JPH0978679A - Suction water tank of pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the adherence and accumulation of scum at least on the bottom in a region where preliminary rotating tank is not formed of a suction water tank of pumps. SOLUTION: A first preliminary rotating tank 2 and a second preliminary rotating tank 3 inserting air inlets 1 of two pumps P1 and P2 separately in them are recessed in the bottom at a specific width interval W. A first inflow channel 13 and a second inflow channel 14 leading soil water to a pair of preliminary rotating tanks 2 and 2 are provided to the bottom and, at the same time, a fluororesin layer 18 is formed on the reinforced plastics cover surface forming the bottom surface 10 of the bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction water tank of a pump, and more particularly, to a suction water tank of a pump installed at an appropriate position of a sewage flow-down piping system connecting a sewage source to a sewage treatment plant, in which a scum is inside the water tank. The present invention relates to a suction water tank of a pump capable of preventing the residual water from accumulating on the bottom surface and accumulating on the bottom surface.

[0002]

2. Description of the Related Art Hitherto, as a suction water tank of a pump installed at a proper position of a wastewater flow-down piping system connecting a wastewater generation source and a sewage treatment plant, a technique described in JP-A-6-280300 has been proposed. As shown in FIG. 7, the suction water tank of this type of pump includes a pair of pre-swirl tanks 2 and 3 into which the suction ports 1 of the two pumps P1 and P2 are separately inserted, that is, a first pre-swirl tank 2. The second pre-swirl tank 3 is recessed at an eccentric position on one side of the bottom portion 5 of the suction water tank 4 with a predetermined width interval W, and on the other side of the first pre-swirl tank 2 and the second pre-swirl tank 3. Width direction (XX
Direction) by the first partition wall 6 protruding from the bottom surface 10 to form a pre-swirl tank forming area 7 on one side of the first partition wall 6 and a pre-swirl tank not adjacent to the other side of the first partition wall 6 The second pre-swirl tank 2 and the second pre-swirl tank 3 are divided into areas 8 and extend to the pre-swirling tank formation area 7 side in the YY direction orthogonal to the first partition wall 6 A partition wall 9 is provided on the bottom surface 10 so as to project.

Further, a first inflow port 11 is formed by cutting out the vicinity of one side of the intersection of the first partition wall 6 and the second partition wall 9, and a notch is formed at the other end of the first partition wall 6. 2nd inlet 1
2 is formed. The first inflow port 11 and one of the pre-swirl tanks 2 are provided in the bottom portion 5 of the pre-swirl tank formation area 7, and the tangent line corresponding to the rotation direction R1 of the pump P1 in which the suction port 1 is inserted in the pre-swirl tank 2 Are communicated with each other via first inflow passages 13 which are continuous in the direction, and the second inlet 12 and the other pre-swirl tank 3 are provided in the bottom portion 5 of the pre-swirl tank forming area 7 and The second inflow passage 1 connected in a tangential direction corresponding to the rotation direction R2 of the pump P2 into which the suction port 1 is inserted.
It has a structure in which they are communicated with each other through 4.

In the suction water tank of a pump having such a structure,
The two pumps P1 and P2 are operated alternately. For example, by operating the first pump P1, the dirty water in the suction water tank 4 is sucked up from the suction port 1 of the first pump P1, and after the water level of the dirty water falls below a predetermined level, It flows into the first pre-rotation tank 2 through the inflow passage 13 and is swirled up by the first pump P1 while swirling. Further, by operating the second pump P2, the dirty water in the suction water tank 4 is sucked up from the suction port 1 of the second pump P1, and after the water level of the dirty water drops below a predetermined level, It flows into the second pre-rotation tank 3 through the inflow passage 14 and is swirled up by the second pump P2 while swirling.

However, the first inflow port 11 and the second inflow port 12 are formed so as to be separated in the width direction (XX direction) of the suction water tank 4, and the first inflow port 11 and the first partition wall 6 and the first partition wall 6 are separated from each other. Since it is formed by cutting out the vicinity of one side of the intersection with the second partition wall 9, the sewage stagnation portion S is formed in the area on one side of the first inlet 11 indicated by the diagonal lines in the pre-swirling tank non-forming area 8. Occurs. As a result, the scum floating on the water surface of the stagnation part S has a drawback that it remains and accumulates on the bottom surface 10 of the pre-swirl tank non-forming area 8 after the water level of the sewage drops below the predetermined level. In addition, there is a drawback in that once it is deposited, it is extremely difficult to remove it with cleaning water.

