JPH03183826A - Water lifter passing over bank by use of horizontal submerged water pump - Google Patents

Abstract

PURPOSE:To reduce construction cost and facilitate maintenance works, by arranging a horizontal submerged water pump, a vacuum pump, a priming water device like a make-up water tank or the like and by connecting a deaeration line for the priming water with the suction side of the submerged pump. CONSTITUTION:A horizontal submerged pump 6 is installed in a duct 3 laid on the ground near the water source like a river or others. And a vacuum pump 12, a make-up water tank 13, and a priming water devices like a vacuum water tank 15 are arranged in such a place where water flood is not caused. Further, a deaeration pipe line 20 for the priming water is connected to the suction side of the horizontal submerged motor pump 6. And the submerged water pump is installed on the ground to pump to water without excavating a bank. In this way, equipment investment can be reduced and maintenance and inspection work become easy.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention provides a horizontal submersible motor pump that is installed in a piping duct above the surface of the embankment close to the water source when pumping water using over-mountain piping along an embankment. This invention relates to an embankment lateral pumping device whose purpose is to strengthen the establishment of pump pumping and take in water using a vacuum pump and a bleed line from priming equipment such as a water replenishment tank and a vacuum drainage tank.

(Conventional technology) Conventional water intake methods include pumping up water by guiding it from the river intake underground through a sluice pipe to an intake well in the embankment, or by installing a submersible pump in a pump well under the riverbed. Lifting pipes are used to transport water to pump intake wells inside the levee by passing outside the levee ruler cross section. In either method, the gutter pipes are long due to current structural regulations, and the pump intake wells are also constructed 5 meters away from the seawall at a depth below the river bed, which poses many problems in terms of maintenance management and construction costs.

Another method of water intake is called the water intake tower method, in which a shed is built in a deep river to serve as both an intake well and a pump well, and a water pipe bridge is spanned from the embankment to facilitate management. This method is more expensive than the gutter pipe method because it requires sufficient rooting. Submersible motor pumps can be water-sealed, oil-sealed, or dry, depending on the type of motor, but in general, these are dry types, which require periodic lifting and various inspections, and are less durable than land-based pumps. is about 1/2. Nowadays, river managers want to minimize the use of sluice pipes for flood control purposes, and from the perspective of construction costs, it is a huge expense to construct specialized water intake bridges, sluice pipes, water intake wells, etc.
There is a need for water pumping equipment that does not cut into embankments and does not violate structural regulations.

(Problem to be solved by the invention) When taking water from a river and pumping it up, the River Management Facility Structure Ordinance requires that
It is possible to install a piping duct outside the standard cross section of the embankment and pass the piping across the embankment with a water volume of 0.5nf/see and a pipe diameter of 500.
If it is less than m, it is acceptable.

Additionally, in large rivers, a berm or high water bed is generally installed outside the bank. These are places that are low compared to the height of the embankment and are not normally submerged, but are only submerged during floods. A piping duct will be run horizontally from the water intake outside the cross section of the embankment ruler, and horizontal submersible motor pumps will be installed at the berms and high water beds. Even if the installation location is above ground, it will be submerged in water during a flood, so a submersible pump is required. Next, suction is required from the water intake to the submersible pump, and a priming device must be used to remove air from the pipes and fill them with water before starting up. On the discharge side of a submersible pump, the discharge head can be determined by selecting an impeller, similar to a normal pump. In large-scale river embankments, the interior of the embankment is often low, so it is important to save labor by using pipes that pass across the embankment and using sealed pipes in the areas that go over the mountains to form a siphon.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the embankment horizontal over-pumping device of the present invention installs a horizontal submersible motor pump in a piping duct on the ground near the water source, and this electric motor The pump will be either a passage cooling system or a water seal system, and the pump shaft seal will be an oil bath system with a double mechanical seal.

In addition, priming equipment consisting of a submersible motor pump for drainage, a vacuum drainage tank equipped with a water level detection sensor, a vacuum pump, and a supplementary water tank should be installed in a low place within the embankment, or a bleed pump with a built-in air-water separator and a supplementary water tank should be installed. A unitized continuous air bleed system with a water tank was installed, and a priming air bleed line was connected to the suction side leading to the center of the horizontal submersible motor pump impeller. A flow relay and a check valve with a non-water supply detector will be installed in the water pipeline. Furthermore, a tower-mounted pipe for taking out air is placed at the top of the Yamakoshi piping.

(Operation) The operation of the present invention will be explained below with reference to the drawings.
A surface water intake (2) will be opened below the water surface in the planned river bed (1). For the embankment, a piping duct (3) is constructed outside the ruler cross section, a lifting pipe (4) is laid, and a raised water bed (5) is constructed.
A horizontal submersible motor pump (6) is installed in the middle of the lift pipe (4) close to the water source side, and is connected and installed using a vibration-proof rubber mat (7) and a flexible expansion joint (8). A discharge tank (9) is installed on the ground lower than the top of the embankment within the embankment. The pumping pipe (4) from the water source to the discharge tank (9) has a chevron shape and is a sealed pipe forming a siphon.

A mounting tube (10) having a cavity is placed on the side wall of the curved tube section of the bone crest, and air bubbles in the flowing water are brought into the down pipe and discharged into the discharge tank (9). There is an operation room (11) inside the embankment, a vacuum pump (12), a water tank (13), and a vacuum drainage tank (15).
, install a submersible motor pump (18) for drainage. The bleed line (20) of the vacuum pump (12) is connected to the upper bleed bow 1-(16) on the suction side of the submersible motor pump (6), and this bleed line (20) is equipped with an electric ball valve (17) or a non-return valve. A valve shall be installed to prevent backflow when stopped.

