JPH1161972A - Pumping station having function for separating solid foreign matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of the abrasion of an impeller and a casing or pump clogging due to capture to a screen of solid foreign matters having high specific gravity and suction into a pump. SOLUTION: A screen 6, in which a first opening 6A is formed to a bottom section, is installed at the upstream place of a suction water tank 2. A flexible tunnel 11 is extended in overall width in the cross direction at the height level H of the first opening 6A extending over a section in the vicinity of the upstream of the place of the installation of a pump 3 from the place of the installation of the screen 6, and a plurality of roll-shaped vertical moving members 12 elongated in the cross direction and lifted and lowered by lifting devices 13 are abutted against the top face of the ceiling 11A of the tunnel 11 at regular intervals L in the longitudinal direction. A solid foreign-matter shifter 10 is composed of a plurality of the vertical moving members 12, 12,... and the flexible tunnel 11 while a solid foreign-matter collecting pit 15 communicated through a second opening 14 formed to the bottom section of the downstream wall 2A of the suction water tank 2 is constructed on the downstream side of the suction water tank 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump station having a function of separating solid foreign matters.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, in a sewage drainage pump station in which a pump 3 (for example, a vertical axis pump) is installed in a suction water tank 2 constructed downstream of an inflow water channel 1, the sewage is drained. Pump 3 contains solid matter of high specific gravity
In order to prevent the abrasion of the impeller 4 and the casing 5 or the clogging of the pump caused by being sucked into the screen, a screen 6 is installed at a position upstream of the suction water tank 2 so that solid foreign substances mixed into the sewage and flowing down the inflow water channel 1 are removed. They are collected by the screen 6.

[0003] As a result, solid substances having a low specific gravity flowing down the water surface and a shallow area near the water surface and collected by the screen 6 can be relatively easily removed from the screen 6 before the screen 6 is clogged. Can be. However, the screen 6 flows down the bottom and the deep area near the bottom.
It is difficult to remove the solid foreign matter having a high specific gravity collected from the screen 6 after the collection, and the amount of the collected foreign matter increases, and the clogging of the screen 6 proceeds.

When the clogging of the screen 6 proceeds in this manner, the amount of water flowing down to the suction water tank 2 is suppressed, and the water level of the suction water tank 2 is increased even though the water level of the inflow water channel 1 is increased. It drops to the stop water level. For this reason,
Although it is necessary to continue the operation of the pump 3 and continue the drainage, there is a problem that the pump 3 is automatically stopped. Therefore, it is necessary to frequently and repeatedly perform a difficult operation for removing the collected solid foreign matter having a high specific gravity from the screen 6.

Therefore, the impeller 4 of the pump 3 and the guide blade 7
A pump configured to reduce the number of sheets of A or to devise these shapes so as to be able to drain water in a state where solid foreign matters are mixed is employed.

However, even if this type of pump is employed, it is not possible to prevent the impeller 4 and the casing 5 from being worn or clogged by the solid foreign matter having a high specific gravity. Also,
When the pump is clogged, an excessive reaction force is applied to a prime mover (not shown) via the main shaft 7 or abnormal vibration occurs in the pump 3. In each case, the operation of the pump 3 is stopped to There is an annoyance that it is necessary to remove the high-specific-gravity solid foreign matter that is biting into the vehicle 4. In the figure,
Reference numeral 8 denotes a drain pipe 8 and 9 denotes a suction bell mouth.

[0007]

That is, in a conventional pumping station, it is necessary to frequently and repeatedly perform a difficult operation of removing high-specific-gravity solid foreign matters collected by the screen from the screen. When you do not need to work,
High specific gravity solid foreign matter causes wear on the impeller or casing or clogging of the pump.The pump must be stopped when the pump is clogged, and the high specific gravity solid matter caught in the impeller must be removed. There is.

Accordingly, the present invention is provided with a solid foreign matter separating function capable of preventing a solid matter having a high specific gravity from being collected on a screen or being sucked into a pump to cause wear of an impeller or a casing or clogging of a pump. It aims to provide a pumping station.

