The position of the flat type float is the position where the lower end of the left and right ends of the flat type float is in contact with the lower end surface of the float guide groove, and the level of the flat type float is at the level where it floats on the water surface at the lowest operating level of the pump. The float comprises means for preventing vortices generated on the water surface on the suction side of the pump during operation at a low water level.

  As is clear from the above description, according to the vortex suction preventing device for a gate with a pump according to the first, second, and eighth aspects of the invention, a low water level is obtained by a float floating on the water surface on the suction side of the pump. In this operation, vortices generated on the water surface on the suction side of the pump can be prevented, and a downward cover provided on the suction side of the pump can be eliminated. Further, since the vortex generated on the water surface can be prevented, the bell mouth shaft core on the suction side of the pump can be made to coincide with the pump shaft core, and the drainage efficiency is lowered by making these shaft cores horizontal. Can be prevented.

  Further, according to the vortex suction preventing device for a pumped gate according to the invention of claim 2 and claim 8, by forming the float guide groove for guiding the raising and lowering of the float on the left and right side walls of the water channel on both sides of the float. The float can be moved up and down smoothly, and the float can be prevented from deviating from the vortex generating water area on the water surface on the suction side of the pump.

  Moreover, in the case of Claim 3 and Claim 9, when the opening / closing float opens upward, when the gate is pulled up for inspection or natural drainage, the flat float constituting a part of the float rises. It is possible to avoid obstructing the pump.

  Further, in the case of claim 4, the buoyancy of the float can be adjusted by the buoyancy adjusting unit provided on the side float.

  Moreover, in the case of Claim 5, the draft depth of the float in a minimum operating water level can be adjusted with the draft depth adjusting screw provided in the lower end side of the side part float.

  Further, in the case of claims 6 and 10, the flat float in which the flowing water is submerged by the water surface peeling prevention curved surface provided on the lower surface side of the upstream end of the flat float constituting a part of the float. It is possible to prevent the vortex from being generated on the lower surface side of the flat float by preventing peeling from the lower surface corner.

  Moreover, in the case of Claim 7 and Claim 11, the eddy current water from the clearance between the downstream end of the planar float and the gate is controlled by the water control plate provided at the downstream end of the planar float constituting a part of the float. Inhalation of can be prevented.

  Hereinafter, the present invention will be described more specifically based on the best mode for carrying out the invention described in the drawings.

[Best Mode-1]
Here, FIG. 1 is a side sectional view, and FIG. 2 is a front view.

  1 and 2, the pump-equipped gate 1 is attached to the gate 1a by a pump 3 for forcibly discharging the water in the upstream water channel 2a of the gate 1a to the pressure regulating water tank provided in the downstream water channel 2b or the downstream water channel 2b. It has the structure described above, and is installed so as to block the water channel 2 in the transverse direction with respect to the water channel 2. The gate with pump 1 has a structure that opens and closes the water channel 2 by raising and lowering a gate 1a as a door body.

  The gate 1 with a pump raises the gate 1a during natural drainage and drains water during forced drainage, and uses the pump 3 attached to the gate 1a with the gate 1a closed during forced drainage. Is forcibly drained into the downstream water channel 2b.

  The gate 1a is composed of a rectangular and plate-like skin plate, vertical and horizontal reinforcing girders attached to the surface of the skin plate facing the upstream water channel 2a. The skin plate of the gate 1a is reinforced by these reinforcing girders to increase the rigidity.

  On both left and right sides of the water channel 2 where the pumped gate 1 is installed, guide grooves (not shown) for vertically sliding and guiding the left and right ends of the gate 1a are formed respectively. The gate 1a is formed in the guide grooves. It is structured to rise and fall along. Rollers 1b around the horizontal axis parallel to the transverse direction of the water channel 2 that reduce sliding resistance with the guide groove are provided at the left and right ends of the gate 1a, respectively, so that the guide groove is provided when the gate 1a moves up and down. Can be moved up and down smoothly.

  At the upper end of the gate 1a, a connector 1c to which the lower end side of a wire rope (not shown) for raising and lowering the gate 1a is connected is attached. For example, two connecting tools 1c are attached to the left and right sides of the upper end. For example, the upper end side of a wire rope (not shown) whose lower end side is connected to the connector 1c is wound around a winding drum (not shown) provided above, and the winding drum is rotated forward and backward by a driving motor (not shown). The structure is such that the gate 1a connected to the lower end side of the wire rope is moved up and down by winding or lowering the wire rope.

  On the surface of the lower part of the gate 1a facing the upstream water channel 2a of the water channel 2, the pump 3 is mounted substantially horizontally with respect to the vertical gate 1a in a state of protruding toward the upstream water channel 2a. The pump 3 performs a function of forcibly draining the water in the upstream water channel 2a of the gate 1a toward the downstream water channel 2b in a state where the gate 1a is closed. In the drawing, for example, two pumps 3 are attached to the left and right sides of the lower part of the gate 1a. For example, an axial pump is used as the pump 3.

  For example, the pump 3 composed of an axial flow pump includes a water guide pipe 3a through which water passes, an unillustrated impeller hub attached to the center of the water guide pipe 3a, a non-illustrated conductive shaft that transmits the driving force of the motor to the impeller hub, and the like. ing.

  The water guide pipe 3a of the pump 3 is formed in a cylindrical shape, the tip side suction port 3b facing the upstream water channel 2a is formed in a trumpet shape, and the trumpet shape suction port 3b is opened horizontally toward the front. In addition, since the suction shaft core and the pump shaft are on the same horizontal line, the suction resistance is prevented and the drainage efficiency is prevented from decreasing. Further, the water conduit 3a of the pump 3 is attached to the gate 1a so that the suction port 3b is at a height near the bottom of the water channel when the gate is fully closed.

  The peripheral edge side of the rear end of the water conduit 3a is integrally attached to a hole (not shown) formed in the pump mounting plate 1d attached to the surface of the gate 1a by a bolt or the like. That is, the water conduit 3a of the pump 3 is attached to the surface of the gate 1a via the pump attachment plate 1d.

  An opening / closing door 4 is attached to the rear end side of the water conduit 3 a of the pump 3. For example, a flap gate is used for the open / close door 4. For example, the open / close door 4 formed of a flap gate is attached to the downstream side water channel 2b back to back on the back side of the pump mounting plate 1d on which the pump 3 is mounted. For example, the open / close door 4 formed of a flap gate faces the downstream water channel 2b through an opening formed in the skin plate of the gate 1a.

