JP5479252B2 - Pressure water injection pump system - Google Patents

Description

  The present invention relates to a pressure water injection pump system, and in particular, in a sand basin such as a sewer pumping station and a treatment plant, utilizing the principle of siphon by watertightening the inside of a pipe line of the pressure water injection pump. The present invention relates to a pressure water injection pump system that enables use of a pressurized water pump with a low head and a small output, energy saving by reducing operation power, and efficient sanding.

Conventionally, in sewage treatment, since sewage sand and sewage flow into the sewage pumping station and treatment plant in large quantities, particularly during rain, etc., the sewage sand flowing in as a pre-process of sewage treatment should be removed by precipitation. Yes. There is a sand pumping system as a method of removing the sand settling in the sand basin.
The sanding system is not particularly limited. For example, a system using a pressure water jet pump is employed as shown in FIG.

The sand pumping system using the pressure water jet pump 1 is installed in the sand basin S and is supplied with high pressure water from the pressurized water pump 5, and the water surface above the sand basin S. The separation tank 2 (cyclone type separation device), which is disposed at the bottom and is always open at the lower end, is connected by a pumping pipe 3 for sanding and separated water separated in the separation tank A drain pipe 4 is provided to return to the sedimentation basin again.
For this reason, since the sand containing sludge is transported in a sealed pipe, there is no problem of bad odor, the installation space can be reduced, automatic operation is possible, and operation management is easy. have.

  By the way, as shown in FIG. 3, the conventional pressure water injection pump system has a separation tank 2 that separates the solid liquid from the sand basin surface (pumping surface) as the head of the pressure water injection pump 1. The so-called actual lifting head up to the upper end (the highest point) of the separated water drain pipe becomes higher, and the discharge port 21 of the separation tank 2 and the discharge port 42 at the tip of the drain pipe connected to the separation tank are always in the air. Since it is open, the pressurized water pump 5 that supplies the pressure water to the pressure water injection pump 1 requires a capacity higher than the head obtained by adding the actual head and the loss of the entire system, so the output is high at a high head. There is a problem that a pump is required, and therefore the running cost is high, which is contrary to the recent energy saving.

  In view of the problems of the above-described conventional pressure water injection pump system, the present invention uses the siphon principle to save energy by reducing operating power by using a pressurized water pump with a low head output and a small output. An object of the present invention is to provide a pressure water injection pump system.

In order to achieve the above object, a pressure water injection pump system according to the present invention includes a pressure water injection pump installed in a sand basin and configured to supply pressure water from a pressurized water pump, and a separation tank disposed above the water surface. in pressurized water injection pump system adapted to Agesuna connected by riser pipe and discharge pipe bets, the drain pipe water inside the entire pipe conduit is vertically provided from the separation tank so as to maintain the state of filled The lower end discharge port is always submerged in the vicinity of the suction port of the pressure water injection pump in the sand basin, and the return water discharged from the lower end discharge port is in the vicinity of the suction port of the pressure water injection pump. It is characterized by being constituted so that it may discharge toward .

  In this case, a valve for maintaining watertightness in the entire pipe line can be provided at the discharge port of the separation tank.

  Further, the pressurized water pump can be variably driven in accordance with the sanding operation state.

  Moreover, the variable drive of the pressurized water pump can be performed by switching between two pressurized water pumps, a high head and a low head.

  In addition, a precipitate separator can be disposed below the separation tank.

  According to the pressure water injection pump system of the present invention, a pressure water injection pump installed in a sand basin and configured to supply pressure water from a pressurized water pump, and a separation tank disposed above the water surface, In a pressure water injection pump system that is connected by a drain pipe and sanded, the lower end of the drain pipe from the separation tank is always submerged so that the entire pipe line is filled with water. By arranging and configuring, the siphon principle can be used, so during the pumping operation, it is sufficient to have a head that is more than the water level loss of the entire system, and it can be used with a pressurized water pump with a low head and a small output. Energy saving can be achieved by reducing power.

And the lower end discharge port of the drainage pipe connected to the separation tank is arranged near the suction port of the pressure water injection pump under the surface of the sand basin, so that the return pressure of the return water discharged from the lower end of the drainage pipe is set. In addition, it will excavate and disturb sediments such as sedimentation that settles at the bottom of the pond, eliminating the need for a pressure water injection nozzle that was previously provided near the suction port of the pressure water injection pump, simplifying the equipment, Water and power can be reduced.

  In addition, by installing a valve to maintain the water tightness in the entire pipe line at the discharge port of the separation tank, it is possible to maintain the water tightness in the entire pipe line during the pumping operation and discharge the sediment. This can be done simply by opening and closing.

