JP7077434B2 - Pump system and drainage pump station - Google Patents

Description

The present invention relates to a pump system and a drainage pump station, and more particularly to a pump system and a drainage pump station using a water resistant motor integrated pump.

In recent years, due to tsunamis caused by earthquakes and storm surges caused by huge typhoons, it has become increasingly difficult to use equipment such as pumps in ordinary drainage pump stations. Therefore, there is a demand for pump equipment that can continue to operate even in the event of a disaster such as a tsunami caused by an earthquake or a storm surge caused by a huge typhoon. In order to enable continuous operation even if water infiltrates into the drainage pump station due to a tsunami or storm surge, a vertical shaft pump using a water resistant motor used for a submersible pump or the like as a driving machine for the vertical shaft pump has been proposed.

However, although the prior art has proposed a water-resistant motor integrated pump, it is also necessary to consider the operation method and control system of the pump when it is actually flooded. The applicant does not know the invention known in the literature made from such a viewpoint.

The present invention has been made in view of such problems, and an object of the present invention is to provide a pump system and a drainage pump station in consideration of the possibility that the water level of the suction water tank exceeds the planned high water level and the pump chamber is flooded. To provide.

According to one aspect of the present invention, the operating point determined according to the vertical shaft pump that guides the water in the suction water tank to the discharge water tank, the performance curve of the vertical shaft pump, and the pipeline resistance curve is within a predetermined range. A pump system including a control device for controlling the performance curve or the pipeline resistance curve based on the water level difference between the suction water tank and the discharge water tank is provided.
Even if the water level in the suction tank rises, by keeping the operating point within the specified normal range, it is possible to suppress failures due to abnormal vibration and cavitation caused by excessive flow rate operation of the vertical shaft pump.

Further, according to one aspect of the present invention, it is based on a vertical shaft pump having a pipe for guiding the water in the suction water tank to the discharge water tank, an electric discharge valve provided in the pipe, and a water level difference between the suction water tank and the discharge water tank. A pump system including a control device for controlling the opening degree of the electric discharge valve is provided.
By controlling the electric discharge valve based on the water level difference between the suction water tank and the discharge water tank, that is, the actual head, the operating point of the vertical shaft pump can be set within a predetermined normal range.

Specifically, in the control device, the operating point determined according to the performance curve of the vertical shaft pump and the pipeline resistance curve depending on the water level difference and the opening degree of the electric discharge valve is within a predetermined range. Therefore, it is preferable to control the opening degree of the electric discharge valve.

More specifically, the water level difference is a value obtained by subtracting the water level of the suction water tank from the water level of the discharge water tank, and the control device reduces the opening degree of the electric discharge valve as the water level difference becomes smaller. It is better to do it.

According to one aspect of the present invention, there is provided a vertical shaft pump that guides the water in the suction water tank to the discharge water tank, and a control device that controls the rotational speed of the vertical shaft pump based on the difference in water level between the suction water tank and the discharge water tank. A pump system is provided.
By controlling the rotation speed of the pump based on the water level difference between the suction water tank and the discharge water tank, that is, the actual head, the operating point of the vertical shaft pump can be set within a predetermined normal range.

Specifically, in the control device, the operating point determined according to the performance curve of the vertical shaft pump depending on the rotational speed of the vertical shaft pump and the pipeline resistance curve depending on the water level difference is within a predetermined range. Therefore, it is preferable to control the rotation speed of the vertical shaft pump.

More specifically, the water level difference is a value obtained by subtracting the water level of the suction water tank from the water level of the discharge water tank, and the control device reduces the rotation speed of the vertical shaft pump as the water level difference is smaller. Is good.

Further, according to one aspect of the present invention, the pump chamber, the pump that guides the water in the suction water tank to the discharge water tank, the electric valve that can discharge the water flooded in the pump chamber to the suction water tank, and the pump chamber. A drainage pump station provided with a control device for controlling the electric valve according to the flooded water level is provided.
By providing such an electric valve, when water is accumulated due to flooding of the pump chamber, the water can be discharged to the suction water tank.

The pump chamber extends in a horizontal plane and has a floor surface provided with an opening, wherein the pump is located on a pumping pipe penetrating the opening of the floor surface and a part thereof on the opening of the floor surface. It is a vertical shaft pump having a pump base for fixing the pumping pipe to the floor surface, and the electric valve may be provided in a portion of the pump base located on the opening of the floor surface. ..
In this way, an electric valve may be provided on the pump base of the vertical shaft pump so that water in the pump chamber can be discharged.

The pump chamber extends in a horizontal plane and has a floor surface provided with an opening. The pump is a vertical shaft pump penetrating the opening of the floor surface, and the electric valve is provided on the floor surface of the pump chamber. May be provided.

