JP2018135761A - Pump system and drainage pumping station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump system that is build while taking into consideration of an event that a pump room is flooded, and to provide a drainage pumping station.SOLUTION: A pump system includes: a vertical shaft pump for guiding water from a suction water sump to a discharge water sump; and a control device for controlling a performance curve of the vertical shaft pump or a pipe line resistance curve based on a water level difference between the suction water sump and the discharge water sump so that an operation point defined in accordance with the performance curve and the pipe line resistance curve falls within a prescribed range.SELECTED DRAWING: Figure 1

Description

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

  In recent years, due to tsunamis caused by earthquakes, storm surges caused by huge typhoons, etc., equipment such as pumps has become increasingly difficult to use due to flooding in ordinary drainage stations. Therefore, there is a demand for a pump facility that can continue operation 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 when water enters the drainage station due to a tsunami or storm surge, a vertical pump using a water-resistant electric motor used as a submersible pump or the like as a drive unit of the vertical pump has been proposed.

  However, although the prior art has proposed a water-resistant electric motor-integrated pump, it is necessary to consider the operation method and control system of the pump when it is actually submerged. In addition, the applicant does not know the literature known invention 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 station that considers the possibility that the water level of the suction tank exceeds the planned high water level and the pump chamber is submerged. Is to provide.

According to one aspect of the present invention, the vertical pump that guides the water in the suction water tank to the discharge water tank, the performance curve of the vertical pump, and the operating point determined according to the pipe resistance curve are within a predetermined range. There is provided a pump system comprising: a control device that controls the performance curve or the pipeline resistance curve based on a water level difference between the suction water tank and the discharge water tank.
Even when the water level of the suction water tank becomes high, by setting the operating point within a predetermined normal range, it is possible to suppress malfunctions due to abnormal vibration and cavitation caused by excessive flow operation of the vertical pump.

Moreover, according to one aspect of the present invention, 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 difference in water level between the suction water tank and the discharge water tank. And a control device that controls the opening degree of the electric discharge valve.
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 pump can be set within a predetermined normal range.

  Specifically, the control device has an operating point determined in accordance with a performance curve of the vertical shaft pump and a pipe resistance curve depending on the water level difference and the opening of the electric discharge valve within a predetermined range. 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 decreases the opening of the electric discharge valve as the water level difference is smaller. It is good to do.

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

  Specifically, the control device determines that the operating point determined according to the performance curve of the vertical pump depending on the rotational speed of the vertical pump and the pipe resistance curve depending on the water level difference is within a predetermined range. 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 decreases the rotational speed of the vertical pump as the water level difference is smaller. It is good.

Moreover, according to one aspect of the present invention, a pump chamber, a pump that guides the water in the suction water tank to the discharge water tank, a motor-operated valve that can discharge the water submerged in the pump chamber to the suction water tank, and the pump chamber There is provided a drainage station including a control device that controls the motor-operated valve in accordance with a flooded water level.
By providing such a motor-operated valve, when water accumulates due to the flooding of the pump chamber, the water can be discharged into the suction water tank.

The pump chamber extends in a horizontal plane and has a floor surface provided with an opening. The pump has a pumping pipe penetrating the opening in the floor surface, and a part thereof is positioned on the opening in the floor surface. And a pump base that fixes the pumping pipe to the floor surface, and the motor-operated valve may be provided in a portion of the pump base located on the floor surface opening. .
Thus, an electric valve may be provided on the pump base of the vertical shaft pump so that the 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, and the pump is a vertical shaft penetrating the opening in the floor surface, and the electric valve is disposed on the floor surface of the pump chamber. May be provided.

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

According to one aspect of the present invention, a pump chamber, a pump that guides water in a suction water tank below the pump chamber to a discharge water tank, the pump, auxiliary equipment, and auxiliary equipment resulting from the flooding of the pump chamber There is provided a drainage station including a leakage detector that detects leakage from a leakage current and the like, and a leakage display means that displays a detection result of the leakage detector.
Even if the pump chamber is flooded and the electric leakage occurs, the safety of workers is ensured by detecting and displaying this fact.