[0009]

In order to achieve the above object, a pump station having a function of separating solid foreign matter according to the present invention is provided with a suction water tank connected to the downstream of an inflow water channel, and the suction water tank is constructed. In a pumping station where a pump is installed, a screen provided with a first opening at the bottom is installed at an upstream position of the pump, and a stream of water flows from the installation position of the screen to near the upstream of the installation position of the pump. A flexible tunnel capable of water is extended in a width direction at a height level of the first opening, and extends vertically in an upper surface of a ceiling of the tunnel, and a vertically moving member which is raised and lowered by a lifting device is attached to the tunnel. A plurality of the vertically moving members and the flexible tunnel constitute a solid foreign matter transfer device at a predetermined interval in the longitudinal direction, and a solid foreign matter transfer device is provided. It is characterized in that to construct the solid foreign matters integrated mass which communicates via a second opening provided in the bottom of the downstream wall of the suction write aquarium flow side.

According to the present invention, solid substances having a low specific gravity flowing down the water surface of the inflow water channel and the suction water tank and a shallow region near the water surface are collected on the screen. On the other hand, solid foreign matter having a high specific gravity flowing down the inflow channel and the bottom of the suction water tank and a deep area near the bottom flows into the flexible tunnel of the solid foreign matter transfer device from the first opening. The ceiling of the tunnel moves up and down locally following a plurality of up and down moving members which are moved up and down by the operation of the elevating device. The space between the ceiling and the bottom of the tunnel is increased by the lowering of the vertical moving member and the flow velocity is increased, and the space between the ceiling and the bottom of the tunnel is increased by the raising of the vertical moving member. It is repeated at predetermined intervals in the longitudinal direction of the tunnel. That is,
Inside the flexible tunnel of the solid foreign matter transfer device, a pulsating flow in which the flow velocity fluctuates at predetermined intervals in the longitudinal direction is generated, and the solid foreign matter having a high specific gravity flowing into the tunnel is mixed with the flow of water in the tunnel and the pulsating flow. Transfer to the downstream side in cooperation with. The high-specific-gravity solid foreign matter transferred to the downstream side flows into the foreign matter accumulation mass from the second opening and is accumulated.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional side view, FIG. 2 is a plan view of a foreign matter transfer device, and FIG. 3 is a sectional view taken along line AA of FIG. The same or equivalent parts as those in the conventional example of FIG.
The description is given with the same reference numerals. 1 and 2,
Suction water tank 2 constructed to communicate downstream of inflow water channel 1
A casing 5 rotatably accommodating the impeller 4 fixed to the main shaft 7, a drain pipe 8 connected to a downstream side of the casing 5, and a vertical shaft having a suction bell mouth 9 mounted on an upstream side of the casing 5. A mixed flow pump 3 is provided.

A screen 6 having a first opening 6A at the bottom is installed at an upstream position of the suction water tank 2, and a solid foreign matter transfer device 10 is installed from the installation position of the screen 6 to the vicinity near the upstream of the installation position of the pump 3. Is done. The solid foreign matter transfer device 10 includes a flexible tunnel 11, a plurality of roll-shaped vertical moving members 12, 12,...

The flexible tunnel 11 is formed of rubber or synthetic resin and has an upstream end at the screen 6.
And has a height level H of the first opening 6A and extends substantially the entire width of the suction water tank 2. Are provided in the ceiling 11A at appropriate intervals in the longitudinal direction and the width direction. The flexible tunnel 11 floats in the form of a stream when water flows down the inflow channel 1 and the suction tank 2.

A plurality of roll-shaped vertical moving members 12, 1
.. Extend in the width direction on the upper surface of the ceiling 11A and are in contact with the longitudinal direction at an appropriate interval L. Also, both ends in the axial direction of the vertical moving members 12, 12,... Are connected to an elevating device 13 constituted by, for example, a cylinder device, and are configured to move up and down by a stroke amount described later by the operation of the elevating device 13.

On the other hand, on the downstream side of the suction water tank 2, a solid foreign matter accumulation mass 15 which is communicated through a second opening 14 provided at the bottom of the downstream wall 2A of the suction water tank 2 is constructed. The lower end level of the suction bell mouth 9 in the pump 3 is set slightly higher than the lower end level of the suction bell mouth 9 in the conventional pump 3. Control means 1
The switching valve 17 is switched and controlled by a switching signal output from the controller 6 to switch the direction of the high-pressure fluid supplied from the high-pressure fluid supply source 18 to the lifting device 13 so that the lifting device 13 operates. .

In the above-described configuration, while the pump 3 is operating, solid substances having a low specific gravity flowing down the water surface of the inflow water channel 1 and the suction water tank 2 and a shallow region near the water surface are collected on the screen 6. On the other hand, the solid foreign matter having a high specific gravity flowing down the deep portion near the bottom and the bottom of the inflow water channel 1 and the suction water tank 2 is as follows:
The liquid flows into the flexible tunnel 11 of the solid foreign matter transfer device 10 from the first opening 6A provided at the bottom of the screen 6.