Alternatively, the pump chamber has a vertical surface provided with an opening, the pump is a vertical centrifugal pump having a suction pipe penetrating the opening of the vertical surface, and the electric valve is provided on the vertical surface of the pump chamber. May be provided.

According to one aspect of the present invention, the pump chamber, the pump that guides the water in the suction water tank below the pump chamber to the discharge water tank, and the pump, auxiliary equipment, and ancillary equipment caused by the inundation of the pump chamber. A drainage pump station provided with an earth leakage detector for detecting an electric leakage from such as, and an electric leakage display means for displaying a detection result by the electric leakage detector is provided.
Even if the pump room is flooded and leaks, the safety of workers can be ensured by detecting and displaying it.

According to one aspect of the present invention, a pump chamber composed of a plurality of floors, a pump for guiding water in a suction water tank below the pump chamber to a discharge water tank, and a water level meter for measuring at least a part of the water level on the plurality of floors. And a drainage pump station provided with a water level display means for displaying the measurement result by the water level gauge.
Even if the water level inundated in the pump chamber rises, the safety of workers can be ensured by measuring and displaying the water level.

The water level display means may be a multicolor indicator lamp that indicates to what floor of the plurality of floors the water has been flooded.

Even if the pump chamber is flooded, the pump can be operated and operated properly, the failure of the pump can be suppressed, and it is possible to respond flexibly when the pump is flooded. Alternatively, even if the pump chamber is flooded and the water level rises, the safety of the worker can be ensured.

The schematic block diagram which shows an example of the drainage pump station provided with the pump system 100 which concerns on 1st Embodiment. The figure which shows the relationship between the discharge amount Q of the vertical shaft pump 2 and the total head H. The graph which shows the relationship between the actual head A and the appropriate opening degree of an electric discharge valve 25. The schematic block diagram which shows an example of the drainage pump station provided with the pump system 101 which concerns on 2nd Embodiment. The figure explaining the processing operation of the control device 3. The schematic block diagram which shows an example of the drainage pump station provided with the pump system 102 which concerns on 3rd Embodiment. The figure which shows the relationship between the discharge amount Q of the vertical shaft pump 2 and the total head H. The graph which shows the relationship between the actual head A and the appropriate rotation speed of a pump spindle 22. The schematic block diagram which shows an example of the drainage pump station which concerns on 4th Embodiment. The schematic block diagram which shows an example of the drainage pump station which is a modification of FIG. The schematic block diagram which shows an example of the drainage pump station which is another modification of FIG. A block diagram schematically showing the main part of the drainage pump station. A flowchart showing an example of how to operate a drainage pump station. The schematic block diagram of the drainage pump station which concerns on 6th Embodiment.

Hereinafter, embodiments according to the present invention will be specifically described with reference to the drawings.

(First Embodiment)
FIG. 1 is a schematic configuration diagram showing an example of a drainage pump station equipped with the pump system 100 according to the first embodiment. This drainage pump station guides the water of the suction water tank 200 to the discharge water tank 300, and is composed of a pump chamber 400, a pump system 100 having a vertical shaft pump 2 and a control device 3, a suction side water level gauge 4, a discharge side water level gauge 5, and the like. Will be done.

The pump chamber 400 has a floor surface 11 and vertical faces 12, 13. The floor surface 11 extends in a horizontal plane, and the vertical shaft pump 2 penetrates the opening 11a. The lower surface side of the floor surface 11 has a suction port 213 for the vertical shaft pump 2, and the upper surface side of the floor surface 11 has a water resistant motor 23 and the like. The vertical surface 12 extends vertically upward from the floor surface 11, and has a suction water tank 200 on the outside. Further, the vertical surface 13 extends vertically above and below the floor surface 11. Between these vertical faces 12 and 13, there is a water resistant motor 23 of the vertical shaft pump 2 and the like. Hereinafter, the space partitioned by the floor surface 11 and the vertical faces 12 and 13 and having an open upper portion is referred to as a pump chamber 400.

That is, the suction water tank 200 is on the lower surface side of the floor surface 11, and the pump chamber 400 is on the upper surface side. The discharge water tank 300 is on one side (outside) of the vertical surface 13, and the pump chamber 400 is on the other side (inside).

In most cases, the planned high water level HWL (High Water Level) of the suction water tank 200 is set at a position lower than the floor surface 11. Therefore, when the water level of the suction water tank 200 is equal to or lower than the planned high water level HWL (hereinafter referred to as normal time), the water level WLi of the suction water tank 200 is lower than the water level WLo of the discharge water tank 300. However, the water level WLi of the suction tank 200 exceeds the planned high water level HWL due to a tsunami or the like, and at the same time, the water level WLo of the discharge tank 300 also rises.
For example, water may invade from the ground outside the pump field (hereinafter referred to as “abnormality”) and infiltrate the pump chamber 400.

