JPH1089300A - How to recover residual water in the tank - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily collect residual water in a water tank to make the amount of residual water almost zero, and to prevent scum and sand from being deposited on the bottom of the water tank. SOLUTION: A directivity which has a peripheral wall 3A and a bottom wall 3C having an open upper end, and can generate a swirling flow S in the same direction as the rotation direction R of the pump P inside the peripheral wall 3A at an eccentric position of the peripheral wall 3A. The pre-swirling tank 3 in which the inflow path 3D of is formed,
The pre-swirling tank 3 is installed in the water tank 1 with the bottom wall 3C positioned at a lower level than the bottom 1A of the water tank 1, and the pump P is inserted inside the peripheral wall 3A, so that the outer circumference of the pump P An annular flow path 4 surrounded by the inner circumference of the peripheral wall 3A and communicating with the inflow path 3D is formed.
The remaining water is introduced from the inflow channel 3D into the annular flow channel 4 and pre-swirled to drain.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for easily recovering residual water in a water tank so that the amount of residual water can be almost reduced to zero, and to prevent scum and sand from accumulating on the bottom of the water tank over time. The present invention relates to a method for recovering residual water in a water tank to be prevented.

[0002]

2. Description of the Related Art Generally, water stored in a water tank 1 shown in FIG.
It is drained by charging and operating the submersible pump P1. However, a relatively large amount of water corresponding to the level of the suction port 2 of the submersible pump P1 remains as residual water. However, even if there is a demand to easily recover the residual water and make the residual water amount almost zero, it is quite difficult to easily recover the residual water. In addition, there is a problem that scum, sand, and the like are deposited on the bottom 1A of the water tank 1 over time.

[0003]

That is, conventionally, it is considerably difficult to easily recover the residual water even if there is a demand to make the residual water amount almost close to zero.
A relatively large amount of water remains as residual water, and sedimentation and scum accumulate on the bottom of the water tank with the lapse of time.

[0004] Accordingly, the present invention provides a method for easily recovering residual water in a water tank to reduce the amount of residual water to almost zero and to prevent sedimentation such as sedimentation or scum on the bottom of the water tank. It aims to provide a method for recovering residual water.

[0005]

In order to achieve the above object, the present invention has a bottom wall for closing a lower end of a peripheral wall, and the eccentric position of the peripheral wall is the same as the rotation direction of the pump inside the peripheral wall. A pre-swirl tank in which a directional inflow path capable of generating a swirling flow in the direction is provided, and an upper end opening of the peripheral wall and an inlet of the inflow path are communicated with the bottom of the water tank so that the bottom wall of the water tank is formed. By installing the pre-swirling tank in the water tank in a state where it is positioned at a lower level than the bottom, and by inserting a pump inside the peripheral wall, it is surrounded by the outer periphery of the pump and the inner periphery of the peripheral wall,
In addition, an annular flow path communicating with the inflow path is formed, and residual water in the water tank is introduced from the inflow path to the annular flow path and drained by operating the pump.

According to the present invention, when it is necessary to recover the residual water, a pump is inserted inside the peripheral wall of the pre-swirling tank, and by operating this pump, the residual water in the water tank is reduced. It flows into the annular flow path from the inflow path. In the annular flow path, the residual water is in the direction of rotation of the pump (specifically, the direction of rotation of the pump impeller).
It is swirled in the same direction as above, and is sucked from the entire circumference of the suction port of the pump and is effectively collected. As the residual water flows from the inflow channel into the annular flow path, sedimentation and scum flow into the annular flow path, and in the annular flow path, the residual water is swirled in the same direction as the rotation direction of the pump. It is collected on the bottom wall just below the suction port of the pump, and is sucked into the suction port together with residual water and collected.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is an enlarged cross section taken along line AA in FIG. 1, and FIG. 3 is a cross section taken along line BB in FIG. Note that FIG.
The same or corresponding parts as those of the conventional example are denoted by the same reference numerals and described. In FIG. 1 to FIG. 3, a pre-rotation tank 3 is provided at a corner of a flat bottom 1A of a water tank 1 made of reinforced plastic.
Is installed. The pre-swirling tank 3 is formed of reinforced plastic and has a circular peripheral wall 3A having an open upper end.
And a flange 3B that is inclined upward and expands outward from the entire periphery of the upper end of the peripheral wall 3A, and a bottom wall 3C that closes the lower end of the peripheral wall 3A, and is tangential to or close to the tangential direction of the peripheral wall 3A. An inflow passage 3D directed in the direction and connected to the inside of the peripheral wall 3A is formed so as to be recessed into the flange portion 3B in a state of being inclined downward from the inlet 3d1 to the outlet 3d2. Therefore, the pre-swirl tub 3 is installed in the water tub 1 by connecting the outer end face of the flange 3B and the end face of the entrance 3d1 of the inflow passage 3D flush with the bottom 1A. This allows
The bottom wall 3C is located at a lower level than the bottom 1A of the water tank 1.