Therefore, as shown in FIGS. 5 and 6, one end portion of the first partition wall 6 and the inner surface of the peripheral wall 4A of the suction water tank 4 and the other end portion of the first partition wall 6 and the peripheral wall 4A of the suction water tank 4 are formed. A first inlet 11 and a second inlet 12 are formed between the inner surfaces,
The inflow port 11 and the first pre-swirl tank 2 are communicated with each other via a first inflow passage 13 provided in the bottom portion 5 of the pre-swirl tank forming region 7, and the second inflow port 12 and the second pre-swirl tank are connected to each other. A suction water tank of a pump having a structure in which they are communicated with each other via a second inflow passage 14 provided in the bottom portion 5 of the formation region 7 is conceivable.

According to the suction water tank of the pump constructed as described above, the first pump P1 is operated in the state of HWL in which the water level of the dirty water in the suction water tank 4 exceeds the upper end level of the first partition wall 6.
Alternatively, by operating the second pump P2, sewage can be sucked up by the operating pump P1 or P2. In this case, the sewage swirls at high speed in the suction water tank 4 in the same direction as the rotation directions R1 and R2 of the first pump P1 and the second pump P2, and the scum floating on the surface of the sewage also rides on the swirling flow. And turn. Therefore, sewage and scum stagnation do not occur in the suction water tank 4.

The first pump P1 or the second pump P
By the operation of 2, the water level of the sewage in the suction water tank 4 is lowered to near the level WL at the upper end of the first partition wall 6, so that part of the scum floating on the surface of the sewage is operated together with the sewage. It is sucked up by the existing pump P1 or P2.

As the level of the sewage decreases from near the level WL at the upper end of the first partition wall 6 to the upper level WL of the first partition wall, the proportion of scum sucked up by the pump along with the sewage gradually increases. .

In the region where the water level of the sewage is below the level WL at the upper end of the first partition wall 6 and above the level LWL at the boundary portion 16 with the bottom surface 10 of the pre-swirl tank non-forming region 8, the sewage and scum are operated. First corresponding to the pump P1 or P2
The first pre-turning tank on the side of the pump P1 being sucked up by the pump P1 or P2 being operated through the inflow port 11 and the first inflow passage 13 or the second inflow port 12 and the second inflow passage 14 Due to the water level drop of the second pre-swirl tank 3 on the 2 or P2 side, sewage in the WL and LWL regions of the pre-swirl tank on the pump side that is not operating becomes the first inflow path 13 corresponding to the pump that is not operating. The first inflow port 11 or the second inflow passage 14 and the first inflow port 12 are reversely flown, and sucked up by the pump P1 or P2 operating through the outside of the first partition wall 6, that is, the pre-swirling tank non-forming area 8. To be Therefore, sewage and scum stagnation do not occur on the bottom surface 10 of the pre-swirl tank non-forming area 8 regardless of which pump P1 or P2 is operated, so scum remains and accumulates. Can be prevented.

However, since the scum is made to flow down depending only on the flow of the sewage, in the case of a scum having a large adhesive force, the inner surface and the bottom surface 10 of the suction water tank 4, especially the pre-swirl tank non-forming area. There is a concern that it will adhere to the bottom surface 10 of the No. 8 and be deposited.

[0012]

That is, in the suction water tank of the conventional pump, the scum floating in the water surface of the stagnation part is caused by the stagnation part of the sewage in a part of the pre-swirling tank non-forming area. It has the drawback of remaining and depositing on the bottom of the pre-swirl tank non-forming area after the water level of the sewage has dropped below the specified level, and once it is deposited, it is extremely difficult to remove it with cleaning water. There is also. Even if the slump is not generated, if the scum has a large adhesive force, there is a risk that the scum adheres to and accumulates on the inner and bottom surfaces of the suction water tank, especially the bottom surface of the pre-swirling tank non-forming area. are doing.
Therefore, in the invention according to claim 1, regardless of whether the sewage stagnation part is formed in the pre-swirling tank non-forming area or the device is devised so as not to form the stagnation part, the inner surface and the bottom surface of the suction water tank, particularly An object of the present invention is to provide a suction water tank of a pump capable of preventing scum from adhering to and depositing on the bottom surface of the pre-swirling tank non-forming area.

