WO2019239750A1 - Pompe à arbre vertical - Google Patents

Pompe à arbre vertical Download PDF

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Publication number
WO2019239750A1
WO2019239750A1 PCT/JP2019/018488 JP2019018488W WO2019239750A1 WO 2019239750 A1 WO2019239750 A1 WO 2019239750A1 JP 2019018488 W JP2019018488 W JP 2019018488W WO 2019239750 A1 WO2019239750 A1 WO 2019239750A1
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Prior art keywords
air supply
pipe
supply pipe
pump
air
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PCT/JP2019/018488
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English (en)
Japanese (ja)
Inventor
祐治 兼森
Original Assignee
株式会社酉島製作所
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Publication of WO2019239750A1 publication Critical patent/WO2019239750A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems

Definitions

  • the present invention relates to a vertical shaft pump.
  • the vertical shaft pump disclosed in Patent Document 1 includes an air supply pipe piped outside the pump casing.
  • a double trumpet pipe having an outer cylinder and an inner cylinder is disposed at the lower end of the pump casing, and the lower end (air supply port) of the air supply pipe is connected to the inner cylinder.
  • the upper end (intake port) of the air supply pipe is arranged above the installation floor that closes the upper part of the water absorption tank, that is, above the maximum water level determined for the water absorption tank.
  • An object of the present invention is to provide a vertical shaft pump that can secure the space between the bottom of the water absorption tank and the lower end of the pump casing and can be installed even in a shallow water absorption tank.
  • One aspect of the present invention is disposed in a water absorption tank so as to extend in the vertical direction, and has a pump casing having a trumpet pipe for sucking water in the water absorption tank at a lower end thereof, and is located at a predetermined drainage start water level of the water absorption tank.
  • a pump casing having a trumpet pipe for sucking water in the water absorption tank at a lower end thereof, and is located at a predetermined drainage start water level of the water absorption tank.
  • an impeller disposed above the trumpet pipe in the pump casing, and an intake port at one end disposed outside the pump casing so as to be positioned above a highest water level higher than the drainage start position
  • a first air supply pipe having an air supply port at the other end connected to the trumpet pipe, and the trumpet pipe is disposed in the outer cylinder so as to be positioned directly below the outer cylinder and the impeller.
  • the pump cable is Wherein the inner cylinder and outer ring is always spatially communication, it provides a vertical shaft pump.
  • the first air supply pipe is connected to the flare portion of the inner cylinder of the pump casing, and the dynamic pressure in the flare portion is lower than the dynamic pressure of the upper end opening portion of the inner cylinder.
  • the dynamic pressure in the flare portion is lower than the atmospheric pressure when the water level is higher than the drainage start water level, and becomes higher than the atmospheric pressure when the water level is lower than the drainage start water level. Therefore, the air outside the pump casing does not flow into the inner cylinder when the water level is higher than the drainage start water level, and flows into the inner cylinder when the water level becomes lower than the drainage start water level.
  • the first air supply pipe is connected to the flare portion whose dynamic pressure is lower than that of the upper end opening portion, optimum air supply is possible even if the overall length of the trumpet pipe is short. Therefore, the space
  • Sectional drawing which shows the vertical shaft pump which concerns on 1st Embodiment of this invention.
  • Sectional drawing which shows the air lock state of the pump of FIG.
  • the partially expanded sectional view of FIG. FIG. 4 is a partially enlarged sectional view of FIG. 3.
  • FIG. 4 is a plan view of FIG. 3.
  • the graph which shows the distribution curve of the pressure and speed in the inner cylinder of a trumpet pipe.
  • Sectional drawing which shows a part of vertical shaft pump of 2nd Embodiment.
  • the top view of FIG. Sectional drawing which shows a part of vertical shaft pump of 3rd Embodiment.
  • the top view of FIG. Sectional drawing which shows a part of vertical shaft pump of 4th Embodiment.
  • FIG. 1 shows a vertical shaft pump 10 (hereinafter referred to as “pump”) according to a first embodiment of the present invention.
  • This pump 10 is provided with air supply pipes 30 and 33 outside the pump casing 12, and is switched to a drainage (total water) operation, an air-water mixing operation, and an air lock (drainage shutoff) operation depending on the water level of the water absorption tank 1. It is a standby form.
  • the pump 10 includes a pump casing 12, a rotating shaft 22, and an impeller 25.
  • the water absorption tank 1 in which the pump 10 is disposed three sides between the installation floor 2 and the bottom wall 3 are closed by the side walls 4, and water is drawn from the left side without the side walls 4 in FIG. 5. Inflow.