  The open / close door 4 is openably and closably attached to the front end side surface facing the downstream water channel 2b of the discharge pipe 4a attached to the back side of the pump mounting plate 1d. For example, the open / close door 4 formed of a flap gate is connected by a hinge structure 4b to the back surface side of the pump mounting plate 1d above the discharge pipe 4a whose upper end faces the downstream water channel 2b.

  For example, the open / close door 4 formed of a flap gate has a so-called check valve structure that opens toward the downstream water channel 2b of the gate 1a and closes toward the upstream water channel 2a of the gate 1a with the hinge structure 4b at the upper end as a rotation center. It has become. The open / close door 4 is closed when the water pressure in the downstream water channel 2b is high to prevent a back flow from the downstream water channel 2b, and is opened by the water pressure of the discharged water from the pump 3 during forced drainage by driving the pump 3 to open the gate 1a. The water in the upstream water channel 2a can be drained into the downstream water channel 2b.

  The discharge pipe 4a and the open / close door 4 in a closed state are accommodated in a space between the pump mounting plate 1d and the skin plate on the inner side of the gate 1a, that is, the thickness side of the gate 1a. The discharge pipe 4a attached to the inner side of the gate 1a and the closed open / close door 4 are accommodated within the thickness of the gate 1a that moves up and down, and the discharge pipe 4a and the open / close door 4 move when the gate 1a moves up and down. There is no hindrance to lifting.

  The float 5 functions to prevent vortices generated on the water surface on the suction side of the pump 3 during operation at a low water level, and the water level on the suction side of the pump 3, that is, on the water surface of the suction port 3b of the water conduit 3a. It floats up and down in conjunction with fluctuations. The float 5 is disposed on the water surface of the upstream water channel 2a of the gate 1a.

  The float 5 is composed of a floating body that floats on water, and is provided on the flat surface float 6 located on the water surface of the suction port 3b of the water conduit 3a of the pump 3 and on the left and right ends of the flat surface float 6 downward. It is composed of a vertical side float 7. The float 5 is formed in a U-shape downward from the front by a planar float 6 and left and right vertical side floats 7.

  Float guide grooves 2c are formed in the left and right side walls of the upstream water channel 2a where the float 5 is disposed. The float 5 moves up and down following the fluctuation of the water surface by buoyancy acting by being guided by the left and right float guide grooves 2c. Further, the lower end surface of the float guide groove 2 c is a position for supporting the float 5 floating on the water surface at the lowest operating water level of the pump 3.

  That is, the flat float 6 constituting the float 5 floats on the water surface at the lowest operating water level of the pump 3 at the position where the lower end sides of the left and right side floats 7 constituting the float 5 are in contact with the lower end surface of the float guide groove 2c. The positions of the lower end surfaces of the left and right float guide grooves 2c are set so as to be the height.

  The planar float 6 has a square shape when viewed from the plane. The left and right ends of the rectangular flat float 6 are guided in float guide grooves 2c formed on the left and right side walls of the upstream water channel 2a. The upstream end of the rectangular flat float 6 extends further to the upstream water channel 2a side than the suction port 3b of the water conduit 3a of the pump 3 below, and the vortex generated on the water surface on the suction side of the pump 3 It extends to a position that completely covers this part. The downstream end of the rectangular planar float 6 extends to the vicinity of the front of the gate 1a of the upstream water channel 2a, but the downstream end of the planar float 6 has a gap between the front of the gate 1a and moves up and down. It arrange | positions so that it may not contact 1a.

  The rectangular planar float 6 has a certain thickness and is not easily deformed by waves on the water surface. On the lower surface side of the upstream end of the flat float 6, the water surface is peeled off from the lower surface of the flat float 6 where the flowing water is submerged so as to protrude downward and have a smooth upward curved surface toward the downstream side. A prevention curved surface 6a is formed.

  The portion near the downstream side of the flat float 6 that is on the ascending / descending path of the water conduit 3a of the pump 3 does not interfere with the flat float 6 when natural drainage is performed or when the gate 1a is pulled up during inspection of the pump 3. In this way, the pump is opened upward and does not obstruct the passage of the water conduit 3a of the pump 3 that rises integrally with the gate 1a.

  That is, the open / close float 6 b is attached to the downstream side portion of the flat float 6. The opening / closing float 6b has an upstream end connected to the planar float 6 by, for example, a hinge structure, and is configured to open and open upward with the hinge structure as a rotation center. The open / close float 6 b constitutes a part of the planar float 6.

  When the gate 1a is pulled up, the water guide pipe 3a of the pump 3 that rises integrally with the gate 1a is opened by pushing up the opening / closing float 6b, and the opening / closing float 6b opens upward with the hinge structure as the center of rotation. To avoid getting in the way. When the gate 1a is fully closed, the open / close float 6b opened manually is closed.

  The open / close float 6b is attached in a U-shape to the downstream side portion that is a part of the planar float 6 when viewed from the plane. That is, the flat-type float 6 has a recessed portion formed by notching a portion closer to the downstream side in a U-shape, and the open / close float 6b is attached to the recessed portion. The inner peripheral edge of the recess of the flat type float 6 has a stepped shape that partially protrudes toward the inner peripheral side, and the outer peripheral edge of the open / close float 6b that contacts the inner peripheral edge of the stepped recess is also vertically It is formed in a stepped shape that engages. And the vortex entrainment prevention rubber 6c is attached to the surface of the level | step-difference part of the inner peripheral edge of the recess of this planar float 6. FIG.

  Depending on the design conditions, that is, the relationship between the flow velocity, the minimum operating water level and the position of the pump 3, a water control plate 6d is installed at the downstream end of the flat float 6 as necessary to prevent inhalation of vortex water from the gate 1a side. May be. The water control plate 6d is attached downward to the downstream end of the flat float 6 near the gate 1a. The water control plate 6d protrudes downward from the lower surface of the flat float 6 and is attached so as to protrude across the width direction of the downstream end.

  When the gate 1a is opened and the upstream water is naturally drained, the water control plate 6d can be turned upward toward the downstream water channel 2b so that the flowed material flows smoothly. The upper end is connected to the downstream end of the planar float 6 by a hinge structure.

