JPH11226308A - Sand lifting equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To efficiently and stably reduce the amount of water required for sand lifting, particularly the amount of clean water, using an inexpensive vortex pump as a pump for sand lifting. To provide a sand lifting device capable of performing sand lifting. SOLUTION: A whirlpool pump 5 for raising sand, which is provided with a sandlifting device capable of ascending and descending in a sand collecting tank 3 formed in a sand basin 1; A sand separator 6 that separates the sand from the vortex pump 5 into the sand separator 6 to detect the sand concentration, and a sand concentration sensor 9 that detects the sand concentration. The lift control means 7 drives the vortex pump 5 up and down according to the sand concentration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sand lifting device,
In particular, the present invention relates to a sand-lifting device for lifting sand settled at the bottom of a pond in a sedimentation basin such as a sewage treatment plant and a water treatment plant.

[0002]

2. Description of the Related Art Conventionally, sewage treatment plants, water treatment plants, etc.
A sand basin is provided to remove the sand contained in the influent water, and the sand settled at the bottom of the sand basin is sand-lifted by a sand-lifting device. In this sand basin, for example, as shown in FIG. 10, a fine dust remover 2 is disposed on the inflow side 10 of the sand basin 1 to separate and remove coarse dust contained in the inflow water, and then passes through the fine dust remover 2. The settled sand is naturally settled to the bottom of the sand basin 1, and the sand is sprayed with high-pressure water from a plurality of stages of sand collecting nozzles 41, 42, 43 connected to a high-pressure pump 40, thereby forming the deepest portion of the sand basin 1. Sand collecting tank 3
High-pressure pump 40 transported to the sand collecting tank 3
A sand separator disposed above the sand basin 1 together with water, using the negative pressure generated by the upward high-pressure water jetted from the jet pump 4 connected to the sand collecting tank 3 together with the water. 6, the separated sand is separated into water and sand in the sand separator 6, and the sand is discharged to the hopper 13 through the sand transfer device 61 comprising a screw conveyor. Pump pit 1 with 12
It is configured to drain to 1. In this case,
The high-pressure pump 40 is connected to the water storage tank T, so that a required amount of water stored in the water storage tank T can be supplied from the high-pressure pump 40 to the sand collecting nozzles 41, 42, 43 and the jet pump 4 via valves. I have to.

[0003]

As described above, in the conventional sand basin 1, the sand that has naturally settled at the bottom of the sand basin 1 is supplied to a plurality of stages of sand collecting nozzles 4 connected to a high-pressure pump 40.
The high-pressure water is sprayed from 1, 42, 43 to transfer the sand to the sand collecting tank 3, and the sediment deposited in the sand collecting tank 3 is separated by the upward high-pressure water jetted from the jet pump 4 into the sand separator 6. So that a large amount of water is required for sand lifting, and the efficiency of the jet pump 4 is 10%.
In combination with the fact that the driving water is about twice as large as the amount of water sucked up by the jet pump 4, the sand pumping pipe 44 connected to the jet pump 4, the sand separator 6, the pump pit 11 It is necessary to increase the size of the drain pump 12 and the like disposed in the system, and there is a problem that the construction cost and maintenance cost of the equipment including the high-pressure pump 40, the power equipment, and the like increase. Further, the water supplied from the high-pressure pump 40 to the jet pump 4 has a problem that treated water from which dust is removed and clean water are required.

SUMMARY OF THE INVENTION In view of the problems of the conventional sand basin sand-lifting device, the present invention uses an inexpensive vortex pump as a sand-lifting pump to reduce the amount of water required for sand-lifting, especially clean water. An object of the present invention is to provide a sand lifting device capable of efficiently and stably performing sand lifting while reducing the amount of water.

[0005]

In order to achieve the above object, a sand lifting device according to the present invention is provided with a vortex pump for lifting sand, which is disposed so as to be able to ascend and descend in a sand collecting tank formed in a sand basin. A sand separator that separates the lifted sand sucked up by the vortex pump into sand and water, a sand concentration sensor disposed during the sand lifting process from the vortex pump to the sand separator, and a sand concentration sensor; Lifting and lowering control means for driving the vortex pump up and down in accordance with the sand concentration detected by the sand concentration sensor.