  • the pump casing 12 is fixed to an installation floor 2 that covers the upper part of the water absorption tank 1 so as to extend in the vertical direction in the water absorption tank 1.
  • the pump casing 12 includes a pumping pipe 13 disposed in the water absorption tank 1 and a discharge pipe 20 disposed on the installation floor 2.
  • the pumping pipe 13 includes a straight pipe 14, a vane casing 15, and a bell mouth 16, which are connected in this order from the upper side to the lower side.
  • the discharge pipe 20 includes a discharge elbow 21 whose central axis is bent by 90 degrees, and is connected to the upper end of the straight pipe 14.
  • a water supply pipe (not shown) for draining downstream is connected to the outlet of the discharge elbow 21.
  • the rotary shaft 22 passes through the discharge elbow 21 and is arranged in the pump casing 12 along the axis of the pumping pipe 13. Referring to FIG. 3, the rotating shaft 22 is rotatably supported by an underwater bearing 23 disposed in a bearing casing 15 a in the straight pipe 14 and the vane casing 15. The upper end of the rotating shaft 22 protrudes outward from the discharge elbow 21, and the penetrating portion thereof is liquid-tightly sealed by a shaft seal device.
  • the impeller 25 is disposed below the bearing casing 15 a so as to be positioned above the bell mouth 16 and is attached to the lower end of the rotary shaft 22.
  • the upper end 25a of the impeller 25 is disposed at the same height as the drainage start water level LWL determined by the specifications.
  • a driving means (not shown) is mechanically connected to the upper end of the rotating shaft 22 protruding from the pump casing 12.
  • the drive means an electric motor or a diesel engine which is one of internal combustion engines is used.
  • the impeller 25 is rotated integrally with the rotary shaft 22, so that the water in the water absorption tank 1 is discharged downstream through the pump casing 12.
  • the preceding standby type pump 10 enables an air lock operation in which a water column WC is held in a pump casing 12, prevents the overwater bearing 23 from being overheated by surrounding water, and allows water to enter the water absorption tank 1.
  • the pump 10 can be continuously operated even in the absence.
  • a first air supply pipe 30 and a second air supply pipe 33 that supply air in the water absorption tank 1 into the pump casing 12 are arranged around the pump casing 12. Yes.
  • the first air supply pipe 30 is provided for switching from the drain operation to the air / water mixing operation
  • the second air supply pipe 33 is provided for switching from the air / water mixing operation to the air lock operation.
  • the state of air supply into the pump casing 12 through the air supply pipes 30 and 33 is switched by the dynamic pressure in the pump casing 12.
  • the preceding standby type pump 10 is started by an operator based on information of a local weather observation system, for example. Since the impeller 25 is in the air at the beginning when the water level in the water absorption tank 1 is lower than that of the impeller 25, the pump 10 is operated in the air without draining. When the water level rises above the lower end of the impeller 25, the water in the water absorption tank 1 is sucked up by the impeller 25 and air is sucked in through the first air supply pipe 30, so that the pump 10 is in a mixed state of water and air. Switch to air / water mixing operation. When the water level rises above the drainage start water level LWL (the upper end 25a of the impeller 25), the suction of air through the first air supply pipe 30 is shut off, so the pump 10 is switched to a drainage operation that discharges only water. Change.
  • LWL the upper end 25a of the impeller 25
  • the aforementioned drainage start water level LWL, drainage cutoff water level LLWL, and maximum water level HWL are defined as required specifications. These are defined as heights from the bottom wall 3 and are set to increase in the order of the drainage cutoff water level LLWL, the drainage start water level LWL, and the highest water level HWL, as shown in FIG.
  • At high water levels above the drainage start water level LWL it is necessary to discharge only water without mixing air.
  • At a low water level lower than the drainage start water level LWL mixing of air is allowed.
  • an ultra-low water level below the drainage cut-off water level LLWL it is necessary to shift to an air lock operation without draining.
  • connection position of the air supply pipe is set based on the set drainage start water level LWL and the maximum load in the pump casing, a long bell mouth may be required, In this case, it could not be applied to a water absorption tank having a shallow bottom. Therefore, in the present embodiment, by optimizing the connection position between the first supply pipe 30 and the pump casing 12, the first supply pipe 30 enters the pump casing 12 without increasing the overall length of the bell mouth 16. It is possible to supply air at a predetermined timing. Further, by optimizing the shape and connection position of the second air supply pipe 33, the air supply for pumping off is made more efficient.
  • the bell mouth 16 is constituted by a double trumpet tube including an outer cylinder 17 and an inner cylinder 18.