[0013]

In order to achieve the above-mentioned object, the invention according to claim 1 has a pair of pre-swirl tanks into which the suction ports of two pumps are inserted separately at a predetermined width interval. 1) which is provided with a groove and which guides the wastewater to the pair of pre-turning tanks.
In a suction water tank of a pump having an inflow passage and a twenty-first inflow passage provided at the bottom, a fluororesin layer is formed on at least the surface of the bottom. According to the first aspect of the present invention, the synergistic action of the water repellency of the fluororesin layer and the flow of dirty water in the suction water tank of the pump can prevent the scum from adhering and depositing on at least the bottom of the suction water tank.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described below with reference to the drawings. 1 is a plan view, and FIG. 2 is a cross section taken along the line AA in FIG. The same or corresponding parts as those of the conventional example of FIG. 7 and the comparative examples of FIGS. 1 and 2, a pair of pre-swirl tanks 2 and 3 into which the suction ports 1 of the two pumps P1 and P2 are separately inserted, that is, the first pre-swirl tank 2 and the second pre-swirl tank 3 are suction water tanks. 4 is recessed at an eccentric position on one side of the bottom portion 5 with a predetermined width interval W. On the other side of the first pre-swirl tank 2 and the second pre-swirl tank 3, the width direction (XX)
Direction) and a first partition wall 6 protruding from the bottom surface 10 to form a pre-swirl tank forming region 7 on one side of the first partition wall 6 and a pre-swirl tank not adjacent to the other side of the first partition wall 6 The second pre-swirl tank 2 and the second pre-swirl tank 3 are divided into areas 8 and extend to the pre-swirling tank formation area 7 side in the YY direction orthogonal to the first partition wall 6 A partition wall 9 is provided on the bottom surface 10 so as to project.
The upper ends of the first partition wall 6 and the second partition wall 9 are set at the same height as the boundary portion 15 between the bottom surface 10 of the pre-swirling tank non-forming area 8 and the peripheral wall 4A of the suction water tank 4.

Between the one end of the first partition wall 6 and the inner surface of the peripheral wall 4A of the suction water tank 4, and between the other end of the first partition wall 6 and the suction water tank 4.
Between the inner surface of the peripheral wall 4A of the first inlet 11 and the second inlet 1
2 are formed, and the first inlet 11 and the first pre-swirl tank 2 are formed.
Are communicated with each other through a first inflow passage 13 which is continuous in a tangential direction corresponding to the rotation direction R1 of the pump P1 into which the suction port 1 is inserted. Further, the first inflow port 12 and the first pre-swirl tank 3 communicate with each other via a second inflow passage 14 which is continuous in a tangential direction corresponding to the rotation direction R2 of the pump P2 into which the suction port 1 is inserted.

The peripheral wall 4A of the suction water tank 4 is made of concrete, and as shown in FIG. 3, a fluororesin layer 18 as a scum adhesion preventing layer is formed on its inner surface by spraying means. Further, the bottom portion 5 is also mainly composed of concrete, and as shown in FIG. 4, a bottom surface 10 is formed by covering the top surface of the concrete portion with a cover 5A made of reinforced plastic (FRP),
A fluororesin layer 18 is formed on the surface of the cover 5A as a scum adhesion preventing layer by spraying means or simultaneous molding means. In the figure, 17 is a pedestal on which the discharge bends of the pumps P1 and P2 are installed.

In the above construction, with the level of the sewage water in the suction water tank 4 in the region from HWL to HWL1 in FIG.
By operating the first pump P1 or the second pump P2, sewage can be sucked up by the operating pump P1 or P2. In this case, the sewage swirls at high speed in the suction water tank 4 in the same direction as the rotation direction R1 or R2 of the first pump P1 and the second pump P2, and the scum floating on the surface of the sewage also rides on the swirling flow. Turn. Therefore, sewage and scum stagnation do not occur in the suction water tank 4. Also, the surrounding wall 4A
Since the fluororesin layer 18 is formed on the inner surface of the above, scum can be prevented from adhering to the inner surface of the peripheral wall 4A by the synergistic action of the water repellency of the fluororesin layer 18 and the swirling flow of the dirty water.

