JPH0979197A - Partition wall of pump water absorbing tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid vibration and a noise, in its turn, occurrence of a pumping cutoff condition by restraining the occurrence of separation in an inlet in width directional both side wall side suction waterways of a pump water absorbing tank as well as to reduce a residual water quantity of the pump water absorbing tank by lowering the pumpable lowest water level up to a low level. SOLUTION: A position on the tip of a second partition wall 8 arranged in suction waterways R2 and R3 is displaced by L1 to the downstream side more than a position on the tip of a first partition wall 2, and a position on the tip of first partition walls 1 and 3 is displaced by L2 to the downstream side more than a position on the tip of the second partition wall 8 arranged in the suction waterways R2 and R3. A position on the tip of the second partition wall 8 arranged in suction waterways R1 and R4 is displaced by L3 to the downstream side more than a position on the tip of the first partition walls 1 and 3. Therefore, inlet waterway widths w4 and w5 in the suction waterways R1, R2, R3 and R4 are enlarged, and occurrence of separation in an inlet of the width directional both side wall side suction waterways R1 and R4 is restrained.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a partition wall of a pump water absorption tank.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, for example, four pumps P1, P2, P3, P4 are installed and a plurality of partition walls 1 functioning as a supporting member for supporting a ceiling portion 4. , 2, 3 are provided, the pumps P1, P2,
Independent suction water channels R1, R2, R corresponding to P3, P4
In the conventional pump water absorption tank 5 in which R3 and R4 are formed, generally, the cross-sectional shape of the upstream end of each partition wall 1, 2 and 3 is formed into a substantially semi-circular shape so that the center of the partition walls 1, 2 and 3 is The structure is formed symmetrically with the line C as the axis of symmetry.

By the way, in this type of pump water absorption tank 5,
The width dimension W1 is set to be larger than the width dimension W2 of the water channel 6 on the upstream side, so that the water channel 6 has a planar shape that extends to both sides in the width direction. Therefore, the water that has flowed into the water absorption tank 5 from the water channel 6 on the upstream side is indicated by the arrow X1 with respect to the suction water channels R2 and R3 in the central portion.
Enter straight as shown in. However, the suction water passages R1 and R4 on both sides enter obliquely as shown by arrows X2 and X2. Such an approach form becomes more remarkable as the flow velocity is higher.

As described above, in the approach mode in which the suction water passages R1 and R4 on both sides are obliquely entered, the partition walls 1 and 3 which are deviated to the widthwise both side walls 5A and 5B side of the pump water absorption tank 5.
Since the flow to the upstream end of the partition wall is slanted as shown by the arrows X2 and X2, the flow does not follow the partition walls 1 and 3 at the upstream end parts of the partition walls 1 and 3, and the arrow x2 in FIG. As shown by, the flow away from the partition walls 1 and 3, that is, “peeling” occurs, and a vortex flow indicated by an arrow x3 is generated in the stagnation portion between the cutting wall x2 and the upstream end of the partition walls 1 and 3 to cause pressure. And lowers the water surface locally. Moreover, since the tips of the partition walls 1, 2 and 3 are aligned at the same position, the water channel width w1 between the partition wall 2 and both side walls 5A and 5B of the water absorption tank 5 is narrowed by the thickness t of the partition walls 1 and 3. Therefore, the flow velocity suddenly changes and increases at the inlets of the suction water passages R1, R2, R3, and R4. In particular, the suction water channels R on both sides in the width direction in which the flow with respect to the upstream ends of the partition walls 1 and 3 are inclined.
In 1 and R4, peeling occurs and eddy currents are easily generated, which locally lowers the water surface, causes a waving state of the water surface, causes air suction, and causes vibration and noise in the pump, May be in a pumped-off state.

Due to the generation of the vortex flow x3 in the stagnation portion, as shown by the solid line in FIG.
When 1 is formed, a ridge portion Y2 that rises is formed immediately downstream of the valley portion Y1, and a valley portion Y3 is formed immediately downstream of the mountain portion Y2, so that the water surface is in a wavy state.

