JPH0667898U - Vortex prevention device for pump water absorption tank - Google Patents

Abstract

(57) [Abstract] [Purpose] The Karman vortex is suppressed from occurring in the downstream region of the partition walls 7 and 7 to reliably prevent the generation of the air suction vortex, and the pump P
Avoid the occurrence of obstacles such as vibration and noise caused by the inhalation of air. [Structure] A plurality of blowing passages 9 for blowing water are provided in the partition walls 7, 7 provided on the upstream side of the pump installation area 1 in the downstream region of the partition walls 7, 7, and water is blown out from these blowing passages 9. This prevents the generation of Karman vortices.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vortex prevention device for a pump water absorption tank.

[0002]

[Prior art]

 As shown in FIGS. 7 and 8, on the upstream side of the pump installation area 1 in which a plurality of pumps P are installed, a plurality of partition walls 7, 7 are provided along the flow direction from the bottom 5 of the upstream area 4 to the ceiling 6. When the pump P is operated in the conventional pump water absorption tank in which a plurality of water channels are formed in the upstream region 4, Karman vortices 8 and 8 are generated in the downstream region of the plurality of partition walls 7 and 7. May develop into an air intake vortex and be sucked into the pump P, causing various obstacles such as vibration and noise in the pump P 2.

[0003]

[Problems to be solved by the device]

 The problem to be solved is that Karman vortices are generated in the downstream region of the partition wall, these Karman vortices develop into air suction vortices and are sucked into the pump, which causes various obstacles such as vibration and noise in the pump. is there.

[0004]

[Means for Solving the Problems]

 According to the present invention, in a pump water absorption tank having a partition wall along the flow direction on the upstream side of the pump installation area, the partition wall is provided with an outlet passage for discharging water in the downstream region of the partition wall, and the Karman We achieved the objective of suppressing the generation of vortices and reliably preventing the generation of air vortices, and avoiding the occurrence of obstacles such as vibration and noise caused by the suction of air by the pump.

[0005]

[Action]

 According to the present invention, since the Karman vortex can be reliably suppressed from being generated by the water flow blown from the blowout passage to the downstream region of the partition wall, the air suction vortex is not sucked into the pump.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a pump water absorption tank to which the present invention is applied, and FIG. 2 is a vertical side view. It should be noted that the same or corresponding parts as those of the conventional pump water absorption tank described in FIGS. 1 and 2, the pump water absorption tank has a step surface 2 that descends at a predetermined inclination angle toward the pump installation area 1 on the upstream side of the pump installation area 1 in which a plurality of pumps P are installed. In addition, the bottom 3 of the pump installation area 1 is formed deeper than the bottom 5 of the upstream area 4 of the step surface 2, and a plurality of partition walls 7, 7 are provided along the flow direction from the bottom 5 of the upstream area 4 to the ceiling 6. In addition, it has a structure in which multiple waterways are formed in the upstream area 4.

As shown in FIGS. 3 and 4, the partition walls 7 and 7 are provided with an inlet 9A at the upstream end face 7A and two outlets 9B and 9B at the chamfered portions 7B and 7B on both sides of the downstream end. A plurality of blow-out passages 9 each having a flat surface and a substantially Y shape are provided at predetermined intervals in the vertical direction.

With such a configuration, when each pump P is operated, water flows between the partition walls 7, 7 in the upstream region 4 and flows into the pump installation region 1, where the water is supplied to each pump P. Inhaled. On the other hand, a part of the water flow generated by the operation of each pump P flows into the passage 9 from the inlet 9A of the blow-out passage 9 provided in plural numbers in the partition walls 7, 7 in the upstream region 4, and passes through the passage 9. As shown by the arrow W, the water is discharged from the outlets 9B, 9B to the downstream region of the partition walls 7, 7 and the water flow W hinders the generation of Karman vortices. Therefore, it is possible to reliably prevent the generation of the air suction vortex, and it is possible to avoid the occurrence of obstacles such as vibration and noise caused by the suction of air by each pump P. That is, unlike the conventional case, the Karman vortex develops into an air suction vortex and is sucked into each pump P, so that various obstacles such as vibration and noise do not occur in the pump P.

In the above embodiment, the inlet 9A is opened in the upstream end surface 7A, and the two outlets 9B, 9B are opened in the chamfered portions 7B, 7B on both sides of the downstream end. However, the present invention is not limited to the above embodiment. That is, as shown in FIG. 5 and FIG. 6, linear outlet passages 9 each having an inlet 9A opened on the upstream end face 7A and one outlet 9B opened on the downstream end face 7C are arranged at predetermined intervals in the vertical direction. A configuration provided with a plurality may be used.

[0010]

[Effect of device]

 As described above, according to the present invention, water is blown from the blowout passage provided in the partition wall to the downstream region of the partition wall to prevent the Karman vortex from being generated, so that the generation of the air suction vortex can be reliably prevented. . Therefore, it is possible to avoid occurrence of obstacles such as vibration and noise caused by the suction of air by the pump.

[Brief description of drawings]

FIG. 1 is a plan view of a pump water absorption tank to which the present invention is applied.

2 is a vertical side view of FIG.

FIG. 3 is an enlarged cross-sectional view showing an example of a blowout passage.

FIG. 4 is a sectional view taken along the line AA in FIG.

FIG. 5 is an enlarged cross-sectional view showing another example of the blowout passage.

6 is a sectional view taken along the line EE of FIG.

FIG. 7 is a plan view showing a conventional pump water absorption tank.

8 is a vertical side view of FIG.

[Explanation of symbols]

 1 Pump installation area 4 Upstream side of pump installation area (upstream area) 7 Bulkhead 9 Blow-out passage P Pump

Claims (1)

[Scope of utility model registration request] 1. A pump water absorption tank in which a partition wall is provided on the upstream side of the pump installation area along the flow direction, wherein the partition wall is provided with a blowout passage for blowing water to a downstream region of the partition wall. Vortex prevention device for pump water absorption tank.