  The left and right side floats 7 are provided vertically downward from both left and right ends of the planar float 5a, and are arranged in the float guide groove 2c so as to move up and down in the float guide groove 2c by buoyancy. Yes. The left and right side floats 7 can adjust the buoyancy and the draft depth of the float 5.

  For example, a buoyancy adjusting unit 7 a is provided inside the left and right side floats 7. The buoyancy adjustment unit 7a is formed with a cavity for a buoyancy adjustment tank, for example, and the buoyancy of the float 5 can be adjusted by injecting or discharging water into the buoyancy adjustment tank.

  Further, for example, a draft depth adjusting screw 7b is attached to the lower end side of the left and right side floats 7 so as to protrude downward and forward, and the protruding length of the draft depth adjusting screw 7b from the lower end of the side float 7 is adjusted. By doing so, the height at which the lower end side of the side float 7 abuts on the lower end surface of the float guide groove 2c is adjusted, and the draft depth of the float 5 at the lowest operating water level can be adjusted.

  A horizontal axis parallel to the inner surface of the float guide groove 2c that reduces sliding resistance with the float guide grooves 2c formed on the left and right side walls of the upstream water channel 2a is formed on the upper surfaces of the left and right ends of the flat float 6 Around rollers 6e are provided. In addition, rollers 7c around the horizontal axis parallel to the inner surface of the float guide groove 2c for reducing sliding resistance with the float guide groove 2c are also provided below the left and right side floats 7, respectively. Yes. The float 5 can be moved up and down smoothly along the float guide groove 2c by the buoyancy acting when the water level of the upstream water channel 2a fluctuates by the rollers 6e and 7c provided above and below.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the pump 3 is driven in order to forcibly drain the water in the upstream water channel 2a to the downstream water channel 2b with the gate 1a closed, the water in the upstream water channel 2a of the gate 1a becomes the horizontal water conduit 3a of the pump 3. Is sucked toward the suction port 3b. At this time, the flat float 6 of the float 5 is floated on the water surface above the suction port 3b of the water conduit 3a of the pump 3.

  When water is sucked from the suction port 3b of the horizontal water conduit 3a of the pump 3, especially when the water level of the upstream water channel 2a is the lowest operating water level or a low water level close to this, the upper water surface of the suction port 3b is caused by suction. Although a vortex is generated, the flat float 6 floats in the water surface area where the vortex due to the suction is likely to occur, and the flat float 6 obstructs the generation of the vortex due to the suction. Is prevented.

  In this way, during forced drainage at a low water level, it is possible to prevent the generation of vortices due to suction on the water surface above the suction port 3b of the water conduit 3a of the pump 3, so that the suction port 3b of the water conduit 3a of the pump 3 can be prevented. The shaft core of the suction port 3b can be horizontal parallel to the pump shaft, and the shaft core of the suction port 3b can be directed downward with respect to the pump shaft. Therefore, it is possible to prevent a reduction in drainage efficiency that occurs.

  By the way, when the water level of the upstream water channel 2a of the gate 1a fluctuates, the float 5 moves up and down at the height position of the water surface following the fluctuation of the water level by the acting buoyancy. The float 5 is lifted and lowered by being guided by float guide grooves 2 c formed on the left and right side walls of the water channel 2. The float 5 moves up and down following the fluctuation of the water surface smoothly by the roller 6e and the roller 7c provided on the flat float 6 and the left and right side floats 7.

  Further, when the water level of the upstream water channel 2a of the gate 1a is further lowered from the minimum operating water level of forced drainage, the float 5 that follows the fluctuation of the water level on the water surface is upstream of the lower ends of the side floats 7 on the left and right sides. By contacting the lower end surface of the float guide groove 2c formed at a position higher than the bottom surface of the side water channel 2a, the descent stops at a position above the water conduit 3a of the pump 3 without following the lowered water surface. The flat type float 6 of the float 5 is further separated from the lowered water surface and stops at a position above the water guide pipe 3 a, so that the flat type float 6 of the float 5 is prevented from hitting the water guide pipe 3 a of the pump 3.

  When the water level of the upstream water channel 2a that has been further lowered from the minimum operating water level rises and the water surface rises to the stop position of the flat float 6, buoyancy starts to act on the flat float 6, and the float floats by this buoyancy. 5 rises following the rising water surface.

  Thus, while the float 5 moves up and down following the fluctuating water surface, the lower ends of the left and right side floats 7 come into contact with the bottom surface of the float guide groove 2c when the water level is further lowered from the minimum operating water level. Therefore, the flat float 6 of the float 5 does not hit the water conduit 3 a of the pump 3.

  Further, when the gate 1a is pulled up to the fully opened state for inspection of the gate or natural drainage, the water guide pipe 3a of the pump 3 that rises integrally with the gate 1a is provided with an open / close float 6b of the flat float 6 on the upper side. Push up from below. The pushed open / close float 6b pivots upward about the hinge structure portion at one end, and the pump 3 passes through the open portion of the open / close float 6b of the flat float 6 and is lifted together with the gate 1a. .

  When the raised gate 1a is lowered to be fully closed, the pump 3 passes through the open portion of the open / close float 6b of the planar float 6 and is pulled down together with the gate 1a. Thereafter, the open / close float 6b that has been opened is closed by the hand of the work.

When the gate 1a is pulled up to the fully open state for inspection of the gate or natural drainage, the open / close door 4 is located between the pump mounting plate 1d and the skin plate and is on the inner side of the gate 1a. At this time, the door 4 does not interfere with this.

[Best Mode-2]
Here, FIG. 3 is a side sectional view, and FIG. 4 is a front view.

  3 and 4, the pump-equipped gate 11 is attached to the gate 11a with a pump 13 for forcibly discharging the water in the upstream water channel 12a of the gate 11a to the pressure regulating water tank provided in the downstream water channel 12b or the downstream water channel 12b. The water channel 12 is installed in such a way that the water channel 12 is blocked in the transverse direction with respect to the water channel 12. The gate with pump 11 has a structure that opens and closes the water channel 12 by raising and lowering a gate 11a as a door body.

