JP4503467B2 - Sanding system - Google Patents

Description

  The present invention relates to a pump-type sand pumping system, and in particular, it is cheaper and has a lower power than a conventional jet pump system, and is more resistant to burial than a conventional sand pump system and can be easily released from clogging. It is about the system.

Conventional pump-type sanding systems are roughly classified into two types: jet pump type and sand pump type.
Sand pump systems are broadly divided into submersible sand pumps that are installed underwater and land-type sand pumps that are installed on land. Conventionally, when sand in a settling basin is sanded, submersible sand pumps are often used. One unit is installed for each pond, or one submersible sand pump is moved by using a traveling device and an elevating device.
Moreover, when using an onshore sand pump, sand mixed water was once sucked to the ground with another vacuum pump, and the remaining head was conveyed by the onshore sand pump.

On the other hand, in principle, the jet pump has poor pumping efficiency, and when the sand is pumped from the sand basin to the solid-liquid separator, the power becomes very large.
In addition, the jet pump system has an excellent sanding function, but an expensive driving water pump is required. Further, since this driving water pump has a water quality higher than that of the secondary treated water in view of its performance, the secondary treatment A water supply pump, a driving water tank, and the like are separately required, which is expensive in terms of cost, and is assumed to be used in a place where secondary treatment water is easily secured.

  In view of the above-mentioned problems of the conventional sand pumping system, the present invention is cheaper and lower power than the conventional jet pump system, and more resistant to burial than the conventional sand pump system, and easy to release the blockage. Aims to provide a safe sanding system.

In order to achieve the above object, a sand pumping system of the present invention is a sand pumping system for pumping and transporting sand settling in a sand basin, comprising a suction pipe for sucking the sand, and supplying negative pressure by supplying high-pressure water to the suction pipe. A sand settling nozzle that generates pressure is installed in the sand settling basin, and the discharge side of the suction pipe is connected to the suction side of the land sand pump through an electric valve, and high pressure water is supplied from the sand collection water pump to the sand settling pressure sending nozzle. Supply the sand from the bottom of the pond to the ground with a sand-sink pumping nozzle, so that the rest of the head is pumped with an on-shore sand pump , and a plug release / backwash nozzle that supplies high-pressure water to the motor-operated valve is connected. In addition, by switching the motor-operated valve, the sand settling pit of the sand settling basin is backwashed and the consolidation of the onshore sand pump is released .

According to the sand pumping system of the present invention, several meters from the bottom of the pond to the ground can be pumped with a sand settling nozzle, and the rest of the head can be pumped with an onshore sand pump with high pumping efficiency. Compared with the system, the total power can be reduced.
In addition, since the sand settling nozzle has no working part in the pond and is resistant to burial and blockage with sand, it is easy to maintain and manage, and the sand settling nozzle is driven by an existing sand collecting water pump. By reducing the number of points and performing initial down, and using a conventional submersible sand pump as an onshore sand pump, it is possible to make one sand pump necessary for each pond.
In addition, when a large amount of sand is accumulated in the sand settling pit during sand pumping and sand or water cannot be sucked by the sand settling nozzle, the inside of the pit is backwashed by injecting high-pressure water from the release nozzle and backwash nozzle. In addition, when the discharge side of the onshore sand pump is compacted with high-concentration sand and blocked, the compaction can be released by injecting high-pressure water from the blocking / backwash nozzle.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sand raising system of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the sanding system of the present invention.
This sand pumping system pumps and transports the sand settling in the sand settling basin S, has a suction pipe 1 for sucking the sand, and supplies negative pressure by supplying high-pressure water to the suction pipe 1. 2 is installed in the sand settling basin S, the discharge side of the suction pipe 1 is connected to the suction side of the onshore sand pump 3, and a high pressure is applied to the sand settling pressure feed nozzle 2 from the sand collecting water pump 4 disposed in the pump well S1 and the like. Water is supplied.