Even if the water surface becomes wavy, it does not have any adverse effect when the water level in the pump water absorption tank 5 is relatively high as shown by the solid line. However, if the water surface is wavy at the low water level as shown by the phantom line, the pumps P1, P
4 has a possibility that the air E will be sucked in, and when the suction of the air E causes the pumps P1 and P4 to have harmful effects such as vibration and noise, when the suction amount of the air E becomes large, the idling state (pumping There is also a risk of becoming a cutoff state. Therefore, the lowest level of water that can be pumped must be set to a relatively high level, which has the drawback that the amount of residual water in the pump water absorption tank 5 increases. Moreover, if the flow velocity is increased, the aforementioned peeling is likely to occur.

On the other hand, as shown in FIG. 6, the ceiling portion 4 (see FIG.
In order to increase the support strength of each suction water passage R1, R
A pump water absorption tank in which the second partition wall 8 that divides 2, R3 and R4 into two, for example, in the width direction is provided, and the tips of the first partition walls 1, 2, 3 and the second partition wall 8 are aligned at the same position. 5 is known. However, in the pump water absorption tank 5 of this type, since the inlet water passage width w2 in each of the suction water passages R1, R2, R3, R4 is narrowed by the thickness t of the second partition wall 8, each suction water passage R1, At the inlets of R2, R3 and R4, the flow velocity suddenly changes and becomes high. In particular, in the suction water channels R1 and R4 on both sides in the width direction in which the flow with respect to the upstream end portions of the first partition walls 1 and 3 and the second partition wall 8 is oblique, peeling is likely to occur and swirl is likely to occur, and the water surface is locally localized. And may cause air to be sucked in as a cause of a waved state on the water surface, which may cause vibration and noise in the pump, which may eventually lead to a pumping cutoff state.

[0008]

[Problems to be Solved by the Invention] That is, in the conventional partition wall of the pump water absorption tank, since the tip of the partition wall is set to a predetermined position, the water channel width at the inlet of each suction water channel becomes narrow and The flow velocity suddenly changes and becomes high at the entrance of the waterway. Therefore, in particular, at the inlets of the suction water channels on both sides in the width direction where the flow with respect to the upstream end of the partition wall becomes slanted, it becomes easy to generate a vortex and generate a vortex, locally lowering the water surface,
It may cause the water to undulate, causing air to be sucked in, causing vibration and noise in the pump, which may result in a pumping interruption, so set the minimum pumpable water level to a relatively high level. It must be set, and the amount of water remaining in the pump water absorption tank will increase accordingly. Therefore, the invention according to claim 1 suppresses the occurrence of peeling at the inlet of the suction water passage on both side walls in the width direction of the pump water absorption tank, thereby avoiding the occurrence of vibration and noise, and eventually the pumping cutoff state, and pumping water. It is an object of the present invention to provide a partition wall of a pump water absorption tank capable of reducing the minimum possible water level to a low level and reducing the amount of residual water in the pump water absorption tank.

[0009]

In order to achieve the above object, the invention according to claim 1 forms an independent suction water passage corresponding to each pump of a pump water absorption tank in which three or more pumps are installed. In the partition wall of the pump water absorption tank provided with a plurality of partition walls, to the downstream side as the position of the tip of the partition wall is moved from the widthwise central portion of the pump water absorption tank to the widthwise both side walls It is characterized by being displaced. According to the invention described in claim 1, since the water channel width of the inlet of each suction water channel becomes large, it is possible to prevent the flow velocity from suddenly increasing at the inlet of each suction water channel. As a result, it is possible to suppress the occurrence of peeling at the inlet of the suction water passage on both side walls in the width direction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described below with reference to the drawings. FIG. 1 is a cross-sectional plan view of a pump water absorption tank. It should be noted that the same or corresponding parts as those of the conventional pump water absorption tank described with reference to FIGS. In FIG. 1, four pumps P1, P2, P3, P4 are installed in a pump water absorption tank 5, and a plurality of partition walls 1 functioning as a supporting member for supporting a ceiling portion 4 (see FIG. 4). , 2, 3, independent suction water passages R1, R2, R3, R4 are formed corresponding to the pumps P1, P2, P3, P4.

