JP2000009039A - Water level following submerged pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely adjust height of a submerged pump so as to prevent the submerged pump from being embedded in sedimentation deposit. SOLUTION: A submerged pump main body 11 is floatedly supported on a water level WS while a suction port 11b is sunk in the water by means of a metal can 12, for discharging supernatant water W. Since a suction hose 14 extended from a discharge port 11b of the submerged pump main body 11 has flexibility, this water level following submerged pump 1 is lowered while following up lowering the water level due to discharging accompanied with flexible deformation of the suction hose 14. When the metal can 12 is seated on sedimentary deposit D, the suction port 11b of the submerged pump main body 11 is located higher than the deposit D. The deposit is not discharged together with the water, accordingly. After the metal can 12 is seated at the deposit D and a draft line DL is lowered to a position of a float switch 13 or lower, the submerged pump main body 11 is stopped by the float switch 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump used for various drainage or pumping equipment, for example, drainage of supernatant water in a polluted water treatment facility.

[0002]

2. Description of the Related Art In a polluted water treatment facility, a submersible pump is used as a means for draining supernatant water in which pollutant particles such as soil particles are precipitated by storing the polluted water in a sedimentation tank. In the prior art, the submersible pump is suspended in a sedimentation tank in a state in which it can be moved up and down by, for example, a lever block, and is moved up and down in a timely manner so as to maintain a certain interval or more with respect to the sediment and the water surface level. ing.

The reason for suspending the submersible pump in a state in which it can be moved up and down in the sedimentation tank is as follows. First, when polluted water is supplied to the sedimentation tank, polluted particles such as earth and sand settle with the passage of time. As the sediment gradually accumulates at the bottom of the sedimentation tank, always keep the submersible pump away from the upper surface of the sediment by a certain distance or more so that the sediment does not discharge together with the water. This is because it is necessary to hold it so that it is in the position where it is located. Secondly, if the submersible pump is fixedly installed near the water surface level, only the supernatant water can be reliably discharged, but if the water surface level drops below the suction port of the submersible pump due to drainage, This is because drainage becomes impossible.

[0004]

In the above prior art, the height of the suspension of the submersible pump is adjusted by operating a lever block or the like each time while monitoring the state of sediment accumulation. However, depending on the state of contamination of the water stored in the sedimentation tank, it is difficult to confirm the height of the sediment, and therefore, the submersible pump is buried in the sediment and discharges the sediment with the water. At present, defects frequently occur. As a result, the discharged earth and sand may accumulate in a drainage facility outside the sedimentation tank and cause a functional failure. Therefore, it is necessary to remove the discharged and accumulated earth and sand by a vacuum suction means or the like. Various problems are pointed out.

[0005] The present invention has been made under the above circumstances, and the main technical problem is to prevent the submersible pump from being buried in sediment or the like. The purpose is to accurately adjust the height of the submersible pump.

[0006]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the water level tracking type submersible pump according to the present invention, the submersible pump body with a flexible suction hose connected to the discharge port, the submersible pump body on the water surface such that the suction port is located below the water surface It comprises a floating member for supporting the floating, and supporting legs for supporting the submersible pump body such that its suction port is located above the water bottom when the water level is lowered. As a more preferable configuration added in this case, the levitation member may also serve as a support leg, or as another more preferable configuration, the floating line between the draft line and the suction port in a floating state by the levitation member may be used. A draft sensor provided at an intermediate height, wherein the drive of the submersible pump main body is stopped when the height of the draft line is lower than the draft line in the floating state by a predetermined value or more. Is controlled.

[0007] According to the structure of the present invention, the submersible pump body is drained while being floated and supported on the water surface so that the suction port is positioned below the water surface by the floating member. There is no. In addition, since the suction hose has flexibility, the water level following type submersible pump follows the water level drop due to drainage and descends with the bending deformation of the suction hose. Then, when the support leg or the floating member serving also as the support leg is lowered until it is seated on the water bottom (sediment), in this state, the submersible pump body is supported such that the suction port is higher than the water bottom (sediment). Therefore, the sediment is not discharged together with the water.

