JPH06108528A - Rain water drainage pump device and its operating method - Google Patents

Abstract

PURPOSE:To float deposited soil and discharge it to a delivery side where a grit chamber is located by providing a piping which is connected to the delivery side of a pump and suction side water channel and provided with a valve. CONSTITUTION:A pipe 2 and a valve 6 which bypass from a pipe to a pump suction side water channel at a place where soil is liable to be deposited are provided between a delivery side 5 and a pump 1. When the pump 1 is operated with a delivery valve 5 fully closed, the sucked water is increased in pressure to the maximum and, when the valve 6 is opened, the water flows from a pipe inlet 3 and is injected from an outlet 4 to the suction side. While soil is floated by the injection, the delivery valve 5 is opened and the valve 6 is closed to cause the pump 1 to suck soil together with rain water and discharge them to a grit chamber at the pump delivery side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater drainage pump device having a sand basin on the discharge side of the pump and a method of operating the same.

[0002]

2. Description of the Related Art In recent years, rainwater drainage pump devices that prevent flooding of rivers due to rainwater, especially in urban areas, have become difficult to secure a site due to the progress of urbanization and rising land prices. is there.

The rainwater drainage pump device is provided with a sand basin on either the suction side or the discharge side of the pump for settling and separating the sediment accompanied by rainwater.

FIG. 9 is a cross-sectional view of a rainwater drainage pump device of a pre-sedimentation basin type in which a sand basin is arranged on the suction side of a typical pump.

If the sand basin 10 is arranged on the suction side as shown in the figure, an enormous amount of excavation and civil engineering structures are required for that amount, resulting in an increase in construction cost.

FIG. 10 is a cross-sectional view of a rainwater drainage pump device of the post-sand set basin type in which a sand basin is arranged on the discharge side of a typical pump.

By arranging the sand basin 10 on the pump discharge side as shown in the figure, excavation of a portion surrounded by a dotted line and civil engineering and construction can be saved. It is thought that the main stream of future rainwater drainage pump equipment will be the post-sedimentation basin system in which the rainwater drainage pump in the deep underground drains to the above-ground sand basin.

[0008] After that, in the rainwater drainage pump device of the settling basin system, in order to settle and remove the sediment contained in the rainwater on the discharge side of the pump, the sediment exists in the suction side water channel and the sediment accumulates at a low flow velocity. However, when the accumulation amount is large, the loss on the suction side becomes large, and the discharge flow rate of the pump may decrease, or in some cases, the suction side of the pump may be clogged with earth and sand.

As described in Japanese Utility Model Laid-Open No. 63-60100, a technique for removing the sediment deposited in the pump suction side water passage is a communication for connecting the impeller inlet on the pump suction side and the pump suction side water passage. The connecting pipe 1 is provided by using the swirling flow generated by the rotation of the impeller during the shutoff operation of the pump.
To guide the water to the suction side and float the sediment deposited in the suction side water channel.

[0010]

In the swirling flow generated by the rotation of the impeller on the suction side during the shut-off operation of the pump as shown in the above-mentioned prior art, since the pressure is small, sufficient agitation cannot be performed and sufficient sand and sand cannot be obtained. I can not float.

An object of the present invention is to suspend and discharge the earth and sand accumulated in the suction side water passage of the pump in the rainwater drainage pump device of the post-sedimentation basin system.

[0012]

The above object is to provide a rainwater drainage pump device in which a sand basin is arranged on the discharge side of a pump for draining rainwater, and a communication valve is provided on the discharge side and suction side water passage of the pump. This is achieved by providing piping.

The above object is to provide a rainwater drainage pump device in which a sand basin is arranged on the discharge side of a pump for draining rainwater, and to install a pipe provided with a communication valve between the discharge side of the pump and the bottom surface of the inflow shaft on the suction side. It is achieved by providing.

In the rainwater drainage pump device in which a sand basin is arranged on the discharge side of a pump for draining rainwater, a pipe provided with a communication valve is provided between a cooling water outlet of a prime mover of the pump and a suction side water passage. Will be achieved.

The above-mentioned object is to operate a plurality of pumps by operating a plurality of pumps to drain rainwater to a sand basin, and to increase the number of pumps operated by increasing the water level in the suction side water passage of the pumps. Is achieved by sequentially bypassing the suction side water channel of the pump from the discharge side.

[0016] The above-mentioned object is to operate a rainwater drainage pump for draining rainwater to a sand basin by operating the pump, injecting water from a discharge side of the pump into a suction side water channel when performing a management operation of the pump. This is achieved by preventing the clay in the sediment deposited in the suction side water channel from sticking.