Specifically, one onshore sand pump 3 is used for a plurality of settling basins S, sand is sucked from each settling basin S to the ground with a settling sand pressure nozzle 2, and sand mixed water is supplied to the onshore sand pump 3. While pumping up water, the onshore sand pump 3 lifts sand from the ground to the solid-liquid separator (not shown).
In the sand settling basin S, a sand collecting nozzle 5 that collects sand in the vicinity of the sand settling nozzle 2 and an excavation nozzle 6 that excavates the sand collected around the sand settling nozzle 2 are installed.
The sand collecting nozzle 5 is supplied with a low pressure and a large flow rate water, and the sand settling pressure feed nozzle 2 is supplied with a high pressure and a small flow rate water from a sand collection water pump 4.

The sand collecting water pump 4 is composed of a high head type underwater sewage filth pump or the like, and supplies driving water to the sand settling nozzle 2 via an automatic strainer 7 and also supplies water to the sand collecting nozzle 5 of the settling basin S. Also serves as a pump for.
In this case, since the pressure required for sanding of the sand settling nozzle 2 and the pressure required for the sand collecting nozzle 5 are different, the pressure is adjusted by a separately provided gate valve 8.
Further, when the land sand pump 3 is blocked by sand or dust, the sand collecting water pump 4 is installed so that the sand collecting water pump 4 forcibly feeds it backwashed or with jet water.

Next, the operation method of the sand raising system of the present embodiment will be described.
The sewage containing sand and dust flowing into the sand basin S is removed by a coarse screen or a fine screen (not shown) at the front stage of the sand lifting facility, and the sand is accumulated in the sand basin S.
After the end of rainfall (used in the rainwater-based sand basin in this embodiment), the residual water in the pond is drained by the sand-sediment pumping nozzle 2 and the land sand pump 3. The drained water is sent to a sewage system sand basin.
After draining the water in the pond, the sand basin S is dried, and only the sand is deposited.

In order to collect the sand accumulated in the sand basin S, the sand collecting water pump 4 installed in the pump well S1 and the like is driven, and the sand is collected to the pit S2 by the sand collecting nozzle 5 of the sand basin S.
Sand collection is performed for each set block, and sand collection and sand collection are alternately switched in the manner of sand collection after one block of sand collection and sand collection after the next block of sand collection.
After one block of sand collection, by switching the electric valve, the water from the sand collection water pump 4 is increased in pressure by the manual gate valve 8, supplied to the sand settling pressure feed nozzle 2, and sanded.

At this time, when a large amount of sand is stored in the sand settling pit S2 during sanding and sand or water cannot be sucked by the sand settling nozzle 2, the pressure gauge provided on the discharge side of the land sand pump 3 becomes zero.
This is detected as abnormally low pressure, and the motor-operated valve 9 provided on the suction side of the land sand pump 3 is switched to the closed state, so that the inside of the pit S2 is backwashed from the closure release / backwash nozzle 10. In this case, backwash water is supplied from the sand collecting water pump 4.
On the contrary, when the discharge side of the land sand pump 3 is consolidated with high-concentration sand and closed, the pressure gauge rises to the cutoff pressure.
This is detected as an abnormally high pressure, the motor-operated valve 9 is switched to open, and the compaction is released by injecting high-pressure water from the blocking release / backwash nozzle 10.
This can be counted a certain number of times, and when it reaches the specified number of times, it can be regarded as a failure and displayed on the operation panel or the central control room. If it is within a certain count, it returns and the counter returns to zero.

As described above, the sand pumping system according to the present embodiment has the same low cost and low power as the conventional sand pump system, and the excellent sand pumping function of the jet pump system, that is, burial and garbage. It can have both strength against blockage and releasability when closed.
The conventional jet pump system has an excellent sanding function, but an expensive drive water pump is required, and furthermore, this drive water pump has a water quality higher than that of the secondary treatment water in view of its performance. A water supply pump, a driving water tank, and the like are separately required, which is expensive in terms of cost, and is assumed to be used in a place where secondary treatment water is easily secured.

