JP3929213B2 - Tubular pump equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tubular type pump facility, and particularly at the confluence of rivers flowing from the tributaries into the main river, the water level of the tributaries is usually higher than the water level of the main river, and flows into the main river from the tributaries under natural flow. Since the water level of the main river is higher than the water level of the tributary and does not flow down naturally, the present invention relates to a tubular pump facility used for draining water of the tributary into the main river with a pump facility.
[0002]
[Prior art]
The actual head, which is the difference between the suction water level and the discharge water level, is small, and axial pumps and diagonal flow pumps are used as pumps for draining large volumes of water. However, civil engineering and building costs can be reduced to reduce overall project costs. The use of tubular pumps has been done in the past.
Tubular pumps are installed by lowering the entire pump from the suction water level so that the pump casing including the impeller can be completely submerged, and the pump is started by filling the pump with water on the suction side.
If the pump cannot be installed deep enough to fill the pump at the suction water level, the pump is started after the pump is full using a vacuum pump.
[0003]
[Problems to be solved by the invention]
In the conventional technology, if it is attempted to fill the pump without using a vacuum pump, a large-flow tubular type pump facility with a large pump drainage volume and a large impeller diameter inevitably has a suction water depth. Deeply required, resulting in deeper pump installation levels, increasing civil engineering costs and increasing overall project costs.
In order to reduce the overall project cost, it is necessary to make the pump installation level shallow and to be able to fill the pump without using the vacuum pump.
The present invention has been made in view of the above circumstances, and provides a tubular pump facility that can reduce the cost of civil engineering by reducing the installation level of the pump and can fill the pump without using a vacuum pump. With the goal.
[0004]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides that the entire impeller or a part of the impeller is positioned higher than the water level of the suction water tank, and at least a part of the ceiling of the pump suction channel is positioned lower than the water level of the suction water tank. In the tubular type pump equipment having the part formed in the back, a backflow prevention device is installed between the pump and the suction water tank, and the pump is filled with water on the discharge side and started. is there.
[0005]
Conventionally, a backflow prevention device has been provided on the discharge side of the pump, and the inside of the pump has been filled with water on the suction side, but according to the present invention, by providing a backflow prevention device on the suction side of the pump, By filling the pump with water on the discharge side having a high water level, the installation level of the pump can be reduced.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a tubular pump facility according to the present invention will be described with reference to the drawings. 1 to 5, the same reference numerals indicate the same devices or parts.
FIG. 1 is a schematic sectional view showing a first embodiment of the tubular pump facility of the present invention. In FIG. 1, the code | symbol 1 is a discharge side water surface, the code | symbol 9 is the suction water surface in a suction water tank, and the code | symbol 10 is a pump casing. The tubular pump includes a tubular pump driving device 4, a guide vane 5, and an impeller 6 in a pump casing 10.
[0007]
In the present invention, a flap valve is installed as a backflow prevention device 8 at the lowest suction channel ceiling 7 where the ceiling of the suction channel is formed at a position lower than the water level of the suction water tank. By opening the discharge gate 3, the tubular pump driving device 4, the guide vane 5 and the impeller 6 in the tubular pump are filled with water on the discharge side.
[0008]
In the above-described configuration, when the discharge gate 3 provided in the discharge flow path of the pump is fully opened, the discharge-side water surface 1 is higher than the pump casing including the impeller 6, so that the water on the discharge side flows from the discharge flow path and becomes tubular. The tubular pump driving device 4, the guide vane 5 and the impeller 6 in the mold pump are filled with water.
When the pump is started, water given energy by the rotation of the impeller 6 is discharged through the guide vane 5. If a flap valve is used for the backflow prevention device 8, when water in the pump is discharged by the operation of the tubular pump, the water in the suction tank flows into the pump through the backflow prevention device 8 comprising the flap valve, and the pump The operation continues.
[0009]
FIG. 2 is a schematic sectional view showing a second embodiment of the tubular pump facility of the present invention. In the second embodiment, the tubular pump drive device 4, the guide vane 5, and the guide vane 5 in the tubular pump than the suction flow path ceiling lowest portion 7 in which the ceiling of the suction flow path is formed lower than the water level of the suction water tank. A backflow prevention device 8 is installed at a position close to the impeller 6. In the case of the second embodiment, the suction flow passage area is larger than in the case of the first embodiment shown in FIG. 1, and the flow loss resistance of the backflow prevention device can be reduced. In this case, air remains in the suction water tank side upper part of the backflow prevention device 8, but since the amount is small, there is no influence on the start-up and operation of the tubular pump.
[0010]
FIG. 3 is a schematic sectional view showing a third embodiment of the tubular pump facility of the present invention. In 3rd Embodiment, the backflow prevention apparatus 8 is installed in the position which approached the suction water tank rather than the suction flow path ceiling lowest part 7 in which the ceiling of the suction flow path is formed in the position lower than the water level of the suction water tank. Yes. In the case of the third embodiment, the suction flow passage area is larger than in the case of the second embodiment shown in FIG. 2, and the flow loss resistance of the backflow prevention device can be further reduced.
[0011]
FIG. 4 is a schematic sectional view showing a fourth embodiment of the tubular pump facility of the present invention. In the fourth embodiment, the installation position of the backflow prevention device 8 is a position closer to the suction water tank than the suction flow path ceiling lowest part 7 in which the ceiling of the suction flow path is formed at a position lower than the water level of the suction water tank. A gap S is provided between the backflow prevention device 8 and the ceiling. As a result, when the water on the discharge side flows back, the water flows over the backflow prevention device 8 and can flow back into the suction water tank, and the impact caused by the water hammer action generated in the backflow prevention device when the tubular pump is stopped is mitigated. be able to.
[0012]
FIG. 5 is a schematic sectional view showing a fifth embodiment of the tubular pump facility of the present invention. In the fifth embodiment, the backflow prevention device 8 is installed at the inlet of the suction flow path, and the upper side of the backflow prevention device 8 is opened to the suction water tank, and the effect is the fourth implementation shown in FIG. Although it is the same as that of the embodiment, since the backflow prevention device 8 is provided at the inlet of the suction flow path, the check and maintenance of the backflow prevention device 8 are easy.
[0013]
【The invention's effect】
As described above, according to the present invention, the tubular pump can be filled with water on the discharge side, so that the installation level of the tubular pump can be reduced, and civil engineering costs can be reduced. Further, since the vacuum pump is not used to fill the tubular pump, there are advantages that the equipment cost can be reduced and the filling time is short.
[Brief description of the drawings]
FIG. 1 is a sectional view of a pump facility according to a first embodiment of a tubular pump facility of the present invention, in which a backflow prevention device is disposed at the lowest position of a suction flow path ceiling.
FIG. 2 is a sectional view of a pump facility according to a second embodiment of the tubular pump facility of the present invention, in which a backflow prevention device is disposed between the lowest suction channel ceiling and the pump.
FIG. 3 shows a third embodiment of the tubular pump facility according to the present invention, and is a sectional view of the pump facility in which a backflow prevention device is arranged between the suction water tank and the suction channel ceiling lowest position.
FIG. 4 shows a fourth embodiment of a tubular pump facility according to the present invention, which is a sectional view of a pump facility in which a backflow prevention device capable of overflow is arranged between a suction water tank and a suction channel ceiling lowest position. is there.
FIG. 5 shows a fifth embodiment of the tubular pump facility according to the present invention, and is a sectional view of the pump facility in which a backflow preventing device capable of overflow is arranged at the inlet of the suction flow path.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Discharge side water surface 2 Discharge gate opening / closing machine 3 Discharge gate 4 Tubular pump drive device 5 Guide vane 6 Impeller 7 Suction flow path ceiling lowest part 8 Backflow prevention device 9 Suction water surface 10 Pump casing

