JP3008332B2 - Pump suction water tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to minimize the retention of suspended matter such as scum when pumping sewage, drainage, sewage, etc. of a water tank provided with a plurality of pumps which are individually operated. The present invention relates to a suction water tank of a pump devised in the following.

[0002]

2. Description of the Related Art As a suction water tank of a pump installed for pumping sewage in the middle of a sewage pipe, two pre-swirling tanks in which suction ports of pumps are individually provided are provided in the bottom of the water tank in a concave shape. This is suggested by JP-A-3-84136 and JP-A-6-280300.

FIG. 4 shows the one suggested by Japanese Patent Application Laid-Open No. 3-84136. The first and second two pre-swirl tanks 1, which are provided in a concave shape alongside two places on the bottom surface of the water tank H such as manholes and pits,
The first partition walls 3 and 4 are provided around 2 and a second partition wall 5 that partitions the formation area of the two pre-rotation tanks 1 and 2 is provided.
A first inflow passage 7 extending from a first inlet 6 formed between the first partition wall 3 and the second partition wall 5 on one side is provided in the first pre-swirl tank 1 in a tangential direction along the rotation direction R1 of the pump. To communicate with
Further, a second inflow passage 9 extending from a second inlet 8 formed between the first partition wall 4 and the second partition wall 5 on the other side is connected to the second pre-swirl tank 2 in the rotation direction R2 of the pump. They are connected in a tangential direction along them.

FIG. 5 shows one suggested by Japanese Patent Application Laid-Open No. 6-280300. In this case as well, between the first and second two pre-swirl tanks 1 and 2 provided in a concave shape alongside two places on the bottom surface of the water tank H composed of manholes and a water storage area (storage tank). A first partition wall 19 is provided, and a second partition wall 11 for defining an area for forming the two pre-swirling tanks 1 and 2 is provided. The first partition wall 11 is connected to the first pre-swirling tank 1 in a tangential direction along the rotation direction of the pump. A second portion (inlet) 13 of the inflow path 12 is provided at the center of the first partition wall 19 and connected to the second pre-swirl tank 2 in a tangential direction along the rotation direction of the pump.
The beginning (inflow port) of the inflow path 14 is provided near the end of the first partition wall 19.

By the way, in the suction water tank of the conventional pump as described with reference to FIGS. 4 and 5, two pumps separately provided corresponding to the first pre-swirl tank 1 and the second pre-swirl tank 2 are used. Generally, it is operated alternatively. Then, when any of the pumps, for example, the pump corresponding to the first pre-swirling tank 1 is operated when the water level of the sewage in the water tank H is equal to or lower than a predetermined height, the sewage is supplied to the first inflow path 7, The wastewater flows into the first pre-swirl tank 1 through the swirl 12 and swirls. By such swirling, sewage entrains suspended matters such as scum and is pumped up by a pump. When the pump corresponding to the second pre-swirl tank 2 is operated, the sewage flows into the second pre-swirl tank 2 through the second inflow passages 9 and 14 and swirls. And is pumped up by a pump.

[0006]

In the conventional example described with reference to FIG. 4, both the first inlet 6 and the second inlet 8 are provided with a water tank H.
Near the center of the second partition wall 5. Therefore, when the water level of the sewage is lower than the height of the first partition walls 3 and 4 and the second partition wall 5, the pump corresponding to the first pre-rotation tank 1 or the second pre-rotation tank 2 When operating individually and pumping suspended matter such as scum,
Even when the water level is located above the bottom surface B of the water tank H, it is surrounded by the hatched area in FIG. 4, that is, the water tank wall H1 and the first partition walls 3 and 4 forming the water tank H. In the region on the bottom surface B, the flow F of the sewage flowing through the bottom surface B and flowing into the first inlet 6 or the second inlet 8 is less likely to be formed, or no flow is formed. If an area in which the flow of sewage is difficult to form or is not formed is called a dead water area Z, when the water level falls below the bottom surface B and reaches the first inflow path 7 or the second inflow path 8, In the dead water zone Z, the first pre-swirl tank 1 or the second
Suspended matter such as scum that does not flow into the pre-swirling tank 2 remains.