When using a vacuum drainage tank (15), a small submersible motor pump (18) for drainage is installed in this tank to automatically drain water accumulated in the tank (15) using a water level detection sensor (19). The submersible motor pump (6) and vacuum pump (12) prevent water from coming into contact with the vacuum pump (12).
enables simultaneous operation of In order to automate the water pumping device, a non-water supply detector (21) is attached to the pumping pipe (4), and the vacuum pump (12) is started or stopped to enable simultaneous parallel operation with the submersible motor pump. Further, the electric ball valve (17) of the bleed air line (20) is linked with the vacuum pump (12) to achieve complete automation.

(Example) An example will be described below with reference to each drawing. Since this device is installed on an embankment, it is installed in a piping duct with the aim of minimizing the rotational vibration of the pump and the vibration caused by the pulsation of pumped water. For installation inside the embankment, use a vibration-proof stand or rubber mat (7), and use flexible expansion joints (8) at both ends of the suction and discharge sides of the lift pipe (4) to prevent vibrations from being applied to the embankment body. Take all possible precautions. FIG. 1 is a cross-sectional view of an embankment transverse pumping device in which a vacuum drainage tank (15) is used in the in-levee operation room (11). Figure 2 is a flow diagram of the auxiliary equipment, and the air extraction line (20) is connected to the vacuum drainage tank (15) from the air extraction port (16) of the horizontal submersible motor pump (6), and the water that comes as an air-water mixture is used as drainage water. Discharge with the middle pump (18),
Only air is removed with a vacuum pump (12). Also, in Figure 3, the installation of a vacuum drainage tank (15) in the operation room (11) inside the embankment is omitted, and the air-water mixture is directly sucked in by the extraction pump (14) built into the air-water separator to separate the air-water. This allows simultaneous operation of the horizontal submersible motor pump (6) and the bleed pump (14).

(Effects of the Invention) Since the present invention is configured as described above, it produces the effects as described below.

Because the water intake method uses a pumping pipe that crosses the embankment or outside the standard cross-section, the need for excavating the embankment, constructing intake gates, sluice pipes, and intake wells is reduced, and there is no problem with flood control or water control. Pumping water across the outside of the ruler cross section is recommended to avoid causing damage to the embankment.

In the case of a large-scale river, if the height from the planned river bed to the ground within the levee exceeds 6.0 m, the horizontal shaft volute pump must be installed with its surface lower than the ground.

Even if the pump room was placed close to the intake well, the suction head would be high, and due to automation, an auxiliary priming machine was also required. In terms of maintenance, labor was required to open the water intake door, remove dirt from the screen installed on the clean side, and remove dirt from the gutter pipes.

On the other hand, the conventional water intake method of constructing a pump well in the river bed and installing an ice motor pump had practical problems, as it required removal and temporary cofferdams for installation in terms of power supply and regular maintenance. On the other hand, this device does not require a storage structure such as a pump well, and the horizontal submersible motor pump is downsized and built into a pipeline, and is housed in a piping duct on a high water bed.
As with normal land pumps, maintenance is done on the ground.
Furthermore, durability can be improved compared to those that are constantly submerged in water. Furthermore, in terms of functionality, it can be installed close to the water source and can pump water with less vacuum and less priming operations.

In addition, since the submersible motor pump and the air bleed pump can be operated in parallel at the same time, during dry periods, 4 degrees of air is drawn in from the water intake, resulting in water intake, which bleeds air from the center of the impeller, eliminating air blockage. Pumping is established and automation is easy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a sectional view of a device in which a vacuum drainage tank is installed in the operation room inside the embankment, and FIG.
3 is a detailed diagram of the flow of the auxiliary equipment shown in the figure, and FIG. 3 is a sectional view of the device according to claim 3, which includes an air extraction pump and a water replenishment tank, with the vacuum drainage tank omitted, and which includes a steam/water separator, and FIG. 4. is the third
The detailed flow diagram of the auxiliary equipment shown in the figure, and FIG. 5 is a sectional view of a continuous extraction type horizontal submersible motor pump. Note that (D) in the figure is a discharge drain. l... Planned riverbed 2... Water intake 3... Piping duct 4... Lifting pipe 5... High water bed 6... Horizontal motor pump 7... Anti-vibration rubber mat 8... Expansion joint 9... Discharge tank 10. Onboard pipe operation room 12. Vacuum pump water supply tank 14. Bleed pump vacuum drain tank Bleed port 17. Electric pole valve submersible motor pump for draining Water level detection sensor Bleed line Check valve drain with no water supply detector

Claims (3)

[Claims] (1) Pump When taking water from a river, dam, or flooded area, a horizontal submersible motor pump is installed in an above-ground piping duct close to the water source, and a vacuum pump, water replenishment tank, and vacuum drainage tank are installed inside the embankment or in a place where there is no risk of flooding. An embankment lateral over-pumping device using a horizontal submersible motor pump, which comprises priming equipment such as the above, and a priming bleed line connected to the suction side of the horizontal submersible motor pump. (2) The water pumping device according to item 1, wherein air is removed from an air bleed port in the center of the pump impeller in order to perform perfect air bleed when a horizontal submersible motor pump and a vacuum pump are operated in parallel in conjunction with each other. (3) In the method for separating air and water from an air bleed line to a vacuum pump, the vacuum drainage tank is omitted, and a continuous air bleed device is provided as a unit consisting of an air bleed pump with a built-in air water separator and a water replenishment tank. pumping equipment.