Claims (6)

Tubular pump equipment having a portion where the entire impeller or part of the impeller is located higher than the water level of the suction water tank, and at least a part of the ceiling of the pump suction passage is formed lower than the water level of the suction water tank In
A tubular pump facility characterized by installing a backflow prevention device between the pump and the suction water tank and filling the pump with water on the discharge side. 2. The tubular pump facility according to claim 1, wherein the backflow prevention device is disposed at a location where the ceiling of the suction flow path is formed at a position lower than the water level of the suction water tank. 2. The tubular pump facility according to claim 1, wherein the backflow prevention device is disposed between a pump and a portion where the ceiling of the suction channel is formed at a position lower than the water level of the suction water tank. 2. The tubular pump facility according to claim 1, wherein the backflow prevention device is disposed between a portion where the ceiling of the suction channel is formed at a position lower than the water level of the suction water tank and the suction water tank. The backflow prevention device is disposed between the suction water tank and the portion where the ceiling of the suction flow path is formed at a position lower than the water level of the suction water tank, and the backflow prevention device is lower than the ceiling of the flow path and discharges. 2. The tubular pump facility according to claim 1, wherein when the water level on the side is high, the reverse flow can be made to flow back to the suction water tank beyond the backflow prevention device. The backflow prevention device is arranged at the inlet of the suction flow path from the suction water tank, and when the water level on the discharge side is high by opening the top of the backflow prevention device to the suction water tank, 2. The tubular pump facility according to claim 1, wherein a reverse flow is enabled in the suction water tank.

Images