  In addition, by variably driving the pressurized water pump in accordance with the sand pumping operation status, the same pressurized water pump can easily cope with the difference in the head and can make the energy-saving pumping operation possible. .

  In addition, the variable pressure pump can be driven by switching between two high and low pressure pumps so that a high pressure and high pressure pressurized water pump can be used during startup. By using a pressurized water pump with a low output at a low head, energy-saving pumping operation can be performed.

  In addition, by installing a sediment separator at a position below the separation tank, even if the sediment containing a large amount of water stored in the separation tank is difficult to handle and dispose of, it is necessary to drain the required water with the sediment separator. It is possible to automatically discharge to a storage facility such as a discharge hopper.

It is explanatory drawing which shows one Example of the pressure water injection type pump system of this invention. It is a section explanatory view of a separation tank. It is explanatory drawing which shows the conventional pressure water injection type pump system.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pressure water injection pump system of the present invention will be described with reference to the drawings.

1 to 2 show an embodiment of the pressure water injection pump system of the present invention.
This pressure water jet pump system is installed in a sand basin S such as a sewage treatment plant and so that the sediment settled in the pond is pumped by a pumping pipe, and pressure water from a pressurized water pump 5 is supplied. The pressure water jet pump 1 thus configured and the separation tank 2 (cyclonic separation device) disposed above the water surface of the sand basin S are connected by a pumping pipe 3.

And by arranging the discharge port 41 at the lower end of the drainage pipe 4 connected from the pumping pipe 3 via the separation tank 2 so as to be always submerged under the water surface in the sand basin, the piping of the system during operation, the equipment was watertight, lifting pipe 3, separation tank 2, since the water inside the pipe conduit consisting of drainage tube 4 can be kept filled with the state, can the principle of the siphon, in pumping operation of the entire system It is sufficient if there is a head higher than the water level loss, and the pressurized water pump 5 has an advantage that a pump with a low head and a small output is sufficient.
In addition, by providing the separation tank 2 at the connection between the pumping pipe 3 and the drainage pipe 4, solids in the pumped water, for example, sand from a settling basin, can be pumped and separated with low power. In this case, a plurality of pressure water injection pumps 1 are connected to one separation tank 2 via pumping pipes 3 and the discharge valves are arranged in the pumping pipes from the respective pressure water injection pumps. By switching and operating 6 in sequence, sanding in each pond can be performed sequentially and efficiently with a simple device.

  The pressure water injection pump 1 has a suction port 11 disposed so as to easily suck up sediment at the bottom of the pond, and is connected to a pumping pipe 3 at the upper end and supplies pressurized water for operating the pressure water injection pump. The pressurized water supply pipe 51 from 5 is preferably connected via an on-off valve 52.

  In the separation tank 2, as shown in FIGS. 1 to 2, the tip of the pumped water pipe 3 connected to the pressure water injection pump 1 is formed on the upper outer peripheral surface of the cylindrical separation tank 2 and the cross section of the separation tank is circular. So that the incoming water causes a swirling flow along the inner wall of the separation tank 2, and this cyclone effect makes it possible to efficiently separate solid and liquid using the gravity difference between the water and the sand in the pumped water. The lower part of the separation tank 2 has an inverted conical shape so that the separated sand can be easily discharged, and a valve 7 for maintaining the watertightness in the pumping pipe is disposed at the discharge port.

Further, the water separated by the cyclone effect in the separation tank is drained by the drain pipe 4 disposed at the upper part of the separation tank, and the discharge port 41 at the lower end of the drain pipe 4 is as shown in FIG. in, so as to submerged under the surface of the sand basin S, thereby utilizing the principle of siphon by the interior of the entire pipe line of pressure water injection pump 1 water is watertight and kept filled by the state Like that.
In addition, the discharge port 41 at the lower end of the drain pipe is disposed so as to be in the vicinity of the suction port 11 of the pressure water injection pump 1. As a result, sediment such as sedimentation that settles at the bottom of the pond is excavated and disturbed by the discharge pressure of the return water discharged from the lower end of the drain pipe, and the pressure water is close to the suction port of the conventional pressure water injection pump. An injection nozzle was provided, and the sediment at the bottom was excavated and pumped up while being disturbed, but this drilling and disturbance drilling nozzle became unnecessary, the device was simplified, and water and power were reduced. It is possible to sand efficiently.

  In addition, sediments such as sand that have been separated in the separation tank and accumulated at the bottom are concentrated at a high concentration, but still contain a large amount of water, and are difficult to handle and dispose of under high water content. Therefore, a precipitate separator 8 is provided for separating water from the precipitated solid. The sediment separator 8 is disposed at a position below the discharge end of the separation tank, and drains the sediment such as sand that has settled in the separation tank and discharges it.