  The gate 11 with a pump raises the gate 11a for natural drainage, and drains water for forced drainage, using the pump 13 attached to the gate 11a with the gate 11a closed, for forced drainage, the water in the upstream water channel 12a of the gate 11a. Is forcibly drained into the downstream water channel 12b.

  The gate 11a includes a rectangular and plate-shaped skin plate, vertical and horizontal reinforcing girders attached to the surface of the skin plate facing the upstream water channel 12a, and the like. The skin plate of the gate 11a is reinforced by these reinforcing girders to increase the rigidity.

  Guide grooves (not shown) are formed on the left and right side surfaces of the water channel 12 where the gate 11 with a pump is installed to vertically slide the left and right ends of the gate 11a. The gate 11a is formed in the guide grooves. It is structured to rise and fall along. Rollers 11b around the horizontal axis parallel to the transverse direction of the water channel 12 that reduce sliding resistance with the guide groove are provided at the left and right ends of the gate 11a, respectively, so that the guide groove is provided when the gate 11a moves up and down. Can be moved up and down smoothly.

  At the upper end of the gate 11a, a connecting tool 11c for connecting the lower end side of a wire rope (not shown) for raising and lowering the gate 11a is attached. For example, two connecting tools 11c are attached to the left and right sides of the upper end. For example, the upper end side of a wire rope (not shown) whose lower end side is connected to the coupler 11c is wound around a winding drum (not shown) provided above, and the winding drum is rotated forward and backward by a driving motor (not shown). The structure is such that the gate 11a connected to the lower end side of the wire rope is moved up and down by winding or lowering the wire rope.

  On the surface of the lower part of the gate 11a facing the upstream water channel 12a of the water channel 12, a pump 13 is mounted substantially horizontally with respect to the vertical gate 11a in a state of protruding toward the upstream water channel 12a. The pump 13 performs a function of forcibly draining water from the upstream water channel 12a of the gate 11a toward the downstream water channel 12b in a state where the gate 11a is closed. In the drawing, for example, two pumps 13 are attached to the left and right sides of the lower part of the gate 11a. For example, an axial pump is used as the pump 13.

  For example, the pump 13 composed of an axial flow pump is composed of a water guide pipe 13a through which water passes, an unillustrated impeller hub attached to the inner center of the water guide pipe 13a, a non-illustrated conductive shaft for transmitting the driving force of the motor to the impeller hub, and the like. ing.

  The water conduit 13a of the pump 13 is formed in a cylindrical shape, a suction port 13b on the tip side facing the upstream water channel 12a is formed in a trumpet shape, and the trumpet-shaped suction port 13b opens horizontally toward the front. In addition, since the suction shaft core and the pump shaft are on the same horizontal line, the suction resistance is prevented and the drainage efficiency is prevented from decreasing. Further, the water conduit 13a of the pump 13 is attached to the gate 11a so that the suction port 13b is at a height near the bottom of the water channel when the gate is fully closed.

  The peripheral edge side of the rear end of the water conduit 13a is integrally attached to a hole (not shown) formed in a pump mounting plate 11d attached to the surface of the gate 11a by a bolt or the like. That is, the water conduit 13a of the pump 13 is attached to the surface of the gate 11a via the pump attachment plate 11d.

  An open / close door 14 is attached to the rear end side of the water conduit 13 a of the pump 13. For example, a flap gate is used for the open / close door 14. For example, the open / close door 14 formed of a flap gate is attached to the back surface of the pump mounting plate 11d on which the pump 13 is mounted on the surface, back to back, toward the downstream water channel 12b. For example, the open / close door 14 formed of a flap gate faces the downstream water channel 12b through an opening formed in the skin plate of the gate 11a.

  The open / close door 14 is openably and closably attached to the front surface facing the downstream water channel 12b of the discharge pipe 14a attached to the back surface side of the pump attachment plate 11d. For example, the open / close door 14 formed of a flap gate is connected by a hinge structure 14b to the back surface side of the pump mounting plate 11d above the discharge pipe 14a whose upper end faces the downstream water channel 12b.

  For example, the open / close door 14 formed of a flap gate has a so-called check valve structure that opens toward the downstream water channel 12b of the gate 11a and closes toward the upstream water channel 12a of the gate 11a with the hinge structure 14b at the upper end as a rotation center. It has become. The open / close door 14 is closed when the water pressure in the downstream water channel 12b is high to prevent backflow from the downstream water channel 12b, and is opened by the water pressure of the discharge water discharged from the pump 13 during forced drainage by driving the pump 13 to open the gate 11a. The water in the upstream water channel 12a can be drained into the downstream water channel 12b.

  The discharge pipe 14a and the open / close door 14 in a closed state are accommodated in the space between the pump mounting plate 11d and the skin plate on the inner side of the gate 11a, that is, the thickness side of the gate 11a. The discharge pipe 14a attached to the inner side of the gate 11a and the open / close door 14 in a closed state are accommodated within the thickness of the gate 11a that moves up and down, and the discharge pipe 14a and the open / close door 14 are moved when the gate 11a moves up and down. There is no hindrance to lifting.

  The float 15 serves to prevent vortices generated on the water surface on the suction side of the pump 13 during operation at a low water level. The float 15 has a water level on the water surface of the suction side of the pump 13, that is, the suction port 13b of the water conduit 13a. It floats up and down in conjunction with fluctuations. The float 15 is disposed on the water surface of the upstream water channel 12a of the gate 11a.

  The float 15 is composed of a floating body that floats on water, and is composed of a planar structure located on the water surface of the inlet 13 b of the water conduit 13 a of the pump 13. The float 15 is formed in a horizontal plate shape as viewed from the front.

  Float guide grooves 12c are formed in the left and right side walls of the upstream water channel 12a where the float 15 is disposed. The float 15 moves up and down following the fluctuation of the water surface by buoyancy acting by being guided by the left and right float guide grooves 12c. The lower end surface of the float guide groove 12 c is formed at a height above the water conduit 13 a of the pump 13, and is a position for supporting the float 15 floating on the water surface at the lowest operating water level of the pump 13.

  That is, the left and right floats are positioned so that the flat float 15 has a height that floats on the water surface at the lowest operating level of the pump 13 at the positions where the lower ends of the left and right ends of the float 15 are in contact with the lower end surface of the float guide groove 12c. The position of the lower end of the guide groove 12c is set.