  • the 1st air supply piping 30 is connected to the flare part 18b with comparatively low dynamic pressure of the inner cylinder 18.
  • the second air supply pipe 33 is connected to the cylinder portion 18 a having a relatively high dynamic pressure in the inner cylinder 18.
  • the bell mouth 16 includes an outer cylinder 17 connected to the lower end of the vane casing 15, an inner cylinder 18 disposed in the outer cylinder 17, and two or more connecting plates 19 that connect these. Is provided.
  • the outer tube 17 includes a cylindrical tube portion 17a and a flare portion 17b continuous with the lower end of the tube portion 17a.
  • a flange portion 17c that is fastened to the vane casing 15 by a bolt is provided at the upper end of the cylindrical portion 17a.
  • the flare portion 17b has a conical cylinder shape that gradually expands from the upper end toward the lower end.
  • the inner cylinder 18 is disposed in the outer cylinder 17 so as to be located immediately below the impeller 25, and protrudes downward from the lower end of the outer cylinder 17.
  • the inner cylinder 18 includes a cylindrical tube portion 18a positioned on the same axis as the rotation shaft 22, and a flare portion 18b continuous with the lower end of the tube portion 18a.
  • the upper end of the cylinder part 18 a is located at the middle part in the vertical direction of the flare part 17 b of the outer cylinder 17, and is arranged at the same position as the pumping cutoff water level LLWL.
  • the flare portion 18b has a conical cylinder shape that gradually spreads from the upper end toward the lower end.
  • the maximum outer diameter of the flare part 18b is smaller than the minimum inner diameter of the outer cylinder 17 (cylinder part 17a).
  • the inner edge portion 19 a of the connecting plate 19 has a shape along the outer surface shape from the upper end to the lower end of the inner tube 18, and is joined to the outer surface of the inner tube 18.
  • the outer edge portion 19 b of the connecting plate 19 has a shape along the inner surface shape from the vicinity of the upper end of the outer cylinder 17 to the vicinity of the lower end thereof, and is joined to the inner surface of the outer cylinder 17.
  • a lower edge portion 19c extending from the lower end of the inner edge portion 19a to the lower end of the outer edge portion 19b protrudes downward from the outer cylinder 17 and is inclined outward from the lower side toward the upper side.
  • An upper edge portion 19d extending from the upper end of the inner edge portion 19a to the upper end of the outer edge portion 19b is accommodated in the outer cylinder 17, and is inclined outward from the lower side toward the upper side.
  • the underwater vortex is a water flow in which air is continuously or intermittently contained in the water flowing from the bottom wall 3 of the water absorption tank 1 toward the bell mouth 16. Since the underwater vortex interferes with the inner cylinder 18 and the connecting plate 19 projecting radially, the underwater vortex can be eliminated, so that the water in the water absorption tank 1 can be effectively drained to a low water level.
  • FIG. 6 is a graph showing the pressure and speed in the inner cylinder 18.
  • the horizontal axis shows the distance (m) from the lower end of the inner cylinder 18, and the vertical axis shows the magnitude of pressure and speed.
  • the internal pressure gradually increases and the internal flow rate gradually increases from the lower end of the inner cylinder 18 toward the upper end. That is, the dynamic pressure in the inner cylinder 18 is lowest at the lower end and becomes higher toward the upper end. Therefore, by adjusting the connection position of the first air supply pipe 30 with respect to the inner cylinder 18, the suction lift ⁇ Ha due to the maximum negative pressure during operation can be adjusted regardless of the depth of the water absorption tank 1.
  • the first air supply pipe 30 is a pipe having an intake port 30 a at the upper end and an air supply port 30 b at the lower end, and always makes the inside and outside of the pump casing 12 communicate spatially. Yes. Most of the first air supply pipe 30 is disposed outside the pump casing 12 and extends in the vertical direction along the pump casing 12.
  • the intake port 30a is disposed in the water absorption tank 1 and is located above the highest water level HWL.
  • a folded portion 30c that is folded in a U shape is provided on the upper portion of the first air supply pipe 30 so that the intake port 30a opens downward.
  • the inner top portion of the folded portion 30 c is the highest position in the first air supply pipe 30.
  • the height of the first air supply pipe 30 from the bottom wall 3 to the inner top portion of the folded portion 30c is set to a value obtained by adding the suction head ⁇ Ha due to the maximum negative pressure generated in the inner cylinder 18 by pumping to the maximum water level HWL. Has been.
  • connection portion 30 d that is bent toward the bell mouth 16 and is connected to the inner cylinder 18 through the outer cylinder 17 is formed at the lower portion of the first air supply pipe 30. .