Further, even after the submersible pump main body descends until the supporting leg or the floating member serving as the supporting leg is seated on the water bottom (sediment), the submersible pump is continuously drained by the submersible pump. The draft level of the main body is
The draft height in the floating state by the floating member gradually decreases. The draft sensor detects the draft height, that is, after the support leg or the floating member serving as the support leg is seated on the water bottom (sediment), the draft level is changed to the draft height in the floating state. At a point in time when the water pressure drops by a predetermined value or more, the drainage by the submersible pump main body can be stopped via the draft sensor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a preferred embodiment of a water level tracking type submersible pump according to the present invention, in which reference numeral 1 denotes a sedimentation tank in a polluted water treatment facility, and reference numeral 2 denotes water supply. A water supply pipe connected to a pump (not shown) for supplying contaminated water such as muddy water to the settling tank 1; reference numeral 3 denotes an upper limit of the level WL (water surface WS) of the contaminated water supplied to the settling tank 1. In other words, it is a water level sensor for controlling the amount of water supplied to the sedimentation tank 1, and comprises, for example, a float switch for stopping the water supply pump when the water level WL rises to its installation height.

As shown in a plan view (A) and a vertical sectional view (B) of FIG. 2, a water level tracking type submersible pump 10 according to this embodiment includes a submersible pump main body 11 and a submerged pump main body 11 settled in a settling tank. A plurality (five in the illustrated example) of metal cans 12 as a floating member that floats and supports the water surface WS within 1;
A float switch 13 fixed as a draft sensor is provided on one side of the metal can 12. A suction hose 14 made of a flexible material such as hard vinyl is connected to a discharge port 11 a opened at the upper end of the submersible pump body 11, and is led out of the sedimentation tank 1.

Each of the metal cans 12 is, for example, a cylindrical 20-liter can with a closed interior. The metal cans 12 are connected such that their lower end surfaces 12a are aligned with each other in a plane and surround the outer periphery of the submersible pump body 11. I have. Submersible pump body 11
Means that the suction port 11b provided at the lower end of the metal can 1
In a state where the suction port 11b is located at a position higher than the lower end surface 12a by a predetermined height h and is floated and supported on the water surface WS by the metal can 12, as shown in FIG. That is, it is in a state of being immersed in water. The height h takes into account a height at which the deposit D is not sucked up by the suction port 11b when the lower end surface 12a of the metal can 12 is seated on the deposit D as described later. Is set.

The motor 1 built in the submersible pump body 11
1c is connected to the power supply via the float switch 13. The float switch 13 turns on the circuit to the motor 11c by the buoyancy of a built-in float (not shown) when immersed in water, and the circuit is controlled by the weight of the float when the float is relatively higher than the water surface. Is turned off, and as shown in FIG. 1, the draft line DL in a state where the submersible pump 10 is floated and supported on the water surface WS.
And the suction port 11b of the submersible pump main body 11 and is fixed at a height.

In the above configuration, first, contaminated water such as muddy water is supplied into the settling tank 1 from a water supply pipe 2 by a water supply pump (not shown). When the level WL of the contaminated water supplied to the sedimentation tank 1 reaches the installation height of the water level sensor 3, the water level sensor 3 turns off the power supply to the water supply pump, whereby the water supply is stopped.

When the turbulent flow due to the water supply stops, the polluted particles such as earth and sand contained in the polluted water impregnated in the sedimentation tank 1 gradually settle with the passage of time due to the difference in specific gravity with water. Will accumulate at the bottom. Reference D indicates the deposit.

After a lapse of time required for separating the polluted particles (sediment D) and the supernatant water W due to the sedimentation, the water level following type submersible pump 10 according to the above embodiment is put into the sedimentation tank 1. Then, the submersible pump 10 floats on the water surface WS due to the buoyancy of the metal can 12, and in this state, the metal can 1
The float switch 13 attached to 2 is turned on because it is below the draft line DL of the submersible pump 10,
The submersible pump main body 11 starts driving. Since the suction port 11b of the submersible pump body 11 is submerged in the water, the supernatant water W in the sedimentation tank 1 is sucked from the suction port 11b, and is discharged from the discharge port 11a through the suction hose 14 via the suction hose 14. (Outside processing tank not shown).

With drainage by the submersible pump body 11,
The water level WL in the settling tank 1 gradually decreases, and the water surface WS
The submersible pump 10 floating in the tank descends in the sedimentation tank 1 following this water level drop. Since the suction hose 14 connected to the discharge port 11a of the submersible pump body 11 has flexibility, the submersible pump 10 is smoothly lowered by flexing the suction hose 14 flexibly.

The submersible pump 10 follows the lowering of the water level WL.
Descends, the lower end surface 12 of the metal can 12
a sits on the upper surface of the sediment D at the bottom of the water. FIG. 3 shows this seated state. The metal can 12 is provided with the submersible pump 1.
In a state where the lower end surface 12a of the metal can 12 is seated on the sediment D, the submersible pump main body 11 has a suction port 11b having a height h higher than the upper surface of the sediment D. It is supported to be on the upper side. For this reason, a predetermined space is interposed between the deposit D and the suction port 11b, and the suction and discharge of the accumulated pollutant particles are effectively prevented.