In addition, when compared with the conventional sand pump system, the sand pumping system replaces the conventional submersible sand pump with the land sand pump 3, so that the sand pumps required for each sedimentation basin S can be used in all ponds. One is enough.
As a result, the number of devices can be reduced, the initial down can be achieved, and the operating part in the sand settling basin S can be eliminated to simplify the maintenance.

In this embodiment, the sand collecting water pump 4 is a high head pump, and after one block of sand collecting, the valves are switched to drive the sand settling nozzle 2 and the land sand pump 3. The sedimentation pressure feeding nozzle 2 secures a predetermined pressure by the valve opening of the gate valve 8.
On the other hand, at the time of closing, the motor-operated valve 9 is switched to drive the closing / backwash nozzle 10.
The operation method is batch operation of sand collection and pumping sand, and the operation time is shortened by increasing the sand content rate.
In addition to improving the anti-blocking performance by the indentation by the sand settling pressure-feed nozzle 2, the pressure-feed nozzle, which is the same as the jet pump in principle, aims to increase efficiency and eliminates air-fuel mixture.

Thus, the sand pumping system of the present embodiment includes the suction pipe 1 for sucking the sand sink in the sand pumping system for sanding and transporting the sand settling in the sand settling basin S, and supplying the high pressure water to the suction pipe 1 causes negative pressure. Is installed in the sand basin S, the discharge side of the suction pipe 1 is connected to the suction side of the onshore sand pump 3, and the sand collecting water pump 4 disposed in the pump well S1 or the like Since high-pressure water is supplied to the sand settling pump 2, several meters from the bottom of the pond to the ground can be pumped by the sand settling nozzle 2, and the remaining head can be pumped by the land pump 3 with high pumping efficiency. Compared with the conventional jet pump system, the total power can be reduced.
In addition, the sand settling nozzle 2 has no working part in the pond, and is easy to maintain because it is resistant to burial and blockage with sand. Furthermore, the sand settling nozzle 2 is driven by an existing sand collecting water pump 4. Thus, the number of equipment is reduced and the initial down is performed, and the conventional sand pump 3 is used as the onshore sand pump 3, so that the sand pump required for each pond can be set to one in all ponds.

  As mentioned above, although the sanding system of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, The structure is suitably changed in the range which does not deviate from the meaning. can do.

  The sand raising system of the present invention has the characteristics that it is cheaper and has lower power than the conventional jet pump system, and is more resistant to burial than the conventional sand pump system and is easy to release the blockage. Therefore, it can be suitably used for, for example, a sand pumping system of a sand basin including a sewage treatment plant.

1 shows an embodiment of a sand raising system according to the present invention, in which (a) is an overall view thereof, (b) is an enlarged view of an onshore sand pump, and (c) is an enlarged view of a sand settling nozzle.

DESCRIPTION OF SYMBOLS 1 Suction pipe 2 Sand pressure pumping nozzle 3 Land sand pump 4 Sand collection water pump 5 Sand collection nozzle 6 Excavation nozzle 7 Automatic strainer 8 Gate valve 9 Motor-operated valve 10 Unblocking and backwash nozzle

Claims (1)

In the sand pumping system that sands and conveys the sand settling in the sand settling basin, a suction pipe for sucking the sand set up is installed, and a sand settling nozzle that generates negative pressure by supplying high-pressure water to the suction pipe is installed in the sand settling basin. The discharge side of the suction pipe is connected to the suction side of an onshore sand pump through a motorized valve, and high pressure water is supplied from the sand collection water pump to the sedimentation pressure feeding nozzle, and sand is pumped from the pond bottom to the ground by the sandfall pressure feeding nozzle. The sand lift pit of the sand settling basin is constructed by pumping the rest of the head with an onshore sand pump and connecting the motor-operated valve with a deblocking / backwash nozzle that supplies high-pressure water. A sand pumping system characterized in that the backwashing of the water and the consolidation release of the onshore sand pump are performed .

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