The flexible tunnel 11 floats in the form of a stream by the water flow generated by the operation of the pump 3. A switching signal is output from the control means 16 to the switching valve 17, so that the lifting device 14 When the lifting device 13 is operated by switching the direction of the high-pressure fluid supplied to the vertical movement of the plurality of vertical moving members 12, 12,... By the stroke amount S shown in FIG. The ceiling 11A in the flexible tunnel 11 moves locally up and down. When the vertically moving member 12 descends to the position shown by the two-dot chain line, the distance between the ceiling 11A and the tunnel bottom 11B becomes small and the flow velocity increases, and when the vertically moving member 12 rises to the position shown by the solid line, the ceiling 11 The state in which the distance between the air and the tunnel bottom 11B is increased and the flow velocity is reduced is repeated at every longitudinal distance L inside the flexible tunnel 11.

That is, inside the flexible tunnel 11 of the solid foreign matter transfer device 10, a pulsating flow whose flow velocity fluctuates at intervals L in the longitudinal direction is generated, and the solid foreign matter having a high specific gravity flowing into the tunnel 11 is tunneled. 11 cooperates with the flow of the water and the pulsating flow to transfer the water downstream. The solid foreign matter having a high specific gravity transferred to the downstream side flows into the foreign matter accumulation mass 15 from the second opening 14 and is accumulated. Solid matter having a high specific gravity accumulated in the foreign matter accumulation mass 15 may be periodically collected.

As described above, solid foreign matter having a high specific gravity is collected on the screen 6 or sucked into the pump 3 to be impeller 4
It is possible to prevent wear of the casing 5 and clogging of the pump. Accordingly, the solid foreign matter having a high specific gravity, which has been produced in the conventional pumping station, is screened.
This eliminates the need for difficult work to remove from the pump, and also eliminates wear of the impeller 4 and the casing 5 and clogging of the pump 3 due to solid foreign matter having a high specific gravity.

In the above embodiment, one flexible tunnel 11 is used. However, as shown in FIG. 5, a plurality of rubber or synthetic resin hoses 11X, 11X... May constitute the flexible tunnel 11.

[0021]

As described above, according to the present invention, a solid foreign matter having a high specific gravity flowing down a deep region is introduced into a solid foreign matter transfer device from a first opening, and the foreign matter is passed through the second opening by the solid foreign matter transfer device. Since the solid foreign matter can be collected after being accumulated in the accumulation mass, it is possible to prevent solid foreign matter having a high specific gravity from being collected by the screen or being sucked into the pump to cause wear of the impeller or the casing or clogging of the pump. Therefore, it is not necessary to perform the difficult operation of removing the high-specific-gravity solid foreign matter from the screen, which has been performed in the conventional pumping station, and it is possible to eliminate the wear of the impeller and the casing or the clogging of the pump due to the high-specific gravity solid foreign matter. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of a foreign matter transfer device.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram of an operation state of the solid foreign matter transfer device.

FIG. 5 is a sectional view corresponding to FIG. 4, showing another embodiment of the flexible tunnel.

FIG. 6 is a longitudinal sectional side view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inflow water channel 2 Suction water tank 2A Downstream wall of suction water tank 3 Pump 6 Screen 6A 1st opening 10 Solid foreign substance transfer device 11 Flexible tunnel 12 Vertical moving member 13 Lifting device 14 2nd opening 15 Solid foreign substance accumulation mass H 1st Opening height level L Longitudinal spacing

Claims (1)

[Claims] 1. A suction tank is constructed in communication with a downstream of an inflow water channel, and a pump station having a pump installed in the suction tank is provided with a screen provided with a first opening at the bottom at a position upstream of the pump, From the installation position of the screen to the vicinity near the upstream of the installation position of the pump, a flexible tunnel capable of flowing water in a stream of water by a water flow is extended in the width direction at the height level of the first opening. A plurality of vertically moving members extending in the width direction on the upper surface of the ceiling and moving up and down by a lifting device are brought into real contact with a plurality of vertical moving members at predetermined intervals in the longitudinal direction of the tunnel, and the plurality of vertically moving members and the flexible A solid foreign matter transfer device is constituted by the tunnel, and a solid foreign matter accumulation mass communicating with the downstream side of the suction water tank through a second opening provided at the bottom of the downstream wall of the suction water tank is constructed. A pumping station equipped with a solid foreign matter separating function.