  • the portion of the outer cylinder 17 through which the connection portion 30d passes is sealed in a liquid-tight manner.
  • An air supply port 30b which is the tip of the connection portion 30d is connected to the flare portion 18b of the inner cylinder 18.
  • the diameter D1 of the flare portion 18b to which the connection portion 30d (air supply port 30b) is connected is 1.4 times or more the diameter D2 of the cylindrical portion 18a. That is, the connecting portion 30d is connected to a portion of the flare portion 18b that is 1.4 times or more the diameter D2 of the cylindrical portion 18a.
  • the cross-sectional area of the connection portion of the first air supply pipe 30 is at least twice the cross-sectional area of the upper end opening of the inner cylinder 18.
  • the dynamic pressure at this connecting portion is 40% of the dynamic pressure at the upper end of the inner cylinder 18.
  • connection position of the connection part 30d with respect to the flare part 18b is set based on the following equation.
  • ⁇ Ha is a suction head (suction loss) of the inner cylinder 18
  • ⁇ a is a loss factor in the inner cylinder 18
  • Vd is a suction port speed in the inner cylinder 18
  • Vs is a suction port speed between the outer cylinder 17 and the inner cylinder 18.
  • Dd is the inner diameter of the inner cylinder 18
  • Dd is the minimum inner diameter of the outer cylinder 17.
  • the suction head ⁇ Ha at an arbitrary position of the inner cylinder 18 can be calculated from the suction port speed Vd of the inner cylinder 18 and the loss coefficient ⁇ a. Therefore, the magnitude
  • DELTA size of suction lift
  • the air supply is at a position where the dynamic pressure is higher than the atmospheric pressure.
  • the mouth 30b is connected.
  • the air outside the pump casing 12 does not flow into the inner cylinder 18 when the water level is higher than the drainage start water level LWL, and flows into the inner cylinder 18 when the water level becomes lower than the drainage start water level LWL.
  • the operation proceeds to the air-water mixing operation.
  • the intake port 30a is opened at a position higher than the maximum water level HWL, and the supply port 30b is connected to the predetermined diameter portion of the flare portion 18b. Air supply is possible. Therefore, since the space
  • the intake port 30a of the first air supply pipe 30 is opened in the water absorption tank 1, drainage does not catch up due to an unintended abnormality, and even when the water in the water absorption tank 1 flows back through the first air supply pipe 30, The water can be returned to the water absorption tank 1. Therefore, it is possible to suppress leakage of water onto the installation floor 2 on which the control base is arranged.
  • the second air supply pipe 33 is a pipe that is bent in a generally inverted U shape, and allows the inside and outside of the pump casing 12 to always communicate spatially. Most of the second air supply pipe 33 is disposed outside the pump casing 12 and extends in the vertical direction along the pump casing 12. One end of the second air supply pipe 33 constitutes the air inlet 33a, and the other end of the second air supply pipe 33 constitutes the air inlet 33b.
  • the intake port 33 a is formed at the lower end of the first pipe portion 33 c located away from the pump casing 12.
  • the intake port 33a is preferably arranged at a height equal to or lower than the pumping cutoff water level LLWL, and is arranged at the same height in this embodiment. That is, the first pipe portion 33c is disposed outside the pump casing 12 so that the intake port 33a is disposed at a predetermined position.
  • the air supply port 33b is formed at the end of the second pipe portion 33d located closer to the pump casing 12 than the first pipe portion 33c.
  • the first tube portion 33c and the second tube portion 33d are continuous via a folded portion 33e that is folded back in a U shape. Similar to the folded portion 30c of the first air supply pipe 30, the height of the second air supply pipe 33 from the bottom wall 3 to the inner top portion of the folded portion 33e is set to a value obtained by adding the suction head ⁇ Ha to the maximum water level HWL. Has been.
  • connection portion 33 f that is bent toward the bell mouth 16 and is connected to the inner tube 18 through the outer tube 17 is formed at the lower portion of the second tube portion 33 d.
  • the portion through which the connecting portion 33f of the outer cylinder 17 penetrates is liquid-tightly sealed.
  • the connecting portion 33f is located at the same height as the pumping cutoff water level LLWL and extends horizontally in the radial direction of the pump casing 12.
  • the air supply port 33b which is the tip of the connection portion 33f is connected to the upper end of the cylindrical portion 18a of the inner cylinder 18 so as to be positioned above the air supply port 30b of the first air supply pipe 30.