The vertical shaft pump 2 in the pump system 100 includes a pump base 20, a pumping pipe 21, a pump main shaft 22, a water resistant motor 23, an impeller 24, and the like. In this figure, for the sake of explanation, the vertical axial flow pump is described as an example, but it is not specified and other pumps such as the vertical axial flow pump may be used.

The pump base 20 is an annular member arranged on the opening 11a of the floor surface 11, and the outer peripheral portion of the pump base 20 is fixed on the floor surface 11.

The pumping pipe 21 is fixed to the floor surface 11 by the pump base 20. The pumping pipe 21 passes through the opening of the pump base 20 and the opening 11a of the floor surface 11, the lower part is below the floor surface 11, and the upper part is above the floor surface 11. The pumping pipe 21 is composed of a pipe extending in a substantially vertical direction and a discharge curved pipe 212 connected to the pumping pipe 21. A suction port 213 facing downward is provided at the lower end of the pumping pipe 21. A part of the discharge curved pipe 212 is in the pump chamber 400 and is connected to the discharge pipe, and the discharge pipe further penetrates the vertical surface 13 and reaches the discharge water tank 300. A discharge port 214 to which a flap valve 215 is attached is provided at the tip of the discharge pipe so as to face sideways. The pump sucks up the water in the suction water tank 200 from the suction port 213 and drains it to the discharge water tank 300 via the pumping pipe 21 and the discharge curved pipe 212.

The pump spindle 22 extends substantially vertically in the pumping pipe 21. The upper part of the pump spindle 22 is connected to a motor shaft (not shown) of the water resistant motor 23. The water resistant motor 23 is located in the pump chamber 400 and rotates the pump spindle 22. The impeller 24 is fixed to the lower part of the pump spindle 22, and the impeller 24 rotates as the pump spindle 22 rotates, and water is sucked up from the suction port 213.

Further, the pump system 100 has an electric discharge valve 25. The electric discharge valve 25 is a discharge valve provided between the suction port 213 and the discharge port 214, more specifically, in the discharge pipe. The larger the opening degree of the electric discharge valve 25, the larger the flow rate and the lower the pipeline resistance. The opening degree of the electric discharge valve 25 is controlled by the control device 3. One of the features of this embodiment is the control of the electric discharge valve 25, which will be described in detail later.

The suction side water level gauge 4 is installed in the suction water tank 200, measures the water level WLi of the suction water tank 200, and transmits the measurement result to the control device 3. The discharge side water level gauge 5 is installed in the discharge water tank 300, measures the water level WLo of the discharge water tank 300, and transmits the measurement result to the control device 3. The control device 3 controls the entire vertical shaft pump 2. In particular, the control device 3 controls the opening degree of the electric discharge valve 25 based on the water levels WLi and WLo, more specifically, based on the actual head calculated from the water levels WLi and WLo, as described later. Here, the difference between the water level WLi of the suction water tank 200 and the water level WLo of the discharge water tank 300 is the actual head, that is, the actual head A = WLo-WLi.

FIG. 2 is a diagram showing the relationship between the discharge amount Q of the vertical shaft pump 2 and the total head H, and also describes the operation of the control device 3. The intersections P1 and P2 of the performance curves g and the pipeline resistance curves h1 and h2 are operating points, respectively. Here, the performance curve g is determined according to the performance of the vertical shaft pump 2. Further, the pipeline resistance curves h1 and h2 are determined by the pipeline resistance whose curve shape depends on the opening degree of the electric discharge valve 25 and the like (the pipeline resistance curves h1 and h2 assume that the electric discharge valve 25 is fully opened. The section on the vertical axis corresponds to the actual lift. That is, when the pipeline resistance is constant, the larger the actual head, the more the pipeline resistance curve translates upward. In FIG. 2, the pipeline resistance curve h1 exemplifies a normal time (actual head is positive), and the pipeline resistance curve h2 exemplifies a case where the actual head is 0.

The range of the discharge amount Q that the vertical shaft pump 2 can continuously and normally operate is Ql to Qh. For example, if the operating point exceeds the upper limit Qh, an excessive flow rate operation may occur, causing cavitation or abnormal vibration, which may lead to a failure of the vertical shaft pump 2. Therefore, the operating point in the normal state is designed to be within Ql to Qh (for example, the operating point P1).