In the conventional example described with reference to FIG. 5, since the starting portion 13 corresponding to the inflow port of the first inflow path 12 is located near the center of the water tank H, the dead water region Z is formed by the second inflow port 14. The water tank wall H1 and the first partition wall 19 on the opposite side of the starting portion 15
Are formed in the region on the bottom surface B surrounded by
With the operation of the pump corresponding to the pre-swirling tank 1, the flow of sewage flowing from the bottom surface B through the first inlet 12 to the first pre-swirling tank 1 is hardly formed in the dead water region Z, or is completely formed. In some cases, suspended matter such as scum remains in the dead water area Z.

The present invention has been made in view of the above circumstances, and the inside of a water tank is divided into a double tank formation area in which two pre-swirl tanks are formed and a water storage area in which no pre-swirl tank is formed. The water level can be reduced by taking measures to create a wide range of water flow in the reservoir area from the upper level of the bottom of the tank to the lower level by the operation of the pump. An object is to prevent floating substances such as scum from remaining in a water storage area when the water drops below the bottom of a water tank.

[0009]

The invention according to claim 1 is
In the suction tank of the pump provided with the first and second two pre-swirling tanks in which the suction ports of the pumps having the same rotation direction are individually provided on the bottom surface of the water tank, On the bottom
A first partition wall dividing the bottom of the water tank into a double tank forming area in which two pre-swirl tanks are formed and a water storage area in which no pre-swirl tank is formed; Second divided into two single-tank formation areas each having a pre-swirling tank
A partition wall is formed in a T-shape and provided in the water storage area.
The bottom of the water tank to which it belongs is formed with a downward slope toward the double tank formation area
Is, the reservoir area, the first pre-swirl extending out from the first inlet port formed between one end curved portion and the water tank wall of the first partition wall
Having a downward slope toward the first pre-rotation tank Ri tangentially along the rotational direction of the pump which corresponds to the vessel Tsurana the first pre-rotation chamber
It is connected to the first pre-swirling tank by a smoothly curved first inflow path, and extends from a second inlet formed between the other end curved portion of the first partition wall and the water tank wall to form a second inlet . Two
Have a downward slope toward the second pre-rotation tank Ri Tsurana the second pre-rotation chamber tangentially along the rotational direction of the pump which corresponds to the turning reservoir
Is communicated to the second pre-rotation chamber by a second inflow channel bent smoothly to, it is characterized in.

In the case of such a suction water tank of a pump, when the water level of the water tank is lower than the height of the first partition wall and higher than the bottom surface of the water tank, the first pre-swirl tank becomes if the corresponding pump is operated is due to its operation, savings
While the sewage in the water area flows into the first inflow passage through the first inflow port formed between the one end curved portion of the first partition wall and the water tank wall, the first pre-swirl tank side lowers the water level, The wastewater on the side of the second pre-swirling tank exits the second inflow path of the second pre-swirling tank, passes through the water storage area outside the first partition wall, flows into the first inflow path through the first inflow port. Furthermore, when the pump corresponding to the second pre-swirling tank is operated, the second water in which the sewage in the water storage area is formed between the other end curved portion of the first partition wall and the water tank wall with the operation. While flowing into the second inflow channel through the inflow port, the water level on the second pre-swirling tank side decreases, and the sewage on the first pre-swirling tank side exits the first inflow channel of the first pre-swirling tank to form the first partition. Water storage outside the wall
Through the zone and into the second inflow channel through the second inlet.
Therefore, regardless of which one of the two pumps corresponding to each pre-swirling tank is operated, the flow of sewage occurs in a wide range over the entire bottom surface of the water storage area, eliminating the dead water area described above, Even if suspended matter such as scum accumulates on the bottom surface of the water tank, such suspended matter is washed away by the flow of such sewage, flows into the first pre-swirl tank or the second pre-swirl tank together with the sewage, and is pumped up by the pump.