The positions of the tips of the partition walls 1, 2 and 3 are
From the widthwise central portion of the pump water absorption tank 5 to the widthwise side walls 5A,
It is displaced downstream as it moves to the 5B side.
Specifically, the positions of the tips of the partition walls 1 and 3 are displaced from the positions of the tips of the partition wall 2 by L1 downstream.

With such a structure, the water flowing into the water absorption tank 5 from the water channel 6 on the upstream side in FIG. 1 goes straight into the suction water channels R2 and R3 in the central portion as shown by the arrow X1. . On the other hand, the suction water passages R1 and R4 on both sides enter diagonally as shown by arrows X2 and X2, and such an entry form becomes more remarkable as the flow velocity is higher.

However, since the positions of the tips of the partition walls 1, 2 and 3 are displaced to the downstream side by L1 from the position of the tip of the partition wall 2, both side walls 5A and 5B of the partition wall 2 and the water absorption tank 5 are arranged. Since the water channel width w3 between them becomes larger than the conventional water channel width w1 (see FIG. 3), it is possible to prevent the flow velocity from suddenly increasing at the inlets of the suction water channels R1, R2, R3, R4. As a result, the suction water channels R1, on both side walls in the width direction,
Since the generation of peeling at the inlet of R4 can be suppressed, the vortex shown by the arrow x3 in FIG. 5 does not occur and the water surface is not locally lowered. As a result, it is possible to avoid the occurrence of inconvenience caused by the fact that the water surface becomes wavy and the air E is sucked into the pumps P1 and P4.
In other words, it is possible to avoid the occurrence of inconvenience that causes vibration, noise, and the like, and eventually leads to a state of cutoff of pumping. As a result, it becomes possible to reduce the minimum level of water that can be pumped to a low level and reduce the amount of residual water in the pump water absorption tank.

FIG. 2 is a cross-sectional plan view showing another embodiment of the invention described in claim 1, in which the pump water absorption tank 5 is
The pumps P1, P2, P3, P4 of the table are installed, and by providing a plurality of first partition walls 1, 2, 3 having a function as a supporting member for supporting the ceiling portion 4 (see FIG. 4), Independent suction water passages R1, R2, R3, R4 are formed corresponding to the pumps P1, P2, P3, P4. further,
In order to increase the support strength of the ceiling portion 4 (see FIG. 4), a second partition wall 8 that divides each of the suction water passages R1, R2, R3, R4 into two in the width direction is provided.

The positions of the tips of the first partition walls 1, 2 and 3 and the second partition wall 8 are downstream as they move from the widthwise central portion of the pump water absorption tank 5 to the widthwise side walls 5A and 5B. It is displaced to the side. Specifically, the position of the tip of the second partition wall 8 provided in the suction water passages R2, R3 is displaced downstream from the position of the tip of the first partition wall 2 by L1, and the first partition wall 1, 3 The second position where the tip position is provided in the suction water passages R2, R3
The second partition wall 8 provided on the suction water passages R1 and R4 while being displaced to the downstream side by L2 from the position of the tip of the partition wall 8
The position of the tip of the first partition wall 1, 3 than the position of the tip of the
It is displaced to the downstream side by 3.

With such a structure, the water flowing into the water absorption tank 5 from the water channel 6 on the upstream side in FIG. 2 enters straight into the suction water channels R2, R3 in the central portion as shown by the arrow X1. . On the other hand, the suction water passages R1 and R4 on both sides enter diagonally as shown by arrows X2 and X2, and such an entry form becomes more remarkable as the flow velocity is higher.