According to one aspect of the present invention, a pump chamber composed of a plurality of floors, a pump that guides water in a suction water tank below the pump chamber to a discharge water tank, and a water level meter that measures at least some of the water levels of the plurality of floors And a water level display means for displaying a measurement result by the water level gauge.
Even when the level of water immersed in the pump chamber rises, the safety of workers is ensured by measuring and displaying the level.

  The water level display means may be a multicolor indicator lamp that displays how many floors of the plurality of floors are flooded.

  Even when the pump room is submerged, it is possible to operate and operate the pump properly, to suppress the pump failure, and to respond flexibly when submerged. Alternatively, even when the pump chamber is flooded and the water level rises, the safety of workers can be ensured.

The schematic block diagram which shows an example of the drainage machine 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 lift H. FIG. The graph which shows the relationship between the actual lift A and the appropriate opening degree of the electric discharge valve 25. The schematic block diagram which shows an example of a drain machine station provided with the pump system 101 which concerns on 2nd Embodiment. The figure explaining the processing operation of the control apparatus. The schematic block diagram which shows an example of a drain machine 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 lift H. FIG. The graph which shows the relationship between the actual lift A and the appropriate rotational speed of the pump main shaft 22. FIG. The schematic block diagram which shows an example of the drainage station which concerns on 4th Embodiment. The schematic block diagram which shows an example of the drainage station which is a modification of FIG. The schematic block diagram which shows an example of the drainage machine station which is another modification of FIG. The block diagram which showed the principal part in a drainage machine station typically. The flowchart which shows an example of the operating method of a drainage station. The schematic block diagram of the drainage station which concerns on 6th Embodiment.

  Embodiments according to the present invention will be specifically described below with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram illustrating an example of a drainage station including the pump system 100 according to the first embodiment. This drainage station is for guiding the water in the suction water tank 200 to the discharge water tank 300, and is composed of a pump system 400 having a pump chamber 400, 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. Is done.

  The pump chamber 400 has a floor surface 11 and vertical surfaces 12 and 13. The floor surface 11 extends in a horizontal plane, and the vertical shaft pump 2 passes through the opening 11a. The floor surface 11 includes a suction port 213 of the vertical shaft pump 2 on the lower surface side, and the water surface motor 23 and the like on the upper surface side of the floor surface 11. The vertical surface 12 extends vertically upward from the floor surface 11, and there is a suction water tank 200 on the outside. Further, the vertical surface 13 extends vertically upward and downward from the floor surface 11. Between these vertical surfaces 12 and 13, there is a water-resistant motor 23 of the vertical shaft pump 2. Hereinafter, a space defined by the floor surface 11 and the vertical surfaces 12 and 13 and having an upper opening 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. And the discharge water tank 300 exists in the one surface side (outside) of the vertical surface 13, and the pump chamber 400 exists in the other surface 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, at the same time that the water level WLi of the suction water tank 200 exceeds the planned high water level HWL due to a tsunami or the like, the water level WLo of the discharge water tank 300 also becomes high. The pump chamber 400 may be submerged.

  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 the figure, for the sake of explanation, a vertical shaft mixed flow pump is described as an example, but it is not specified, and other pumps such as a vertical shaft axial flow pump may be used.

  The pump base 20 is an annular member disposed on the opening 11 a of the floor surface 11, and the outer periphery 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 11 a of the floor surface 11, and the lower part is below the floor surface 11 and the upper part is above the floor surface 11. The pumping pipe 21 includes a pipe extending in a substantially vertical direction and a discharge bent 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. 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 front end of the discharge pipe. The pump sucks up the water in the suction water tank 200 from the suction port 213 and drains it into the discharge water tank 300 through the pumping pipe 21 and the discharge curved pipe 212.