  The float 15 has a square shape when viewed from the plane. The left and right ends of the rectangular float 15 are guided in float guide grooves 12c formed on the left and right side walls of the upstream water channel 12a. The upstream end side of the rectangular float 15 extends further to the upstream water channel 12a side than the suction port 13b of the water conduit 13a of the pump 13 below, and a vortex portion generated on the water surface on the suction side of the pump 13 It extends to the position completely covering. The downstream end of the rectangular float 15 extends to the vicinity of the front surface of the gate 11a of the upstream water channel 12a, but the downstream end of the float 15 has a gap between the front surface of the gate 11a and does not contact the rising and lowering gate 11a. Are arranged as follows.

  The rectangular planar float 15 has a certain thickness and is difficult to be deformed by waves on the water surface. On the lower surface side of the upstream end portion of the flat type float 15, a downwardly protruding curved surface that protrudes downward and is smooth toward the downstream side is formed so as not to separate from the lower surface corner of the flat type float 15 where the flowing water is submerged. A water surface peeling prevention curved surface 15a is formed.

  A portion near the downstream side of the flat float 15 on the hoisting path of the water conduit 13a of the pump 13 is obstructed by the flat float 15 when natural drainage is performed or when the gate 11a is pulled up when the pump 13 is inspected. In order to prevent this, the pump 13 opens upward and does not obstruct the passage of the water conduit 13a of the pump 13 that rises integrally with the gate 11a.

  That is, the open / close float 15 b is attached to the downstream side portion of the flat float 15. The opening / closing float 15b has an upstream end connected to the planar float 15 by, for example, a hinge structure, and is configured to open and open upward with the hinge structure as a rotation center. The open / close float 15 b constitutes a part of the planar float 15.

  When pulling up the gate 11a, the water conduit 13a of the pump 13 that rises integrally with the gate 11a is opened by pushing up the open / close float 15b, and the open / close float 15b opens upward with the hinge structure as the center of rotation. To avoid getting in the way. When the gate 11a is fully closed, the open / close float 15b opened manually is closed.

  The open / close float 15b is attached to the downstream side portion of the flat float 15 in a U-shape when viewed from the plane. That is, the flat-type float 15 has a recessed portion formed by cutting out a portion closer to the downstream side in a U-shape, and the open / close float 15b is attached to the recessed portion. The inner peripheral edge of the recess of the flat type float 15 has a stepped shape partly protruding toward the inner peripheral side, and the outer peripheral edge of the open / close float 15b contacting the inner peripheral edge of the stepped recess is also vertically It is formed in a stepped shape that engages with. A vortex entrainment prevention rubber 15c is attached to the surface of the step portion on the inner peripheral edge of the recess of the flat type float 15.

  Depending on the design conditions, that is, the relationship between the flow velocity, the minimum operating water level and the position of the pump 13, a water control plate 15d is provided at the downstream end of the flat float 15 as necessary to prevent the intake of vortex water from the gate 11a side. May be installed. The water control plate 15d is attached to the downstream end of the planar float 15 near the gate 11a so as to face downward. The water control plate 15d protrudes downward from the lower surface of the flat float 15 and is attached so as to protrude across the width direction of the downstream end.

  When the gate 11a is opened and the upstream water is naturally drained, the water control plate 15d can be turned upward toward the downstream water channel 12b so that the flowed material flows smoothly. The upper end is connected to the downstream end of the planar float 15 by a hinge structure.

  Horizontal surfaces parallel to the inner surface of the float guide groove 12c that reduce sliding resistance with the float guide grooves 12c formed on the left and right side walls of the upstream water channel 12a are provided on the upper surfaces of the left and right ends of the flat float 15. A roller 15e around the axis is provided. The float 15 can be moved up and down smoothly along the float guide groove 12c by the buoyancy acting when the water level of the upstream water channel 12a fluctuates by the rollers 15e provided on the left and right ends.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the pump 13 is driven in order to forcibly drain the water in the upstream water channel 12a to the downstream water channel 12b with the gate 11a closed, the water in the upstream water channel 12a of the gate 11a becomes the horizontal water conduit 13a of the pump 13. Is sucked toward the suction port 13b. At this time, a flat float 15 floats on the water surface above the suction port 13b of the water conduit 13a of the pump 13.

  When water is sucked from the suction port 13b of the horizontal water conduit 13a of the pump 13, especially when the water level of the upstream water channel 12a is the lowest operating water level or a low water level close to this, the upper water surface of the suction port 13b is caused by suction. Although a vortex is generated, a flat float 15 floats in the water surface area where the vortex due to the suction is likely to be generated, and the flat float 15 obstructs the generation of the vortex due to the suction. Is prevented from occurring.

  In this way, during forced drainage at a low water level, it is possible to prevent the generation of vortices due to suction on the water surface above the suction port 13b of the water conduit 13a of the pump 13, and therefore the suction port 13b of the water conduit 13a of the pump 13 The shaft core of the suction port 13b does not need to face downward with respect to the pump shaft, the shaft core of the suction port 13b can be horizontal and parallel to the pump shaft, and the shaft core of the suction port 13b faces downward with respect to the pump shaft. Therefore, it is possible to prevent a reduction in drainage efficiency that occurs.

  By the way, when the water level of the upstream water channel 12a of the gate 11a fluctuates, the float 15 moves up and down at the height of the water surface following the fluctuation of the water level by the buoyancy that acts. The float 15 is raised and lowered by being guided by float guide grooves 12 c formed on the left and right side walls of the water channel 12. The float 15 is moved up and down following the fluctuation of the water surface smoothly by the rollers 15e provided on the left and right ends.

  Further, when the water level of the upstream water channel 12a of the gate 11a is further lowered from the minimum operating water level of forced drainage, the float 15 that follows the fluctuation of the water level on the water surface has the water guide pipes 13a of the pump 13 at the lower left and right sides. By contacting the lower end surface of the float guide groove 12c formed at a position higher than the height of the pump 13 without following the lowered water surface, the descent stops at a position above the water conduit 13a of the pump 13, and the flat type The float 15 is further separated from the lowered water surface and stops at a position above the water conduit 13 a, so that the flat float 15 is prevented from hitting the water conduit 13 a of the pump 13.