[0011] Te suction aquarium smell of the pump configured as above, first inflow path and the second inflow path, they
Since it has a downward slope toward the pre-rotation tank continuous, this
The first pre-swirl tank and the second
2 The momentum of the sewage flowing into the pre-swirl tank and swirling becomes stronger,
The effect of involving suspended matter such as scum in sewage is noticeable.
Be conducted .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view showing one embodiment of a suction water tank of a pump according to the present invention, and FIG.
FIG. 2 is a cross-sectional view taken along a line corresponding to line II-II of FIG.

In this embodiment, the water tank H is formed by concrete pits or manholes into which water such as sewage, gray water or sewage flows. At two locations deviated to one of the bottom surfaces B of the water tank H, a small first pre-swirl tank 1 and a second pre-swirl tank 2 having a concave shape are provided.
In each of the two pre-swirl tanks 1 and 2, suction ports V1 and V2 of individual pumps P are provided.

A first partition wall 21 and a second partition wall 21 are provided on the bottom B of the water tank H.
A partition wall 22 is provided in a T-shape. The first partition wall 21 is formed by dividing the bottom of the water tank H into two pre-rotation tanks 1 and 2.
Are formed into a double tank formation area A in which water is formed and a water storage area C in which no pre-swirling tank is formed. The bottom surface B belonging to the water storage area C has a downward slope toward the double tank formation area A.

A first inlet 31 is formed between the smoothly curved one end 21a of the first partition wall 21 and the tank wall H1, and the other smoothly curved other end of the first partition wall 21 is provided. A second inflow port 32 is formed between 21b and the tank wall H1. The second partition wall 22 divides the double-tank formation area A into two single-tank formation areas A1 and A2 in which the pre-rotation tanks 1 and 2 are formed one by one. Each single tank formation area A
The bottom surface B belonging to 1 and A2 has a downward gradient toward the first pre-swirl tank 1 or the second pre-swirl tank 2.

[0016] Then, extending from the first inflow port 31, the first
The water storage area C is communicated with the first pre-swirl tank 1 by a smoothly curved first inflow path 41 connected to the first pre-swirl tank 1 in a tangential direction along the rotation direction of the pump P corresponding to the pre-swirl tank 1. ing. The second pre-out extending from the second inlet 32
The water storage area C is communicated with the second pre-swirl tank 2 by a smoothly curved second inflow path 42 connected to the second pre- swirl tank 2 in a tangential direction along the rotation direction of the pump P corresponding to the swirl tank 2. I have.

In FIGS. 1 and 2, 51, 5
Reference numeral 2 denotes a pedestal that supports the discharge bend 100 of the pump P.

In the suction tank of the pump configured as described above, when the level of the sewage in the water tank H is higher than the bottom B of the water storage area C and lower than the height of the first partition wall 21. For example, when the pump P corresponding to the first pre-swirling tank 1 is operated to suck up the sewage in the first pre-swirling tank 1 from the suction port V1, the first inflow from the water storage area C through the first inflow port 31 is performed. The sewage flowing into the first pre-swirling tank 1 via the road 41 is
On the bottom surface B of the water storage area C, a flow in contact with the water tank wall H1 and the first partition wall 21 is formed. Therefore, the dead water area described above between the first inlet side portion of the first partition wall 21 and the water tank wall H1. Is not formed. Therefore, suspended matter such as scum accumulated on the bottom surface B of the water storage area C is washed away by the flow, and is pumped up together with the sewage from the suction port V1 of the pump.

The same operation is performed when the pump corresponding to the second pre-swirling tank 2 is operated to draw up the waste water in the second pre-swirling tank 2 from the suction port V2. That is, when the level of the sewage in the water tank H is higher than the bottom surface B of the water storage area C and lower than the height of the first partition wall 21, the pump corresponding to the second pre-swirl tank 2 is operated. When the sewage in the second pre-swirling tank 2 is sucked up from the suction port V2, the water from the water storage area C passes through the second inflow port 32 through the second inflow path 42, and the second
The sewage flowing into the pre-swirling tank 2 is on the bottom B of the water storage area C,
Since the flow in contact with the water tank wall H1 and the first partition wall 21 is formed, the dead water area described above is not formed between the second inlet side portion of the first partition wall 21 and the water tank wall H1. Suspended matter such as scum accumulated on the bottom surface B is washed away by the flow, and is pumped up together with the sewage from a suction port V2 of the pump.