  • the second air supply pipe 33 is arranged such that the intake port 33a is positioned at a height equal to or lower than the pumping cutoff water level LLWL, and the air supply port 33b is connected to the inner cylinder 18. Therefore, since the air can be supplied from the intake port 33a into the pump casing 12 only when the water level drops to the pumping cutoff water level LLWL, the pump 10 can be shifted from the air / water mixing operation to the air lock operation.
  • the air supply port 33b of the second air supply pipe 33 is disposed above the air supply port 30b and is connected to the upper end of the inner cylinder 18, so that turbulent flow and separation flow (inner It is not influenced by the water flow faster than the water flow around the cylinder 18. Therefore, it is possible to promptly shift to the pumping off operation.
  • the second air supply pipe 33 includes the connection portion 33f positioned at the pumping cutoff water level and has the air supply port 33b at the tip thereof, the air flow resistance can be reduced, and the air for shutting off the pumping water is efficiently used. Can supply.
  • each air supply piping (Arrangement of each air supply piping) Referring to FIG. 5, two first air supply pipes 30 are arranged so as to be located upstream of the pump casing 12 in the water inflow direction F. Two second air supply pipes 33 are arranged so as to be located downstream of the pump casing 12 in the inflow direction F. A total of four air supply pipes 30 and 33 are arranged radially about the axis of the pump casing 12.
  • the supply pipes 30 and 33 and the pump casing 12 are preferably connected by a known connecting member (for example, a stay).
  • a portion of the first air supply pipe 30 above the connection portion 30d and the pipe parts 33c and 33d of the second air supply pipe 33 are located at the position where the air suction vortex is generated, which is assumed by actual measurement or calculation.
  • the pump casing 12 is arranged at a predetermined interval.
  • the air suction vortex is a water flow in which the air in the water absorption tank 1 is continuously or intermittently contained in the water flowing from the water surface side toward the suction port of the bell mouth 16. This air suction vortex is generated when the water level in the water absorption tank 1 is lowered and the flow velocity on the water surface reaches a certain level.
  • the water flow from the water surface toward the bell mouth 16 interferes with the air supply pipes 30 and 33, so that the water flow can be eliminated before the air is sucked.
  • the pump 10 thus configured has the functions of suppressing the generation of submerged vortices, suppressing the generation of air suction vortices, and the preceding standby operation, the pump 10 does not have the first air supply pipe 30 and the second air supply pipe 33. Effective drainage at low water levels.
  • the generation of air suction vortices can be suppressed by the air supply pipes 30 and 33.
  • the generation of underwater vortices can be suppressed by the bell mouth 16 formed of a double trumpet tube. Therefore, vibration of the pump casing 12 due to the sucked air colliding with the impeller 25 can be prevented.
  • the air in the water absorption tank 1 can be supplied from the first air supply pipe 30 into the pump casing 12 by the suction force of the pump 10 (dynamic pressure of the inner cylinder 18). Therefore, although the amount of water absorption from the bell mouth 16 is reduced, the flow velocity on the water surface in the water absorption tank 1 is slowed, so that the generation of air suction vortex can be suppressed and the water level that can be drained can be lowered. However, even in this case, as the water level becomes lower, the water surface eventually becomes a flow velocity at which air suction vortices are generated, but the generation of air suction vortices at this time can also be suppressed by the air supply pipes 30 and 33.
  • the amount of water absorbed from the bell mouth 16 is further reduced by sucking air from the second air supply pipe 33. Therefore, drainage from the pump casing 12 to the downstream side can be stopped reliably, and the state in which the water column WC is held in the pump casing 12 can be maintained as shown in FIG.
  • the water column WC cools the submersible bearing 23 which is a sliding component in the pump casing 12 and prevents overheating. Therefore, a standby operation in which the pump 10 is continuously driven can be realized.
  • the first air supply pipe 30 is connected to a portion where the dynamic pressure of the inner cylinder 18 is low. Is possible. Therefore, even if it is the shallow water absorption tank 1, the pump 10 can be installed reliably.
  • the bell mouth 16 composed of a double trumpet pipe can suppress the generation of underwater vortices, and the four air supply pipes 30 and 33 can suppress the generation of air suction vortices, the water level that can be drained by the pump 10 is effective. Can be lowered.
  • the total height of the first air supply pipe 30 and the second air supply pipe 33 is set to be higher than the maximum water level HWL plus the suction lift ⁇ Ha, so that water is sucked up over the folded portions 30c and 33e. It will never be done. Therefore, it is possible to prevent dust and the like from flowing into the first air supply pipe 30 and the second air supply pipe 33 and clogging at the folded portions 30c and 33e.