However, each suction water passage R1, R2, R3, R
The waterway width of the inlet in 4 is, as shown by w4 and w5,
Since it is larger than the conventional inlet water passage width w2 (see FIG. 6), it is possible to prevent the flow velocity from suddenly increasing at the inlets of the suction water passages R1, R2, R3, R4. As a result, peeling at the inlet of the suction water passages R1 and R4 on both side walls in the width direction, that is, the upstream end portion of the first partition walls 1 and 3 and the upstream end portion of the second partition wall 8 provided in the suction water passages R1 and R4. Since it is possible to suppress the occurrence of peeling in the above, it is not possible to locally lower the water surface by generating the vortex shown by the arrow x3 in FIG. As a result, it is possible to avoid the occurrence of inconvenience caused by the fact that the water surface becomes wavy and the air E is sucked into the pumps P1 and P4. In other words, it is possible to avoid the occurrence of inconvenience that causes vibration, noise, and the like, and eventually leads to a state of cutoff of pumping. As a result, it becomes possible to reduce the minimum level of water that can be pumped to a low level and reduce the amount of residual water in the pump water absorption tank.

In the above embodiment, the four pumps P1,
P2, P3, P4 are installed and each pump P1, P2, P
Independent suction channels R1, R2, R corresponding to P3 and P4
The pump water absorption tank 5 provided with the three partition walls 1, 3 forming R3, R4 has been described, but the invention described in the claims corresponds to three or more pumps and these pumps. It can also be applied to a pump water absorption tank 5 provided with a partition wall capable of forming three or more independent suction water passages.

Further, four pumps P1, P2, P3, P
4 independent suction water channels R1, R2, R3, R4
Are provided with three first partition walls 1, 2, 3 and one second partition wall 8 is provided for each suction water passage R1, R2, R3, R4.
Although the pump water absorption tank 5 provided with is explained, the invention described in the claims is a partition wall capable of forming three or more pumps and three or more independent suction water channels corresponding to these pumps. Is provided and each suction water channel is provided with one second partition wall 8, or three or more pump water absorption tanks, and three or more independent suction water channels corresponding to these pumps are formed. A pump water absorption tank 5 in which a partition wall that can be formed is provided and two or more second partition walls 8 are provided in each suction water passage
Can also be applied to.

[0020]

As described above, according to the first aspect of the invention, the width of the inlet of each suction water channel becomes large, so that it is possible to prevent the flow velocity from suddenly increasing at the inlet of each suction water channel. it can. As a result, the occurrence of peeling at the inlet of the suction water passage on both side walls in the width direction is suppressed. Therefore, unlike the conventional case, the eddy current is not generated to locally lower the water surface. As a result, it is possible to avoid the inconvenience caused by the fact that the water surface becomes wavy and the air is sucked into the pump. In other words, it is possible to avoid the occurrence of inconvenience that causes vibration and noise, which eventually leads to the state of pumping interruption, so it is possible to reduce the minimum water level that can be pumped to a low level and reduce the residual water volume in the pump water absorption tank. It will be possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view showing another embodiment of the present invention.

FIG. 3 is a cross-sectional plan view showing a conventional pump water absorption tank.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is an enlarged explanatory diagram showing flow separation.

FIG. 6 is a cross-sectional plan view showing a conventional pump water absorption tank corresponding to the present invention.

[Explanation of symbols]

 1 1st partition wall (partition wall) 2 1st partition wall (partition wall) 3 1st partition wall (partition wall) 5 Pump water absorption tank 5A Pump water absorption tank width direction side wall side 5B Pump water absorption tank width direction etc. Side wall side 8 Second partition wall (partition wall) P1 pump P2 pump P3 pump P4 pump R1 suction water channel R2 suction water channel R3 suction water channel R4 suction water channel

Claims (1)

[Claims] 1. A partition wall of a pump water absorption tank in which a plurality of partition walls are provided in order to form an independent suction water passage corresponding to each pump of the pump water absorption tank in which three or more pumps are installed, A partition wall for a pump water absorption tank, wherein the position of the tip of the partition wall is displaced to the downstream side as it moves from the central portion in the width direction of the pump water absorption tank to both side walls in the width direction.