  The pump main shaft 22 extends in the vertical direction in the pumping pipe 21. The upper part of the pump main shaft 22 is connected to a motor shaft (not shown) of the water-resistant motor 23. The water-resistant motor 23 is in the pump chamber 400 and rotates the pump main shaft 22. An impeller 24 is fixed to the lower part of the pump main shaft 22, and the impeller 24 rotates as the pump main shaft 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 of the electric discharge valve 25, the larger the flow rate and the lower the pipe 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 meter 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 meter 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 vertical shaft pump 2 as a whole. 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 will be 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 lift H, and the operation of the control device 3 is also described. The intersections P1, P2 between the performance curve g and the pipe resistance curves h1, h2 are operating points, respectively. Here, the performance curve g is determined according to the performance of the vertical pump 2. The pipe resistance curves h1 and h2 are determined by the pipe resistance whose curve shape depends on the opening degree of the electric discharge valve 25 and the like (the pipe resistance curves h1 and h2 assume that the electric discharge valve 25 is fully opened. The vertical axis corresponds to the actual head. That is, when the pipe resistance is constant, the pipe resistance curve translates upward as the actual lift is larger. In FIG. 2, the pipe resistance curve h <b> 1 illustrates the normal time (actual lift is positive), and the pipe resistance curve h <b> 2 illustrates the case where the actual lift is zero.

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

However, when the actual head becomes 0 or negative, the operating point is outside Ql to Qh, and may exceed the upper limit Qh in particular (for example, the operating point P2 when the actual head is 0). Therefore, in such a case, the control device 3 increases the pipe resistance by reducing the opening of the electric discharge valve 25 (resulting in a pipe resistance curve h2 ′), and the operating point P2 ′ is Q1 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 lift 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 characteristics of the electric discharge valve 25 itself, and the like, and is a characteristic peculiar to the drainage station where the vertical shaft pump 2 is installed. Specifically, the relationship between the actual lift A and the appropriate opening degree of the electric discharge valve 25 is determined so that the operating point of the vertical shaft pump 2 is accurate, so that it is within the above Ql to Qh. ing.

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

  For example, when the actual lift 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 to the case where the actual lift is negative. When the actual lift A = A2, the control device 3 determines that the proper opening is R2%, and sends a command signal to the electric discharge valve 25 so as to be so. To 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 in this way, the water in the suction water tank 200 is drained to the discharge water tank 300 by a water level difference.

  Thus, in 1st Embodiment, the opening degree of the electric discharge valve 25 provided in discharge piping is controlled according to an 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 set within a predetermined range.

(Second Embodiment)
The second embodiment to be described next is a modification of the first embodiment, and uses an electrode or an electrode strip as a water level gauge. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 4 is a schematic configuration diagram illustrating an example of a drainage station including the pump system 101 according to the second embodiment. The drainage 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”) when immersed in water, and are non-conductive (hereinafter referred to as “off”) when not immersed. The control device 3 can acquire ON / OFF of the suction side electrodes 41 to 43 and the discharge side electrodes 51 to 53. Based on the on / off states 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. 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 the same height. Is provided.

  FIG. 5 is a diagram for explaining 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 lift, and the opening degree of the electric discharge valve 25 is shown. The control device 3 stores this relationship. Yes. 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 lift is known from the installation positions (heights) of these electrodes. Moreover, the relationship with the appropriate opening degree of the electric discharge valve 25 in each actual lift is determined in advance.

  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 sequentially on, on, and off. 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.