[0006] This sand lifting device can reduce the amount of water required for sand lifting, particularly the amount of clean water, by using an inexpensive vortex pump as the pump for sand lifting. Also, by providing lifting control means for driving the vortex pump up and down in accordance with the sand concentration detected by the sand concentration sensor that detects the sand concentration provided during the sand lifting process from the vortex pump to the sand separator. In addition, the vortex pump can be installed at an optimum height for sucking up the sediment deposited in the sand collecting tank.

In this case, the elevation control means is constituted by a winding drum driven in accordance with the sand concentration detected by the sand concentration sensor, and unwinds and winds the rope wound up by the winding drum. The vortex pump can be configured to be driven up and down.

[0008] This makes it possible to easily and reliably drive the vortex pump up and down.

Further, the elevation control means may be configured to intermittently drive the eddy pump up and down at predetermined time intervals. In this case, the “time interval” is determined according to the distance between the vortex pump and the sand concentration sensor.

Accordingly, even when the distance between the vortex pump and the sand concentration sensor is large, the vortex pump pumps up the sediment accumulated in the sand collecting tank according to the sand concentration detected by the sand concentration sensor. It can be stably installed at the optimal height position.

Further, a sand separator may be installed above the sand basin, and the separated water may be supplied to the sand basin as the water for the sand collecting nozzle.

[0012] This makes it possible to further reduce the amount of water required for sand lifting, especially the amount of clean water.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the sand lifting device of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a sand basin 1 to which the sand lifting device of the present invention is applied. In the sand basin 1, a fine dust remover 2 is disposed on the inflow side 10 of the sand basin 1, and after separating and removing coarse dust contained in the influent water, the sand passing through the fine dust remover 2 is removed from the bottom of the sand basin 1. The sedimentation tank 3 formed at the deepest part of the sand basin 1 by injecting the sediment from the sand collecting nozzles 41, 42, 43 of plural stages.
The sand separator is disposed above the sedimentation basin 1 together with water by the whirlpool pump 5 for lifting sand disposed in the sedimentation basin 3 and transported toward the sand basin 1. Sucked up to 6,
In the sand separator 6, the sucked-up sand is separated into sand and water, and the sand is discharged to the hopper 13 via the sand transfer machine 61.
On the other hand, the separated water is supplied to the sand collecting nozzles 41, 42, 43 via a pipe 14 provided with valves V1, V2, V3, V4, and a drain pump 12 is provided via a pipe 15 provided with a valve V5. Is drained to the pump pit 11 in which is disposed.

In this case, a plurality of sand collecting nozzles 4
The bottom of the sand basin 1 provided with 1, 42, and 43 is gradually inclined toward the sand collecting basin 3 so that the sand can be easily transferred to the sand basin 3 formed at the deepest part of the sand basin 1. To be formed.

The vortex pump 5 is provided so as to be able to move up and down in the sand collecting tank 3 and, for example, a pump connected to the vortex pump 5 during the sand lifting process from the vortex pump 5 to the sand separator 6. In accordance with the sand concentration detected by a sand concentration sensor 9 provided in the sand pipe 8 for detecting the sand concentration, the vortex pump 5 is driven up and down through the elevation control means 7 to move the vortex pump 5 to the sand collecting tank. 3 to be installed at the optimum height to suck up the deposited sand.

In the present embodiment, the vortex pump 5 is attached to the tip of a link 70 whose base end is swingably supported on the fixed side of the sand basin 1 as lifting control means 7 for driving the vortex pump 5 up and down. The cable 71 whose tip is locked on a part of the cable 70 is taken up by a winding drum 72, and the cable 71 is unwound and wound, so that the vortex pump 5
Is driven up and down. In this case, the lifting pipe 8 connecting the vortex pump 5 and the sand separator 6 is configured by a flexible pipe that bends following the swing of the link 70 and the elevation of the vortex pump 5.