Further, the first inlet channel 41 and the second inflow path 42 described above has a downward <br/> slope towards the pre-rotation tanks 1 and 2 which they continuous. Therefore, these first inflow paths 41
And the swirling sewage flowing into the first pre-swirl tank 1 and the second pre-swirl tank 2 through the second inflow passage 42 becomes strong, and the action of involving suspended matter such as scum in the sewage becomes remarkable. Since it is exhibited, there is an advantage that the suspended matter can be effectively collected by pumping.

The first inflow channel 41 and the second inflow channel 42 are shown in FIG.
May be horizontal as shown in FIG. Also according to this, the first inlet 31 and the second inlet 32 are connected to the first pre-swirl tank 1 and the second pre-swirl tank 2 so that the pump rotation directions R1, R
2 are connected in a tangential direction along the first pre-swirl tank 1
In the second pre-swirl tank 2, a swirling flow of the sewage is generated, and the effect of involving suspended matter such as scum in the sewage is sufficiently exhibited.

In FIG. 1, reference numeral 61 denotes a communication passage which connects the first pre-swirl tank 1 and the second pre-swirl tank 2 near their bottoms. The communication passage 61 is useful for guiding wastewater and suspended matter remaining in the other pre-swirl tank to the one pre-swirl tank when the wastewater is being pumped from one pre-swirl tank.

[0023]

According to the present invention, since the water flow is formed in a wide range over the entire water storage area defined at the bottom of the water tank, the dead water area is not generated as in the prior art, and the water is deposited on the bottom of the water tank. Suspended matter such as scum is washed away by the water flow into the pre-swirling tank. For this reason, an effect is obtained in that suspended matter hardly remains in the water tank.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment for implementing a suction water tank of a pump according to the present invention.

FIG. 2 is a cross-sectional view taken along a line corresponding to line II-II in FIG.

FIG. 3 is a sectional view showing another embodiment corresponding to FIG. 2;

FIG. 4 is a plan view of a conventional example.

FIG. 5 is a plan view of another conventional example.

[Explanation of symbols]

 A Double tank formation area A1, A2 Single tank formation area B Bottom C Water storage area H Water tank H1 Water tank wall P Pump V1, V2 Suction port 1 First pre-rotation tank 2 Second pre-rotation tank 21 First partition wall 21a First partition One end of wall 21b The other end of first partition 22 Second partition 31 First inlet 32 Second inlet 41 First inflow channel 42 Second inflow channel R1, R2 Pump rotation direction

Continued on the front page (72) Inventor Taro Shinesue 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Inside Kubota Hirakata Factory Co., Ltd. (72) Inventor Masaaki Matsuda 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Shares (56) References JP-A-3-84136 (JP, A) JP-A-6-280300 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04B 1 / 00-23/14 E03F 5/22 F04D 29/44

Claims (1)

(57) [Claims] 1. A suction tank for a pump in which first and second two pre-swirling tanks are provided in a recessed manner, wherein suction ports of pumps having the same rotation direction are separately provided on a bottom surface of the water tank. A first partition wall for dividing the bottom of the water tank into a double tank forming area in which two pre-swirl tanks are formed and a water storage area in which no pre-swirl tank is formed; To two single tank formation areas where one pre-swirling tank is formed.
A second partition wall for partitioning is provided in a T-shape, and the bottom surface of the water tank belonging to the water storage area is located below the double tank formation area.
And the water storage area extends from a first inflow port formed between the one end curved portion of the first partition wall and the water tank wall to face the first pre-swirl tank.
Smooth with a downward slope toward the first pre-rotation tank Ri Tsurana the first pre-rotation chamber tangentially along the rotational direction of the response to the pump
The first inflow path is connected to the first pre-swirl tank by a curved first inflow path, and extends from a second inflow port formed between the other end curved portion of the first partition wall and the water tank wall to form a second inflow path . Pre-swirling tank
Smooth with a down slope toward the second pre-rotation tank Ri Tsurana the second pre-rotation chamber tangentially along the rotation direction of the corresponding pump
A suction water tank for a pump, wherein the suction water tank is communicated with the second pre-swirling tank by a second curved inflow path.