  • the air supplied to the inner cylinder 18 is introduced into the central portion of the impeller 25, the load on the impeller 25 due to air injection can be made smaller than when it is introduced from the outer periphery. Therefore, vibration of the pump 10 due to switching of the operation state can be suppressed.
  • (Second Embodiment) 7 and 8 show the pump 10 of the second embodiment.
  • the second air supply pipe 40 for switching the pump 10 from the air / water mixing operation to the air lock operation is incorporated in the vortex prevention pipe 35 for suppressing the generation of the air suction vortex. It is different from the embodiment.
  • the vortex prevention pipe 35 includes an annular horizontal pipe 36 that surrounds the pump casing 12 below the drainage start water level LWL, and a straight tubular pipe that is disposed outside the pump casing 12 so as to extend in the vertical direction. And a vertical pipe 37.
  • the second air supply pipe 40 of the second embodiment includes an intake pipe 41 arranged in the vertical pipe 37 and an air supply pipe 42 arranged between the horizontal pipe 36 and the pump casing 12.
  • the horizontal pipe 36 is a hollow annular pipe and is disposed on the outer periphery of the bell mouth 16.
  • the inner diameter of the horizontal pipe 36 is substantially the same as the maximum outer diameter of the outer cylinder 17.
  • the horizontal pipe 36 is disposed at the same height as the minimum outer diameter portion of the outer cylinder 17 so as to be positioned coaxially with the pump casing 12 and is connected by a rib (not shown). Thereby, a defined gap (flow path) is formed between the horizontal pipe 36 and the outer cylinder 17.
  • the vertical pipe 37 is a hollow straight pipe, and its upper end is closed liquid-tight and air-tightly by a cover 37a.
  • the lower end of the vertical pipe 37 is connected to the horizontal pipe 36 so as to communicate with the horizontal pipe 36 spatially.
  • four vertical pipes 37 are arranged at a predetermined interval in the circumferential direction around the pump casing 12.
  • the upper end of the vertical pipe 37 is disposed at a position higher than the upper end (exhaust port 41c) of the intake pipe 41.
  • the first air supply pipe 30 of the second embodiment is arranged so as to be located outside the horizontal pipe 36.
  • the connection portion 30d is bent at the same height as the horizontal pipe 36, and the air supply port 30b at the tip is connected to the flare portion 18b of the inner cylinder 18 as in the first embodiment.
  • the intake pipe 41 of the second air supply pipe 40 is a substantially straight pipe disposed in the vertical pipe 37.
  • a bent portion 41 b that is bent outward is provided at the lower end of the intake pipe 41.
  • the bent portion 41b passes through the horizontal pipe 36 located at the drainage cutoff water level LLWL, and the portion of the horizontal pipe 36 through which the bent portion 41b passes is liquid-tightly sealed.
  • the air inlet 41a at the tip of the bent portion 41b is located at the same height as the drain cutoff water level LLWL and is exposed in the water absorption tank 1.
  • the intake pipe 41 extends to a position higher than a position obtained by adding the suction lift ⁇ Ha to the highest water level HWL, and an exhaust port 41 c at the upper end opens in the vertical pipe 37.
  • the air supply pipe 42 of the second air supply pipe 40 is a straight pipe, the air supply port 42 a at the inner end is connected to the cylindrical portion 17 a of the outer cylinder 17, and the connection port 42 b at the outer end is connected to the inner side of the horizontal pipe 36. Connected to the lap.
  • the air supply pipe 42 communicates with the intake pipe 41 via the vertical pipe 37 and the horizontal pipe 36, and the second air supply pipe 40 also uses the vortex prevention pipe 35 as a flow path.
  • the air supply port 42 a of the air supply pipe 42 is connected to the outer cylinder 17 constituting the bell mouth 16 so as to be positioned above the air supply port 30 b of the first air supply pipe 30.
  • intake pipes 41 are arranged in four vertical pipes 37, respectively.
  • Four air supply pipes 42 are arranged at equal intervals in the circumferential direction with the pump casing 12 as the center.
  • the four air supply pipes 42 and the four vertical pipes 37 are arranged at intervals in the circumferential direction, and are configured such that the angular positions in plan view do not coincide with each other.
  • the air flowing into the horizontal pipe 36 from the vertical pipe 37 does not flow directly to the air supply pipe 42 but always flows through the horizontal pipe 36 to the air supply pipe 42, and from the air supply pipe 42 to the inside of the bell mouth 16.
  • the vibration of the pump 10 due to the supply air being biased locally is suppressed.