[0017]

According to the above structure, the valve of the pipe is opened from the discharge side, which has a higher pressure than the suction side, at the end of the operation when the amount of inflowing rainwater is reduced and the water level in the suction side water channel is lowered to stop the pump operation. It is possible to inject the water into the suction side water channel to float the accumulated sediment, suck up the sediment together with the water while the sediment is floating, and discharge it to the discharge side where the sand basin is located.

When one of the pipes is connected between the pump and the discharge valve, the discharge valve is fully closed at the end of operation and the pump is shut off to inject water at the highest pressure to the suction side, and a large amount is accumulated. If the sediment is suspended and the discharge valve is opened while the sediment is suspended, it can be discharged to the discharge side where the sand basin is located.

When one of the pipes is connected between the discharge valve of the pump and the sand basin, it is possible to open the valve in the pipe and inject water to the suction side without opening and closing the large-diameter discharge valve. it can. The operation becomes easy when the amount of sediment is small.

When one of the pipes is connected to the water channel on the downstream side of the sand basin, water with a small amount of earth and sand can be jetted to the suction side, and the pipe is not blocked or worn by the earth and sand.

When the other side of the pipe is connected to the bottom of the inflow shaft, the sediment deposited on the bottom of the inflow shaft can be removed.

When one of the pipes is connected to the cooling water outlet of the prime mover, the discharged cooling water can be effectively used.

When a plurality of pumps are operated, the suction side water channels of the pumps to be operated are sequentially bypassed from the discharge side so that the sediment deposited in the suction side water channels is suspended and the pumps are Sediment can be discharged to the discharge side immediately after operation

[0024].

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view for explaining an embodiment of the present invention.

Generally, when rainwater flows into a rainwater drainage pump device that does not have a sand basin on the suction side of the pump and the drainage operation is performed,
Sediment contained in rainwater accumulates in areas where the flow velocity drops sharply (approx. 0.8 m / Sec or less) such as landing wells, steps, and stagnation, and when the amount of sediment increases, loss on the pump suction side is planned. Since it increases over time, the drainage of the pump may decrease or the pump may be blocked.

Therefore, as in this embodiment, the bypass between the discharge valve 5 and the pump 1 is bypassed to a portion of the pump suction side water channel where sediment is likely to accumulate (a landing well, a step, a portion where stagnation occurs, etc.). By providing the piping 2 and the valve 6 for the operation, the sediment deposited on the suction side can be discharged to the discharge side as follows.

When the pump 1 is operated with the discharge valve 5 fully closed (a so-called shutoff operation), the suctioned water has the highest pressure, and when the valve 6 is opened, it is installed between the discharge valve 5 and the pump 1. It flows in from the pipe inlet 3 and is injected from the outlet 4 to the suction side via the pipe 2. Sediment floats due to the jet flow, and discharge valve 5
By opening the valve 6 and closing the valve 6, the pump 1 can suck the rainwater and the earth and sand and discharge it into the sand basin 10 on the pump discharge side. It is effective to perform such an operation before the drainage operation of the inflowing rainwater is finished, that is, immediately before the pump 1 is stopped, because the sediment accumulated during the drainage operation can be discharged. During normal drainage operation, the discharge valve 5 is fully open, but at the end of the drainage operation (when the inflowing rainwater is low and the suction side water level is low), the discharge valve 5 is temporarily closed to temporarily shut off or By carrying out the operation described above after putting the equipment into operation, it is possible to reliably discharge the sediment accumulated during the drainage operation to the discharge side, and the clay contained in the accumulated sediment will be retained until the next drainage operation. Since there is no fear of sticking due to being left for a period of time, the device can be made more reliable.

FIG. 2 is a sectional view for explaining a pipe injection section of another embodiment of the present invention.

FIG. 3 is a sectional view for explaining a pipe injection section of another embodiment of the present invention.

These drawings are installed so that the pipe outlet 4 in FIG. 1 can be jetted in parallel to the flow direction of water.
When the shutoff operation is performed in the same manner as above, since the water is jetted from the pipe outlet 4 in the flow direction, the sweeping effect is further added to the effect of floating the sediment accumulated on the bottom surface of the suction side water channel,
Sediment can be discharged more reliably than in FIG. 1.

FIG. 4 is a sectional view for explaining another embodiment of the present invention.