However, when the actual head becomes 0 or negative, the operating point is outside Ql to Qh, and in particular, the upper limit Qh may be exceeded (for example, the operating point P2 when the actual head is 0). Therefore, in such a case, the control device 3 increases the line resistance by reducing the opening degree of the electric discharge valve 25 (as a result, the line resistance curve h2'), and the operating point P2'is set. Make sure that it fits within Ql to Qh.
The processing operation of the control device 3 will be described in more detail.

FIG. 3 is a graph showing the relationship between the actual head A and the appropriate opening degree of the electric discharge valve 25. The appropriate opening characteristic curve is determined according to the pump type, pump requirements, piping loss, opening characteristic of the electric discharge valve 25 itself, and the like, and is a characteristic peculiar to the drainage pump station where the vertical shaft pump 2 is installed. Specifically, the relationship between the actual head A and the proper opening degree of the electric discharge valve 25 is determined so that the operating point of the vertical shaft pump 2 is proper, and more accurately, it is within Ql to Qh. ing.

As can be seen from FIG. 2, the smaller the actual head A (the lower the intercept on the vertical axis of the pipeline resistance curve in FIG. 2), the larger the discharge amount Q. Therefore, as shown in FIG. 3, the control device 3 reduces the opening degree of the electric discharge valve 25 and increases the pipeline resistance as the actual head A is smaller.

For example, when the actual head A = A1, the control device 3 determines that the appropriate opening degree is R1%, and issues a command signal to the electric discharge valve 25 so as to be so. The same applies when the actual head is negative, and when the actual head A = A2, the control device 3 determines that the appropriate opening is R2%, and sends a command signal to the electric discharge valve 25 so as to do so. Emit.

When the actual head A is negative, that is, when the water level WLi of the suction water tank 200 is higher than the water level WLo of the discharge water tank 300, the operation of the water resistant motor 23 may be stopped and the electric discharge valve 25 may be fully opened. By doing so, the water in the suction water tank 200 is drained to the discharge water tank 300 due to the difference in water level.

As described above, in the first embodiment, the opening degree of the electric discharge valve 25 provided in the discharge pipe is controlled according to the actual head. Therefore, even when the water level of the suction water tank 200 rises, the operating point of the vertical shaft pump 2 can be kept within a predetermined range.

(Second embodiment)
The second embodiment described below is a modification of the first embodiment, and uses an electrode or an electrode band as a water level gauge. Hereinafter, the differences from the first embodiment will be mainly described.

FIG. 4 is a schematic configuration diagram showing an example of a drainage pump station equipped with the pump system 101 according to the second embodiment. The drainage pump station has suction side electrodes 41 to 43 provided at different heights in the suction water tank 200, and discharge side electrodes 51 to 53 provided at different heights in the discharge water tank 300. The number of these electrodes is not particularly limited.

The suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53 are conductive (hereinafter referred to as on) if they are immersed in water, and non-conducting (hereinafter referred to as off) if they are not immersed in water. The control device 3 can acquire on / off of the suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53. The control device 3 can determine the actual head based on the on / off states of the suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53. As an example, the suction side electrode 41 and the discharge side electrode 51 are provided at the same height, the suction side electrode 42 and the discharge side electrode 52 are provided at the same height, and the suction side electrode 43 and the discharge side electrode 53 are provided at the same height. It is provided in.

FIG. 5 is a diagram illustrating the processing operation of the control device 3. The relationship between the on / off states of the suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53, the actual head, and the opening degree of the electric discharge valve 25 is shown, and the control device 3 stores this relationship. There is. The relationship between the on / off states of the suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53 and the actual head is known depending on the installation position (height) of these electrodes. Further, the relationship with the appropriate opening degree of the electric discharge valve 25 at each actual head is predetermined.

Therefore, the control device 3 issues a command signal for adjusting the opening degree of the electric discharge valve 25 based on the on / off states of the suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53. For example, it is assumed that the suction side electrodes 41 to 43 are all on, and the discharge side electrodes 51 to 53 are on, on, and off in order. In this case, since it corresponds to "No. 1" in FIG. 5, the control device 3 determines that the appropriate opening degree is R1%, and issues a command signal to the electric discharge valve 25 so as to be so.

As described above, also in the second embodiment, the opening degree of the electric discharge valve 25 is controlled according to the actual head. Therefore, even when the water level of the suction water tank 200 rises, the operating point of the vertical shaft pump 2 can be kept within a predetermined range.

(Third embodiment)
In the first and second embodiments described above, the control device controls the opening degree of the electric discharge valve 25. On the other hand, in the third embodiment described below, the control device 3 controls the rotation speed of the water resistant motor 23. Hereinafter, the differences from the first embodiment will be mainly described.