The precipitate separator 8 is not particularly limited, but, for example, as shown in FIG. 1, the screw conveyor 82 is disposed in an inclined manner in the separation tank 81 for draining the solid while draining. The water separated in the separation tank 81 is drained by overflow from the upper part of the tank, and the sand that settles on the bottom of the tank is raked up by driving the screw conveyor 82, and the discharge hopper 9 installed below. To be discharged inside.
As a result, the pressure water injection pump system is pumped up for a certain period of time, and when a predetermined amount of solids separated in the separation tank 2 is stored, the pressure water injection pump 1 is stopped and the valve 7 at the bottom of the separation tank is opened. In order to discharge the sediment into the sediment separator, even sediment that contains a large amount of moisture and is difficult to dispose of is automatically discharged to a storage facility such as the discharge hopper 9 while draining as required. be able to.

Pressure water is supplied to the pressure water injection pump 1 by driving the pressurized water pump 5. In this case, until the water is filled in the pumping piping and equipment in the system at the start-up, the pressure water injection pump is supplied to the pressure water injection pump 1. A pressurized water pump for supplying pressure water requires a high head. However, when the inside of the pipeline is full, a lower head than the water level loss of the system is sufficient.
In the present invention, the principle of siphon can be used by filling the entire pipe line of the pressure water injection pump with water to make it watertight.
Therefore, when the water injection pump is started, the pressurized water pump is driven to supply a certain amount of pressurized water. During continuous operation where the pumping water in the pipe line is stable (during sand pumping operation), the water level loss of the entire system is exceeded. Since there is only a need for a head (low head) and the output of the pressurized water pump can be reduced, the output of the pressurized water pump can be made variable.
The output of the pressurized water pump is not particularly limited. For example, the pressurized water pump can be driven at a variable speed, or two high-lift pumps and low-lift pumps are provided as pressurized water pumps. Switching operation can be performed according to the driving situation.

Note that by making the pressurized water pump 5 drive at a variable speed, the same pressurized water pump can cope with the difference in the head, and an energy-saving pumping operation is possible.
In order to cope with the difference in the heads, although not shown in the figure, when two pressurized water pumps with a high head and a high output and a pressurized water pump with a low head and a small output are provided, the pressurized water pump with a high head and a high output is operated at startup. Then, stop after a certain period of time and start the pressurized water pump with low head and small output. As described above, during the steady pumping operation, an energy-saving pumping operation can be performed by using the pressurized water pump having a low head and a small output.

  As mentioned above, although the pressure water injection type pump system of the present invention was explained based on the example, the present invention is not limited to the composition described in the above-mentioned example, and the composition described in the example is suitably combined. The configuration can be changed as appropriate without departing from the spirit of the invention.

  The pressure water injection pump system of the present invention makes it possible to use a pressurized water pump with a low head and a small output by making the inside of a pipe line watertight and utilizing the principle of siphon. Therefore, it can be suitably used for the application of a pressure water jet pump system for sanding sand in a sand basin such as a sewage treatment plant.

DESCRIPTION OF SYMBOLS 1 Pressure water injection type pump 11 Suction port 2 Separation tank 3 Pumping pipe 4 Drain pipe 41 Discharge port 5 Pressurized water pump 6 Discharge valve 7 Valve 8 Sediment separator 9 Discharge hopper S Settling basin

Claims (5)

A pressure installed in a sand basin and connected to a pressure water injection pump that supplies pressure water from a pressurized water pump and a separation tank placed above the water surface with a pumping pipe and a drain pipe to raise sand. In a water-injection pump system, pressure water injection in a sand basin at a position where the lower end discharge port of the drain pipe suspended from the separation tank is always submerged so that the entire pipe line is filled with water. Pressure water injection type , characterized in that it is arranged near the suction port of the pump, and the return water discharged from the lower end discharge port is discharged toward the vicinity of the suction port of the pressure water injection pump Pump system.   The pressure water injection pump system according to claim 1, wherein a valve for maintaining watertightness in the entire pipe line is disposed at the discharge port of the separation tank. The pressurized water pump, according to claim 1 or a pressure water injection pump system 2, wherein it has to be variably driven in accordance with the Agesuna operating conditions. A variable drive of the pressurized water pump, pressurized water injection pump system according to claim 1 or 2, wherein it has to perform at the switching of the high-lift and low-lift two pressurized water pump. The lower position of the separation tank, according to claim 1, 2, 3, or 4 pressure water injection pump system wherein a is disposed precipitate separator.

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