  • the pump 10 of the second embodiment in the drainage operation, even if the water level in the water absorption tank 1 becomes the vortex generation water level, the generation of the air suction vortex can be suppressed by the vortex prevention pipe 35. Further, in the air / water mixing operation, the air in the water absorption tank 1 can be supplied from the first air supply pipe 30 into the pump casing 12 by the suction force of the pump 10. In the air lock operation, the air sucked from the intake port 41 a is supplied into the pump casing 12 via the intake pipe 41, the vertical pipe 37, the horizontal pipe 36, and the air supply pipe 42.
  • the distance between the bottom wall 3 of the water absorption tank 1 and the lower end of the pump casing 12 can be secured as in the first embodiment, and the shallow water absorption tank 1 is used. Even the pump 10 can be installed. Further, since the bell mouth 16 composed of a double trumpet pipe can suppress the generation of underwater vortices, and the four vertical pipes 37 constituting the vortex prevention pipe 35 can suppress the generation of air suction vortices. The water level can be effectively lowered.
  • (Third embodiment) 9 and 10 show the pump 10 of the third embodiment.
  • the third embodiment is different from the second embodiment in that the first air supply pipe 45 that switches the pump 10 from the drain operation to the air / water mixing operation is incorporated in the vortex prevention pipe 35.
  • the vortex prevention pipe 35 includes one horizontal pipe 36 and four vertical pipes 37 as in the second embodiment.
  • one vertical pipe 37 ⁇ / b> A located on the upstream side in the inflow direction F is connected to the horizontal pipe 36 so as not to spatially communicate with the inside of the horizontal pipe 36.
  • the remaining vertical pipe 37 ⁇ / b> B is connected to the horizontal pipe 36 so as to communicate spatially with the inside of the horizontal pipe 36.
  • the intake pipe 41 and the supply pipe 42 which comprise the 2nd supply pipe 40 are connected to the vertical pipe 37B and the horizontal pipe 36 similarly to 2nd Embodiment.
  • the first air supply pipe 45 of the third embodiment has a configuration in which the vertical pipe 37A of the vortex prevention pipe 35 is also used as an intake pipe, and the air supply pipe 46 is connected to the lower end of the vertical pipe 37A.
  • the upper end of the vertical pipe 37A constituting the intake pipe is closed by a cover 37a as in the first embodiment.
  • the vertical pipe 37A is provided with an intake port 37b so as to be positioned above the highest water level HWL.
  • the air supply pipe 46 is connected to the lower end of the vertical pipe 37 so as to be spatially continuous with the inside of the vertical pipe 37A.
  • two air supply pipes 46 are used, and air can be supplied to the flare portion 18b of the inner cylinder 18 from different positions spaced by 45 degrees.
  • each air supply pipe 46 includes a continuous portion 46 b that extends in the circumferential direction around the rotation shaft 22, and a connection portion 46 c that is bent from the tip of the continuous portion 46 b.
  • the connection part 46c penetrates the outer cylinder 17 similarly to each embodiment, and the air supply port 46a at the tip is connected to the flare part 18b of the inner cylinder 18.
  • the operation is switched to the drainage operation, the air / water mixing operation, and the air lock operation according to the water level in the water absorption tank 1. Therefore, the same operation and effect as each embodiment can be obtained. Further, the first air supply pipe 45 that switches from the drain operation to the air / water mixing operation and the second air supply pipe 40 that switches from the air / water mixing operation to the air lock operation suppress the generation of the air suction vortex 35. Therefore, the piping structure arranged outside the pump casing 12 can be simplified.
  • FIG.11 and FIG.12 shows the pump 10 of 4th Embodiment.
  • the fourth embodiment is different from the third embodiment in that the fluidity of air supplied via the vortex prevention pipe 35 is improved.
  • the vortex prevention pipe 35 of the fourth embodiment includes an annular horizontal pipe 36 and four vertical pipes 37A and 37B, as in the third embodiment.
  • a bent portion 37 c that is bent inward in the radial direction of the pump casing 12 toward the bell mouth 16 is provided below the vertical pipes 37 ⁇ / b> A and 37 ⁇ / b> B.
  • the inclination angle of the bent portion 37c with respect to the portion extending along the axis of the pump casing 12 is set in a range wider than 90 degrees and narrower than 180 degrees, and is set to 157.5 degrees in this embodiment.
  • the air supply pipe 46 of the first air supply pipe 45 is connected to the lower end of the vertical pipe 37A as in the third embodiment.
  • the intake pipe 41 of the second air supply pipe 40 passes through the bent portion 37c of the vertical pipe 37B, and is arranged so that the intake port 41a is located at the drainage cutoff water level LLWL.
  • the portion of the bent portion 37c that penetrates the intake pipe 41 is liquid-tightly sealed.
