JPH0736151Y2 - Water tank pumping equipment - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is a water storage tank of a unit panel assembly type, which is a storage tank for pumping water in a tank by a rod-shaped submersible pump installed horizontally at the bottom of the tank. Regarding pumping equipment.

<Prior Art> The present applicant concentrically surrounds at least the suction port of a rod-shaped submersible pump having a suction port in the middle of its length with a tubular housing having an inner diameter slightly larger than the outer diameter of the pump, Place the pump and the cylindrical housing on the bottom of the water tank,
Actually, the water is pumped from the discharge port of the rod-shaped submersible pump through the lower end of the peripheral wall of the water storage tank to the outside of the water storage tank.
No. 105791, No. 166192, No. 62-57798, No. 61988.

<Problems to be solved by the invention> In a normal water storage tank, the pumping volume of the pump is larger than the inflow volume of makeup water into the tank. Therefore, the amount of water used outside is temporarily high, and when the pump is continuously operated, the water level in the tank gradually decreases, and finally the water swirls and is sucked into the pump, Sucks in air, and in the case of a submersible pump, the water is not sufficiently cooled and the pump fails. Therefore, when the water level in the tank drops to a certain level (safety lower limit water level), the pump operation is automatically interrupted, and the operation is restarted after waiting for the water level to recover.

For example, in two tanks with the same amount of water, A and B,
If the safe lower limit water level is lower than that of the second party, the tank of the first party has a larger pumping volume, and in order to make the second party's pumping amount the same as that of the second party, it is necessary to increase the capacity of the second party tank. That is,
There is a close relationship between the safety lower limit water level of the water storage tank and the tank capacity or installation space. The lower the safety lower limit water level, the smaller the tank capacity or installation space.

Although the safety lower limit water level could be lowered considerably by the above-mentioned conventional example, the present invention was developed to further lower the safe water level.

<Means for Solving the Problems> Therefore, the present invention provides a rod-shaped submersible pump having a suction port on the circumferential side, and a cylindrical housing surrounding the suction port placed horizontally on the bottom of a water storage tank. In a pumping device for a unit panel assembly type storage tank that pumps water in a storage tank through a lower part of a peripheral wall of the tank by means of a unit of the above-mentioned unit plate at the bottom of the tank configured by tightening a downward flange of a rectangular unit plate for the bottom plate. One piece is turned upside down, and the flange facing upward is tightened with the downward flange of the adjacent unit plate to form a recess in a part of the bottom, and the lower end of the cylindrical housing approaches the recess or the recess. It is characterized in that a suction pipe is provided that rushes into the interior of the.

<Embodiment> In each of the illustrated embodiments, P is a square unit plate for the bottom plate, f is its brim, and P'is a unit plate that is turned upside down to become the recess 7.
f'is an upward facing collar, B is a tightening bolt, N is its nut, 1 is a rod-shaped submersible pump, 2 is a suction port provided on the circumferential side in the middle of its length, and 3 is its front end. A discharge pipe 4 connected in an extended manner to a cylindrical housing 5 concentrically surrounding at least a peripheral side portion having a suction port of the submersible pump.
Is a water storage tank, 6 is a bottom thereof, 7 is a recess provided in a part of the bottom, 8 is a suction pipe which is connected to a tubular housing and has a lower end portion protruding into the recess 7 from above, 9 is the submersible pump, A pedestal for detachably embracing the tubular housing and laying it horizontally on the bottom 6 of the water storage tank is shown.

In the embodiment shown in FIG. 1, when performing maintenance or inspection of the submersible pump,
The pump is adapted to be pulled out from the peripheral wall 10 of the tank, and an opening 11 slightly larger than the outer diameter of the submersible pump is formed at the lower end of the peripheral wall 10.

The cylindrical housing 4 has an inner diameter approximately equal to that of the opening 11 and has a flange 4'at its front end. The flange 4'is applied to the inner surface of the edge of the opening 11, and the bolt 12 is attached from the inside of the tank to the flange and the edge of the opening. It is attached with a nut 12a screwed into the above bolt from the outside of the tank.

The discharge pipe 3 of the submersible pump is provided with a collar 3'having substantially the same size as the collar 4'of the tubular housing in the middle. The collar 3'has approximately the same thickness as the nut 12a, and has a hole 13 in the peripheral portion for fitting the nut 12a. The hole 12 is fitted in the nut 12a and is brought into contact with the outer surface of the edge of the opening 11. The washer 14 is fitted to the tip of each bolt 12 protruding from the nut 12a to close the hole 13, and then the nut 12b is screwed and tightened to be fixed. Therefore, when maintaining or inspecting the submersible pump, after emptying the water in the tank, the nut 12b is removed to remove the collar 3'of the discharge pipe from the peripheral wall, and in the middle of the pumping pipe 15 connected to the discharge pipe 3. Disconnect the flange connection portion 15 ', and leave the tubular housing 4 attached to pull out the submersible pump from the opening 11. After the inspection, the above operation is reversed and the submersible pump is housed in the cylindrical housing.

At the rear end of the submersible pump, there are about two diagonally downward protrusions,
Alternatively, a ring 16 with multiple protrusions distributed in the circumferential direction
To secure the submersible pump in a tubular housing in a substantially horizontal position and to keep a cylindrical gap between the outer circumference of the submersible pump and the inner circumference of the tubular housing.

The length of the cylindrical housing 4 is slightly longer than the length from the collar 3'of the discharge pipe of the submersible pump to the rear end of the pump, and its rear end is supported by the pedestal 9 on the bottom of the tank so that it is almost horizontal. is there. An inverted L-shaped suction pipe 8 is connected to the rear end of the cylindrical housing 4, and the lower end of the suction pipe is projected into the recess 7 in the bottom of the tank.

