JP2556363Y2 - Vertical submersible pump - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to a vertical submersible pump. [Prior art and its problems] Generally, a submersible pump has a minimum water level that can be drained from its installation surface. And the height of the strainer stand.

For example, when cleaning a water receiving tank or the like installed in a tower of a building, it is necessary to pump out water and temporarily empty the inside of the tank. However, with the conventional pump, the distance from the tank bottom to the suction port is long, which, combined with the flatness of the tank bottom of the receiving tank, makes it inconvenient to not pump up the remaining bottom water when the water level becomes low. There is.

There is also a low-water pump dedicated to lowering the opening of the water intake as much as possible.However, this pump cannot be used for normal drainage at high water levels, and is ultimately used for high water levels and for droughts. Therefore, the equipment cost is high because two pumps are required.

[Purpose of the Invention] The purpose of the present invention is to provide a vertical submersible pump that functions effectively for soaking up bottom water during so-called drought and that can be used for normal drainage. It is in.

[Structure of the invention] In the vertical submersible pump according to the invention, the bottom plate fixed to the back surface of the pump suction cover at a slight distance from the bottom surface is provided with:
A water hole facing the pump suction port is bored, and a narrow upper flow passage leading from the peripheral side to the pump suction port is formed on the upper surface of the bottom plate facing the pump suction cover, and the bottom plate facing the water bottom surface On the lower surface, a plurality of spacers are protruded radially low on both the upper and lower surfaces of the bottom plate so as to form a narrow gap-shaped lower flow passage from the peripheral side to the pump suction port, and the periphery of the suction cover and the bottom plate are formed. In the part, there is a mounting seat for detachably fixing the strainer stand, and when fixing the strainer stand, the distance from the water bottom to the bottom of the suction cover is expanded, and the water passage from the water hole to the pump suction port is on the water surface It is formed large on the top.

Embodiment In FIGS. 1 and 2 of the embodiment, reference numeral 1 denotes an impeller 2
, A pump suction cover that covers the lower surface of the pump vortex chamber 1, a pump suction port 4 formed in the center of the pump suction cover 3, and a pump 5 that fits with the pump suction port 4. The stirring blade is attached to the lower end of the shaft 6.

3 to 5, reference numeral 7 denotes a bottom plate obtained by applying a rubber coating 9 to a disc-shaped cored bar 8, and a pump suction port 4 is provided at the center.
A water passage hole 10 is formed in the peripheral portion, and insertion holes 12... 12 for mounting bolts 11. When the bottom plate 7 is fixed to the back surface of the pump suction cover 3 by the mounting bolts 11..., The bottom plate upper surface 7a facing the pump suction cover 3 has a narrow gap extending from the peripheral side thereof to the pump suction port 4. A plurality of spacers 14a... 14a are protruded low radially so that the upper flow passage 13a is formed. Also, when the pump is placed on the water bottom surface 15 as shown in FIG.
A plurality of spacers 14b... 14b are protruded radially low on the bottom plate lower surface 7b facing the water bottom surface 15 so as to form a narrow lower flow passage 13b from the peripheral side to the pump suction port 4. Let it happen.

In FIG. 2, reference numeral 16 denotes a strainer stand in which a large number of through holes 17 are formed in the peripheral wall. The strainer stand is attached and detached by mounting bolts 11 so as to surround the bottom side of the bottom plate 7 and be guided downward. The strainer stand 16
At the time of fixing, the distance from the water bottom surface 15 to the lower surface of the suction cover 3 is widened, and a water passage from the water passage holes 17 to the pump suction port 4 is formed large in the water bottom surface 15.

[Operation] In the state shown in FIG. 2 in which the strainer stand 16 is mounted, the pump is used as a normal drainage pump at a high water level. In this case, foreign substances mixed in the water are prevented from entering by the peripheral wall of the strainer stand 16. Since a water hole 10 facing the pump suction port 4 is formed at the center of the bottom plate 7, it is not necessary to remove the bottom plate 7 during normal drainage at a high water level.

In the state shown in FIG. 1 from which the strainer stand 16 is removed, the narrow water passages 13a and 13b communicating with the pump suction port 4 are provided.
However, it is opened at an extremely low position close to the water bottom surface 15, so that a suitable system for suctioning bottom water at the time of drought is established. Then, in the initial stage of pump startup, the air staying in the pump swirl chamber 1 is discharged through the upper flow passage 13a by the action of the stirring blade 5, and when the air release is completed, by the action of the impeller 2. Water is sucked from the upstream and downstream passages 13a and 13b. In this case, foreign substances mixed in the water are prevented from entering the pump vortex chamber 2 by the extremely narrow flow passages 13a and 13b which are divided into upper and lower portions of the bottom plate 7, and fine particles which do not hinder passage in the pump. Contaminants pass through the upstream and downstream passages 13a and 13b,
Sucked from.

[Effects of the Invention] According to the present invention, there is an advantage that normal drainage when the water level is high and suction of bottom water at the time of drought can be performed by one pump. In addition, the proper use of the bottom plate 7 does not require the removal of the bottom plate 7 and can be performed by a simple operation of mounting and dismounting the strainer stand 16, which is extremely convenient.

When the low water level is used with the strainer stand 16 removed, the narrow flow passages 13a, 13a,
Since 13b is opened at an extremely low position close to the water bottom surface 15, drainage at a low water level is completely performed without generating residual water. In addition, since the flow passages 13a and 13b have an extremely narrow shape that is divided into upper and lower portions, the flow passages 13a and 13b are also effective in preventing intrusion of impurities mixed in water. In addition, fine solids and slender fibrous materials that do not hinder passage through the pump are
Pump inlet 10 smoothly along radial spacers 14a, 14b
And do not stay in the flow passages 13a and 13b.

[Brief description of the drawings]

Fig. 1 is a vertical sectional side view of a main part of the present invention submersible pump for sucking bottom water at the time of drought. Fig. 2 is a drawing showing the present invention submersible pump for normal drainage at a high water level. FIG. 3 is a plan view of a bottom plate mounted on the submersible pump of the present invention, FIG. 4 is a bottom view of a bottom plate mounted on the submersible pump of the present invention, and FIG. It is a vertical side view of a bottom plate attached to the present invention type submersible pump. 3 ... Pump suction cover, 4 ... Pump suction port 7 ... Bottom plate, 7a ... Bottom plate upper surface, 7b ... Bottom plate lower surface, 10 ... Water hole,
13a: Upper flow passage, 13b Lower flow passage, 14a, 14b
Spacer 15 …… Bottom surface, 16 …… Strainer stand, 17
…… a water hole.

Claims (1)

(57) [Scope of request for utility model registration] A bottom plate (7) fixed with a slight gap from the back surface of a pump suction cover (3) is provided with a water passage hole (10) facing a pump suction port (4). On the bottom plate upper surface (7a) facing the suction cover (3), a narrow upper flow passage (13a) leading from the peripheral side to the pump suction port (4).
And a bottom plate (7) formed on the bottom plate lower surface (7b) facing the water bottom surface (15) so as to form a narrow lower flow passage (13b) leading from its peripheral side to the pump suction port (4). A plurality of spacers (14a, 14b) are protruded radially low on both upper and lower surfaces (7a, 7b), and a strainer stand (16) is provided around the suction cover (3) and the bottom plate (7). Has a mounting seat for detachably fixing the water, and when the strainer stand (16) is fixed, the distance from the water bottom surface (15) to the lower surface of the suction cover (3) is expanded, so that the water holes (17 ... 17)
A vertical submersible pump characterized in that a water passage reaching the pump suction port (4) is formed larger on the water bottom surface (15).