  When the water level of the upstream water channel 12a that has been further lowered from the minimum operating water level rises and the water surface rises to the stop position of the flat float 15, buoyancy starts to act on the flat float 15, and this buoyancy As a result, the float 15 rises following the rising water surface.

  Thus, while the float 15 moves up and down following the fluctuating water surface, when the water level is further lowered from the minimum operating water level, the lower end sides on both the left and right sides of the flat type float 15 are the float guide grooves 12c. The flat-type float 15 does not hit the water conduit 13a of the pump 13 because it stops by coming into contact with the lower end surface.

  When the gate 11a is pulled up to the fully opened state for inspection of the gate or natural drainage, the water guide pipe 13a of the pump 13 that rises integrally with the gate 11a is open / closed to open and close the flat float 15 on the upper side. 15b is pushed up from the lower side. The pushed open / close float 15b pivots upward about the hinge structure portion at one end, and the pump 13 passes through the open portion of the open / close float 15b of the flat float 15 and lifts it together with the gate 11a. It is done.

  When the raised gate 11a is lowered to be fully closed, the pump 13 passes through the open part of the open / close float 15b of the flat type float 15 and is pulled down together with the gate 11a. Thereafter, the open / close float 15b that has been opened is closed by the hand of the work.

Further, when the gate 11a is pulled up to the fully opened state for inspection of the gate or natural drainage, the open / close door 14 is located between the pump mounting plate 11d and the skin plate and is on the inner side of the gate 11a. At this time, the door 14 does not hinder this.

[Best Mode-3]
Here, FIG. 5 is a side sectional view and FIG. 6 is a front view.

  5 and 6, the pump-equipped gate 21 is attached to the gate 21a with a pump 23 for forcibly discharging the water in the upstream water channel 22a of the gate 21a to the pressure regulating water tank provided in the downstream water channel 22b and the downstream water channel 22b. The water channel 22 is installed in such a manner that the water channel 22 is blocked in the transverse direction with respect to the water channel 22. The gate with pump 21 has a structure that opens and closes the water channel 22 by raising and lowering a gate 21a as a door body.

  The gate 21 with a pump raises the gate 21a to drain water during natural drainage, and uses the pump 23 attached to the gate 21a with the gate 21a closed when forced drainage, to the water in the upstream water channel 22a of the gate 21a. Is forcibly drained into the downstream water channel 22b.

  The gate 21a is composed of a rectangular and plate-like skin plate, vertical and horizontal reinforcing girders attached to the surface of the skin plate facing the upstream water channel 22a. The skin plate of the gate 21a is reinforced by these reinforcing girders to increase the rigidity.

  On both left and right sides of the water channel 22 where the pumped gate 21 is installed, guide grooves (not shown) are formed in the vertical direction to guide the left and right sides of the gate 21a to slide up and down. The gate 21a is formed in the guide grooves. It is structured to rise and fall along. Rollers 21b around the horizontal axis parallel to the transverse direction of the water channel 22 that reduce sliding resistance with the guide groove are provided at the left and right ends of the gate 21a, respectively, and guide grooves when the gate 21a moves up and down. Can be moved up and down smoothly.

  At the upper end of the gate 21a, a connecting tool 21c for connecting the lower end side of a wire rope (not shown) for raising and lowering the gate 21a is attached. For example, two connecting tools 21c are attached to the left and right sides of the upper end. For example, the upper end side of a wire rope (not shown) whose lower end side is connected to the coupler 21c is wound around a winding drum (not shown) provided above, and the winding drum is rotated forward and backward by a driving motor (not shown). The structure is such that the gate 21a connected to the lower end side of the wire rope is moved up and down by winding or lowering the wire rope.

  The surface of the pump mounting portion below the gate 21a on the side facing the upstream water channel 22a of the water channel 22 is opened, and the tip of the pump 23 projects from the surface of the gate 21a to the upstream water channel 22a in this opened interior. It is installed in a state that does not. The pump 23 is attached substantially horizontally to the vertical gate 21a in a state of projecting toward the downstream water channel 22b. The pump 23 functions to forcibly drain the water in the upstream water channel 22a of the gate 21a toward the downstream water channel 22b in a state where the gate 21a is closed. In the drawing, for example, two pumps 23 are attached to the left and right sides of the lower part of the gate 21a. For example, an axial flow pump is used as the pump 23.

  For example, the pump 23 composed of an axial flow pump is composed of a water conduit 23a through which water passes, an unillustrated impeller hub attached to the inner center of the water conduit 23a, a non-illustrated conductive shaft that transmits the driving force of the motor to the impeller hub, and the like. ing.

  The water conduit 23a of the pump 23 is formed in a cylindrical shape, a tip-side suction port 23b facing the upstream water channel 22a is formed in a trumpet shape, and the trumpet-shaped suction port 23b opens horizontally toward the front. In addition, since the suction shaft core and the pump shaft are on the same horizontal line, the suction resistance is prevented and the drainage efficiency is prevented from decreasing. Further, the water conduit 23a of the pump 23 is attached to the gate 21a so that the suction port 23b is at a height near the bottom of the water channel when the gate is fully closed.

  The peripheral edge of the front side of the water conduit 23a is integrally attached to a hole (not shown) formed in a pump mounting plate 21d attached to the surface facing the downstream water passage 22b of the gate 21a by a bolt or the like. That is, the water conduit 23a of the pump 23 is attached to the surface facing the downstream water channel 22b of the gate 21a via the pump attachment plate 21d.

  An open / close door 24 is attached to the rear end side of the water conduit 23 a of the pump 23. For example, a flap gate is used for the open / close door 24. For example, the open / close door 24 formed of a flap gate is attached toward the downstream water channel 22b.

  The open / close door 24 is openably and closably attached to the front end side surface facing the downstream water passage 22b of the discharge pipe 24a attached to the rear end side of the water guide pipe 23a. For example, the open / close door 24 formed of a flap gate is connected by a hinge structure 24b to the upper part of a flange that joins the rear end of the water conduit 23a facing the downstream water passage 22b and the discharge pipe 24a.

  For example, the open / close door 24 formed of a flap gate has a so-called check valve structure that opens toward the downstream water channel 22b of the gate 21a and closes toward the upstream water channel 22a of the gate 21a with the hinge structure 24b at the upper end as a rotation center. It has become. The open / close door 24 is closed when the water pressure in the downstream water channel 22b is high to prevent backflow from the downstream water channel 22b, and is opened by the water pressure of the discharged water discharged from the pump 23 during forced drainage by driving the pump 23. The water in the upstream water channel 22a can be drained into the downstream water channel 22b.