When the pump 1 is in normal drainage operation,
A pressure difference corresponding to the pump head occurs between the pump suction side and the discharge side. This example utilizes this pressure difference. By providing a pipe 2 that bypasses the discharge side pipe of the discharge valve 5 to a portion of the pump suction side waterway where sediment is likely to accumulate (such as a landing well, a step, or a portion where stagnation occurs), the suction side is set as follows. It is possible to discharge the sediment deposited on the discharge side. When the valve 6 is opened during the drainage operation of the pump, a part of the rainwater sucked up by the pump 1 is jetted from the pipe inlet 3 to the pump suction side water passage having a low pressure through the pipe inlet 3 and the pipe outlet 4. The jet flow makes it possible to suspend the sediment deposited in the pump suction side water channel, and thus the sediment deposited during the drainage operation can be discharged to the discharge side. In this operation, only the opening / closing operation of the valve 6 is performed, and the opening / closing operation of the discharge valve 5 having a large diameter is not required. Therefore, labor can be saved when the amount of sediment is small. FIG. 5 is a sectional view for explaining another embodiment of the present invention.

In the post-sedimentation basin system, a pipe 2 is provided for bypassing from the downstream channel of the sedimentation basin 10 to a portion of the pump suction side channel where sediment is likely to accumulate (such as a landing well, a step or a portion where stagnation occurs). Thus, the earth and sand accumulated on the suction side can be discharged to the discharge side as follows. By opening the valve 6 during the pump operation, a part of the rainwater sucked up by the pump 1 is jetted from the pipe inlet 3 to the pump suction side water passage having a low pressure through the pipe inlet 3 and the pipe outlet 4. The jet flow makes it possible to suspend the sediment deposited in the pump suction side water channel, and thus the sediment deposited during the drainage operation can be discharged to the discharge side. Further, in this case, since the pipe inlet 3 is provided on the downstream side of the sand basin 10, the bypassed water passes through the sand basin 10, so no sediment is mixed in, so there is no trouble in the bypass system due to sediment. It can be prevented. Further, by continuing this bypass operation, the suction side water passage can be purified.

FIG. 6 is a sectional view for explaining another embodiment of the present invention.

In this example, the drainage of the cooling water for cooling the prime mover 7 such as the motor for driving the pump 1 and the diesel engine is used, and the cooling water pipe 8 is a portion of the pump suction side water channel where sediment is likely to accumulate Water wells, steps, and areas where stagnation occurs). The cooling water drained when the prime mover 7 is driven passes through the cooling water pipe 8 and is jetted from the cooling water outlet 9. The jet flow can float the sediment deposited in the pump suction side water channel, so that the sediment deposited during the drainage operation can be reliably discharged to the discharge side. However, the structure differs between the prime mover that employs the direct cooling method and the secondary cooling method.

In the case of a direct cooling type prime mover, relatively good quality cooling water such as tap water is mainly used, and is temporarily supplied to a cooling water tank, sucked up from the water tank by a cooling water pump, passed through a cooler, There are water circulated to the cooling water tank and water drained through the cooler. This time, it is the latter drainage pipe that communicates with the pump suction side waterway.

In the case of the secondary cooling water system, the secondary cooling water is water discharged from source water such as river water, which is cooled by a fresh water cooler. Therefore, it is different in that the cooling water pipe is directly connected to the pump suction side water passage. This example makes effective use of the water resources that have been released.

FIG. 7 is an explanatory view for explaining another embodiment of the present invention.

As shown in the figure, it is assumed that three pumps are installed and the number of pumps is controlled by the water level of the water intake channel.
(In the figure, the pump type is different from that of FIG. 1.) First, when rainwater flows in and exceeds the water level of WL1, the first pump performs drainage operation and the second pump closes the discharge valve 5 to perform deadline operation. When the inflow of rainwater is large and the water level reaches WL2, the No. 1 pump continues the draining operation, the discharge valve 5 of the No. 2 pump is opened and the draining operation is switched to the deadline operation of the No. 3 pump. When the water level further rises and reaches WL3, the discharge valve 5 of the No. 3 pump is opened to switch to the drainage operation, and the deadline operation is switched to the drainage operation.

By doing so, the water channels on the suction side can be agitated before the No. 2 and No. 3 pumps shift to the drainage operation, and therefore the sediment deposited in the water channels on the suction side can be suspended. Therefore, it is possible to reliably discharge to the discharge side when switching to drainage operation. When the water level rises slowly and the operating time of the pump that is shut off exceeds the allowable value, the start time of the shutoff operation may be controlled while monitoring the rising speed of the water level. . Further, if the No. 1, No. 2, and No. 3 pumps are set to operate in rotation, it is possible to prevent sedimentation of the No. 1 pump suction side water channel, which is more effective.

Further, when performing pump management operation (the operation is performed at regular intervals for maintenance of the pump device, and there are many deadlines and bypass operations), the operation described in the above embodiment is performed and the pump is operated. Float and stir the sediment deposited in the suction side water channel. By this operation, it is possible to prevent the clay material contained in the sediment accumulated in the pump suction side water channel from sticking.