The sand separator 6 is a sand separation tank 6 having a bottom surface inclined.
A sand conveyor 6 such as a screw conveyor along the inner bottom surface
1 and an overflow tank 62 is formed,
In the sand separating tank 60, the sucked-up sand is separated into sand and water. Then, the sand is discharged to the hopper 13 via the sand transporting machine 61 and is carried out by a truck or the like. On the other hand, the separated water is provided to the drain pump 12 by appropriately opening and closing the valves V1, V2, V3, V4, and V5 provided in the pipes 14, 15 via the overflow tank 62 and the pipes 14, 15. In addition to the pump pit 11, a part of the pump pit 11 is selectively supplied to the sand collecting nozzles 41, 42, 43 provided in a plurality of stages at the bottom of the sand basin 1 as sand collecting nozzle water. In this case, at the start of the operation of the sand lifting device, the separated water is supplied to the valves V1, V2,
The sand collecting nozzle 4 is connected via a pipe 14 provided with V3 and V4.
1, 42, 43 and used as water for the sand collecting nozzle,
At the end of operation, the valves V1 and V
2, V3 and V4 are closed and a pipe 15 is provided with a valve V5.
Via a pump pit 11 with a drain pump 12
By draining the sand, the sand basin 1 can be made dry (waterless state) at the end of the operation, if necessary. This makes it possible to further reduce the amount of water required for sand lifting, particularly the amount of clean water.

In this case, the sand separator 6 is installed in the sand basin 1 at a predetermined height H having a head which can use the separated water as water for the sand collecting nozzle. When the pressure of the separated water is insufficient, a high-pressure pump 17 is connected to the water storage tank 16 and a pipe 18 from the high-pressure pump 17 is connected to a sand collecting nozzle as in a modification of the present embodiment shown in FIG. 4
It is possible to increase the water pressure in the pipe 14 by connecting the pipe 14 to supply the separated water to the pipes 1, 42 and 43.
At this time, as shown in FIG. 8B, water is discharged from the pipe 18 in the same direction as the flow direction of the separated water flowing in the pipe 14, so that the flow velocity in the pipe 14 becomes higher. It is desirable. Thereby, the head of the separated water is supplemented, and the separated water can be used as the water for the sand collecting nozzle.

Next, a description will be given of a sand concentration sensor 9 for driving and controlling a lifting / lowering control means 7 for setting the vortex pump 5 at an optimum height for sucking up the sediment accumulated in the sand collecting tank 3. The sand concentration sensor 9 includes a vortex pump 5
In order to reduce the time lag between the sand concentration at the position and the sand concentration detected by the sand concentration sensor 9, the vortex pump 5
However, as described later, the influence of the time lag can be eliminated by intermittently driving the vortex pump 5 up and down at predetermined time intervals by the elevation control means 7 as described later.

Various methods and mechanisms can be adopted as the sand concentration sensor 9, and examples thereof will be described below. In the sand concentration sensor 9 shown in FIG. 4, the detection tube 81 is set in a floating state on a part of the sand tube 8 via insulating materials 81a, 81a so that a load is not transmitted from the sand tube 8 on both sides. A weight sensor 91 is attached to the detection tube 81. Then, as shown in FIG. 4B, the weight of the water containing sand flowing in the detection pipe 81 is measured by the weight sensor 91 to detect the sand concentration. More specifically, the specific gravity of the sand is about 2.6, and when the sand concentration becomes 10%, the weight of the water in the detection tube 81 becomes about 11.6% heavier than the water containing the sand. . Thus, the sand concentration can be detected by measuring the weight of the water in the detection tube 81.

The detection sensor 9 shown in FIG. 5 has a magnet 9M attached to the bent portion of the sand pipe 8, for example, a bar projecting from an L-shaped bent portion 82, and this magnet 9M is attached to the bar. It is composed of a vibration detector 92 disposed in the coil 9C. The vibration detector 92 measures the vibration of the sand pipe 8 caused by the water containing the sand flowing in the bent portion 82 of the sand pipe 8 as an exciting current to detect the sand concentration. .

The sand concentration sensor 9 shown in FIG.
As shown in FIG. 6 (A), a bent portion of the sand pipe 8
As shown in FIG. 6B, the outer periphery of the bent portion 82 formed in an L-shape or the outer periphery of the bent portion 82 formed in a U-shape is surrounded by a sound-insulating box 93 and surrounded by the sound-insulating box 93. A sound detector 94 such as a microphone is installed inside. In this case, the bent portion of the sand pipe 8 is desirably formed of a metal pipe member such as a steel pipe in order to increase the measurement accuracy of the sound detector 94. Then, as shown in FIGS. 6C and 6D, the sound detector 94 measures the magnitude and frequency of the collision sound generated by the water containing the sand flowing in the bent portion 82 of the sand pipe 8. Then, the sand concentration is detected in consideration of the frequency characteristics of the water containing sand and the water not containing sand.