FIG. 6 is a schematic configuration diagram showing an example of a drainage pump station equipped with the pump system 102 according to the third embodiment. The difference from FIG. 1 is that the control device 3 controls the water resistant motor 23 according to the actual head of the suction water tank 200, and controls the rotation speed of the pump. As a result, the performance curve of the vertical shaft pump 2 changes.

FIG. 7 is a diagram showing the relationship between the discharge amount Q of the vertical shaft pump 2 and the total head H, and also describes the operation of the control device 3. Similar to FIG. 2, the pipeline resistance curve h1 exemplifies the normal time, and the pipeline resistance curve h2 exemplifies the case where the actual head becomes 0. The performance curve g when the rotation speed of the pump is a specific value intersects the pipeline resistance curves h1 and h2 and the operating points P1 and P2, respectively. Therefore, the operating point P1 falls within the Ql to Qh in the normal state, but the operating point P2 exceeds the upper limit value Qh in the abnormal state.

Therefore, in such a case, the control device 3 reduces the rotation speed of the pump so that the performance curve g becomes the performance curve g'and the operating point P2'is within the Ql to Qh.

FIG. 8 is a graph showing the relationship between the actual head A and the proper rotation speed of the pump. This relationship can be considered as replacing the opening degree of the electric discharge valve 25 in FIG. 3 with the pump rotation speed, so detailed description thereof will be omitted. However, in the control device 3, the smaller the actual head A, the pump rotation speed. Is controlled to be small.

As described above, in the third embodiment, the rotation speed of the pump is controlled according to the actual head. Therefore, even when the water level of the suction water tank 200 rises, the operating point of the vertical shaft pump 2 can be kept within a predetermined appropriate range.

In this embodiment as well, as in the second embodiment, electrodes may be provided as the suction side water level gauge 4 and the discharge side water level gauge 5.

Further, in FIGS. 3 and 8, the horizontal axis may be replaced with the actual head to be the rotation speed of the water resistant motor 23.

(Fourth Embodiment)
In the first to third embodiments described above, it has been explained that water can enter the pump chamber 400. In this case, the water level in the suction water tank 200 is reduced by the operation of the pump systems 100 to 102, but the water remains accumulated on the floor surface 11 in the pump chamber 400. Then, an excessive water pressure, that is, a load acts on the floor surface 11.

Therefore, in the fourth embodiment described below, the water on the floor surface 11 can be discharged. Hereinafter, the differences from the first embodiment will be mainly described.

FIG. 9 is a schematic configuration diagram showing an example of a drainage pump station according to the fourth embodiment. This drainage pump station has an electric valve 6 for sucking water collected on the floor surface 11 and discharging it to the water tank 200, a pump room water level gauge 7 installed in the pump room 400, and a control device 8 for controlling the electric valve 6. I have.

The motorized valve 6 is, for example, a small water resistant electric valve, and is installed on the pump base 20 of the vertical shaft pump 2. More specifically, the motorized valve 6 is provided at a portion of the pump base 20 located on the opening 11a of the floor surface 11. Then, when the motorized valve 6 is opened, the water on the floor surface 11 can be sucked in and discharged to the water tank 200. The pump chamber water level gauge 7 measures the water level in the pump chamber 400 (in other words, the water level on the floor surface 11) and transmits the measurement result to the control device 8. The control device 8 controls the motorized valve 6 according to the measurement result of the pump chamber water level gauge 7. That is, when the pump chamber 400 is flooded, more accurately, when the water level in the pump chamber 400 becomes equal to or higher than a predetermined value, the control device 8 opens the motorized valve 6. As a result, the water on the floor surface 11 is drained to the suction water tank 200, the water pressure applied to the floor surface 11 is reduced, and the inundation in the pump chamber 400 is quickly eliminated.

FIG. 10 is a schematic configuration diagram showing an example of a drainage pump station, which is a modification of FIG. 9. Unlike FIG. 9, the motorized valve 6 may be installed on the floor surface 11 of the pump chamber 400.

FIG. 11 is a schematic configuration diagram showing an example of a drainage pump station, which is another modification of FIG. 9. This drainage pump station is equipped with a vertical centrifugal pump 2'instead of a vertical shaft pump, and the position of the pump chamber 400 and the location of the electric valve 6 are different.

The pump chamber 400 has vertical faces 14, 15 extending vertically from the floor surface 11. The pump chamber 400 is located on one side (15 side of the vertical surface) of the vertical surface 14, and the suction water tank 200 is located on the other side. Further, the suction pipe 21 of the vertical centrifugal pump 2'penetrates the opening of the vertical surface 14. Then, there is a suction port 213 or the like on the suction water tank 200 side of the vertical surface 14. In this embodiment, the motorized valve 6 is provided on the vertical surface 14. Then, when the pump chamber 400 is flooded, the control device 8 (not shown in FIG. 11) opens the motorized valve 6, and the water in the pump chamber 400 is drained to the suction water tank 200.