FIG. 8 is a sectional view for explaining another embodiment of the present invention.

As shown in the figure, also in the rainwater drainage pump device adopting the post-sedimentation basin system, sediment is deposited on the bottom of the inflow shaft where the flow velocity sharply decreases. Therefore, a pipe 2 that bypasses the pipe between the discharge valve 5 and the pump 1 is provided at the bottom of the inflow shaft. When the pump is operated with the discharge valve 5 fully closed (so-called shutoff operation), the suctioned water has a high pressure, and when the valve 6 is opened, the pipe installed between the discharge valve 5 and the pump body 1 Flowing in from the entrance 3,
It is injected from the outlet 4 to the bottom of the inflow shaft via the pipe 2. The jet flows into the inflow pipe 12 while the sediment deposited on the bottom of the inflow shaft floats. Eventually, the discharge valve 5 is opened and the valve 6 is closed, and this bypass operation is completed. It is effective to perform such an operation before ending the drainage operation, that is, immediately before stopping the pump, because the sediment accumulated during the drainage operation is discharged to the discharge side. By performing the operation of the above procedure at the end of drainage operation, the bottom surface of the inflow shaft is purified, and it is possible to prevent the clay residue remaining on the bottom surface of the inflow shaft that cannot be predicted when the next drainage operation will be performed due to heavy rain. The device can be made more reliable.

[0045]

EFFECTS OF THE INVENTION According to the present invention, by providing the pipe having the communication valve in the discharge side and the suction side water passage of the pump,
It is possible to inject from the discharge side with high pressure to the suction side water channel, to float the accumulated sediment, suck up the sediment together with water while the sediment is floating, and discharge / remove it to the discharge side with a sand basin.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a pipe injection unit according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a pipe injection unit according to another embodiment of the present invention.

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

FIG. 5 is a sectional view illustrating another embodiment of the present invention.

FIG. 6 is a sectional view illustrating another embodiment of the present invention.

FIG. 7 is an explanatory diagram illustrating another embodiment of the present invention.

FIG. 8 is a sectional view illustrating another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a rainwater drainage pump device of a pre-sedimentation basin system in which a sand basin is arranged on the suction side of a typical pump.

FIG. 10 is a cross-sectional view of a rainwater drainage pump device of a post-sedimentation basin type in which a sand basin is arranged on the discharge side of a typical pump.

[Explanation of symbols]

 1 Pump 2 Piping 3 Piping Inlet 4 Piping Outlet 5 Discharge Valve 6 Valve 7 Engine 8 Cooling Water Piping 9 Cooling Water Piping Outlet 10 Sandbank 11 Vertical Shaft 12 Inflow Pipe

Claims (9)

[Claims] 1. A rainwater drainage pump device in which a sand basin is arranged on the discharge side of a pump for draining rainwater, wherein a pipe provided with a communication valve is provided on the discharge side and the suction side water passage of the pump. Rainwater drainage pump device. 2. The rainwater drainage pump device according to claim 1, wherein one of the pipes is connected between the pump and the discharge valve. 3. The rainwater drainage pump device according to claim 1, wherein one of the pipes is connected between a discharge valve of the pump and the sand basin. 4. The rainwater drainage pump device according to claim 1, wherein one of the pipes is connected to a downstream side water channel of the sand basin. 5. In a rainwater drainage pump device in which a sand basin is arranged on the discharge side of a pump for draining rainwater, a pipe provided with a communication valve is provided on the discharge side of the pump and the bottom surface of the inflow shaft on the suction side. A rainwater drainage pump device characterized in that 6. The rainwater drainage pump device according to claim 5, wherein one of the pipes is connected between the pump and the discharge valve. 7. A rainwater drainage pump device in which a sand basin is arranged on the discharge side of a pump for draining rainwater, wherein a pipe provided with a communication valve is provided between a cooling water outlet of a prime mover of the pump and a suction side water passage. A rainwater drainage pump device characterized by. 8. In a method of operating a rainwater drainage pump for driving rainwater into a sand basin by operating a plurality of pumps, when the number of pumps to be operated is increased by increasing the water level in the suction side water passage of the pumps, the operation is planned. Method of operating a rainwater drainage pump, characterized by sequentially bypassing the discharge side of the suction side water passage of the pump. 9. A method of operating a rainwater drainage pump for operating a pump to drain rainwater to a sand basin, wherein water is injected from a discharge side of the pump into a suction side water channel when the pump is operated for management. A method for operating a rainwater drainage pump, characterized in that it prevents clogging of clay in the sediment accumulated in a side canal.