Further, by inserting the pump P inside the peripheral wall 3A, an annular flow path 4 which is surrounded by the outer periphery of the pump P and the inner periphery of the peripheral wall 3A and communicates with the inflow passage 3D is formed. . The pump P is smaller than the submersible pump P1.

With such a configuration, first, the submerged pump P1 is charged and operated in the same manner as in the prior art.
Water level L corresponding to the level of suction port 2 of submersible pump P1
Water can be drained to WL, and a relatively large amount of water corresponding to the water level LWL remains.

If there is a request to recover residual water, a pump P is inserted inside the peripheral wall 3A of the pre-swirling tank 3, and the pump P
To drive. Thereby, the residual water in the water tank 1 is
Collected by As the level of residual water drops,
The residual water flows into the annular flow path 4 from the inflow path 3D. In the annular flow path 4, the residual water turns S in the same direction as the pump rotation direction (specifically, the rotation direction of the pump impeller) R, is sucked from the entire circumference of the suction port 2 of the pump P, and is effectively collected. Is done. Further, scum and sand flow into the annular flow path 4 along with the residual water flowing into the annular flow path 4 from the inflow path 3D,
In the annular flow path 4, together with the residual water, it turns in the same direction S as the rotation direction R of the pump P and is collected on the bottom wall 3 </ b> C immediately below the suction port 2 of the pump P, and is sucked into the suction port 2 with the residual water. Collected.

That is, the residual water in the water tank 1 is easily collected, and the residual water amount is made almost zero (in practice, the pre-rotation tank 3
A small amount of residual water can be recognized on the bottom wall 3C of the peripheral wall 3A), and the accumulation of scum, sand, and the like on the bottom 1A of the water tank 1 can be prevented.

In the above-described embodiment, the combination of the reinforced plastic water tank 1 and the reinforced plastic pre-swirl tank 3 is described, but the water tank 1 and the pre-swirl tank 3 are combined.
Is a combination of a metal water tank 1 and a metal pre-rotation tank 3
Combination of a metal water tank 1 and a pre-swirl tank 3 made of reinforced plastic, a combination of a concrete water tank 1 and a pre-swirl tank 3 of concrete, a concrete water tank 1 and a pre-swirl tank 3 of metal And a combination of a concrete water tank 1 and a reinforced plastic pre-rotation tank 3 can be employed.

In the above embodiment, the water tank 1 is provided with one pre-swirl tank 3, but the water tank 1 is provided with two or more pre-swirl tanks 3.
May be provided. Further, the bottom 1A of the water tank 1 may not be flat as in the above-described embodiment, but may be formed by an inclined surface that is inclined downward toward the pre-swirling tank 3.

Further, as shown in FIG. 3, an inflow passage 3D connected to the inside of the peripheral wall 3A is formed so as to be recessed from the inlet 3d1 to the outlet 3d2 so as to be recessed into the flange 3B in a state of being inclined downward. Instead of the inflow channel 3D inclined at a gradient, as shown by the two-dot chain line X1, the inlet 3d1 and the outlet 3d
An inflow path 3D in which 2 is at the same level may be formed. In addition, as shown by the alternate long and short dash line X2, the entrance 3 is at an intermediate height.
An inflow path 3D provided with d1 and an outlet 3d2 may be formed.

[0015]

As described above, according to the present invention,
When it is necessary to collect residual water, a pump is inserted inside the peripheral wall of the pre-swirling tank, and by operating this pump, residual water in the water tank flows into the annular flow path from the inflow path. And
In the annular flow path, the residual water turns in the same direction as the rotation direction of the pump, is sucked from the entire circumference of the suction port of the pump, and is effectively collected. Also, as the residual water flows from the inflow channel into the annular flow path, scum and sand flow into the annular flow path,
In the annular flow path, it is swirled together with the residual water in the same direction as the rotation direction of the pump, collected on the bottom wall just below the suction port of the pump, and sucked into the suction port together with the residual water to be collected. The residual water in the water tank can be easily collected, the residual water amount can be made almost zero, and scum and sand can be prevented from being deposited on the bottom of the water tank.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 4 is a longitudinal sectional view of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 water tank 1A bottom of water tank 3 pre-rotation tank 3A peripheral wall of pre-rotation tank 3C bottom wall of pre-rotation tank 3D inflow path of pre-rotation tank 3d1 inlet of inflow path 4 annular flow path P pump R rotation direction of pump S swirl flow

Claims (1)

[Claims] 1. A directional inflow path having a bottom wall for closing a lower end of a peripheral wall and capable of generating a swirling flow in the same direction as the rotation direction of a pump is formed inside the peripheral wall at an eccentric position of the peripheral wall. A pre-swirl tank is provided, and the upper end opening of the peripheral wall and the inlet of the inflow path are communicated with the bottom of the water tank, and the pre-swirl is performed on the water tank with the bottom wall positioned at a lower level than the bottom of the water tank. By installing a tank and charging the pump inside the peripheral wall, it is surrounded by the outer periphery of the pump and the inner periphery of the peripheral wall,
And forming an annular flow path communicating with the inflow path, and introducing residual water in the water tank from the inflow path to the annular flow path by operating the pump to discharge the remaining water in the water tank. Water recovery method.