As described above, in the fourth embodiment, the motorized valve 6 is provided to discharge the water accumulated on the floor surface 11 of the pump chamber 400 to the suction water tank 200. Therefore, even if water collects in the pump chamber 400, it can be quickly removed.

(Fifth Embodiment)
The fifth embodiment described below combines the control of the motorized discharge valve 25 in the first embodiment and the control of the motorized valve 6 in the fourth embodiment to control the operation flow of the drainage pump station. It shows.

FIG. 12 is a block diagram schematically showing the main part of the drainage pump station.
As described in the first embodiment, the drainage pump station has a suction side water level gauge 4, a discharge side water level gauge 5, an electric discharge valve 25, a vertical shaft pump 2, an electric discharge valve 25 depending on the actual head, and the like. A control device 3 for controlling is provided. Further, a discharge side river flooding light 3'and an abnormally high water level operation mode light 3'may be provided, and these are turned on and off by the control device 3.

Further, as described in the fourth embodiment, the drainage pump station corresponds to the pump room water level gauge 7, the electric valve 6 that discharges the water in the pump room 400 to the suction water tank 200, and the water level in the pump room 400. It is provided with a control device 8 for controlling the motorized valve 6. Further, the pump chamber inundation lamp 8 ′ and the pump chamber inundation drainage mode lamp 8 ″ may be provided, and these are turned on and off by the control device 8.

FIG. 13 is a flowchart showing an example of an operation method of the drainage pump station. This flowchart shows an operation method when the control device 8 detects inundation of the pump chamber 400 based on the measurement result of the pump chamber water level gauge 7 (step S1).

When the inundation of the pump chamber 400 is detected, the control device 8 turns on the pump chamber inundation lamp 8'to warn of the inundation (step S2). Subsequently, based on the measurement result of the discharge side water level gauge 5, the control device 3 confirms whether or not the water level of the discharge water tank 300 is equal to or higher than the predetermined planned high water level (HWL) (step S3). When the water level of the discharge water tank 300 is equal to or higher than the planned high water level (HWL) (YES in step S3), the control device 3 turns on the discharge side river flood light 3 ″ (step S4). This is to give a notification to determine whether the pump may drain to the discharge side river.

After turning on the discharge side river flood light 3'' or when the discharge side water level is lower than the planned high water level (NO in step S3), the control device 3 is based on the measurement result of the suction side water level gauge 4. It is determined whether or not the water level of the suction water tank 200 is equal to or higher than the abnormally high water level HHWL (step S5). The abnormally high water level HHWL is set to a water level at which there is a risk of inundation in the pump chamber 400 each time. When the water level of the suction water tank 200 is higher than the abnormally high water level HHWL (YES in step S5), the suction water tank 200 is drained (after step S6), and when the water level of the suction water tank 200 is lower than the abnormally high water level HHWL (YES in step S5). In step S5 NO), drainage in the pump chamber 400 is performed (step S16 or later). Hereinafter, it will be described in detail.

When the water level of the suction water tank 200 is equal to or higher than the abnormally high water level HHWL (YES in step S5), the control device 3 turns on the abnormally high water level operation mode lamp 3 ″ (step S6). Then, the control device 3 activates the vertical shaft pump 2 (step S7). When the water level of the suction water tank 200 is equal to or higher than the predetermined planned high water level HWL (step S8), the control device 3 calculates the actual head as described in the first embodiment (step S9), and the electric discharge valve 25 The opening degree of is adjusted (step S10). More specifically, the control device 3 emits a command signal so that the electric discharge valve 25 has an appropriate opening degree, and the electric discharge valve 25 operates in response to the command signal. Then, the control device 3 detects that the electric discharge valve 25 has an appropriate opening degree. The above steps S9 and S10 are performed until the water level of the suction water tank 200 becomes lower than the planned high water level HWL.

When the water level of the suction water tank 200 becomes lower than the planned high water level HWL (NO in step S8), the control device 3 fully opens the electric discharge valve 25 (step S11). This usually drains. When the water level of the suction water tank 200 drops to a predetermined stop water level (YES in step S12), the control device 3 fully closes the electric discharge valve 25 (step S13) and stops the vertical shaft pump 2 (step S14). Further, the control device 3 turns off the abnormally high water level operation mode lamp 3'' (step S15). When the water level of the suction tank 200 rises to the planned high water level HWL or higher during normal drainage (NO in step S12, YES in step S8), the actual head is calculated again (step S9) and the electric discharge valve 25 is opened. The degree adjustment (step S10) is performed.