The sand concentration sensor 9 shown in FIG.
Similar to the sand concentration sensor 9 shown in FIG. 6, a bent portion of the sand pipe 8, for example, an outer periphery of an L-shaped bent portion 82 is surrounded by a sound insulating box 93 as shown in FIG. A sound detector 94 such as a microphone is installed inside the sound-insulating box 93, and a value measured by a current meter 95 installed on the sand pipe 8 is added as a correction value. Things. And FIG.
As shown in (C) and (D), the sound detector 94 measures the loudness and frequency of the collision sound generated by the water containing sand flowing in the bent portion 82 of the sand pipe 8, and In addition to considering the frequency characteristics of the water containing water and the water not containing sand, the concentration of sand is detected by adding the value measured by the current meter 95 installed in the sand pipe 8 as a correction value.

FIG. 9 shows a second embodiment of a sand basin 1 to which the sand lifting device of the present invention is applied. Similar to the sand basin of the first embodiment, the sand basin 1 is provided with a fine dust remover 2 on the inflow side 10 of the sand basin 1 to separate and remove coarse dust contained in the influent water. 2 is allowed to settle naturally at the bottom of the sand basin 1, and the sand is sprayed from a plurality of stages of sand collecting nozzles 41, 42, 43 to form sand at the deepest part of the sand basin 1. The sediment accumulated in the sand collecting tank 3 was disposed above the sand setting tank 1 together with water by the whirlpool pump 5 for sand transported to the holding tank 3 and transferred to the sand collecting tank 3. It is sucked into the sand separator 6, and in the sand separator 6,
The sucked sand is separated into sand and water, and the sand is transferred to a sand transfer machine 6
1 to the hopper 13, while the separated water is drained to the pump pit 11 provided with the drain pump 12 via the pipe 15 provided with the valve V 5.

In the present embodiment, as a lifting / lowering control means 7 for driving the vortex pump 5 up and down, a lifting / lowering table 75 provided so as to be able to go up and down along a guide rail 74 which is vertically provided on the fixed side of the sand basin 1. The whirlpool pump 5 is attached to the whirlpool pump, and the rope 77 whose tip is locked to the lifting platform 75 is taken up by a winding drum 76, and the rope 77 is unwound and wound up. 5 is driven up and down. In this case, the sand pipe 8 connecting the vortex pump 5 and the sand separator 6 is connected to the winding drum 7 like the cord 77.
6 and unwinding and winding in accordance with the unwinding and winding of the cable 77.

The rest of the configuration of the present embodiment is the same as that of the sand basin of the first embodiment, including the sand concentration sensor 9.

Next, the sand-lifting process by the sand-lifting device of the present invention will be described with reference to the flowchart shown in FIG. This flowchart shows that the sand concentration sensor 9 is connected to the vortex pump 5
Shows a case where it is arranged in the vicinity of the position. When starting sand lifting of the sand basin 1, the vortex pump 5 stands by at a position above the sand collecting tank 3 (a standby position at the upper end) so as not to be buried in the sand flowing into the sand collecting tank 3. I am trying to do it. First, by driving the lifting / lowering control means 7, the vortex pump 5 is lowered from the position above the sedimentation tank 3 to the position of the supernatant water in the sand basin 1, and the vortex pump 5 is activated, and the sucked supernatant water is started. Is pumped up to the sand separator 6, and the separated water is supplied to the valves V1, V2, V
3, a sand collecting nozzle 41,
The sand is supplied to 42 and 43, and the sediment that has naturally settled at the bottom of the sand basin 1 is transferred to the sand collecting tank 3 and accumulated. Next, the vortex pump 5 is lowered into the sand collecting tank 3 by further driving the elevation control means 7. By the way, when the vortex pump 5 is started, the sand concentration sensor 9
The sand concentration of the water flowing through the sand pipe 8 is detected, whereby the position of the vortex pump 5 with respect to the surface position of the sediment accumulated in the sand basin 3 can be detected. And
According to the sand concentration detected by the sand concentration sensor 9,
By driving the lifting / lowering control means 7, the vortex pump 5 is set at an optimum height for sucking up the sediment accumulated in the sand collecting tank 3. More specifically, when the sand concentration detected by the sand concentration sensor 9 is higher than the set sand concentration (range), it is determined that the vortex pump 5 is buried in the sediment, and the vortex pump 5 is determined. 5 is increased, while if it is lower than the set sand concentration (range), it is determined that the vortex pump 5 has not reached the sedimentation, the vortex pump 5 is lowered, and the sand concentration becomes the set sand concentration. (range)
So that In this way, the sand is lifted, whereby the vortex pump 5 is sequentially lowered. When the vortex pump 5 reaches the lower end (bottom) of the sand collecting tank 3, the sand is completed and the elevation control means 7 is driven. To raise the vortex pump 5 to a position above the sand collecting tank 3 (standby position at the upper end).
The lifting control means 7 and the like are stopped.