Therefore, at the time of pumping water, the submersible pump uses the suction pipe 8 to make the depression 7
Since the water is sucked up from the inside, the safe lower limit water level is lowered to almost the upper surface of the cylindrical casing 4, and the pumped-up amount becomes large.
A drain 17 is attached to the bottom of the depression, and the residual water remaining in the tank is drained by opening the drain 17 during maintenance and inspection of the submersible pump or cleaning of the tank.

In the embodiment shown in FIGS. 3 and 4, the submersible pump is brought out from the manhole on the upper wall of the water storage tank for maintenance and inspection. The pumping pipe 15 is located at the lower end of the peripheral wall 10 of the tank. Is pierced into the tank horizontally in a watertight manner and is detachably connected to the flange 3a at the front end of the discharge pipe 3 of the submersible pump by the flange 15a at the protruding end. Therefore, in order to take the submersible pump out of the manhole, the flanges 15a and 3a are disconnected.

In the embodiment shown in FIG. 3, the tubular housing 4 has a length that wraps from the front of the suction port 2 of the submersible pump to the rear end thereof, and the front end thereof is in contact with the outer periphery of the front of the suction port 2. And
The cylindrical housing 4 is supported substantially horizontally on the bottom 6 of the tank by the pedestal 9 at the front and rear, and the front end of the discharge pipe is connected to the pumping pipe 15. The submersible pump 1 is fitted with a similar ring 16 at the rear end. It is also supported almost horizontally in a tubular housing.

In this embodiment, the tubular housing 4 has a rear end portion to which a downward suction pipe 8 whose lower end is close to the upper surface of the recess 7 is connected. Therefore, in this embodiment as well, the safe lower limit water level is near the upper surface of the cylindrical housing 4, and the amount of pumped water is large.

In this embodiment, since the rear end of the tubular housing 4 is located above the recess 7, the suction pipe 8 is connected downward to the rear end of the tubular housing. However, as in the embodiment of FIG. An inverted L-shaped suction pipe may be connected. Further, the lower end portion of the suction pipe 8 may be projected into the inside of the recess.

In the embodiment shown in FIG. 4, the tubular housing 4 is arranged to wrap around the front and rear including the suction port 2 of the submersible pump, that is, the outer periphery of the intermediate portion.

The tubular housing 4 is composed of an upper half 4a surrounding the upper half of the middle part of the submersible pump and a lower half 4b surrounding the lower half of the submersible pump. The upper half and the lower half have bolts and nuts 18 on both side edges, respectively. The lower half part is provided with a downward suction pipe 8 in a T shape. When the upper half 4a and the lower half 4b surround the outer circumference of the middle part including the suction port 2 of the submersible pump, and the flanges of the side edges that come into contact with each other are joined by bolts and nuts 18, Each end is in close contact with the outer circumference of the submersible pump.
A packing ring 19 may be fitted and placed on a portion of the outer circumference of the submersible pump where the front and rear ends of the cylindrical housing come into close contact with each other.

The front and rear ends of the submersible pump are supported by the base 9 almost horizontally on the bottom of the tank.

Also in this embodiment, since the lower half portion 4b of the tubular housing has a downwardly extending suction pipe 8 projecting into the depression 7 at the bottom of the tank, the upper surface of the upper half portion 4a of the tubular housing is set as the safe lower limit water level. It can be done and the amount of pumped water will increase.

The water storage tank of each of the above-described embodiments is an assembly type in which the peripheral wall, the bottom wall, and the upper wall are joined to the rectangular unit plate P having the brim f at the periphery. The recess 7 in the bottom wall is formed by turning over one sheet P'of the unit plate P for the bottom plate to be used. The downward flange f and the upward flange f ′ are tightened with a bolt B and a nut N to form a watertight recess 7.

<Effect of the Invention> According to the present invention, since the suction pipe faces downward toward the recess at the bottom of the tank, the submersible pump can swirl and suck air together with water even if the water level in the tank is considerably lowered. Absent.
As a result, the amount of water that can be continuously pumped is large, and compared to the conventional water storage tank with the same amount of water, the size of the tank is smaller, which has the excellent feature of reducing the installation space. , The pit at the bottom of the tank for that purpose was obtained by reversing and assembling one unit plate for the bottom plate. The safety lower limit water level could be lowered without a special member for depression.

[Brief description of drawings]

FIG. 1 is an enlarged vertical side view of a part of the first embodiment of the present invention, FIG. 2 is a perspective view of a pedestal used in the same, and FIG. 3 is a vertical side view of the second embodiment of the present invention. FIG. 4 is a vertical side view of another embodiment of the present invention, and FIG. 5 is a front view of the tubular housing of the same. In the figure, 1 is a rod-shaped submersible pump, 2 is its suction port, 3 is a discharge pipe, 4 is a cylindrical housing, 5 is a water storage tank, 6 is its bottom, 7 is a depression, 8 is a suction pipe, P, P. ′ Is a unit plate, f,
f'indicates the tsuba.

Claims (1)

[Scope of utility model registration request] 1. A rod-shaped submersible pump having a suction port on the circumferential side,
In a pumping device for a unit panel assembly type water storage tank, wherein a cylindrical housing surrounding the suction port is horizontally placed on the bottom of the water storage tank, and water in the water storage tank is pumped by the submersible pump through a lower part of a peripheral wall of the tank. , One of the above unit plates at the bottom of the tank constructed by tightening the lower unit of the square unit plate for the bottom plate is turned over, and the unit unit of the bottom unit is tightened by tightening the upper unit of the unit unit and the lower unit of the adjacent unit plate. A pumping device for a water storage tank, characterized in that a dent is provided in the portion, and a suction pipe is provided in the tubular housing, the lower end of which approaches the dent or which projects into the dent.