After stopping the vertical shaft pump 2 or when the water level of the suction water tank 200 is lower than the abnormally high water level HHWL in step S5, the pump chamber 400 is drained as follows.

First, the control device 8 turns on the pump chamber inundation / drainage mode lamp 8 ″ (step S16). Then, the control device 8 opens the motorized valve 6 (step S17). As a result, the water in the pump chamber 400 is discharged to the suction water tank 200.

When the control device 8 detects that the inundation of the pump room 400 has been eliminated based on the measurement result of the pump room water level gauge 7 (NO in step S18), the control device 8 has the pump room inundation lamp 8'and the pump room inundation drainage. The mode lamp 8'' is turned off (step S19). Further, the control device 8 fully closes the motorized valve 6 (step S20).

When the inundation of the pump chamber 400 is not eliminated (NO in step S18), the control device 3 determines whether or not the water level of the suction water tank 200 is equal to or higher than the abnormally high water level HHWL (step S21). When the water level of the suction water tank 200 becomes an abnormally high water level HHWL or higher (YES in step S21), the control device 8 turns off the pump chamber inundation / drainage mode lamp 8'' (step S22) and fully closes the motorized valve 6 (step S22). Step S23). After that, the suction water tank 200 shown in step S6 and subsequent steps is drained.

By the above operation, even when the pump chamber 400 is flooded or the suction water tank 200 exceeds the abnormally high water level HHWL, drainage can be appropriately performed.

Although the fifth embodiment illustrates the combination of the first embodiment with the fourth embodiment, the second embodiment may be combined. In this case, the electrodes 41 to 43 may be used instead of the suction side water level gauge 4 in FIG. 12, and the electrodes 51 to 53 may be used instead of the discharge side water level gauge 5. Further, a third embodiment may be combined. In this case, the rotation speed of the pump may be adjusted instead of adjusting the opening degree of the electric discharge valve 25 in step S10 of FIG.

Further, a part of FIG. 13 may be manually operated by an operator instead of being automatically controlled. For example, the operator may check the inundation status of the pump chamber 400, the status of the suction water tank 200 and the discharge water tank 300, start or stop the vertical shaft pump 2, and open / close the electric valves 6 and 25 via the operation switch. The operator may do it.

(Sixth Embodiment)
The sixth embodiment described below relates to safety management in a deep underground drainage pump station.
FIG. 14 is a schematic configuration diagram of the drainage pump station according to the sixth embodiment, and assumes a deep underground drainage pump station. When the pump 2'' (a vertical shaft pump is drawn, but the type of pump is not particularly limited) is installed deep underground, the vertical faces 12 and 13 of the pump chamber 1 reach deep underground.

The figure shows an example of four floors having a total of four floors 11a to 11d, and for convenience, they are referred to as the first basement floor to the fourth basement floor in order from the top. As described above, in the present embodiment, it is assumed that the pump room 1 of the drainage pump station is composed of a plurality of floors. And there is a suction water tank 200 below the lowest floor (floor surface 11a). A water resistant motor 23 is provided on the floor surface 11a on the 4th basement floor, and the pumping pipe 21 of the pump 2'' penetrates the floor surface 11a and is drained from the vertical surface 13 on the 4th basement floor to the discharge water tank 300. To.

Drainage is necessary in an emergency situation when the water level of the suction tank 200 rises, but unlike normal times, it is difficult to grasp the state of equipment such as the pump 2'' for drainage when the inside of the pump room 1 is flooded. There is a problem that it is difficult to ensure the safety of workers. In particular, when the pump 2 ″ is large, sufficient safety measures against electric leakage are indispensable because the output of the water resistant motor 23 is large and a high voltage power source is used.

Therefore, it is desirable that the drainage pump station in the present embodiment is provided with an earth leakage detecting means 9a and an earth leakage display means 9b. The electric leakage detecting means 9a detects an electric leakage of the pump 2 ″ (particularly, the water resistant motor 23) caused by the inundation of the pump chamber. When the earth leakage is detected, the earth leakage display means 9b displays the earth leakage and emits a warning sound to display the detection result.

Further, it is desirable that the drainage pump station is provided with a water level gauge 10a installed on each floor (or at least a part of the floors) and a water level display means 10b for displaying the water level state. Considering that the water level gauge 10a can be flooded, it is desirable that the water level gauge 10a and the water level display means 10b are connected by wire. The water level gauge 10a measures the water level of the installed floor or measures whether or not the installed floor is flooded. Then, the water level display means 10b displays the measurement result. As a specific example, the water level display means 10b is a multicolor indicator lamp, and displays how many floors the inundation water level has reached underground. Alternatively, the water level display means 10 may display how high the water is flooded from the lowest floor.