  Thus, also in 2nd Embodiment, the opening degree of the electric discharge valve 25 is controlled according to an 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 set 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 rotational speed of the water-resistant motor 23. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 6 is a schematic configuration diagram illustrating an example of a drainage station including the pump system 102 according to the third embodiment. As a difference from FIG. 1, the control device 3 controls the water-resistant motor 23 according to the actual head of the suction water tank 200 and controls the rotational 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 lift H, and also illustrates the operation of the control device 3. Similarly to FIG. 2, the pipe resistance curve h1 illustrates the normal time, and the pipe resistance curve h2 illustrates the case where the actual lift is zero. The performance curve g when the rotational speed of the pump is a specific value intersects the pipe resistance curves h1 and h2 and the operating points P1 and P2, respectively. Therefore, the operating point P1 falls within the above Ql to Qh in the normal time, but the operating point P2 exceeds the upper limit value Qh in the abnormal time.

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

  FIG. 8 is a graph showing the relationship between the actual head A and the appropriate rotational speed of the pump. Since this relationship can be considered as replacing the opening of the electric discharge valve 25 in FIG. 3 with the pump rotation speed, a detailed description thereof will be omitted. However, the control apparatus 3 determines that the pump rotation speed is smaller as the actual lift A is smaller. Is controlled to be small.

  Thus, in 3rd Embodiment, the rotational speed of a pump is controlled according to an actual head. Therefore, even when the water level of the suction water tank 200 rises, the operating point of the vertical pump 2 can be set within a predetermined appropriate range.

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

  3 and 8, the horizontal axis may be the rotational speed of the water-resistant motor 23 instead of the actual head.

(Fourth embodiment)
In the first to third embodiments described above, it has been described that water can enter the pump chamber 400. In this case, the water level in the suction water tank 200 decreases due to the operation of the pump systems 100 to 102, but water remains 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, water on the floor surface 11 can be discharged. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 9 is a schematic configuration diagram illustrating an example of a drainage station according to the fourth embodiment. The drainage station includes an electric valve 6 that discharges water accumulated on the floor surface 11 to the suction water tank 200, a pump chamber water level meter 7 installed in the pump chamber 400, and a control device 8 that controls the electric valve 6. I have.

  The motor-operated valve 6 is a small water-resistant motor-operated valve, for example, and is installed on the pump base 20 of the vertical shaft pump 2. More specifically, the motor-operated valve 6 is provided in a portion of the pump base 20 located on the opening 11a of the floor 11. And the water on the floor surface 11 can be discharged | emitted to the suction water tank 200 because the motor operated valve 6 will be in an open state. The pump chamber water level meter 7 measures the water level in the pump chamber 400 (in other words, the water level on the floor 11) and transmits the measurement result to the control device 8. The control device 8 controls the motor-operated valve 6 according to the measurement result of the pump chamber water level meter 7. That is, when the pump chamber 400 is submerged, more precisely, when the water level in the pump chamber 400 becomes a predetermined value or more, the control device 8 opens the motor-operated valve 6. Thereby, 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 water in the pump chamber 400 is quickly eliminated.

  FIG. 10 is a schematic configuration diagram illustrating an example of a drainage station that is a modification of FIG. 9. Unlike FIG. 9, the motor-operated valve 6 may be installed on the floor surface 11 of the pump chamber 400.

  FIG. 11 is a schematic configuration diagram illustrating an example of a drainage station that is another modified example of FIG. 9. This drainage station is provided with a vertical spiral pump 2 'instead of a vertical pump, and the position of the pump chamber 400 and the location of the motor-operated valve 6 are different.

  The pump chamber 400 has vertical surfaces 14 and 15 extending from the floor surface 11 in the vertical direction. The pump chamber 400 is on one surface side (vertical surface 15 side) of the vertical surface 14, and the suction water tank 200 is on the other surface side. Further, the suction pipe 21 of the vertical shaft centrifugal pump 2 ′ passes through the opening of the vertical surface 14. A suction port 213 is provided on the vertical surface 14 on the suction water tank 200 side. In this embodiment, the motor-operated valve 6 is provided on the vertical surface 14. When the pump chamber 400 is submerged, the control device 8 (not shown in FIG. 11) opens the motor-operated valve 6 and the water in the pump chamber 400 is drained into the suction water tank 200.

