JP3234970B2 - Water level measuring device for pump suction tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water level measuring device for a pump suction tank.

[0002]

2. Description of the Related Art Conventionally, as a water level measuring device of a pump water absorption tank, the one shown in FIGS. 6, 7 and 8 is known. This water level measuring device is composed of, for example, four drain pumps P
A vertical water-proof tube 2 is installed on one side in the width direction of the pump water-absorbing tank 1 on which 1, 1, P2, P3, and P4 are installed, that is, near one width-direction side wall 1A. It has a charged structure.

In the water absorption tank 1 of this type of pump, a difference in water level occurs in the width direction of the water absorption tank 1 due to the operation pattern of the drainage pumps P1, P2, P3, and P4. That is, as shown in FIG. 8, the water level in the central part in the width direction of the pump water absorption tank 1 and the vicinity thereof is the highest, and both side walls 1 in the width direction are formed.
It takes a form in which the water level becomes lower as it shifts to the A, 1B side. Moreover, as the flow velocity of the water flowing down the pump water absorption tank 1 increases, the water level difference between the water level at the center in the width direction and the vicinity thereof and the water level on the side walls 1A and 1B in the width direction tends to increase. .

However, in a conventional water level measuring device for a pump water absorption tank, a vertical water-proof tube 2 is installed near one side wall 1A in the width direction of the water absorption water tank 1, and a water level gauge inserted into the water-proof tube 2 is installed. 3 is used to measure the local water level of the water absorption tank 1, so that the water level at the center in the width direction and the vicinity thereof is the highest, and as the water level shifts to the side walls 1A and 1B in the width direction. Water absorption tank 1 in which the water is reduced
The average water level cannot be measured, and a water level lower than the average water level will be measured. That is, although the water level in the water absorption tank 1 is not uniform in the width direction and a water level difference is generated, only the local water level of the portion where the breakwater pipe 2 is installed is measured. As a result, depending on the case, there is a possibility that a malfunction may occur in the drainage pumps P1, P2, P3, and P4.

[0005]

That is, in a conventional water level measuring device of a pump water absorbing tank configured to measure a local water level of a water absorbing tank, for example, a water level at a central portion in a width direction and a vicinity thereof. Is the highest, as the water level decreases as it moves to the width side walls,
If the water level is not uniform in the width direction of the water absorption tank and causes a water level difference, the average water level cannot be measured. Therefore, in some cases, there is a possibility that the drain pump may malfunction. Therefore, the invention according to claim 1 is to measure the average water level even if the water level of the pump suction tank is not uniform in the width direction and a water level difference occurs, thereby causing the malfunction of the drain pump due to the uncertainty of the water level measurement. It is an object of the present invention to provide a water level measuring device for a pump water absorption tank that can prevent the occurrence of water.

[0006]

According to a first aspect of the present invention, there is provided a water level measuring device for measuring a water level of a pump water absorption tank in which a drainage pump is installed. A perforated tube that extends and extends, and a wave-proof tube that is connected to an end of the perforated tube and extends vertically,
And a water level gauge installed in the wavebreak tube. According to the invention described in claim 1,
The perforated pipe draws water into the pipe corresponding to the water level in the entire width direction of the water absorption tank, and the drawn water is guided into the breakwater pipe. Thus, when the water level in the water absorption tank is uniform in the width direction of the water absorption tank, the water level in the breakwater pipe rises to the same level as the water level in the water absorption tank. On the other hand, when the water level in the water absorption tank is not uniform in the width direction of the water absorption tank and causes a water level difference, the water level in the breakwater pipe rises to the average level of the water level in the water absorption tank.
Therefore, this average water level can be measured by the water level gauge.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional plan view of a pump water absorption tank to which the present invention is applied, FIG. 2 is a cross-sectional view taken along line AA of FIG.
FIG. 2 is a sectional view taken along line BB of FIG. 1. The same or corresponding parts as those in the conventional example described with reference to FIGS. 6 to 8 are denoted by the same reference numerals. In FIGS. 1 to 3, for example, four water pumps P1, P2,
A perforated pipe 4 disposed on the bottom surface 5 extending over the entire width direction of the pump water-absorbing tank 1 in which P3 and P4 are installed, and one axial end of the perforated pipe 4, that is, one side wall 1A in the width direction of the pump water-absorbing tank 1.
Is provided with an up-and-down wave-proof pipe 2 which is connected to the vicinity of the water-absorbing pipe 2. The wave-break pipe 2 has a position of an open upper end 2A set higher than a highest water level HHWL expected in the pump water absorption tank 1. is there. A well-known water level gauge 3 of a float type, an ultrasonic type, a pressure type, or the like is installed in the wave preventing tube 2. If the upper end 2A is closed in a watertight manner with the water level gauge 3 inserted in the breakwater tube 2, the position of the upper end 2A is lower than the highest water level HHWL expected in the pump suction tank 1, and the normal highest It may be set higher than the water level HWL.