Next, when the sand concentration sensor 9 is disposed at a position away from the vortex pump 5, the elevation control means 7
, The vortex pump 5 intermittently at a predetermined time interval.
Can be eliminated by driving up and down, the sand lifting process will be described with reference to a flowchart shown in FIG. When starting sand lifting of the sand basin 1, the vortex pump 5 stands by at a position above the sand collecting tank 3 (a standby position at the upper end) so as not to be buried in the sand flowing into the sand collecting tank 3. I am trying to do it. First, by driving the lifting / lowering control means 7, the vortex pump 5 is lowered from the position above the sedimentation tank 3 to the position of the supernatant water in the sand basin 1, and the vortex pump 5 is activated, and the sucked supernatant water is started. Is pumped up to the sand separator 6, and the separated water is supplied to the valves V1, V2, V3, V
4 through a pipe 14 in which the sand collecting nozzles 41, 42,
43, the sediment that has naturally settled at the bottom of the sand basin 1 is transferred to the sand collecting tank 3 and accumulated. Next, by further driving the elevation control means 7, the vortex pump 5
Is lowered into the sand collecting tank 3 for a predetermined time (or distance). By the way, when the vortex pump 5 is started, the sand concentration sensor 9 detects the sand concentration of the water flowing through the sand pipe 8. The position of the vortex pump 5 can be detected. By driving the elevation control means 7 in accordance with the sand concentration detected by the sand concentration sensor 9, the vortex pump 5 is moved to an optimum height position for sucking up the sediment accumulated in the sand collecting tank 3. Install it. More specifically, the sand concentration detected by the sand concentration sensor 9 is
If the concentration is higher than the set sand concentration (range), it is determined that the vortex pump 5 is buried in the sediment, and the vortex pump 5
Is raised for a certain period of time (or distance). On the other hand, when the concentration is lower than the set sand concentration (range), it is determined that the vortex pump 5 has not reached the sedimentation, ) Lower the sand concentration to the set sand concentration (range)
So that In this case, the sand concentration sensor 9
If it is arranged at a position distant from the vortex pump 5, since there is a time lag of the sand concentration at the position of the vortex pump 5 and the sand concentration detected by the sand concentration sensor 9, a waiting time of a certain time is set. In other words, the lifting and lowering control means 7 intermittently drives the vortex pump 5 up and down at predetermined time intervals to eliminate the influence of the time lag. In this way, the sand is lifted, whereby the vortex pump 5 is sequentially lowered. When the vortex pump 5 reaches the lower end (bottom) of the sand collecting tank 3, the sand is completed and the elevation control means 7 is driven. Then, the vortex pump 5 is raised to a position above the sand collecting tank 3 (a standby position at the upper end), and the vortex pump 5, the elevation control means 7, and the like are stopped.