After the metal can 12 of the submersible pump 10 is seated on the sediment D, the submersible pump 10 does not follow the decrease in the water level WL due to drainage, so that the draft line DL
Decreases with the water level WL. When the draft line DL is lowered to a position lower than the height detected by the float switch 13 (the position indicated by the two-dot chain line in FIG. 3), the circuit to the motor 11c of the submersible pump main body 11 is opened. The driving of the main body 11 stops, and the drainage ends.

Since the float switch 13 is mounted at a position higher than the suction port 11b of the submersible pump body 11, the submersible pump body 11 is stopped before the water level WL drops to the same level as the suction port 11b. . For this reason, there is no possibility of the motor 11c being overheated due to air being sucked into the submersible pump main body 11.

The deposits D at the bottom of the settling tank 1 are removed through a discharge means (not shown) provided at the bottom.

The present invention is not limited to the illustrated embodiment. For example, as the floating member, other than the metal can 12 in the above-described embodiment, any material such as styrofoam or a floating ring can be used as long as it has a buoyancy necessary for floatingly supporting the submersible pump body 11 on the water surface WS. Also, the draft sensor is not limited to the float switch 13, and other sensors can be used as long as the circuit is turned ON / OFF according to the draft height.

In the above embodiment, the metal can 12 serving as a floating member also serves as a supporting leg. However, by providing a supporting leg separately from the floating member, the submersible pump main body 11 can be connected to its suction port. It is good also as a structure which supports 11b in the state which separated from the deposit D more than an appropriate height.

Further, the present invention provides a sedimentation tank 1 as shown in the illustrated example.
In addition to the above-mentioned drainage, it can be used for various drainage or pumping facilities. Also, by appropriately setting the height of the submersible pump body 11 with respect to the floating member such as the metal can 12, it is useful as a means for collecting oil floating on the water surface (for example, collecting crude oil flowing out to the sea surface). .

[0024]

According to the water level-following type submersible pump of the present invention, the submersible pump body drains while following the lowering of the water level while the suction port is supported by the water surface so that the suction port is located below the water surface. In addition, it is not necessary to adjust the height of the submersible pump each time while monitoring the sediment accumulation state. Also, even if the water level following type submersible pump descends following the water level drop due to drainage until it is seated on the sediment, the submersible pump body is supported so that its suction port is at a position higher than the sediment. Therefore, it is possible to reliably prevent a problem that the deposit is discharged together with water, and to achieve an excellent effect that an operation of removing the discharged deposit by a vacuum suction unit or the like becomes unnecessary. .

Also, after the submersible pump descends until it sits on the sediment, the submersible pump main body is stopped via the draft sensor before the water level drops to the height of the suction port of the submersible pump main body. It is possible to prevent the submersible pump main body from being damaged due to the inhalation of air.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a preferred embodiment of a water level tracking type submersible pump according to the present invention is used for draining supernatant water from a sedimentation layer.

FIG. 2 shows a schematic configuration of a water level tracking type submersible pump according to the embodiment, wherein (A) is a plan view and (B) is a vertical sectional view.

FIG. 3 is an explanatory diagram showing a state in which the water level tracking type submersible pump of the embodiment is seated on a sediment.

[Explanation of symbols]

 Reference Signs List 1 sedimentation tank 10 water level tracking type submersible pump 11 submersible pump main body 11b suction port 12 metal can (floating member) 13 float switch (draft sensor) 14 suction hose D sediment DL draft line W supernatant water WL water level

Claims (3)

[Claims] 1. A submersible pump body having a flexible suction hose connected to a discharge port, a floating member that floats and supports the submersible pump body on the water surface such that its suction port is located below the water surface, A water-following submersible pump, comprising: a support leg for supporting the submersible pump main body such that its suction port is positioned above the water bottom when the water level is lowered. 2. The submersible pump according to claim 1, wherein the floating member also serves as a supporting leg. 3. The apparatus according to claim 1, further comprising: a draft sensor provided at a height between a draft line and a suction port in a floating state of the floating member, wherein the submersible pump main body is driven by the floating pump body. A water level tracking type submersible pump characterized in that it is controlled so as to be stopped when the height of the draft line falls below a predetermined value from the draft line in the floating state.