  • the same operations and effects as those of the third embodiment can be obtained.
  • the bent portions 37c are provided in the vertical pipes 37A and 37B, the flow resistance of air to the outer cylinder 17 and the inner cylinder 18 can be reduced. Therefore, the air for switching to the air / water mixing operation and the air lock operation can be efficiently supplied.
  • the vertical shaft pump 10 of the present invention is not limited to the configuration of the above embodiment, and various modifications can be made.
  • the inner cylinder 18 of the bell mouth 16 may be configured not to protrude downward from the outer cylinder 17.
  • the intake ports 30 a and 37 b of the air supply pipes 30 and 45 may be arranged on the installation floor 2.
  • the air supply pipe 42 of the second air supply pipe 40 shown in the second to fourth embodiments may be connected to the inner cylinder 18 through the outer cylinder 17, as in the first embodiment.
  • the first supply pipes 30 and 45 and the second supply pipes 33 and 40 may be provided with orifices (throttles). Even when the vortex prevention pipe 35 is arranged, the first air supply pipe 30 and the second air supply pipe 33 shown in the first embodiment may be independently piped.
  • Inlet port 42b Connection port 45 ... First Air supply pipes 46 ... air supply pipe 46a ... air supply port 46b ... continuous portion 46c ... connecting portion LWL ... drainage starting level LLWL ... drainage blocking level HWL ... High Water WC ... water column

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne une pompe à arbre vertical (10) est pourvue : d'un boîtier de pompe (12) qui est disposé dans un réservoir d'aspiration d'eau (1) de façon à s'étendre dans la direction verticale ; d'une roue à aubes (25) qui est disposée dans une partie supérieure d'un tube de conduit (16) à l'intérieur du boîtier de pompe (12) ; et d'un premier tuyau d'alimentation en air (30) qui est disposé à l'extérieur du boîtier de pompe (12). Une ouverture d'admission d'air (30a) du premier tuyau d'alimentation en air (30) est positionnée plus haut qu'un niveau d'eau le plus élevé qui est supérieur à une position d'initiation d'évacuation d'eau (LWL), tandis qu'une ouverture d'alimentation en air (30b) du premier tuyau d'alimentation en air (30) est reliée au tube de conduit (16). Le tube de conduit (16) est pourvu d'un tube externe (17) et d'un tube interne (18) ayant une partie évasée (18b), tandis que l'ouverture d'alimentation en air (30b) du premier tuyau d'alimentation en air (30) est reliée à cette partie évasée (18b) du tube interne (18).
PCT/JP2019/018488 2018-06-13 2019-05-09 Pompe à arbre vertical WO2019239750A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018112939A JP6985985B2 (ja) 2018-06-13 2018-06-13 先行待機形ポンプ
JP2018-112939 2018-06-13

Publications (1)

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WO2019239750A1 true WO2019239750A1 (fr) 2019-12-19

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JP (1) JP6985985B2 (fr)
WO (1) WO2019239750A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4417850A (en) * 1982-12-20 1983-11-29 Allis-Chalmers Corporation Vertical column pump
JP2004176567A (ja) * 2002-11-25 2004-06-24 Torishima Pump Mfg Co Ltd 先行待機型立軸ポンプ
JP2004239215A (ja) * 2003-02-07 2004-08-26 Ebara Corp 立軸ポンプ
JP2004308508A (ja) * 2003-04-04 2004-11-04 Ebara Corp 水中モータポンプ及び水中モータポンプの運転方法
JP4690134B2 (ja) * 2005-07-19 2011-06-01 株式会社荏原製作所 立軸ポンプおよびポンプ機場
JP2012052440A (ja) * 2010-08-31 2012-03-15 Torishima Pump Mfg Co Ltd ポンプ機場

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4417850A (en) * 1982-12-20 1983-11-29 Allis-Chalmers Corporation Vertical column pump
JP2004176567A (ja) * 2002-11-25 2004-06-24 Torishima Pump Mfg Co Ltd 先行待機型立軸ポンプ
JP2004239215A (ja) * 2003-02-07 2004-08-26 Ebara Corp 立軸ポンプ
JP2004308508A (ja) * 2003-04-04 2004-11-04 Ebara Corp 水中モータポンプ及び水中モータポンプの運転方法
JP4690134B2 (ja) * 2005-07-19 2011-06-01 株式会社荏原製作所 立軸ポンプおよびポンプ機場
JP2012052440A (ja) * 2010-08-31 2012-03-15 Torishima Pump Mfg Co Ltd ポンプ機場

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JP6985985B2 (ja) 2021-12-22

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