The first pump P1 or the second pump P2
Operation causes the level of the sewage in the suction water tank 4 to reach HWL1.
To the level W of the upper ends of the first partition wall 6 and the second partition wall 9
When the scum floats near the L level, a part of the scum floating on the surface of the sewage is sucked up by the first pump P1 or the second pump P2 operating with the sewage.

As the water level of the sewage decreases from near the level WL at the upper ends of the first partition wall 6 and the second partition wall 9 to the level WL, the proportion of scum sucked up by the pump together with the sewage gradually increases. Go.

In the region where the water level of the sewage is below the level WL at the upper end of the first partition wall 6 and above the level LWL at the boundary 16 with the bottom surface 10 of the pre-swirl tank non-forming region 8, the sewage and scum are operated. First corresponding to the pump P1 or P2
The first pre-turning tank on the side of the pump P1 being sucked up by the pump P1 or P2 being operated through the inflow port 11 and the first inflow passage 13 or the second inflow port 12 and the second inflow passage 14 Due to the water level drop of the second pre-swirl tank 3 on the 2 or P2 side, sewage in the WL and LWL regions of the pre-swirl tank on the pump side that is not operating becomes the first inflow path 13 corresponding to the pump that is not operating. The first inflow port 11 or the second inflow passage 14 and the first inflow port 12 are reversely flown, and sucked up by the pump P1 or P2 operating through the outside of the first partition wall 6, that is, the pre-swirling tank non-forming area 8. To be

Therefore, no matter how much pumps P1 and P2 are operated, sewage and scum stagnation do not occur on the bottom surface 10 of the pre-swirling tank non-forming area 8, so scum remains and accumulates. Can be prevented. Moreover, since the fluororesin layer 18 is formed on the surface of the bottom surface 10 formed by the reinforced plastic cover 5A, the pre-swirl tank formation region is formed by the synergistic action of the water repellency of the fluororesin layer 18 and the flow of sewage. It is possible to prevent scum from adhering to the bottom surface 10 of the pre-swirl tank non-forming area 8 as well as the bottom surface 10 of the scum 7. Therefore, even if the scum has a large adhesive force, the scum does not adhere to and accumulate on the bottom surface 10. Further, even if the scum adheres and accumulates on the inner surface or the bottom surface 10 of the peripheral wall 4A, it can be easily removed by the cleaning water.

In the above embodiment, the fluororesin layer 18 is formed on the inner surface of the peripheral wall 4A of the suction water tank 4 and the surface of the bottom surface 10 of the bottom portion 5, respectively. However, only the surface of the bottom surface 10 is described. A structure in which the fluororesin layer 18 is formed may be used.

[0023]

As described above, according to the first aspect of the present invention, the synergistic action of the water repellency of the fluororesin layer and the flow of the dirty water in the suction water tank of the pump allows the scum of at least the bottom of the suction water tank to be formed. Adhesive deposition can be prevented. Therefore, even if the scum has a large adhesive force,
No scum will be attached and deposited on the bottom surface. Further, even if the scum adheres to and accumulates on the bottom surface, it can be easily removed by the cleaning water.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the invention according to claim 1. FIG.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged cross-sectional view showing a part of the inner surface of the peripheral wall of the suction water tank.

FIG. 4 is an enlarged cross-sectional view showing a part of a bottom portion and a bottom surface.

FIG. 5 is a plan view of a comparative example.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Pump suction port 2 1st pre-swirl tank 3 2nd pre-swirl tank 4 Pump suction water tank 5 Bottom of suction water tank 13 1st inflow path 14 2nd inflow path P1 pump P2 pump W width interval

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taro Shinesue 1-1-1, Nakanomiya Oike, Hirakata-shi, Osaka Prefecture Kubota Hirakata Manufacturing Company (72) Inventor Yasuhiro Onishi 1-1-1, Nakamiya Oike, Hirakata-shi, Osaka No. 1 in stock company Kubota Hirakata Factory (72) Inventor Koji 1-1 1-1 Nakanomiya Oike, Hirakata City, Osaka Prefecture Inside Kubota Hirakata Factory

Claims (1)

[Claims] 1. A pair of pre-swirl tanks into which the suction ports of two pumps are separately inserted are recessed at a bottom portion with a predetermined width interval. A suction water tank for a pump, wherein a 1st inflow path and a 21st inflow path are provided at the bottom, and a fluororesin layer is formed on at least the surface of said bottom.