  As described above, in the fourth embodiment, the motor-operated valve 6 is provided to discharge water accumulated on the floor surface 11 of the pump chamber 400 to the suction water tank 200. Therefore, even when water accumulates in the pump chamber 400, early removal is possible.

(Fifth embodiment)
The fifth embodiment to be described next is a combination of the control of the electric discharge valve 25 in the first embodiment and the control of the electric valve 6 in the fourth embodiment. It is shown.

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

  In addition, as described in the fourth embodiment, the drainage station is configured according to the pump chamber water level meter 7, the electric valve 6 that discharges the water in the pump chamber 400 to the suction water tank 200, and the water level in the pump chamber 400. And a control device 8 for controlling the motor-operated valve 6. Further, a pump chamber submersible lamp 8 ′ and a pump chamber submerged drain mode light 8 ″ may be provided, and these are turned on / off by the control device 8.

  FIG. 13 is a flowchart illustrating an example of a method for operating the drainage station. This flowchart shows an operation method in the case where the control device 8 detects the flooding of the pump chamber 400 based on the measurement result of the pump chamber water level meter 7 (step S1).

  When inundation of the pump chamber 400 is detected, the control device 8 turns on the pump chamber submersion lamp 8 'so as to warn about this (step S2). Subsequently, based on the measurement result of the discharge-side water level meter 5, the control device 3 checks whether or not the water level in the discharge water tank 300 is equal to or higher than a predetermined planned high water level (HWL) (step S3). When the water level in 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 flooding light 3 ″ (Step S4). This is a notification for determining whether the pump may drain into the discharge river.

  After the discharge-side river flood light 3 ″ is turned on 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 meter 4 It is determined whether or not the water level in the suction water tank 200 is equal to or higher than the abnormal high water level HHWL (step S5). Note that the abnormally high water level HHWL is set each time a water level that may cause water intrusion into the pump chamber 400. When the water level of the suction water tank 200 is equal to or higher than the abnormal high water level HHWL (YES in step S5), the suction water tank 200 is drained (after step S6), and the water level of the suction water tank 200 is less than the abnormal high water level HHWL ( In step S5 NO), the pump chamber 400 is drained (after step S16). Details will be described below.

  When the water level in the suction water tank 200 is equal to or higher than the abnormal high water level HHWL (YES in step S5), the control device 3 turns on the abnormal high water level operation mode lamp 3 ″ (step S6). And the control apparatus 3 starts 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. Is adjusted (step S10). More specifically, the control device 3 issues a command signal so that the electric discharge valve 25 has an appropriate opening, and the electric discharge valve 25 opens (or closes) accordingly. And the control apparatus 3 detects that the electric discharge valve 25 became an appropriate opening degree. The above steps S9 and S10 are performed until the water level in the suction water tank 200 becomes less than the planned high water level HWL.

  When the water level of the suction water tank 200 becomes less than the planned high water level HWL (NO in step S8), the control device 3 fully opens the electric discharge valve 25 (step S11). Thereby, normal drainage is performed. When the water level of the suction water tank 200 decreases 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 pump 2 (step S14). Further, the control device 3 turns off the abnormal high water level operation mode lamp 3 '' (step S15). When the water level of the suction water tank 200 rises and exceeds the planned high water level HWL 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 pump 2 or when the water level of the suction water tank 200 is less than the abnormal 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 submerged drain mode lamp 8 '' (step S16). And the control apparatus 8 opens the motor operated valve 6 (step S17). Thereby, the water in the pump chamber 400 is discharged into the suction water tank 200.

  When the control device 8 detects that the pump chamber 400 has been submerged based on the measurement result of the pump chamber water level meter 7 (NO in step S18), the controller 8 detects the pump chamber submersible lamp 8 ′ and the pump chamber submersible drainage. The mode lamp 8 '' is turned off (step S19). Furthermore, the control device 8 fully closes the motor-operated valve 6 (step S20).