As described above, in the sixth embodiment, since the electric leakage of the pump 2 ″ and the water level in the pump chamber 1 are displayed, the safety of the operator can be ensured even when the water level of the suction water tank 200 rises.

The above-described embodiments have been described for the purpose of allowing a person having ordinary knowledge in the technical field to which the present invention belongs to carry out the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the invention is not limited to the described embodiments and should be the broadest scope in accordance with the technical ideas defined by the claims.

11, 11a to 11d Floor surface 11a Opening 12, 13, 14, 15 Vertical surface 14a Opening 2 Vertical shaft pump 20 Pump base 21 Pumping pipe 212 Discharge curved pipe 213 Suction port 214 Discharge port 215 Flap valve 22 Pump spindle 23 Water resistant motor 24 Impeller 25 Electric discharge valve 2'Vertical shaft swirl pump 2'"Pump 3 Control device 3'Discharge side river flooding light 3" Abnormally high water level operation mode light 4 Suction side water level gauge 41-43 Suction side electrode 5 Discharge side water level gauge 51 ~ 53 Discharge side electrode 6 Electric valve 7 Pump room water level gauge 8 Control device 8'Pump room flooding light 8'' Pump room flooding drainage mode light 9a Leakage detection means 9b Leakage display means 10a Water level gauge 10b Water level display means 100 to 102 Pump System 200 Suction tank 300 Discharge tank 400 Pump room

Claims (9)

A pump room with a floor and
A suction water tank separated from the pump chamber by the floor surface,
A pump that guides the water in the suction tank to the discharge tank,
An electric valve installed on a portion located above an opening provided on the floor surface for discharging water flooded into the pump chamber to the suction water tank, and an electric valve for opening and closing the opening .
A control device for controlling the opening and closing of the motorized valve according to the water level flooded in the pump chamber is provided .
A drainage pump station where the water that has flooded into the pump chamber is discharged to the suction water tank through the opening by opening the motorized valve . The floor surface extends in a horizontal plane and
The pump
A pumping pipe that penetrates the opening on the floor surface,
1. A vertical shaft pump having a pump base, part of which is located on the floor surface and part of which is located above the opening of the floor surface, and which fixes the pumping pipe to the floor surface. Drainage pump station described in. The pump is a vertical shaft pump.
A pump system including a control device for controlling the rotational speed of the vertical shaft pump or the opening degree of an electric discharge valve based on the difference in water level between the suction water tank and the discharge water tank, and the drainage pump station according to claim 2. The water level difference is a value obtained by subtracting the water level of the suction water tank from the water level of the discharge water tank.
The pump system according to claim 3 , wherein the control device reduces the rotational speed of the vertical shaft pump or the opening degree of the electric discharge valve as the water level difference becomes smaller. The suction water tank is located below the pump chamber and is located below the pump chamber.
An earth leakage detector that detects an earth leakage of the pump caused by the inundation of the pump chamber, and an earth leakage detector.
The drainage pump station according to claim 1, further comprising an earth leakage display means for displaying the detection result by the earth leakage detector. The pump room consists of multiple floors.
The suction water tank is located below the pump chamber and is located below the pump chamber.
A water level gauge that measures the water level of at least a part of the multiple floors,
The drainage pump station according to claim 1 or 5, further comprising a water level display means for displaying a measurement result by the water level gauge. The drainage pump station according to claim 6, wherein the water level display means is a multicolor indicator lamp that indicates to what floor of the plurality of floors the water has been flooded. A pump chamber with a vertical face with an opening ,
A vertical centrifugal pump that has a suction pipe that penetrates the opening facing the top and guides the water in the suction tank to the discharge tank.
An electric valve provided on the vertical surface and capable of discharging water that has flooded the pump chamber into the suction tank,
A drainage pump station provided with a control device for controlling the motorized valve according to the water level flooded in the pump chamber. A pump room with a floor and
A suction water tank separated from the pump chamber by the floor surface,
A pump that guides the water in the suction tank to the discharge tank,
An electric valve installed on a portion located above an opening provided on the floor surface for discharging water flooded into the pump chamber to the suction water tank, and an electric valve for opening and closing the opening.
A control device for controlling the opening and closing of the motorized valve according to the water level of the suction water tank is provided.
A drainage pump station where the water that has flooded into the pump chamber is discharged to the suction water tank through the opening by opening the motorized valve.

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