  The float 25 functions to prevent vortices generated on the water surface on the suction side of the pump 23 during operation at a low water level. The float 25 has a gate 21a in front of the suction side of the pump 23, that is, the suction port 23b of the water conduit 23a. It floats on the water surface of the upstream water channel 22a so as to be movable up and down in conjunction with the fluctuation of the water level. The float 25 is disposed on the water surface of the upstream water channel 22a of the gate 21a.

  The float 25 is composed of a floating body floating in water, and is composed of a planar structure located on the water surface of the gate 21a in front of the inlet 23b of the water conduit 23a of the pump 23. The float 25 is formed in a horizontal plate shape as viewed from the front.

  Float guide grooves 22c are formed in the left and right side walls of the upstream water channel 22a where the float 25 is disposed. The float 25 moves up and down following fluctuations in the water surface by buoyancy that is guided by the left and right float guide grooves 22c. The lower end surface of the float guide groove 22 c is formed at a height above the water guide pipe 23 a of the pump 23, and is a position for supporting the float 25 floating on the water surface at the lowest operating water level of the pump 23.

  In other words, the left and right floats are arranged so that the flat float 25 is at a height that floats on the water surface at the lowest operating level of the pump 23 at the positions where the lower ends of the left and right ends of the float 25 are in contact with the lower end surface of the float guide groove 22c. The position of the lower end of the guide groove 22c is set.

  The float 25 has a square shape when viewed from the plane. The left and right ends of the rectangular float 25 are guided in float guide grooves 22c formed on the left and right side walls of the upstream water channel 22a. The upstream end side of the rectangular float 25 extends further to the upstream water passage 22a side than the suction port 23b of the water conduit 23a of the pump 23 below, and a vortex portion generated on the water surface on the suction side of the pump 23 It extends to the position completely covering. The downstream end of the rectangular float 25 is in contact with the surface of the gate 21a of the upstream water channel 22a.

  The rectangular planar float 25 has a certain thickness and is difficult to be deformed by waves on the water surface. On the lower surface side of the upstream end portion of the flat type float 25, a downwardly protruding curved surface that protrudes downward and is smooth toward the downstream side is formed so as not to separate from the lower surface corner of the flat type float 25 where the flowing water is submerged. A water surface peeling prevention curved surface 25a is formed.

  A watertight rubber 25b is provided at the downstream end of the planar float 25 in contact with the surface of the gate 1a in order to eliminate a gap with the surface of the gate 21a and prevent vortex generation and air mixing. A receiving seat 21e is provided in the width direction of the gate 21a on the surface of the gate 21a with which the watertight rubber 25b at the downstream end of the float 25 abuts at the lowest operating water level.

  Horizontal surfaces parallel to the inner surface of the float guide groove 22c that reduces sliding resistance with the float guide grooves 22c formed on the left and right side walls of the upstream water channel 22a are provided on the upper surfaces of the left and right ends of the flat float 25. A roller 25c around the axis is provided. The float 25 can be moved up and down smoothly along the float guide groove 22c by the buoyancy that acts when the water level of the upstream water channel 22a fluctuates by the rollers 25c provided on the left and right ends.

Next, the operation based on the configuration of the best mode for carrying out the invention will be described below.
When the pump 23 is driven in order to forcibly drain the water in the upstream water channel 22a to the downstream water channel 22b with the gate 21a closed, the water in the upstream water channel 22a of the gate 21a becomes the horizontal conduit 23a of the pump 23. Is sucked toward the suction port 23b. At this time, a flat float 25 floats on the water surface above the suction port 23b of the water conduit 23a of the pump 23.

  In the case where water is sucked from the suction port 23b of the horizontal water conduit 23a of the pump 23, particularly when the water level of the upstream water channel 22a is the lowest operating water level or a low water level close to this, the upper water surface of the suction port 23b is caused by suction. Although a vortex is generated, a flat float 25 floats in the water surface area where the vortex due to the suction is likely to be generated, and the flat float 25 obstructs the generation of the vortex by the suction. Is prevented from occurring.

  In this manner, during forced drainage at a low water level, it is possible to prevent the generation of vortices due to suction on the water surface above the suction port 23b of the water conduit 23a of the pump 23. Therefore, the suction port 23b of the water conduit 23a of the pump 23 is prevented. The shaft core of the suction port 23b does not need to face downward with respect to the pump shaft, the shaft core of the suction port 23b can be horizontal and parallel to the pump shaft, and the shaft core of the suction port 23b faces downward with respect to the pump shaft. Therefore, it is possible to prevent a reduction in drainage efficiency that occurs.

  By the way, when the water level of the upstream water channel 22a of the gate 21a fluctuates, the float 25 moves up and down at the height of the water surface following the fluctuation of the water level by the buoyancy that acts. The float 25 is lifted and lowered by being guided by float guide grooves 22 c formed on the left and right side walls of the water channel 22. The float 25 moves up and down following the fluctuation of the water surface smoothly by the rollers 25e provided on the left and right ends.

  Further, when the water level of the upstream water channel 22a of the gate 21a is further lowered from the minimum operating water level of forced drainage, the float 25 that follows the fluctuation of the water level on the water surface has the water guide pipes 23a of the pump 23 at the lower left and right sides. By contacting the lower end surface of the float guide groove 22c formed at a position higher than the height of the pump 23, the descent stops at a position above the water conduit 23a of the pump 23 without following the lowered water surface. The float 25 is further away from the lowered water surface and stops at an upper position in front of the suction port 3b of the water conduit 23a, so that the flat float 25 is prevented from descending to the front of the suction port 23b of the water conduit 23a of the pump 23. Is done.

  When the water level of the upstream water channel 22a that has further decreased from the minimum operating water level rises and the water surface rises to the stop position of the flat float 25, buoyancy starts to act on the flat float 25, and this buoyancy As a result, the float 25 rises following the rising water surface.