  When the flooding of the pump chamber 400 is not eliminated (NO in step S18), the control device 3 determines whether or not the water level in the suction water tank 200 is equal to or higher than the abnormal high water level HHWL (step S21). When the water level in the suction water tank 200 becomes equal to or higher than the abnormally high water level HHWL (YES in Step S21), the control device 8 turns off the pump chamber submerged drainage mode lamp 8 '' (Step S22) and fully closes the motor-operated valve 6 (Step S22). Step S23). Thereafter, the suction water tank 200 is drained after step S6.

  By the above operation, even when the pump chamber 400 is submerged or the suction water tank 200 exceeds the abnormal high water level HHWL, the water can be appropriately drained.

  In the fifth embodiment, the combination of the first embodiment and the fourth embodiment is exemplified, but 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 of FIG. 12, and the electrodes 51 to 53 may be used instead of the discharge side water level gauge 5. Further, the third embodiment may be combined. In this case, the rotation speed of the pump may be adjusted instead of adjusting the opening of the electric discharge valve 25 in step S10 of FIG.

  Further, a part of FIG. 13 may be a manual operation by an operator instead of automatic control. For example, the operator may confirm the inundation status of the pump chamber 400 and the status of the suction water tank 200 and the discharge water tank 300, and start and stop of the vertical shaft pump 2 and opening and closing of the motorized valves 6 and 25 via the operation switch. May be performed by an operator.

(Sixth embodiment)
The sixth embodiment to be described next relates to safety management in a deep underground drainage station.
FIG. 14: is a schematic block diagram of the drainage machine station which concerns on 6th Embodiment, and assumes the deep underground drainage machine 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 surfaces 12 and 13 of the pump chamber 1 reach deep underground.

  The figure shows an example in which there are four floors of a total of four floor surfaces 11a to 11d, which are referred to as the first basement floor to the fourth basement floor in order from the top for convenience. Thus, in this embodiment, it is assumed that the pump chamber 1 of the drainage station is composed of a plurality of floors. And there exists the 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 fourth floor, and the pumping pipe 21 of the pump 2 ″ passes through the floor surface 11a and is drained from the vertical surface 13 on the fourth floor to the discharge water tank 300. The

  Drainage in an emergency situation where the water level of the suction tank 200 has risen is necessary, but unlike normal times, it is difficult to grasp the state of equipment such as the pump 2 '' for drainage when the pump chamber 1 is submerged, 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 leakage are indispensable because the output of the water-resistant motor 23 is large and a high-voltage power supply is used.

  Therefore, it is desirable that the drainage station in the present embodiment includes the leakage detection means 9a and the leakage display means 9b. The leakage detecting means 9a detects a leakage of the pump 2 ″ (particularly, the water resistant motor 23) due to the flooding of the pump chamber. When the electric leakage is detected, the electric leakage display means 9b displays the detection result by displaying that fact or generating a warning sound.

  Further, the drainage station is preferably provided with a water level meter 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. In consideration of the possibility that the water level meter 10a can be submerged, it is desirable that the water level meter 10a and the water level display means 10b are connected by wire. The water level meter 10a measures the water level of the installed floor, or measures whether the floor has been submerged. And the water level display means 10b displays a measurement result. As a specific example, the water level display means 10b is a multicolor indicator lamp, and displays how many underground floors the flooded water level has reached. Alternatively, the water level display means 10 may display how much water is flooded from the lowest floor.