[0030]

According to the sand-lifting device of the present invention, the amount of water required for sand-lifting, particularly the amount of clean water, can be reduced by using an inexpensive vortex pump as a pump for sand-lifting. Can be connected to the whirlpool pump,
There is no need to increase the size of the sand separator, the drain pump provided in the pump pit, and the like, and the construction and maintenance costs of equipment including a high-pressure pump and electric power equipment can be reduced. Also, by providing lifting control means for driving the vortex pump up and down in accordance with the sand concentration detected by the sand concentration sensor that detects the sand concentration provided during the sand lifting process from the vortex pump to the sand separator. In addition, the vortex pump can be installed at an optimum height for sucking up the sediment deposited in the sand collecting tank, whereby sand can be efficiently and stably carried out.

Further, the lifting control means is constituted by a winding drum driven in accordance with the sand concentration detected by the sand concentration sensor, and unwinds the rope wound on the winding drum.
By configuring the swirl pump to be driven up and down by winding, the up and down drive of the swirl pump is simplified, and
It can be done reliably.

Further, the lifting control means is configured to intermittently drive the vortex pump up and down at predetermined time intervals, so that even if the distance between the vortex pump and the sand concentration sensor is large, the sand is lifted. According to the sand concentration detected by the concentration sensor, the vortex pump can be stably installed at an optimum height for sucking up the sediment accumulated in the sand collecting tank.

Further, by installing a sand separator above the sand basin and supplying the separated water to the sand basin as the water for the sand collecting nozzle, the amount of water required for sand lifting, particularly, the clean water It is possible to further reduce the amount of water, which allows the sand pump, sand separator,
There is no need to increase the size of a drain pump or the like provided in the pump pit, and construction and maintenance costs of equipment including a high-pressure pump and electric power equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a sand basin to which the sand lifting device of the present invention is applied.

FIG. 2 is a flowchart of a sand lifting process by the sand lifting device of the present invention.

FIG. 3 is a flowchart of a sand lifting process by the sand lifting device of the present invention.

FIG. 4 is an explanatory diagram illustrating an example of a sand concentration sensor.

FIG. 5 is an explanatory diagram illustrating an example of a sand concentration sensor.

FIG. 6 is an explanatory view showing an example of a sand concentration sensor.

FIG. 7 is an explanatory view showing an example of a sand concentration sensor.

FIG. 8 is an explanatory view of a water accelerating device for a sand collecting nozzle.

FIG. 9 is an explanatory view showing a second embodiment of a sand basin to which the sand lifting device of the present invention is applied.

FIG. 10 is an explanatory diagram showing a sand basin provided with a conventional sand lifting device.

[Description of Signs] 1 sedimentation basin 14 piping 15 piping 16 water storage tank 17 pump 2 fine dust remover 3 sand collecting tank 41, 42, 43 sand collecting nozzle 5 vortex pump 6 sand separator 60 sand separation tank 61 sand transfer machine 62 Overflow tank 7 Elevation control means 8 Sand pipe 82 Bend 9 Sand concentration sensor V1, V2, V3, V4, V5 Valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Noboru Itani 3-11-1, Shimosakabe, Amagasaki City, Hyogo Prefecture Inside Hitachi Kiden Kogyo Co., Ltd. (72) Inventor Masaharu Naita 3-11-1, Shimosakabe, Amagasaki City, Hyogo Prefecture No.Hitachi Kiden Kogyo Co., Ltd.

Claims (4)

[Claims] 1. A vortex pump for raising sand disposed in a sedimentation tank formed in a sand basin so as to be able to ascend and descend, and a sand separator for separating the lifted sand sucked up by the vortex pump into sand and water. A sand concentration sensor for detecting the sand concentration provided during the sand lifting process from the vortex pump to the sand separator, and an elevating device for driving the vortex pump up and down according to the sand concentration detected by the sand concentration sensor. A sand lifting device comprising control means. 2. The lifting control means is constituted by a winding drum driven in accordance with the sand concentration detected by a sand concentration sensor, and the vortex pump is driven by unwinding and winding the cable wound on the winding drum. 2. The sand lifting device according to claim 1, wherein the sand is driven up and down. 3. The sand lifting device according to claim 1, wherein the elevation control means intermittently drives the eddy pump up and down at predetermined time intervals. 4. The sand lifting device according to claim 1, wherein a sand separator is installed above the sand basin, and the separated water is supplied to the sand basin as water for a sand collecting nozzle.