  Thus, while the float 25 moves up and down following the fluctuating water surface, when the water level is further lowered from the minimum operating water level, the lower end sides on both the left and right sides of the flat type float 25 are the float guide grooves 22c. The flat float 25 does not hit the water conduit 23 a of the pump 23 because it stops by coming into contact with the lower end surface.

  Further, when the gate 21a is pulled up to the fully open state for inspection of the gate or natural drainage, the water conduit 23a of the pump 23 that rises integrally with the gate 21a protrudes toward the downstream water channel 22b. In addition, the flat float 25 does not hinder the rise. Further, when the gate 21a that has been lifted is lowered to be fully closed, the flat float 25 does not hinder the lowering.

Note that the present invention is not limited to the best mode for carrying out the invention, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described best mode, the case where the flap gates are used as the open / close doors 4, 14, and 24 has been described. However, the present invention is not limited to this. For example, an electric gate valve, butterfly valve, miter gate can be used instead of the flap gate. (Kannon door) may be used.
Further, in the best mode-3, the float 25 has been described as a flat type. However, the float 25 is not limited to this, and as in the best mode-1, the side float floats downward on the left and right ends of the float 25. May be provided respectively. In this case, as in the best mode-1, the side float is provided with a buoyancy adjusting unit, a draft depth adjusting screw, and a roller. Further, the position of the lower end surface of the float guide groove 22c is the same position as in the best mode-1 lower than the present one.

BRIEF DESCRIPTION OF THE DRAWINGS It is a sectional side view which shows the best form-1 for implementing this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the best form-1 for implementing this invention. It is a sectional side view which shows the best form-2 for implementing this invention. It is a front view which shows the best form-2 for implementing this invention. It is a sectional side view which shows the best form-3 for implementing this invention. It is a front view which shows the best form-3 for implementing this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gate with pump 1a Gate 1b Roller 1c Connecting tool 1d Pump mounting plate 2 Water channel 2a Upstream water channel 2b Downstream water channel 2c Float guide groove 3 Pump 3a Water conduit 3b Suction port 4 Open / close door 4a Discharge tube 4b Hinge structure 5 Float 6 Plane Mold float 6a Water surface peeling prevention curved surface 6b Opening and closing float 6c Vortex entrainment prevention rubber 6d Water control plate 6e Roller 7 Side float 7a Buoyancy adjustment part 7b Draught depth adjustment screw 7c Roller 11 Gate with pump 11a Gate 11b Roller 11c Pump 11d Pump Mounting plate 12 Water channel 12a Upstream side water channel 12b Downstream side water channel 12c Float guide groove 13 Pump 13a Water conduit 13b Suction port 14 Open / close door 14a Discharge tube 14b Hinge structure 15 Float 15a Water surface peeling prevention curved surface 15b Open / close float 15c Entrainment prevention rubber 15d Water control plate 15e Roller 21 Pumped gate 21a Gate 21b Roller 21c Connection 21d Pump mounting plate 21e Receiving seat 22 Water channel 22a Upstream water channel 22b Downstream water channel 22c Float guide groove 23 Pump 23a Water guide tube 23b 24 Opening / closing door 24a Discharge pipe 24b Hinge structure 25 Float 25a Water surface peeling prevention curved surface 25b Watertight rubber 25c Roller

Claims (11)

The pump with a pump that forcibly discharges the water in the upstream waterway of the gate to the downstream waterway is attached to the elevating type gate so that the float can be raised and lowered in conjunction with the fluctuation of the water level on the water surface on the suction side of the pump A vortex suction prevention device for a gate with a pump, characterized in that the float prevents the vortex generated on the water surface on the suction side of the pump during operation at a low water level. The pump with a pump that forcibly discharges the water in the upstream waterway of the gate to the downstream waterway is attached to the elevating type gate so that the float can be raised and lowered in conjunction with the fluctuation of the water level on the water surface on the suction side of the pump The float is composed of a flat float that floats on the surface of the water and side floats that are provided downward at the left and right ends of the flat float, and guides the lift of the float to the left and right side walls of the water channel on both sides of the float. A flat type float that forms a float guide groove and forms the float at the height position of the lower end surface of the left and right float guide grooves, and the lower end side of the left and right side floats abuts the lower end surface of the float guide groove is a pump At the lowest operating water level, and a level that floats on the surface of the water, and a flat float prevents vortices that occur on the water surface on the suction side of the pump when operating at low water levels Vortex suction preventing device of the pump with the gate, wherein. The vortex suction prevention device for a pumped gate according to claim 2, wherein an opening / closing float that opens upward is provided on a part of the flat float that is on the path of the pump that moves up and down. The vortex suction preventing device for a pumped gate according to claim 2, wherein the side float is provided with a buoyancy adjusting portion for adjusting the buoyancy of the float. The vortex suction prevention device for a gate with a pump according to claim 2, wherein a draft depth adjusting screw capable of adjusting a draft depth of the float at a minimum operating water level is provided on a lower end side of the side float. 3. The vortex suction preventing device for a pumped gate according to claim 2, wherein a water surface separation preventing curved surface is formed on the lower surface side of the upstream end portion of the flat type float. The vortex suction preventing device for a pumped gate according to claim 2, wherein a water control plate for preventing suction of vortex water from the gate side is installed at a downstream end of the flat float. In a pumped gate with a pump that forcibly discharges water from the upstream waterway to the downstream waterway, a flat float is placed on the water surface on the suction side of the pump in conjunction with fluctuations in the water level. Float so that it can be lifted up and down, and float guide grooves are formed on the left and right side walls of the water channel on both sides of the float to guide the lift of the float. At the position where the lower end of both ends abuts the lower end surface of the float guide groove, the flat type float is positioned so that it floats on the water surface at the lowest operating water level of the pump, and the pump at the time of operation at low water level by the flat type float A vortex suction preventing device for a gate with a pump, characterized by preventing a vortex generated on the water surface on the suction side of the pump. The vortex suction preventing device for a pumped gate according to claim 8, wherein an opening / closing float that opens upward is provided in a part of a flat type float on a path of a pump that moves up and down. The vortex suction preventing device for a pumped gate according to claim 8, wherein a water surface separation preventing curved surface is formed on the lower surface side of the upstream end portion of the flat type float. The vortex suction preventing device for a pumped gate according to claim 8, wherein a water control plate for preventing the suction of vortex water from the gate side is installed at a downstream end of the flat type float.

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