  Thus, in the sixth embodiment, since the 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 embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement 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. Therefore, the present invention should not be limited to the described embodiments, but should be the widest scope according to the technical idea 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 main shaft 23 Water resistant motor 24 Impeller 25 Electric discharge valve 2 ′ Vertical vortex pump 2 ″ Pump 3 Control device 3 ′ Discharge side river flooding light 3 ″ Abnormal high water level operation mode light 4 Suction side water level gauges 41 to 43 Suction side electrode 5 Suction side water level gauge 51 ˜53 Discharge side electrode 6 Motorized valve 7 Pump chamber water level meter 8 Controller 8 ′ Pump chamber submerged light 8 ”Pump chamber submerged drain mode light 9a Leakage detection means 9b Leakage display means 10a Water level indicator 10b Water level indicator means 100 to 102 Pump System 200 Suction water tank 300 Discharge water tank 400 Pump room

Claims (14)

A vertical pump that guides the water in the suction tank to the discharge tank;
The performance curve or the pipe resistance curve based on the water level difference between the suction water tank and the discharge water tank so that the operating point determined according to the performance curve of the vertical pump and the pipe resistance curve is within a predetermined range. And a control system for controlling the pump system. A vertical shaft pump having a pipe for guiding the water of the suction tank to the discharge tank;
An electric discharge valve provided in the pipe;
A control system comprising: a control device that controls an opening degree of the electric discharge valve based on a water level difference between the suction water tank and the discharge water tank.   The control device is configured so that an operating point determined according to a performance curve of the vertical pump and a pipe resistance curve depending on the water level difference and the opening of the electric discharge valve is within a predetermined range. The pump system according to claim 2, wherein the opening degree of the valve is controlled. 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 said control apparatus is a pump system of Claim 2 or 3 which makes the opening degree of the said electric discharge valve small, so that the said water level difference is small. A vertical pump that guides the water in the suction tank to the discharge tank;
A control system comprising: a control device that controls a rotation speed of the vertical shaft pump based on a difference in water level between the suction water tank and the discharge water tank.   The control device is configured so that an operating point determined according to a performance curve of the vertical pump depending on a rotation speed of the vertical pump and a pipe resistance curve depending on the water level difference is within a predetermined range. 6. The pump system according to claim 5, which controls the rotational speed of the pump. 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 said control apparatus is a pump system of Claim 5 or 6 which makes the rotational speed of the said vertical shaft pump small, so that the said water level difference is small. A pump room,
A pump for guiding the water in the suction tank to the discharge tank;
An electric valve capable of discharging the water immersed in the pump chamber to the suction water tank;
And a control device that controls the motor-operated valve according to a water level immersed in the pump chamber. The pump chamber extends in a horizontal plane and has a floor surface provided with openings;
The pump is
A pumping pipe penetrating through the opening of the floor surface;
A vertical shaft pump having a pump base partly located on the floor surface, partly located on an opening in the floor surface, and fixing the pumping pipe to the floor surface;
The drainage station according to claim 8, wherein the motor-operated valve is provided in a portion of the pump base located on the floor surface opening. The pump chamber extends in a horizontal plane and has a floor surface provided with openings;
The pump is a vertical shaft pump that penetrates the opening of the floor surface,
The drainage station according to claim 8, wherein the motor-operated valve is provided on a floor surface of the pump chamber. The pump chamber has a vertical surface provided with an opening,
The pump is a vertical spiral pump having a suction pipe that passes through the opening of the vertical surface,
The drainage station according to claim 8, wherein the motor-operated valve is provided on a vertical surface of the pump chamber. A pump room,
A pump that guides the water in the suction tank below the pump chamber to the discharge tank;
A leakage detector that detects leakage of the pump due to the pump chamber being submerged, and
A drainage station comprising: a leakage display means for displaying a detection result by the leakage detector. A pump room consisting of multiple floors,
A pump that guides the water in the suction tank below the pump chamber to the discharge tank;
A water level meter for measuring the water level of at least a part of the plurality of floors;
And a water level display means for displaying a measurement result obtained by the water level gauge.   The drainage station according to claim 13, wherein the water level display means is a multicolor indicator lamp that displays how many of the plurality of floors are flooded.