In the above construction, the perforated pipe 4 draws water into the pipe in accordance with the water level in the entire width direction of the pump water absorption tank 1, and the drawn water is guided into the breakwater pipe 2.
Thereby, when the water level of the pump water absorption tank 1 is uniform in the width direction of the water absorption tank 1 as shown by the imaginary line in FIG. 3, the water level in the breakwater pipe 2 is the same as the water level of the water absorption tank 1. It rises to the level shown by the virtual line, and this water level can be measured by the water level gauge 3.

On the other hand, as shown by the solid line in FIG. 3, the water level in the pump suction tank 1 is highest at the center in the width direction and in the vicinity thereof, and as the water level shifts to the side walls 1A and 1B in the width direction. Is low and the water level is not uniform in the width direction of the water absorption tank 1 and a water level difference occurs, the perforated pipe 4 supplies water into the pipe in accordance with the different water levels in the entire width direction of the pump water absorption tank 1. As a result, the drawn water is guided into the breakwater tube 2. Thereby, the water level in the breakwater pipe 2 rises to the average level of the water level in the water absorption tank 1 (the level indicated by the solid line). Therefore, the average water level can be measured by the water level meter 4.

As described above, even if the water level in the water absorption tank 1 is not uniform in the width direction and a water level difference occurs, the water level in the breakwater pipe 2 is measured by the water level meter 4 so that the water level in the water absorption tank 1 is measured. Since the average level can be known, it is possible to prevent malfunction of the drainage pumps P1, P2, P3, and P4 due to uncertainty in the water level measurement.

In the above-described embodiment, a description has been given of a configuration in which the perforated pipe 4 is disposed on the bottom surface 1A of the pump water absorption tank 1.
As shown in FIG. 4, the perforated pipe 4 may be provided in a widthwise groove 6 recessed in the bottom surface 5 of the pump water absorption tank 1. In addition, although the description has been made with the configuration in which the vertical breakwater pipe 2 is located near one side wall 1A in the width direction of the pump water absorption tank 1, the vertical direction is provided near the other side wall 1B in the width direction of the pump water absorption tank 1. The breakwater tube 2 may be located. Further, as shown in FIG. 5, a vertical groove 1a formed in one side wall 1A in the width direction of the pump water absorption tank 1 or a vertical groove (not shown) formed in the other side wall 1B in the width direction is vertically protected. The wave tube 2 may be located.

[0012]

As described above, according to the first aspect of the present invention, for example, the water level in the central portion in the width direction and the vicinity thereof is the highest, and the water level decreases as the water level shifts to both side walls in the width direction. In other words, when the water level is not uniform in the width direction of the water absorption tank and the water level varies, the average water level in the water absorption tank can be obtained by measuring the water level in the breakwater pipe with a water level meter. It is possible to prevent a malfunction of the drain pump due to measurement uncertainty.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

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

FIG. 4 is a sectional view showing another example of the embodiment of the present invention.

FIG. 5 is a cross-sectional plan view showing a different example of the embodiment of the present invention.

FIG. 6 is a cross-sectional plan view showing a conventional example.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view taken along line DD of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump absorption tank 2 Wave prevention pipe 2A Upper end of wave prevention pipe 3 Water level gauge 4 Perforated pipe P1 pump P2 pump P3 pump P4 pump

Claims (1)

(57) [Claims] 1. A water level measuring device for measuring a water level of a pump water absorption tank in which a drainage pump is installed, wherein the water absorption measuring tank is provided with a perforated pipe extending over the entire width direction of the water absorption tank and connected to an end of the perforated pipe. A water level measuring device for a pump water absorption tank, comprising: a wave pipe extending vertically in a vertical direction; and a water level meter inserted in the wave pipe.